E150/ L PFI Bronco & "F" Series E250/350, F250/350 & "F" Super Duty

1 of 57 12/12/2014 11:46 AM E4OD ELECTRONIC CONTROLS 1992 Ford Pickup 7.3L Eng F350 APPLICATION E4OD APPLICATIONS Models Engine E150/250 4.9L PFI Bronco & "F" Series "E" Series Bronco & "F" Series E250/350, F250/350 & "F" Super Duty E250/350, F250/350 & "F" Super Duty 4.9-5.0L PFI 5.8L PFI 5.8L PFI 7.3L Diesel 7.5L PFI DESCRIPTION & OPERATION Tip: E4OD STARTS OUT IN HIGH GEAR FIXED WITH A PIECE OF WIRE..WITH PICTURES The center of the EEC-IV system is the Electronic Control Assembly (ECA). The ECA receives information from various sensors and switches. Based on information received, the ECA generates output signals to control engine and transmission operation. The EEC-IV system controls 3 major areas of engine operation: air/fuel mixture, ignition, and emission control. In addition. the system controls A/C compressor clutch operation, idle speed, and transmission solenoids. The system has self-diagnostic capabilities. The engine control system consists of the ECA, sensors, switches, and solenoids. In order for the ECA to perform properly, it must be kept constantly informed of engine operating conditions. It is the task of the engine sensors to supply the ECA, via electrical signals, with specific information required to determine engine operating conditions. The ECA will then send out electrical signals to control air/fuel ratio, emission controls, idle speed, ignition timing, and transmission solenoids. Perform all possible test steps under TROUBLE SHOOTING in the AUTO TRANS OVERHAUL - FORD E40D article. If referred here by trouble shooting charts or testing procedure, proceed with self-diagnostics. Some circuit tests in this article may also be used by the experienced technician to help bench test and diagnose solenoids. Transmission fault codes are only output in the KOEO Self-Test. NOTE: In addition to transmission fault codes, engine related fault codes may be output during QUICK TEST procedure. These fault codes pertain to engine performance and must be repaired first, as engine performance will greatly affect transmission operation. For information and testing procedures of engine related fault codes and components, see appropriate TESTS W/CODES - EEC-IV article in the ENGINE PERFORMANCE section. SELF-DIAGNOSTIC SYSTEM DIAGNOSTIC FORMATS QUICK TEST and CIRCUIT TESTS are diagnostic formats used to test and service EEC-IV system. QUICK

2 of 57 12/12/2014 11:46 AM TEST allows technician to identify problems and retrieve service codes. CIRCUIT TESTS check circuits, sensors and actuators. Before starting any circuit test, follow all steps under QUICK TEST to find correct circuit test. If vehicle passes QUICK TEST and no driveability symptoms or intermittent faults exist, EEC-IV system is okay. SERVICE CODES During QUICK TEST, 3 types of service codes are retrieved: KOEO, KOER and Continuous Memory codes. See QUICK TEST for self-test procedures. Codes may be cleared from ECA memory after they have been recorded or repaired. See CLEARING CODES. KOEO & KOER Codes (Hard Faults) These codes indicate faults are present at time of testing. A hard fault may cause CHECK ENGINE or MALFUNCTION INDICATOR LIGHT (MIL) to glow and remain on until fault is repaired. If KOEO or KOER codes are retrieved during KOEO SELF-TEST or KOER SELF-TEST, use SERVICE CODE REFERENCE & DEFINITION CHARTS to find correct testing and repair procedures. Continuous Memory Codes (Soft Faults) These codes indicate a fault that may or may not be present at time of testing. These codes are used to diagnose intermittent problems. Continuous Memory Codes are retrieved during KOEO SELF-TEST. Some codes may turn on MIL or CHECK ENGINE light. Corresponding soft trouble code will be retained in ECA memory. If fault does not reoccur within 40 warm-up cycles (80 cycles on some models), ECA will automatically clear code. Technician may clear service codes from memory. See CLEARING CODES. Intermittent faults may be caused by a sensor, connector or wiring-related problem. CAUTION: Continuous Memory Codes should be recorded when retrieved during KOEO SELF-TEST. These codes may be used to identify intermittent problems that exist after all KOEO and KOER codes have been repaired and a Code 11 or 111 (pass code) has been obtained. Failure to follow this procedure may result in unnecessary testing. Some Continuous Memory Codes faults may not be valid after KOEO and KOER codes are repaired. RETRIEVING CODES Service codes are retrieved from EEC-IV system through self-test connector. Various methods and test equipment may be used to access these codes: Analog Volt-Ohmmeter (VOM) Scan tester In-Dash Malfunction Indicator Light (MIL) or CHECK ENGINE light. SELF-TEST CONNECTOR LOCATIONS Application Bronco & "F" Series "E" Series Location Left Front Inner Fender Panel Right Front Inner Fender Panel READING CODES

3 of 57 12/12/2014 11:46 AM KOEO & KOER SELF-TEST Codes Question: 1992 f-150 4x4 All service codes are 2 or 3-digit numbers. Some vehicles may output a 2 or 3 digit code for the same fault. See SERVICE CODE REFERENCE & DEFINITION CHARTS. ECA outputs codes one digit at a time. These codes indicate current faults in system and should be serviced in order of appearance. Codes are shown as voltage pulses (needle sweeps) on an analog Volt/Ohmmeter (VOM). See Fig 1. If using VOM, pay careful attention to length of pauses in order to read codes correctly. A 1/2-second pause occurs between number of sweeps in a digit, and a 2-second pause occurs between digits in a code. A 4-second pause occurs between each code. KOEO codes are separated from Continuous Memory codes by a 6-second delay, a single 1/2-second sweep (Separator) and another 6-second delay. Record codes in order received. Scan tester, if used, will count pulses and display them as a digital code. STAR Series Tester will add a zero (0) to single-digit Separator Code (10) and Dynamic Response Code (10). Dynamic Response Code is displayed in KOER SELF-TEST. See Fig 1. If using CHECK ENGINE light, service codes are displayed as flashes. Separator Pulse Single 1/2-second separator pulse is issued 6-9 seconds after last KOEO code. Continuous Memory Codes (soft faults) are then displayed 6-9 seconds after 1/2-second separator pulse. Some digital test equipment may display separator code as "10" instead of "1". Pass Codes A Code 11 or 111 indicates no service codes were recorded in that portion of test; system passes that portion of test. If Code 11 or 111 is not retrieved in KOEO SELF-TEST, codes retrieved during KOER SELF-TEST may not be valid. Code 11 or 111 (pass code) must be obtained in KOEO SELF-TEST. A Code 11-1-11or 111-1-111 output during KOEO SELF-TEST indicates no KOEO code or Continuous Memory Code was recorded. Separator code may appear as "10" instead of "1" on some test equipment. Continuous Memory Codes These codes result from information stored by ECA during continuous self-test monitoring. Codes are displayed after separator pulse code in KOEO SELF-TEST. Use these codes for diagnosis only when KOEO SELF-TEST and KOER SELF-TEST result in Code 11 or 111 (pass code) and all steps under QUICK TEST are successfully completed. (A few codes are exceptions which may be checked after KOEO codes have been repaired). These codes indicate faults recorded within last 40 engine starts (80 engine starts on some models). Fault may or may not be currently present. See SERVICE CODE REFERENCE & DEFINITION CHARTS. Fast Codes At start of KOEO SELF-TEST and after Wide Open Throttle (WOT) request in KOER SELF-TEST, ECA outputs short bursts of information, known as FAST CODES, which were used by manufacturer during assembly. With most equipment, these code bursts are not visible; an entire code sequence lasts less than 1/2 second. If this fluctuation is visible on test equipment, ignore it.

