SUM EFI Wiring Harness for GM LS1 Engine INSTALLATION INSTRUCTIONS

Transcription

1 SUM EFI Wiring Harness for GM LS1 Engine INSTALLATION INSTRUCTIONS 1

2 INTRODUCTION This harness is designed for GM LS1 fuel injected engines utilizing a mechanical throttle body and throttle cable. Use of a mechanical throttle body and throttle cable on a GM LS1 fuel injected engine in lieu of the drive-by-wire throttle body will allow this harness to also work with later 2003 and 2004 LS1 engine. Even with minimal experience, this kit should provide an easy installation of this engine into the vehicle of your choice. This harness can also control a 4L60E automatic transmission or T- 56 manual transmission. SECTION 1 REQUIRED PARTS AND TOOLS REQUIRED COMPUTER This harness has been designed to work with the factory EFI computer from LS1 equipped Camaros and Firebirds (GM Service Part Numbers or ). The computer, fuse box and relays are intended to be mounted under the instrument panel. Please be aware that the factory EFI computer has a Vehicle Anti Theft System (VATS) and will not allow the vehicle to run if you do not have the proper ignition key. This harness has provisions for use of a Summit VATS module sold separately. As an alternative to buying the stand-alone VATS module, you may also have the factory EFI computer recalibrated to remove VATS. Recalibration of the factory EFI computer will also allow you to eliminate devices in the original calibration that do not apply to your specific vehicle. NOTE: If the factory EFI computer is not recalibrated, the check engine light will come on in most cases. This issue will be eliminated after recalibration of the factory EFI computer. NOTE: Most remanufactured computers come without a calibration and must be calibrated before use. NOTE: The calibration in your computer must match the transmission installed in the vehicle. You cannot run a 4L60E transmission with a computer programmed for a T56. The instructions that follow are for the installation of the SUM EFI Wiring Harness Kit. Please pay close attention to all BOLD statements as they are intended to provide special notations which are intended to offer a trouble free installation. REQUIRED TOOLS In addition to common hand tools, you will need the following: Crimping Tool Wire Stripper Digital Volt/Ohm Meter Solder Gun/Solder Electrical Tape/Shrink Tubing Electric Drill Motor 2 1/2 Hole Saw (for firewall pass-through grommet) 2

3 RECOMMENDED COMPONENTS It is recommended that you use the parts listed in Table 1 as they will meet all requirements and are compatible with the Summit SUM EFI Wiring Harness. Use of one of the computers listed in the Introduction is required for proper operation of the LS1 engine and this EFI harness. For the additional sensors and relays recommended, GM and AC Delco part numbers have been provided. Table 1 Parts List LS1 Fuel Injection Harness Factory EFI Computer Service or Service Fuel Pump Relay Delco Brake Switch Delco D850A Gear Indicator Switch Delco D2286A Air Intake Temp Sensor GM or Delco MAF Sensor GM Engine Coolant Temp Sensor GM or Delco Oxygen Sensor (Driver Side) GM or Delco AFS97 Oxygen Sensor (Pass Side) GM or Delco AFS98 TP Sensor GM or Delco MAP Sensor GM or Delco Idle Air Control Motor GM Knock Sensors GM or Delco Coils GM or Delco D580 Cam Position Sensor GM or Delco Crank Position Sensor GM or Delco VSS (4L60E Only) Delco SECTION 2 - GENERAL EFI HARNESS INSTALLATION OVERVIEW LAYOUT Decide where the computer and fuse block will be mounted in your vehicle. This wire harness is designed to mount these items under dash or in the kick panel on the right side. They must be no further than the wiring will allow, which is approximately 18 inches. VEHICLE GROUNDS By far, the number one problem with poorly running fuel injected vehicles is found to be a poor ground connection SOMEWHERE in the wiring. TAKE SPECIAL CARE TO INSURE THE FOLLOWING: 1. The power ground of the fuel injection wiring harness should have a DIRECT PATH TO THE NEGATIVE POST OF THE BATTERY. While the three grounds provided in this engine harness are designed to mount to a single point on the back of the engine, it is a good practice to attach an additional 4 ga wire from this point directly to the battery negative. 3

