SIMPLIFIED TEST EQUIPMENT F O R INTERNAL COMBUSTION ENGINES REPROGRAMMABLE (STE/ICE-R)

Transcription

1 TM 09109A-24/4 OPERATING PROCEDURES MANUAL SIMPLIFIED TEST EQUIPMENT F O R INTERNAL COMBUSTION ENGINES REPROGRAMMABLE (STE/ICE-R) AS APPLICABLE TO CRANE, HIGH SPEED, HIGH MOBILITY HSHMC-25 AUGUST 1992 PCN

2 WARNINGS WARNING Vehicle engine must be off before installing cables to prevent injury to personnel or damage to equipment. WARNING Do not have a battery charger connected when performing electrical system tests. WARNING On vehicles with a master switch in the negative (-) battery cable, sparking may occur if the VTM case touches the vehicle while master switch is off and VTM is on. Sparking in the presence of fuel or fuel vapors presents a potential hazard. Avoid hazard by doing all testing with the vehicle in a well ventilated area.

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4 TABLE OF CONTENTS PAGE SECTION I. INTRODUCTION Description General Measurements SECTION II. STE/ICE POWER CONNECTION General Cable Installation Vehicle Test Cards Test 66 - Confidence Test SECTION III. DIAGNOSTIC CONNECTOR ASSEMBLY TESTS General Test 10 - Engine Idle Speed Test 12 -Engine Power Test Test 67- Battery Voltage Test Test 68- Starter Voltage Test Test 70- Starter Solenoid Voltage Test 71- Average Starter Current Test 72- Starter Current, First Peak Test 74 -Starter Circuit Resistance Test 73- Battery Internal Resistance Test 82- Alternator Output Voltage Test 84- Alternator Negative Cable Voltage Drop Test 67 - Cranking Voltage Test 24- Fuel Supply Pressure Test 26 - Fuel Filter Restriction Test 27 - Fuel Solenoid Voltage Test 10 - Vehicle Cranking Speed Test 75 - Battery Internal Resistance Change Test 69 - Engine Ground Test 80 - Battery Current Test Results SECTION IV. TEST KIT (TK MODE) TESTS General Test 50 - Engine Oil Pressure Test Results

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6 Section I. INTRODUCTION 1-1. DESCRIPTION a. The Simplified Test Equipment for Internal Combustion Engines (hereafter referred to as STE/ICE) performs many tests on internal combustion engines. Engine power, electrical tests, and pressure tests can be performed without the need of other special test equipment. b. The major components of the STE/ICE and their uses are listed below. Refer to Figure 1-1. (1) Vehicle Test Meter (VTM) - used to test vehicle/equipment (3) Cable Assemblies - used to supply operating power and test data to the VTM. Cable assemblies are referenced by cable number and by name which tells how the cable is used. The following cables are used to test the HSHMC-25 crane. (a) W1 Cable - connects to receptacle mounted in vehicle cab and to J1 (DCA/PWR) on VTM. Connects VTM to STE/ICE Diagnostic Connector Assembly of crane. Supplies battery power to VTM. (b) W4 Cable - connects to J2 TK receptacle on VTM and to transducer at test site. (2) Transit Case - a fitted carrying case used to transport all items of the STE/ICE. Figure 1-1. STE/lCE Components 1-1

7 (4) Transducer Kit - contains transducers, adapters, and current probe. Used to connect VTM to vehicle for testing in the TK mode. The following transducers and adapters are used to test the HSHMC-25. (a) Transducer - blue striped, transducer kit item 17, part number (a, Figure 1-2). The blue transducer is used to check pressures in excess of 25 psi. (b) Adapter - transducer kit item 20, part number (b, Figure 1-2). Used to connect transducer to 1/8 inch plug hole in oil pressure connections. (c) Snubber - transducer kit item 21, part number (c, Figure 1-2). Used with blue striped transducer to prevent and reduce pulsations caused by high pressure fluid GENERAL MEASUREMENTS (2) The tests included in this supplement include procedures for each of the measurements. b. Measurement Table (1) Table 1-1 lists the STE/ICE general measurements applicable to the HSHMC crane. (2) General measurements are separated between the Diagnostic Connector Assembly (DCA) mode and the Test Kit (TK) mode. (3) The DCA mode tests read measurements supplied by the Diagnostic Connector Assembly mounted on the vehicle Refer to Figure 1-3. (4) TK mode tests require the installation of transducers and connection of a cable to the Vehicle Test Meter. a. General (1) General measurements are those for which the VTM does not require a vehicle identification number in order to conduct the measurements. These include voltage, pressure, current, and resistance. Figure 1-2. Transducer Kit 1-2