4 of 57 12/12/2014 11:46 AM Fig 1: Reading Service Codes (2-Digit Codes Shown; 3-Digit Codes Similar) Courtesy of FORD MOTOR CO. CLEARING CODES To clear codes from ECA memory, start KOEO SELF-TEST. When service codes appear on test equipment or CHECK ENGINE light, disconnect jumper wire from Self-Test Input (STI) connector. If using STAR Series Tester, unlatch center button. This procedure erases Continuous Memory Codes from ECA memory. If problem has not been corrected or fault is still present, hard code will immediately be reset in ECA memory. CAUTION: DO NOT disconnect vehicle battery to clear codes. This will erase stored operating information from Keep-Alive Memory (KAM). To clear KAM, disconnect negative battery terminal for at least 5 minutes. WARNING: When battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES in the APPLICATIONS & IDENTIFICATION section before disconnecting battery. QUICK TEST

5 of 57 12/12/2014 11:46 AM DESCRIPTION Following procedures are functional tests of EEC-IV system. The following 5 basic test steps must be carefully followed in sequence, otherwise misdiagnosis or replacement of non-faulty components may result: Diagnostic Aids Visual Check Equipment Hookup KOEO (Key On, Engine Off) SELF-TEST Computed Timing Check KOER (Key On, Engine Running) SELF-TEST Question: 1/2 shift After each service or repair procedure has been completed, repeat QUICK TEST to ensure all EEC-IV systems work properly and service codes are no longer present. VISUAL CHECK & EQUIPMENT HOOKUP Complete a basic inspection of engine compartment and all components before proceeding to self-diagnostic tests. Ensure vacuum hoses and EEC-IV wiring harnesses are properly connected. Apply parking brake, and place shift lever in "P" position. Block drive wheels. Turn off all electrical loads. Connect appropriate test equipment to vehicle as follows: Analog Volt-Ohmmeter (VOM) Scan Tester 1. Turn ignition switch to OFF position. Set VOM at 0-15V DC range. Connect positive lead of VOM to positive battery terminal. 2. Connect negative VOM lead to Self-Test Output (STO) terminal of self-test connector. See Fig 2. Connect timing light, and go to KOEO SELF-TEST. Activate KOEO SELF-TEST by connecting jumper wire from Self-Test Input (STI) pigtail to signal return terminal of self-test connector with ignition on. Follow manufacturer's instructions to hook up equipment and record service codes. STAR Series Tester Turn ignition switch to OFF position. Connect color-coded adapter cable leads to diagnostic tester. Connect 2 service connectors of adapter cable to vehicle self-test connector and STI pigtail connector. Connect timing light. Go to KOEO SELF-TEST.

6 of 57 12/12/2014 11:46 AM Fig 2: Connecting Self-Test Diagnostic Equipment Courtesy of FORD MOTOR CO. KOEO SELF-TEST Ensure engine is at normal operating temperature. If engine does not start (or stalls after starting), continue KOEO SELF-TEST. DO NOT depress throttle on gasoline engines. Turn ignition off. Wait 10 seconds. Ensure test equipment is properly attached. Turn ignition on (engine off). Record all KOEO and Continuous Memory Codes. If a Code 11 or 111 (pass code) is not retrieved in KOEO portion of test, service KOEO codes at this time. Service any engine codes recorded before servicing transmission codes (Codes 86, 89, 566 and 629). If ECA will not output codes, see appropriate TESTS W/CODES article in the ENGINE PERFORMANCE section.