4 2. If you have a trunk mounted battery, it may be tempting to use the vehicle chassis in the place of the additional 4 ga wire mentioned above. Take the time to run this stand-alone 4 ga wire from the battery negative to the single ground point on the back of the engine. If you choose to ignore this HIGHLY EMPHASIZED RULE, you must be aware that, even if the vehicle starts and runs ok at initial start-up, problems will likely occur once the vehicle is hot as heat will change the resistance of the ground path. Cruising on a HOT day may enhance these problems as well. Take the extra time to do it right the first time to avoid the added frustration of removing a secured harness to add the 4 ga ground wire after initial assembly to fix a poorly running vehicle. A properly grounded engine harness should consist of a triangle of grounds as follows: a. Battery Negative to Engine Connect a 4 ga ground cable directly from the battery negative to the engine. b. Engine to Chassis Connect a ground strap from the engine to the vehicle chassis. c. Chassis to Battery Negative Connect a 4 ga ground cable from the vehicle chassis to battery negative. WIRE HARNESS ROUTING Overlay the engine harness onto the engine and into the passenger compartment, noting locations to avoid which may damage the wiring including sharp edges, exhaust pipes, hood hinges, etc. If there is a concern of interference with these areas which cannot be avoided by rerouting the harness, be prepared to secure the harness with zip ties to keep the harness away from the physical hazard. Keep adequate slack in the harness to prevent possible harness damage when attaching the harness to moving components. Damage by harness flexing occurs primarily when attaching the harness to the vehicle chassis and engine without providing adequate slack to allow for engine movement. FUEL SYSTEM The fuel pump must be designed for use with a FUEL INJECTED engine and must be sized to provide 58 psi (pounds per square inch) of fuel pressure under all engine operating conditions. A regulator must be installed to maintain 58 psi fuel pressure at the fuel rail. VERY IMPORTANT! The fuel pump used should be either an in-tank pump or a true GRAVITY-FED pump meaning the lowest portion of the fuel tank must be above the inlet of the fuel pump. If the fuel pump is mounted higher than the level of the fuel in an almost empty tank, a vacuum will be created in the fuel line. Vacuum leads to pump cavitation (fuel vapor bubbles) and this WILL create problems. Keep in mind that these fuel vapor bubbles will be compressed and cannot escape out of the fuel system except through the injectors. When the bubbles pass, the injectors will no longer be under pressure and a lean condition will occur leading to poor drivability and/or SEVERE ENGINE DAMAGE. WIRE COLORS Wire color will be referenced in these instructions as a two letter abbreviation of the color name. For example, a pink wire will be referred to in these instructions as a PK wire. A complete list of wire colors and the abbreviations are shown in Table 2. Table 2 Wire Color List BK Black GY Gray RD Red WH White PK Pink OG Orange YE - Yellow DG Dark Green LG Light Green DB Dark Blue LB Light Blue VT Violet or Purple BR Brown TN Tan 4

5 In many instances, a wire will have a tracer stripe to differentiate it from a solid color wire. An example would be a BK/WH wire. In this example, the insulation of the wire would be black with a thin white stripe printed along the length of the wire. We have made every effort to keep the wire insulation and stripe colors as different as possible, but please be careful to observe all wires for subtle stripe colors differences. Incorrect wire identification can result in computer and/or sensor damage if the wrong wires are hooked up to the wrong components. ELECTRICAL SYSTEM TO PREVENT DAMAGE TO THE COMPONENTS, THE FOLLOWING SHOULD BE STRICTLY ADHERED TO: DISCONNECT THE BATTERY PRIOR TO DOING ANY WIRING! DO NOT connect the computer connectors while the ignition is on as DAMAGE WILL OCCUR! Take care to insure that when routing the wires for the vehicle speed sensor (if used), the VSS wires must be at least 12 inches away from any ignition wiring (spark plug wires, etc). When testing circuits, only use a volt/ohm meter. Avoid using a test light as damage can result to the computer and other electrical components. Never force any connection. Each connector in this harness is unique and is specifically keyed to mating component. Use extreme care when connecting the factory EFI computer to the computer connectors. If this is not performed properly, the pins in the computer can be damaged (bent, etc) and the computer will not function. PRE-INSTALLATION OF THE HARNESS AND PARTS 1. Determine a suitable position to mount the computer and fuse block. 2. Identify where the wiring harness can pass through the passenger side firewall into the engine compartment. You will need to determine proper location to drill a 2 1/2 hole into the firewall sheet metal. Check for any obstructions (wires, hoses, engine, etc.) that may become damaged by the hole saw. 3. Use a center punch to mark the location of the center of the hole. By using the hole punch, this will keep your drill bit from walking as you cut the hole in the firewall. 4. Drill the 2 1/2 hole in the firewall. Clean away any sharp edges with a file or die grinder after you drill the hole. 5. The grommet will need to be cut in order to be installed onto the harness. Using a utility knife, safely make one cut starting from the inside of the grommet and cutting outwards. It is always safest to pull the knife away from you while cutting. 6. One by one starting with the longest wire leads, route the connectors and the fuse block through the hole. You will likely need to fold the computer connectors sideways over the harness to get them to pass through the hole. 7. Wrap the grommet around the harness and fit it into the hole in the firewall until it is seated. 8. Route the fuse block and relays to their mounting locations. 9. Insure that all required engine sensors are installed at this time. 5