7 of 57 12/12/2014 11:46 AM If service codes are retrieved, observe the following procedures: If CHECK ENGINE or SERVICE ENGINE SOON light is on, service codes in order retrieved. On vehicles equipped with DIS and EDIS ignition systems, see SYSTEM/COMPONENT TESTS article or SYSTEM/COMPONENT TESTS - DIESEL article in the ENGINE PERFORMANCE section if Continuous Memory Code 45, 46, 48, 215, 216, 217, 232 or 238 is retrieved during KOEO SELF-TEST. Repair ignition system as necessary. If vehicle has a no-start condition, go to appropriate no-start CIRCUIT TESTS in appropriate TESTS W/CODES article in the ENGINE PERFORMANCE section. If vehicle displays a Code 11 or 111 (pass code) and does not have any of symptoms described in previous steps, go to COMPUTED TIMING CHECK. COMPUTED TIMING CHECK Turn ignition off, and wait 10 seconds. Using jumper wire or test equipment, activate KOER SELF-TEST. If engine starts and stalls (or stalls during self-test), go to CIRCUIT TEST S (System Test) in TEST W/CODES - EEC-IV article in the ENGINE PERFORMANCE section. Start engine, and check for following: KOER SELF-TEST Diagnostic Aids If Code 98 or 998 is displayed, EEC-IV system is operating in Failure Mode Effects Management (FMEM). Vehicle cannot be diagnosed in KOER SELF-TEST; rerun KOEO SELF-TEST. Check computed timing after last service code has been displayed. Timing will remain fixed for 2 minutes after last code has been retrieved unless self-test is deactivated. Computed timing, at crankshaft, should equal base timing (see vehicle emission decal) plus 20 degrees BTDC. This timing may vary 3 degrees (+/-). If computed timing is within specification, perform KOER SELF-TEST. If timing is not within specification, go to step 2) of CIRCUIT TEST PA (TFI), PB (DIS) or PC (EDIS). See appropriate TESTS W/CODES article in the ENGINE PERFORMANCE section. DO NOT enter this test sequence until a Code 11 or 111 (pass code) has been retrieved in KOEO SELF-TEST. If system has not passed KOEO SELF-TEST, codes recorded in KOER SELF-TEST may not be valid. Deactivate self-test by removing and reconnecting jumper wire or by procedure specified by test equipment in use. Start engine, and run it for 2 minutes at 2000 RPM to warm Heated Exhaust Gas Oxygen (HEGO) sensor. Turn engine off, and wait 10 seconds. Activate KOER SELF-TEST using a jumper wire or appropriate procedure for test equipment used. Start engine. Record all service codes displayed. Check following items: If engine starts and stalls (or stalls during self-test), go to CIRCUIT TEST S. See TESTS W/CODES - EEC-IV article in the ENGINE PERFORMANCE section. See menu below. If Code 98 or 998 is displayed, EEC-IV system is operating in Failure Management Effects Mode (FMEM) and vehicle has not passed KOEO SELF-TEST. Vehicle cannot be diagnosed while in FMEM mode. See Code 98 or 998 in SERVICE CODE REFERENCE CHARTS of TESTS W/CODES - EEC-IV article in the ENGINE PERFORMANCE section. See menu below. If vehicle is equipped with a Brake On-Off (BOO) switch, brake pedal must be depressed and released after ID code portion of test. On vehicles with Power Steering Pressure Switch (PSPS), turn steering wheel at least 1/2 turn and release within 1-2 seconds after ID code portion of test. If Dynamic Response Code appears, perform a brief Wide Open Throttle (WOT). DO NOT perform

8 of 57 12/12/2014 11:46 AM WOT unless requested. If a Code 11 or 111 (pass code) is retrieved during KOER SELF-TEST, service Continuous Memory Codes retrieved in KOEO SELF-TEST. See TESTS W/CODES - EEC-IV article in the ENGINE PERFORMANCE section. If a Code 11 or 111 (pass code) is retrieved during Continuous Memory Code portion of KOEO SELF-TEST (Code 11-1-11 or Code 111-1-111) and no driveability problem exists, EEC-IV testing is complete. If driveability problems are still present, go to TROUBLE SHOOTING in the AUTO TRANS OVERHAUL - FORD E40D article. If KOER codes are present, see SERVICE CODE REFERENCE & DEFINITION CHARTS. If system will not output codes, go to CIRCUIT TEST QA. See appropriate TESTS W/CODES article in the ENGINE PERFORMANCE section. CONTINUOUS MONITOR MODE (WIGGLE TEST) Continuous Monitor Mode allows technician to attempt to recreate an intermittent fault while monitoring system. This mode, also called wiggle test, may be used in both KOEO SELF-TEST and KOER SELF-TEST. Circuit tests specify use of this procedure to identify intermittent faults in specific circuits or components. KOEO Wiggle Test Procedure Connect test equipment. See Fig 2. Turn ignition on, and activate self-test using jumper lead or diagnostic tester. Wait 10 seconds, and then deactivate and reactivate self-test. Wiggle test mode is now activated. Tap, move and wiggle suspect sensor and/or harness area. If a fault is detected, a service code may be stored in memory and indicated at diagnostic tester or scan tester. Retrieve code, and perform appropriate test. See SERVICE CODE REFERENCE & DEFINITION CHARTS. KOER Wiggle Test Procedure Connect test equipment. See Fig 2. Turn ignition off, and wait 10 seconds. Start engine. Activate self-test using jumper lead or diagnostic tester. Wait 10 seconds, and then deactivate and reactivate self-test. DO NOT turn engine off. KOER wiggle test mode is now activated. Tap, move and wiggle suspect sensor and/or harness area. If a fault is detected, a service code may be stored in memory and indicated at diagnostic tester or scan tester. Retrieve code, and perform appropriate test. See SERVICE CODE REFERENCE & DEFINITION CHARTS. ADDITIONAL SYSTEM FUNCTIONS Additional diagnostic system features are available to help diagnose driveability problems and service EEC-IV systems. FUNCTIONS CHECK ENGINE Light & Malfunction Indicator Light (MIL) CHECK ENGINE light and MIL are intended to alert driver of certain malfunctions in EEC-IV system. Light may also be used to retrieve service codes stored in ECA. When hooked up for KOEO SELF-TEST or KOER SELF-TEST, light will display all codes which turn on light during vehicle operation, not just Continuous Memory Codes. If light comes on during vehicle operation, vehicle should be inspected as soon as possible. Immediately turning off engine is not necessary; vehicle can be driven with light on. If light comes on and then goes off during vehicle operation, code causing light to glow will be stored in ECA memory as a Continuous Memory Code. Light should come on when ignition is turned on and go out when engine is started. If hard fault codes are not