6 HARNESS INSTALLATION 10. Lay the harness loosely on the engine and route each connector lead to the corresponding sensor. Remember to route the harness away from any hazards to the wiring such as sharp edges, exhaust pipes, hinges and moving parts. Do not firmly secure the harness at this time. 11. If the harness correctly reaches ALL sensors in the engine compartment, you can now permanently mount the computer, fuse block and relays at this time. 12. Insure that the harness has a fairly loose fit. It should not be tight from the engine to the firewall. Keep in mind that the engine mounts and the vehicle chassis will need room to flex. Also, be certain once again that the harness is not routed near any hazards such as exhaust pipes, hood hinges, exposed screws, sharp edges, etc. 13. You may now secure the harness. TERMINAL INSTALLATION INSTRUCTIONS The following directions are for wires that do not have a connector pre-installed from our factory. NOTE: In the following steps, you will be making circuit connections. Always double check your lengths before cutting any wire. 14. Determine the correct wire length and cut the wire. Remember to allow enough slack in the harness and wires at places where movement could occur. Always double check your calculations. 15. Strip insulation away from the wire. Only strip as much insulation off as necessary for the type of terminal lug you are using. NOTE: In the following step, make sure that the terminal is crimped with the proper die in the crimping tool. An improper crimp will not make a good connection. DO NOT OVERCRIMP. 16. Crimp the terminal onto the wire. 17. Connecting the wires and connectors throughout the harness is a simple process. Make sure that each wire is properly routed and then attached. DO NOT attach the wire first and then route afterward. 18. When all wires are attached, tighten the mounts and ties to secure the harness permanently. 19. Make sure the ignition is off to prevent damage the computer or sensors. 20. Attach the connectors to the re-calibrated EFI computer. Use extreme caution to not bend the pins in the factory EFI computer. 21. After all the connections have been made through the harness, the battery can be connected to the vehicle. CAUTION BE SURE THE IGNITION IS OFF WHEN YOU RECONNECT THE BATTERY OR YOU MAY DAMAGE THE COMPUTER AND SENSORS!!! 6