9 of 57 12/12/2014 11:46 AM present, ECA turns out light when it receives a Profile Ignition Pick-Up (PIP) signal. If light does not come on, see SYMPTOMS in TESTS W/O CODES - GASOLINE article in the ENGINE PERFORMANCE section. Output State Check Output State Check is used as an aid in servicing output actuators and solenoids associated with EEC-IV system. It allows technicians to energize and de-energize most system output actuators on command. This mode is entered from KOEO SELF-TEST after all codes have been retrieved. Leave KOEO SELF-TEST activated, and depress throttle to initiate test sequence. Each time throttle is depressed and released, output actuators will change state (from on to off or off to on). Failure Management Effects Mode (FMEM), Code 98 Or 998 FMEM mode allows system operation when sensors fail or transmit signals that are out of normal operating range. During FMEM mode, ECA substitutes a mid-range signal for defective sensor while continuing to monitor sensor. If faulty sensor's signals return to normal operating range, ECA will use those signals. A Code 98 or 998 will be displayed when FMEM mode is in effect. Hardware Limited Operational Strategy (HLOS) If a number of system or sensor failures are present and ECA is not receiving enough information to operate, ECA will switch to HLOS mode. ECA will output fixed values to allow operation of vehicle. Driveability concerns will be present. ECA will not output service codes in this mode. Cylinder Balance Test This test helps identify a weak or non-contributing cylinder in engines with sequential PFI fuel systems. ECA shuts off fuel supply to each injector and measures RPM drop. It computes variation between cylinders and identifies weak ones. This test mode is entered from KOER SELF-TEST after all codes have been displayed. Within 2 minutes after codes have been displayed, lightly depress throttle (a 2-3 degree throttle angle is required, not a wide open throttle). After a brief stabilizing period, ECA will activate test procedure. Test will be repeated if throttle is depressed within 2 minutes of final code output. During second and third test sequences, percentage of allowable variation between cylinders is reduced. Service codes displayed during this test identify weak or non-contributing cylinder. See CYLINDER BALANCE TEST SERVICE CODES table. If Code 90 is displayed during this test, system has passed test. If Code 77 is displayed, repeat cylinder balance test. If throttle is moved during this test, Code 77 will appear, indicating test is not completed. Total test time is about 3 minutes. CYLINDER BALANCE TEST SERVICE CODES Service Code Application 90 Pass 10 Cylinder No. 1 20 Cylinder No. 2 30 Cylinder No. 3 40 Cylinder No. 4 50 Cylinder No. 5 60 Cylinder No. 6 70 Cylinder No. 7 80 Cylinder No. 8 77 Retest

10 of 57 12/12/2014 11:46 AM SUMMARY If no service codes (or pass code 11-1-11 or 111-1-111) is present but driveability problem still exists, return to TROUBLE SHOOTING in AUTO TRANS OVERHAUL - FORD E40D article. SERVICE CODE REFERENCE & DEFINITION CHARTS CODE REFERENCE & DEFINITION CHART (1991) Fault Code (1) KOEO Codes Code Definition Circuit Test & Step 91/621 Shift Solenoid No. 1 (SS1) Circuit Failure TC18 92/622 Shift Solenoid No. 2 (SS2) Circuit Failure TC18 99/624 Electronic Pressure Control (EPC) Circuit Failure TC20 98/625 Electronic Pressure Control (EPC) Driver Circuit Open In ECA TC20 93/626 Converter Clutch Solenoid (CCS) Circuit Failure TC18 94/627 Converter Clutch Control (CCC) Solenoid Circuit Failure TC18 89/629 Converter Clutch Control (CCC) Solenoid Circuit Failure TC18 97/631 Overdrive Cancel Indicator Light (OCIL) Circuit Failure TC10 47/633 4X4 Switch Closed TC10 26/636 Transmission Oil Temp (TOT) Sensor Out Of Self-Test Range TC30 56/637 Transmission Oil Temp (TOT) Circuit Open TC40 66/638 Transmission Oil Temp (TOT) Circuit Grounded TC50 65/654 Manual Lever Position (MLP) Sensor Not In Park Position TC1 Continuous Memory Codes 29/452 Insufficient Input From Vehicle Speed Sensor (VSS) DP1 49/617 1-2 Shift Error TC90 59/618 2-3 Shift Error TC90 69/619 3-4 Shift Error TC90 99/624 Electronic Pressure Control (EPC) Circuit Failure TC90 62/628 Converter Clutch Error TC90 67/634 Manual Lever Position (MLP) Sensor Voltage Out Of Range TC90 56/637 Transmission Oil Temp (TOT) Circuit Open TC90 66/638 Transmission Oil Temp (TOT) Circuit Grounded TC90 KOER Codes 65/632 Overdrive Cancel Switch (OCS) Not Changing State TC10 26/636 Transmission Oil Temp (TOT) Sensor Voltage Out Of Self-Test Range TC30

11 of 57 12/12/2014 11:46 AM (1) Fault codes are listed with 2-digit code/3-digit code. CODE REFERENCE & DEFINITION CHART (1992) Fault Code (1) KOEO Codes Code Definition Circuit Test & Step 49/617 1-2 Shift Error TG90 59/618 2-3 Shift Error TG90 69/619 3-4 Shift Error TG90 91/621 Shift Solenoid No. 1 (SS1) Circuit Failure TC1 92/622 Shift Solenoid No. 2 (SS2) Circuit Failure TC1 99/624 Electronic Pressure Control (EPC) Circuit Failure TC10 98/625 Electronic Pressure Control (EPC) Driver Circuit Open In ECA TC10 94/627 Converter Clutch Control (CCC) Solenoid Circuit Failure TC1 93/629 Converter Clutch Control (CCC) Solenoid Circuit Failure TC1 97/631 Overdrive Cancel Indicator Light (OCIL) Circuit Failure TB1 47/633 4X4 Switch Closed TB1 26/636 Transmission Oil Temp (TOT) Sensor Voltage Out Of Self-Test Range TE1 56/637 Transmission Oil Temp (TOT) Circuit Open TE10 66/638 Transmission Oil Temp (TOT) Circuit Grounded TE20 00/654 Manual Lever Position (MLP) Sensor Not In Park Position TD1 Continuous Memory Codes 29/452 Insufficient Input From Vehicle Speed Sensor (VSS) DS1 99/624 Electronic Pressure Control (EPC) Circuit Failure TG90 62/628 Converter Clutch Error TG90 67/634 Manual Lever Position (MLP) Sensor Voltage Out Of Self-Test Range TD1 56/637 Transmission Oil Temp (TOT) Circuit Open TG91 66/638 Transmission Oil Temp (TOT) Circuit Grounded TG91 KOER Codes 65/632 Overdrive Cancel Switch (OCS) Not Changing State TB1 26/636 Transmission Oil Temp (TOT) Sensor Voltage Out Of Self-Test TE1 (1) Fault codes are listed with 2-digit code/3-digit code. CIRCUIT TESTS (1991)

12 of 57 12/12/2014 11:46 AM CIRCUIT TEST - VEHICLE SPEED SENSOR (VSS) Diagnostic Aids Perform this test when directed by QUICK TEST. This CIRCUIT TEST is intended to diagnose: Vehicle Speed Sensor (VSS). VSS wiring harness circuits. ECA. Fig 3: Vehicle Speed Sensor Circuit Courtesy of FORD MOTOR CO. VSS WIRE COLOR IDENTIFICATION Application Wire Color Pin 3 (+) Wire Color Pin 6 (-) "E" Series Dark Green/White Orange/Yellow All Others Gray/Black Pink/Orange Preliminary Instructions Record and clear continuous memory codes. Warm engine to normal operating temperature. In Low gear, accelerate hard to 25 MPH and coast down to a stop. Shut off engine. Perform KOEO SELF-TEST. Go to 1. 1. Continuous Memory Code 29/452 Code 29/452 indicates there is insufficient input to ECA from VSS. Possible causes for this code are: 1. Faulty VSS. 2. Open or shorted circuit. 3. Faulty ECA. Perform appropriate drive cycle procedure. If Code 29/452 is still present, go to step 2). If code is not present or complaint cannot be verified, fault cannot be duplicated at this time. Clear codes, and see TROUBLE SHOOTING in the AUTO TRANS OVERHAUL - FORD E40D article.