7 SECTION 3 SPECIFIC EFI HARNESS INSTALLATION (INSTRUCTIONS BY LOCATION) UNDER DASH PANEL INSTALLATION CAUTION: DO NOT MAKE ANY CONNECTIONS WHILE THE COMPUTER IS PLUGGED INTO THE HARNESS. IF YOU HAVE NOT ALREADY DONE SO, DISCONNECT THE BATTERY. The wires in this group consist of the Diagnostic Link Connector (DLC) and the Check Engine Light (premounted on a common bracket) along with 13 other circuits. Diagnostic Link Connector and Check Engine Light Bracket 1. Locate a suitable location under the dash panel for the DLC/Check Engine bracket that will allow easy access to the front of the connector and an unobstructed view of the Check Engine light by the driver. 2. Securely attach the DLC/Check Engine bracket. 3. Locate the PK wire, labeled FUSE BLOCK IGN and connect this wire to a SINGLE SOURCE which will have 12 volts when the key is in both the Start (cranking) AND in the Run positions. This is the primary circuit which will provide power to all of the relays and to the ignition system. If this wire is connected correctly, the Check Engine light will come on when the ignition is in the Run and Start positions. 4. If you are using a 4L60E Automatic, locate the OG/BK and BK/WH wires labeled GEAR IND SWITCH. These two wires are for the Park/Neutral Indicator switch, NOT for the Neutral Start Safety Switch. If you are using a GM steering column, you can use the Delco combination switch #D22286A and wire it as described in Steps 5 and 6 below. The OG/BK wire must be grounded in Park and Neutral and ungrounded in Drive. 5. If you use the Delco combination switch as a gear indicator switch for the computer only, attach the BK/WH and OG/BK wires to the pins in the switch as shown in Figure 1 Illustration A below. 7

8 6. If you would also like to use the Delco combination switch to power reverse lights and function as a neutral start safety switch in addition to the gear indication, you should wire the combination switch exactly as shown in Figure 1 Illustration B below. Figure 1 GM Column Combination Switch 7. You may use your own toggle switch or switch on the parking brake instead of the Delco combination switch. Connect the OG/BK wire to ground ONLY when the car is in PARK OR NEUTRAL. When using your own switch, the BK/WH wire may or may not be used at the installer s discretion as the other end of the BK/WH wire is grounded through the EFI harness. NOTE: If you are using a manual transmission, you will not be using the OG/BK and the BK/WH wires and you should ignore Steps 4-7. Both wires should be taped and stowed out of sight and away from potential hazards to the wires. 8. Locate the VT and PK wires labeled BRAKE SWITCH. When these wires are connected to the harness, the computer is signaled when the brakes are applied. The PK wire provides power to the switch and the VT wire provides the signal returning to the computer. 8

9 9. If you are using a plunger style brake switch to actuate your brake lamps, wire the VT and PK wires according to Figure 2 below. The PK wire will have 12 volts at all times with the ignition on. Figure 2 Wiring for Plunger Type Brake Switch 10. If you are using a pressure style brake switch, you must use a 30 amp relay wired as shown in Figure 3 below. Figure 3 Wiring for Pressure Type Brake Switch NOTE: If you are using a manual transmission, you will not be using the VT and PK wires and you should ignore Step 8. Both wires should be taped and stowed out of sight and away from potential hazards to the wires. CAUTION FAILURE TO WIRE THE VT AND PK WIRES CORRECTLY IF USING A 4L60E AUTOMATIC WILL RESULT IN DANGEROUS SITUATION ON THE VEHICLE! 11. Locate the GY wire labeled FUEL TEST. This is a test wire for the fuel pump and will not be used after the vehicle has been wired and tested OK. This test wire will be taped and stowed out of sight and away from potential hazards after initial troubleshooting is completed. 12. Locate the DB, RD and BK wires labeled VATS. These wires are to be connected to the corresponding wires in the stand-alone Summit VATS module (sold separately). As an alternative to buying the stand-alone VATS module, you may also have the factory EFI computer recalibrated to remove VATS. 13. Locate the DG wire labeled FAN #1 RELAY and the DB wire labeled FAN #2 RELAY. These are trigger wires for the Low Temp (FAN #1) and High Temp (FAN #2) fans which are controlled by the EFI computer. The Low Temp fan comes on at 226 degrees F and goes off when engine coolant temps fall below 217 degrees F. The High Temp fan comes on at 235 degrees F and goes off when engine coolant temps fall below 226 degrees F. 9

10 CAUTION A 40 AMP RELAY SHOULD BE USED TO POWER FAN #1 AND A SEPARATE 40 AMP RELAY SHOULD BE USED TO POWER FAN #2. THE DG AND DB WIRES ARE TRIGGER WIRES FOR THESE RELAYS ONLY AND SHOULD NOT BE USED TO POWER AN ELECTRIC FAN DIRECTLY. 14. Locate the WH wire labeled TACH. This is the signal wire for a tachometer if desired. 15. Locate the DG/WH wire labeled VSS OUTPUT. This is the signal wire for a speedometer or electronic cruise control if desired. 16. Locate the WH/BK wire labeled SKIP SHIFT LIGHT. This wire is only for T56 manual transmission equipped vehicles and can be wired to a skip shift light if desired. 17. Locate the 4 pin relay connector labeled FUEL RELAY. Plug the fuel pump relay (Delco # ) into this connector and permanently mount the relay under the dash panel. 10