13 of 57 12/12/2014 11:46 AM 2. Check VSS Circuit Continuity Turn ignition off and wait 10 seconds. Remove ECA 60-pin connector and inspect for damaged pins, corrosion, or loose wires. Repair as necessary. Install breakout box. With ECA and VSS disconnected, set DVOM on 200-ohm scale. Measure resistance between test pin No. 3 at breakout box and VSS DIF (+) circuit at VSS vehicle harness connector. See Fig 4. Also measure resistance between test pin No. 6 at breakout box and VSS DIF (-) circuit vehicle harness connector. If both readings are 5 ohms or less, go to next step. If readings are 5 ohms or more, service open circuit in VSS wiring harness. After repairs, reconnect all components and repeat step 1). Fig 4: Checking VSS Circuits Courtesy of FORD MOTOR CO. 3. Check VSS Circuits For Shorts To Power Or Ground Turn ignition off. With ECA and VSS disconnected, install breakout box. Set DVOM on 200-k/ohm scale. Measure resistance between test pin No. 3 and test pins No. 37, 40 and 6. If all readings are greater than 500 ohms, remove breakout box, reconnect components and go to step 4). If any reading is less than 500 ohms, repair short(s) in VSS wiring harness and reconnect components. After repairs, repeat step 1). 4. Checking VSS Resistance Turn ignition off and wait 10 seconds. Disconnect VSS. Set DVOM on 2-k/ohm scale. Measure resistance across vehicle speed sensor. If reading is 190-250 ohms, replace ECA. Remove breakout box, reconnect components and repeat step 1). If reading is NOT 190-250 ohms, replace vehicle speed sensor and repeat appropriate drive cycle procedure. CIRCUIT TEST TC - E4OD AUTOMATIC TRANSMISSION Diagnostic Aids Perform this test only when directed by QUICK TEST. To prevent replacing good components, be aware following non-eec areas may be at fault: Engine base condition (cam timing, valves rings, etc.). Brakes. Transmission fluid, friction elements and cooling. This test is not intended to diagnose transmission. This test is intended to diagnose: Wiring harness circuits CCC, CCS, 4WD LOW, EPC, OCIL, OCS, SS1, SS2, SIG RTN, TOT, MLP, EPC PWR and VPWR. Faulty ECA.

14 of 57 12/12/2014 11:46 AM Fig 5: E4OD & MLP Circuit Courtesy of FORD MOTOR CO.

15 of 57 12/12/2014 11:46 AM Fig 6: 4WD Low & Overdrive Cancel Harness Schematic Courtesy of FORD MOTOR CO. 1) Code 634, 654 & 67: Check Resistance Through MLP Sensor Code 67/634 indicates that total resistance in the MLP sensor is out of Self-Test range when the selector lever is in "P" (correct range is 3770-4607 ohms). Code 654 indicates that selector lever was not in Park position during self test. Possible causes for this fault are: faulty MLP sensor, open or shorted harness, faulty ECA. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector and inspect for corroded or damaged pins. Service or repair as necessary. Install breakout box, leaving ECA disconnected. With KOEO, measure resistance between test pins No. 30 and 46 at the breakout box while moving the selector from "P" to "L" and back to "P". Record specifications and compare to specification table. See MLP RESISTANCE SPECIFICATIONS table. If resistance is within specification, go to step 3). If resistance is not as specified, go to next step.

16 of 57 12/12/2014 11:46 AM MLP RESISTANCE SPECIFICATIONS Gear Position Min. Ohms Max. Ohms "P" 3770 4607 "R" 1304 1593 "N" 660 807 "D" 361 442 "2" 190 232 "1" 78 95 2) Checking Continuity Of MLP Harness Ensure key is off and MLP sensor is disconnected from harness. Use a mirror to inspect ends of transmission harness connector at MLP sensor for damage or corrosion. Repair as necessary. Install breakout box, leaving ECA disconnected. Measure resistance between test pin No. 30 at the breakout box and corresponding pin at the MLP sensor vehicle harness connector. Measure resistance between test pin No. 46 at the breakout box and corresponding pin at the MLP sensor vehicle harness connector. If both resistances are less than 5 ohms, go to next step. If resistances are not as specified, repair open circuit. Remove breakout box, reconnect components and rerun QUICK TEST. 3) Check MLP Harness For Short To Power Or Ground Turn key off. Ensure MLP sensor harness is disconnected. Install breakout box leaving ECA disconnected. Set DVOM on 200-k/ohm scale. Measure resistance between test pin No. 30 and test pins No. 37 and 57 at the breakout box. Measure resistance between test pin No. 30 and test pins No. 40, 46 and 60 at the breakout box. Measure resistance between test pin No. 30 at the breakout box and chassis ground. If all resistances are 10 k/ohms or more, go to next step. If resistances are less than 10 k/ohms, repair short circuits. Remove breakout box, reconnect components and rerun QUICK TEST. 4) Checking ECA Output Voltage Ensure key is off. Disconnect MLP sensor from harness. Install breakout box and connect ECA. With KOEO, set DVOM on 20-volt scale. Measure voltage between test pins No. 30 and 46 at the breakout box. If voltage is 4.75-5.25 volts, service or adjust MLP sensor. If voltage is not as specified, replace ECA, reconnect components and rerun QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 4) to step 10). No test procedures have been omitted. 10) Code 47/633, 65/632, 97/631: Verify Self-Test Mode Code 47/633 indicates 4WD LOW selector lever is not in 2WD or 4WD High position during KOEO Self-Test. This condition may be accompanied by an early shift in the 4WD High range. Code 65/632 indicates that Overdrive Cancel Switch (OCS) is not cycled between the engine I.D. code and "Goose Test" in the KOER Self-Test. Code 97/631 indicates an Overdrive Cancel Indicator Light (OCIL) fault during KOEO Self-Test. Possible causes for this fault are: faulty 4WD LOW switch, faulty OCS switch, burned out bulb, open harness, shorted harness or faulty ECA. Rerun QUICK TEST. If none of the above codes are present and fault cannot be duplicated at this time, testing is complete. If Code 97/631 is present, go to step 12). If any other codes are present, go to next step. 11) Cycle 4WD LOW Or Overdrive Cancel Switch Circuit Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector, and inspect for corroded or damaged pins. Service or repair as necessary. Install break-out box, leaving ECA disconnected. With KOEO, set DVOM on 20-volt scale. 4WD LOW CIRCUIT - Measure voltage between test pin No. 12 and test pins No. 40 and 60 at the breakout box while cycling the Overdrive Cancel Switch (OCS). Move transfer case lever between

17 of 57 12/12/2014 11:46 AM 4WD and 2WD positions several times. OVERDRIVE CANCEL SWITCH (OCS) CIRCUIT - Measure voltage between test pin No. 41 and test pins No. 40 and 60 at the breakout box while cycling the Overdrive Cancel Switch. Toggle the switch on the dash several times. If voltage cycles, remove breakout box. Replace ECA and rerun QUICK TEST. If voltage does not cycle, go to step 14) for driveability faults or next step for other faults. 12) Checking Circuits For Shorts To Ground Ensure key is off, breakout box is installed and ECA is disconnected. Set DVOM on 200-k/ohm scale. 4WD LOW CIRCUIT - Disconnect 4WD LOW switch. Measure resistance between test pin No. 12 and test pins No. 40 and 60 at the breakout box. OVERDRIVE CANCEL SWITCH (OCS) CIRCUIT - Disconnect Overdrive Cancel Switch. Measure resistance between test pin No. 41 and test pins No. 40 and 60 at the breakout box. If resistance(s) is 10 k/ohms or more, go to step 15) for Code 47/633 or 65/632. Go to next step for Code 97/631. If resistance is less than 10 k/ohms for Code 47 or 633, repair short circuit and rerun KOEO Self-Test; for Code 65/632, repair short circuit and rerun KOER Self-Test. If Code 65 or 632 is still present, go to step 14). For Code 97/631, repair short circuit and rerun KOEO SELF-TEST. 13) Checking Key Power Through OCIL Circuit With KOEO, ensure breakout box is installed and ECA is disconnected. Set DVOM on 20-volt scale. Measure voltage between test pin No. 32 and test pins No. 40 and 60 at the breakout box. If voltage is 10.5 volts or more, remove the breakout box, replace ECA and rerun QUICK TEST. If voltage is less than 10.5 volts, go to next step. 14) Checking Continuity Of LED Harness (4WD Low Or Overdrive Cancel) With key off, disconnect ECA 60-pin connector and inspect for corroded or damaged pins. Service or repair as necessary. Install breakout box, leaving ECA disconnected. Set DVOM for diode check. Disconnect 4WD LOW switch. 4WD LOW CIRCUIT - Measure voltage between Key Power Circuit at the fuse No. 18 (+ probe) and test pin No. 12 (- probe) at the breakout box. OCS-OCIL CIRCUIT - Measure voltage between Key Power Circuit at the fuse No. 5 (+ probe) and test pin No. 32 (- probe) at the breakout box. If voltage is greater than 2 volts, go to next step. If voltage is 2 volts or less, check for a faulty indicator bulb (4WD LOW LED or OCIL) or defective fuse in fuse panel. If fuse is okay, repair open circuit. Remove break-out box and reconnect ECA. Rerun QUICK TEST. 15) Checking Continuity Of The 4WD LOW Or Overdrive Cancel Switch Harness With key off, breakout box installed and ECA disconnected, disconnect appropriate switch. 4WD LOW CIRCUIT - Measure resistance between test pin No. 12 at the breakout box and 4WD LOW circuit at the 4WD LOW switch vehicle harness. OCS-OCIL CIRCUIT - Measure resistance between KEY PWR at fuse panel (ohmmeter positive lead) and power side of OCS harness connector (ohmmeter negative probe). Measure resistance between test pin No. 41 at breakout box and signal side of OCS harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open circuit(s) as necessary. Remove breakout box, reconnect components and rerun QUICK TEST. 16) Checking Circuit(s) For Shorts To Power With key off, ensure breakout box is installed and ECA is disconnected. Set DVOM on 200-k/ohm scale. 4WD LOW CIRCUIT - Disconnect 4WD LOW switch. Measure resistance between test pin No. 12 and test pins No. 37 and 57 at the breakout box.

18 of 57 12/12/2014 11:46 AM OCS-OCIL CIRCUIT - Disconnect OCS switch. Measure resistance between test pin No. 41 and test pins No. 37 and 57 at the breakout box. Measure resistance between test pin No. 32 and test pins No. 37 and 57 at the breakout box. If resistance(s) are 10 k/ohms or more, remove breakout box, replace appropriate switch and rerun QUICK TEST. If resistance(s) are less than 10 k/ohms, repair short circuit(s). Remove breakout box, reconnect ECA and rerun QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 16) to step 18). No test procedures have been omitted. 18) Service Code 91/621, 92/622, 93/626, 94/627, 998 & 99/624 Circuit Identification These service codes indicate that the appropriate on/off solenoid is out of Self-Test range. This may cause harsh, early or late shifting. Reading should be 9-14.5 volts when ON and less than 1.0 volt when OFF. Code 98 indicates Electronic Pressure Control (EPC) solenoid may have a faulty driver in the ECA. Code 99/624 indicates a faulty EPC circuit which may cause harsh shifting and clutch wear. Code 89/629 should be tested the same as 94/627. Possible causes for these codes are: solenoid resistance is out of limits, harness circuit is open or grounded, or faulty ECA. Fig 7: Solenoid & Circuit Identification Chart If any of the listed codes are present, go to step 20) for 7.3L Diesel vehicles or ENTER OUTPUT STATE CHECK for all others. If codes are not present, go to KOEO SELF-TEST procedures.