11 ENGINE COMPARTMENT INSTALLATION The engine harness is separated into the left side (driver s side) section, right side (passenger s side) section and 11 additional circuits. The left side of the engine has connectors for all odd numbered injectors, left side coils, engine coolant temp sensor (ECT), throttle position sensor (TPS) and idle air control (IAC). The right side of the engine has connectors for all even numbered injectors and right coils. In addition to the left and right sections, there are also connectors for the knock sensor, intake air temp (IAT), Mass air flow (MAF), cam position (CMP), manifold absolute pressure (MAP) and crank position (CKP) included in the engine compartment harness section. Three ring terminals for the EFI harness ground point at the back of the engine and the two ring terminals for the starter also need to be connected to complete all connections in the engine compartment. 1. Locate the left (driver s) side section of the engine compartment harness and plug in the four odd numbered injector connectors labeled INJ #1, INJ #3, INJ #5 and INJ #7 into the appropriate injectors. Left Hand Injectors 2. Plug in the left (driver) side coil connector labeled DRIVER COILS. Left Hand Coil Pack 11

12 3. Plug in the connector for the engine coolant temp sensor labeled ECT. Engine Coolant (ECT) Sensor 4. Plug in the connector for the throttle position sensor labeled TPS. Throttle Position (TP) Sensor 5. Plug in the connector for the idle air control motor labeled IAC. Idle Air Control (IAC) Motor 12

13 6. Locate the right (passenger s) side section of the engine compartment harness. 7. Plug in all four even numbered injector connectors labeled INJ #2, INJ #4, INJ #6 and INJ #8 into the appropriate injectors. Right Hand Injectors 8. Plug in the right (passenger) side coil connector labeled PASS COILS. Right Hand Coil Pack 9. Locate the connector labeled KNOCK and plug into the knock sensor located on the left rear corner of the intake manifold. Knock Sensor 13

14 10. Locate the connector labeled IAT and plug into the intake air temp sensor located in the air cleaner assembly. Intake Air Temp (IAT) Sensor 11. Locate the connector labeled MAF and plug into the mass air flow sensor located ahead of the throttle body. Mass Airflow (MAF) Sensor 12. Locate the connector labeled CMP and plug into the cam position sensor located at the rear of the intake manifold. 14

15 Camshaft Position (CMP) Sensor 13. Locate the connector labeled MAP and plug into the manifold absolute pressure sensor located at the rear of the intake manifold. Manifold Air Pressure (MAP) Sensor 14. Locate the connector labeled CKP and plug into the crank position sensor located just above the starter in the block. Crankshaft Position (CKP) Sensor 15. Connect the two ring terminals attached to the RD wires labeled STARTER B+ to the large battery terminal on the starter solenoid. 16. Connect the three ring terminals with the BK and BK/WH wires to a ground point on the rear of the engine block. 17. Run a 4 ga wire from this ground point on the rear of the engine block directly to battery negative. 18. Verify that there is a ground strap from the engine to the vehicle chassis. If a ground strap does not exist, add one at this time. 15