19 of 57 12/12/2014 11:46 AM ENTER OUTPUT STATE CHECK - Turn key off and wait 10 seconds. Set DVOM on 20-volt scale. A VOM or DVOM MUST be used for this test. CAUTION: DO NOT perform Output State Check on 7.3L Diesel-E4OD vehicles, or damage to transmission may occur. This check is for 4.9L/5.0L/5.8L/7.5L E4OD vehicles only. Connect DVOM negative (-) test lead to STO circuit at Self-Test connector and positive (+) test lead to battery positive. Jumper STI circuit to SIG RTN at the Self-Test connector. Perform KOEO SELF-TEST until all Continuous Codes have been displayed. DVOM will indicate less than 1.0 volt when test is complete. Depress and release throttle. If voltage increases, remain in Output State Check and go to next step. If voltage does not increase, depress throttle to WOT and release. If STO voltage does not increase, go to CIRCUIT TEST QC in appropriate TESTS W/CODES article in the ENGINE PERFORMANCE section. Leave test equipment hooked up. 19) Check Suspect E4OD Solenoid Electrical Operation With KOEO, disconnect transmission solenoid bulkhead connector. Use a mirror to inspect both ends of connector for damage or corrosion. Service or repair as necessary. Connect DVOM positive test lead to VPWR circuit and negative test lead to ECA signal test pin at bulkhead connector (see step 18). Set DVOM on 20-volt scale. While observing DVOM, depress and release throttle several times to cycle output on and off. If suspected solenoid output circuit voltage change is 1.0 volt or more, service or repair solenoid. If voltage change is less than 1.0 volt, remove jumper and go to next step. 20) Checking Voltage Of VPWR TO E4OD Transmission Solenoids Turn key off and wait 10 seconds. Leave transmission bulkhead connector disconnected. Use a mirror to inspect both ends of connector for damage or corrosion. Service or repair as necessary. With KOEO, measure voltage between VPWR circuits test pins No. 37 and 57, (EPC power pin 35 on Diesel) at E4OD transmission harness connector and ground. Ensure voltage is greater than 10.5 volts. If voltage is within specification, go to next step. If resistance is not as specified, go to step 22). 21) Checking E4OD Transmission Solenoid Resistance Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector and inspect for corroded or damaged pins. Service or repair as necessary. Install break-out box, leaving ECA disconnected. Connect transmission bulkhead connector. Set DVOM on 200-ohm scale. Measure resistance between test pins No. 37 and 57 (pin No. 35 on diesel) and ECA signal test pin at the breakout box (see step 18). If resistance is within specification, replace ECA, remove breakout box and rerun QUICK TEST. See Fig 8. If resistance is not as specified, go to next step.

20 of 57 12/12/2014 11:46 AM Fig 8: Solenoid Resistance Chart 22) Checking Continuity Of E4OD Solenoid Harness Turn key off and wait 10 seconds. Install breakout box, leaving ECA disconnected. Disconnect transmission bulkhead connector. Measure resistance between the ECA signal test pin at the breakout box and transmission bulkhead connector (see step 18). Measure resistance between test pins No. 37 and 57 (test pin No. 35 on 7.3L Diesel) at the breakout box and EPC PWR and VPWR pins at the E4OD transmission bulkhead connector. See Fig 9. If all resistances are less than 5 ohms, go to next step. If resistance is 5 ohms or more, remove breakout box, repair open circuit and reconnect ECA and solenoids. Rerun QUICK TEST. 23) Checking E4OD Solenoid Harness For Short To Ground Turn key off and wait 10 seconds. Install breakout box, leaving ECA disconnected. Ensure transmission bulkhead connector is disconnected. Set DVOM on 200-k/ohm scale. Measure resistance between ECA signal test pin and test pins No. 40, 46 and 60 at the breakout box. See Fig 7. Measure resistance between the ECA signal test pin at the breakout box and chassis ground. If all resistances are 10 k/ohms or more, go to next step. If resistances are less than 10 k/ohms, repair short circuit(s), remove breakout box, and reconnect ECA and solenoid(s). Rerun QUICK TEST. 24) Checking E4OD Solenoid Harness For Short To Power Turn key off and wait 10 seconds. Install breakout box, leaving ECA disconnected. Ensure transmission bulkhead connector is disconnected. Set DVOM on 200-k/ohm scale. Measure resistance between ECA signal test pin and test pins No. 37 and 57 at breakout box. See Fig 7. If all resistances are 10 k/ohms or more, repair or replace solenoids as necessary. If resistances are less than 10 k/ohms, repair short circuit(s), remove breakout box, and reconnect ECA and solenoid(s). Rerun QUICK TEST. 25) Check Solenoid Driver Signal With key off, install breakout box and leave ECA connected. Disconnect transmission bulkhead connector. Connect a test light between test pin No. 37 or 57 and the ECA signal test pin at the breakout box. See Fig 7. With KOEO, wait 10 seconds. Initiate KOEO Self-Test. If test light flashes momentarily and then stays off, repair transmission solenoids as

21 of 57 12/12/2014 11:46 AM necessary; driver signal is okay. If test light does not flash, replace ECA, reconnect solenoid(s) and rerun QUICK TEST. If test light is always on, solenoid driver is shorted to ground in ECA. Replace ECA, reconnect solenoid(s) and rerun QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 25) to step 30). No test procedures have been omitted. 30) Code 26/636: Check Transmission Oil Operating Temperature Code 26/636 indicates Transmission Oil Temperature (TOT) sensor is out of Self-Test range. Correct voltage is 0.21-3.50. Possible causes for this fault are: TOT resistance is out of range or ECA is faulty. Drive vehicle normally in city traffic for 20-30 minutes to bring transmission oil temperature to at least 50 F (10 C). In extremely cold weather, a longer warm-up drive may be necessary. Rerun QUICK TEST. If code 26/636 is still present, go to next step. If code 26/636 is no longer present, service or repair other codes as necessary. 31) Checking For VREF At Throttle Position Sensor (TPS) Refer to wiring circuit diagrams in VREF checks. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector and inspect for corroded or damaged pins. Service or repair as necessary. Install breakout box and connect ECA to breakout box. Disconnect TPS (FIPL on 7.3L Diesel) and set DVOM on 20-volt scale. With KOEO, measure voltage between VREF and SIG RTN at the TPS (or FIPL) vehicle harness connector. If voltage is 4.0-6.0 volts, reconnect TPS (or FIPL) and go to next step. If voltage is not as specified, go to CIRCUIT TEST C in appropriate TESTS W/CODES article in the ENGINE PERFORMANCE section. 32) Checking Resistance Of TOT Sensor Ensure transmission temperature is 50 F (10 C). If transmission has cooled down, repeat test drive. Turn key off and wait 10 seconds. Ensure breakout box is installed and ECA is disconnected. Ensure bulkhead connector is connected at transmission. Set DVOM on 200-k/ohm scale. With KOEO, ensure transmission oil pan is "warm to touch" on side away from exhaust manifold. Measure resistance between test pin No. 42 (test pin No. 7 on 7.3L Diesel) and test pin No. 46 at the breakout box. If resistance is within specification, go to next step. See Fig 9. If resistance is not as specified, repair or replace TOT sensor.