16 TRANSMISSION TUNNEL INSTALLATION The tunnel harness has connectors for left and right hand oxygen sensors, the vehicle speed sensor (VSS) connector, a GY wire for the fuel pump, a 13 pin 4L60E transmission connector and two connectors for the T-56 manual transmission, a reverse lockout solenoid connector and a skip shift solenoid connector. 1. Locate the connector labeled DRIVER SIDE OXY and plug the connector into the left (driver) side oxygen sensor. 2. Locate the connector labeled PASS SIDE OXY and plug the connector into the right (passenger) side oxygen sensor. NOTE: This harness only has provisions to support one oxygen sensor per side. If you are using a catalyst-equipped exhaust pipe that has oxygen sensors also installed inside or after the catalytic converters, please insure that the oxygen sensor connectors included with this EFI harness are plugged into the oxygen sensors BEFORE the catalytic converters. These pre-catalyst oxygen sensors are used by the computer to determine the rich/lean condition of the engine mixture and adjust the fuel mixture accordingly. 3. Locate the connector labeled VSS and plug the connector into the vehicle speed sensor. The VSS is located on the left rear side of the T-56 manual transmission and on the right rear side of the 4L60E automatic transmission. Vehicle Speed (VSS) Sensor (4L60E) 4. Locate the connector labeled TRANS. If you are using the 4L60E automatic, plug this connector into the transmission connector on the right hand side of the transmission case just above the pan. If you are using a T-56 manual, tape up the branch of wires leading to the 13-pin TRANS connector and store it in the harness. Transmission Connection (4L60E) 16

17 5. Locate the connectors labeled REVERSE LOCKOUT SOL and SKIP SHIFT SOL. If you are using a T-56 manual, Plug the connectors into the reverse lockout solenoid (left rear side of the trans) and the skip shift solenoid (left center side of the trans). If you are using a 4L60E automatic, tape up the branch of wires leading to the reverse lockout and skip shift solenoid connectors and store them in the harness. Transmission Connections (T-56) 6. Route the GY wire to the fuel pump being certain to keep it clear from the exhaust system or any moving parts or hazards. This is the power wire for the fuel pump. 17

18 COMPUTER INSTALLATION 1. Make sure the ignition is off to prevent damage the computer or sensors. 2. Attach the connectors to the re-calibrated EFI computer under the dash panel inside the vehicle. Use extreme caution to not bend the pins in the factory EFI computer. 3. After all the connections have been made through the harness, the battery can be connected to the vehicle. 4. Start the vehicle if all other systems (fuel system, brakes, charging system, etc.) have been completed and verified as safe and functional. CAUTION BE SURE THE IGNITION IS OFF WHEN YOU RECONNECT THE BATTERY OR YOU MAY DAMAGE THE COMPUTER AND SENSORS!!! TROUBLESHOOTING If you are having trouble and your engine is running badly or not running at all, first insure that you are using the correct parts as referenced in Table 1 of this installation manual. Next, check for faulty connections, blown fuses, proper connection of the VATS module (if installed), spark, timing and fuel pressure. Check to see if the computer has stored a trouble code in it s memory. Figure 5 Fuse Panel Identification CHECK ENGINE LIGHT Normally, the Check Engine light should illuminate when the engine is turned on but the engine is not running. After starting the engine, the Check Engine light will run for a few seconds and then go out. If it reappears or stays on while the engine has been running, the computer has detected a fault and a Default Trouble Code (DTC) has been set and stored in the computer s memory. OBTAINING DTCs FROM THE COMPUTER 1. Identify the found code to those listed in the DTC table (Table 3) to determine which circuit the 18

19 computer has detected the problem is in. Keep in mind, a DTC does not necessarily identify a faulty part, but rather a problem with that particular circuit, which may or may not be caused by a bad part. 2. Before performing any extensive corrective actions for any trouble codes, make sure that all connections on the indicated circuit INCLUDING THE COMPUTER are clean and tight. Inspect the wiring in the circuit for any broken, shorted or exposed wires and insure all ground wires are clean and secure. 3. If a trouble code is detected and the problem has been corrected, clear the codes by first making sure the ignition is off then disconnecting the NEGATIVE battery terminal for a minimum of 3 minutes. Table 3 DTC Codes Diagnotic Specific Problem Circuit Trouble Code (DTC) DTC 11 DTC 13 DTC 14 DTC 15 DTC 16 DTC 18 DTC 21 DTC 22 DTC 23 DTC 24 DTC 25 DTC 26 DTC 27 DTC 28 DTC 29 DTC 32 DTC 33 DTC 34 Malfunction Indicator Lamp Bank 1 (left) Heated Oxygen Senor (HO2S) Open Circuit Engine Coolant Temperature (ETC) Sensor Circuit (Signal Voltage Low) Overheated Engine Coolant Temperature (ETC) Sensor Circuit (Signal Voltage High) Engine cold Distributor Ignition System (Low Resolution Pulse) Injector Circuits Throttle Position (TP) Sensor Circuit (Signal Voltage High) Throttle Position (TP) Sensor Circuit (Signal Voltage Low) Intake Air Temperature (IAT) Sensor Circuit (Signal Voltage High) Cold Intake Air Vehicle Speed Sensor (VSS) Circuit Intake Air Temperature (IAT) Sensor Circuit (Signal Voltage Low) Hot Intake Air Evaporative Emission (EVAP) Canister Purge Solenoid Valve Circuit Exhaust Gas Recirculation (EGR) Vacuum Control Solenoid Valve Circuit Transmission Range (TR) Pressure Switch Assembly Fault Secondary Air Injection (AIR) Pump Circuit Exhaust Gas Recirculation (EGR) Manifold Absolute Pressure (MAP) Sensor Circuit (Signal Volts High, Low Vacuum) Manifold Absolute Pressure (MAP) Sensor Circuit (Signal Volts Low, High Vacuum) 19