22 of 57 12/12/2014 11:46 AM Fig 9: TOT Resistance Chart 33) Checking TOT Sensor Resistance In Relation To Oil 1Temperature Change TOT sensor may be within specification range (.8-100 k/ohms) and not correspond to temperature. Ensure transmission fluid is at operating temperature. Measure TOT resistance again and compare to resistance recorded in step 32). If resistance increased or decreased due to temperature change, replace ECA. If resistance did not change, replace breakout box, reconnect ECA, and replace temperature sensor. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 33) to step 40). No test procedures have been omitted. 40) Code 56/637: Attempt To Generate Code 66/638 Code 56/637 indicates TOT signal is greater than Self-Test maximum value of 4.80 volts. Possible causes for this fault are: faulty TOT sensor, open harness circuit, faulty ECA. Turn key off and wait 10 seconds. Disconnect transmission bulkhead connector from TOT sensor. Inspect for corroded or damaged pins. Service or repair as necessary. Insert a jumper wire at the bulkhead connector between TOT SIGNAL and SIG RTN. Run KOEO SELF-TEST. If Code 66/638 is present, remove jumper wire and service or replace TOT sensor. If Code 66/638 is not present, remove jumper wire and go to next step. 41) Check Continuity Of TOT SIGNAL & SIG RTN Circuit Turn key off and wait 10 seconds. Ensure bulkhead connector is disconnected at transmission. Disconnect ECA 60-pin connector and inspect for corroded or damaged pins. Service or repair as necessary. Install break-out box, leaving ECA disconnected. Measure resistance between TOT SIGNAL at the bulkhead connector and test pin No. 42 (test pin No. 7 on 7.3L Diesel) at the breakout box. Measure the resistance between SIG RTN at the bulkhead connector and test pin 46 at the breakout box. If both resistances are less than 5 ohms, replace ECA, remove breakout box, reconnect ECA and bulkhead connector. Rerun QUICK TEST. If resistances are 5 ohms or more, repair open circuits, remove breakout box and reconnect ECA.

23 of 57 12/12/2014 11:46 AM Rerun QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 41) to step 50). No test procedures have been omitted. 50) Code 66/638: Attempt To Generate Code 56/637 Code 66/638 indicates that TOT signal is less than 0.15 volt (Self-Test minimum value). Possible causes for this fault are: faulty TOT sensor, grounded harness or faulty ECA. Turn key off and wait 10 seconds, then disconnect transmission connector from bulkhead connector. Inspect for corroded or damaged pins. Service or repair as necessary. Run KOEO Self-Test. If Code 56/637 is present, service or replace TOT sensor. If Code 56/637 is not present, go to next step. 51) Checking VREF At TPS Refer to wiring circuit diagrams in VREF checks. Turn key off and wait 10 seconds. Disconnect ECA 60-pin connector and inspect for corroded or damaged pins. Service or repair as necessary. Install breakout box and connect ECA to breakout box. Disconnect TPS (FIPL on 7.3L Diesel) and set DVOM on 20-volt scale. With KOEO, measure voltage between VREF and SIG RTN at the TPS (or FIPL) vehicle harness connector. If voltage is 4.0-6.0 volts, reconnect TPS (or FIPL) and go to next step. If voltage is not as specified, go to CIRCUIT TEST C in appropriate TESTS W/CODES article in the ENGINE PERFORMANCE section. 52) Checking TOT Signal For Short To Ground Turn key off and wait 10 seconds. Ensure bulkhead is disconnected at transmission. With breakout box installed and ECA disconnected, set DVOM on 200-k/ohm scale. Measure resistance between test pin No. 42 (test pin No. 7 on 7.3L Diesel) and test pins No. 40, 46 and 60 at the breakout box. If all resistances are 10 k/ohms or more, replace ECA and remove breakout box. Reconnect components and rerun QUICK TEST. If resistances are less than 10 k/ohms, repair short circuit, remove breakout box and reconnect components. Rerun QUICK TEST. NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 52) to step 90). No test procedures have been omitted. 90) Checking MLP, TOT Sensor & E4OD Solenoid Drive Cycle Bring engine to operating temperature. Verify transmission fluid level and that all components are connected. Run KOEO Self-Test and record Continuous Memory Codes. If Codes 49/617, 59/618 or 69/619 are present, go to step 96). If Codes are not present, record and clear Continuous Memory Codes. Select "D" range and enable "OD". Drive vehicle in city traffic using moderate acceleration. Hold throttle opening steady while transmission is shifting through all four gears and hold throttle steady for an additional 15 seconds. Apply brakes while coming to a stop and remained stopped for 20 seconds. Repeat previous drive step. Rerun KOEO Self-Test and record Continuous Memory Codes. If a Code 111 or 11 is present, go to next step. If Code 29 or 452 is present, go to CIRCUIT TEST DP, step 1). For Codes 56/637, 62/628, 66/638, 67/634, 99/624, go to step 92). 91) Attempt To Generate Continuous Memory Code 56/637, 62/628, 66/638, 67/634 or 99/624 Before performing any procedures in this step, complete the drive cycle test. Drive vehicle approximately 15 minutes over a rough road to simulate road shock. Observe MIL LED while driving for indication of a fault. If MIL flashes ON and OFF, go to next step. If light does not flash, fault may not be duplicated at this time. Testing is complete. 92) Check Circuit Using KOEO Continuous Monitor Mode Enter KOEO Continuous Monitor Mode. Observe VOM or STAR LED for indication of a fault while performing the following. MLP SENSOR (CODE 67/634) - Lightly tap on MLP sensor to simulate road shock. Wiggle