20 DTC 36 DTC 37 DTC 38 DTC 41 DTC 42 DTC 43 DTC 44 DTC 45 DTC 46 DTC 47 DTC 48 DTC 50 DTC 51 DTC 53 DTC 55 DTC 58 DTC 59 DTC 61 DTC 63 DTC 64 DTC 65 DTC 66 DTC 67 DTC 68 DTC 69 DTC 70 DTC 71 DTC 72 Distributor Ignition System (Faulty High or Extra Low Resolution Pulse Detected) Brake Switch Stuck ON Brake Switch Stuck OFF Ignition Control (IC) Circuit (Open Circuit) Ignition Control (IC) Circuit (Shorted or Grounded Circuit) Knock Sensor (KS) Circuit Bank 1 (Left Heated Oxygen Sensor (HO2S) Circuit (Lean Exhaust Indicated) Bank 1 (Left Heated Oxygen Sensor (HO2S) Circuit (Rich Exhaust Indicated) Pass-Key Circuit Knock Sensor (KS) Module Circuit or Module Missing Mass Air Flow (MAF) Sensor Circuit System Voltage Low EEPROM Programming Error System Voltage High Fuel Lean Monitor Transmission Fluid Temperature (TFT) Sensor Circuit Low (High Temp Indicated) Transmission Fluid Temperature (TFT) Sensor Circuit Low (Low Temp Indicated) A/C System Performance Bank 2 (Right) Heated Oxygen Sensor (HO2S) Circuit (Open Circuit) Bank 2 (Right) Heated Oxygen Sensor (HO2S) Circuit (Lean Exhaust Indicated) Bank 2 (Right) Heated Oxygen Sensor (HO2S) Circuit (Rich Exhaust Indicated) A/C Refrigerant Pressure Sensor Circuit (Open or Shorted) A/C Refrigerant Pressure Sensor Circuit (Pressure Sensor or A/C Clutch Problem) A/C Relay Circuit (Shorted Circuit) A/C Clutch Circuit A/C Clutch Relay Driver Circuit A/C Evaporator Temperature Sensor Circuit (Open or Shorted) Vehicle Speed Sensor Loss (Automatic Transmissions Only) 20

21 DTC 73 DTC 74 DTC 75 DTC 77 DTC 79 DTC 81 DTC 82 DTC 83 DTC 83 DTC 84 DTC 84 DTC 85 DTC 90 DTC 91 DTC 97 DTC 99 Pressure Control Solenoid (PCS) Circuit (Current Error) Traction Control Circuit (TCS) Circuit Low Transmission System Voltage Low Cooling Fan Relay Control Circuit Transmission Fluid Temperature Too HIgh Transmission 203 Shift Solenoid Circuit Transmission 1-2 Shift Solenoid Circuit Reverse Inhibit System (Manual Transmission) TCCPWM Solenoid Circuit Fault (Automatic Transmission) Automatic Transmission 3-2 Control Solenoid Circuit Skip Shift Solenoid Circuit (Manual Transmission) Transmission TCC Stuck ON Transmission TCC Solenoid Circuit (Manual Transmission) Skip Shift Lamp Circuit VSS Output Circuit Tach Output Circuit 21