8 TABLE 1-1. GENERAL MEASUREMENTS TEST MODE TEST NO. 10 MACHINE FUNCTION Engine Idle Speed I MEASURED ACCEPTABLE VALUE RANGE I 690 to 875 rpm 12 Engine Power 2900 to 3200 rpm/sec 67 Battery Voltage 24.5 to 28.5 volts 68 Starter Voltage minimum 19.0 volts 70 Starter Solenoid Voltage minimum 19.0 volts 71 Average Starter Current maximum 360 amps DCA 72 Starter Current, First Peak 74 Starter Circuit Resistance 73 Battery Internal Resistance 82 Alternator Output Voltage 84 Alternator Negative Cable Voltage Drop 67 Cranking Voltage I 24 Fuel Supply Pressure 26 Fuel Filter Restriction 27 Fuel Solenoid Voltage maximum 1500 amps maximum 27 milliohms maximum 25 milliohms 26.5 to 28.5 volts maximum 0.4 volts minimum 19.0 volts 18 to 35 psi PASS 25 to 29 volts I 10 Vehicle Cranking Speed 75 Battery Internal Resistance Change 69 Engine Ground minimum 120 rpm maximum 50 milliohm/sec maximum 0.4 volts 80 Battery Current 250 to 500 amps TK 50 Engine Oil Pressure I 55 to 80 psi 1-3

9 1-4 Figure 1-3. Carrier and Instrument Panel

10 Section II. STE/ICE POWER CONNECTION 2-1. GENERAL a. Park HSHMC-2S crane on level ground or floor. b. Perform the following steps before installing STE/ICE: (1) Operate crane and lower boom onto boom rest. Engage house lock. (2) Set the swing brake. Set all drum pawls. Engage parking brake. CAUTION If operating crane indoors, connect metal tubing to exhaust stack to deliver exhaust gases to outside area. (3) Shut off engine CABLE INSTALLATION a. Remove cable assembly W1 from transit case. b. Remove Vehicle Test Meter from transit case and place on suitable stand. CAUTION Do not connect cable to VTM when VTM power switch is on. c. Connect cable W1 to J1 DCA/PWR connector on VTM. Refer to Figure 2-1. d. Refer to Figure 2-2 and connect cable W1 to DCA mounted on vehicle Twist locking ring to secure cable. WARNING On vehicles with a master switch in the negative (-) battery cable, sparking may occur if the VTM case touches the vehicle while the master switch is off and the VTM is on. Sparking in the presence of fuel or fuel vapors presents a potential hazard. Avoid hazard by doing all testing in a well ventilated area. e. Turn master switch on. f. Check that power is present at VTM. (1) PUSH ON VTM power switch. Refer to Figure 2-3. Figure 2-1. Cable Connection to VTM 2-1

11 Figure 2-2. Cable WI Connected to DCA Figure 2-3. VTM Components 2-2

12 (2) Observe VTM display. (3) Verify that the figures appear on the display for approximately 2 seconds and then change to This sequence assures that power is present at VTM VEHICLE TEST CARDS a. The Vehicle Test Card is intended as a quick reference for personnel already familiar with STE/ICE operation. The Test Card provides connection information for the most common VTM tests on the vehicle. b. The card contains all information, in abbreviated format, needed to perform common measurements. c. Included on the card are the following: (1) (2) the crane. (3) VTM power up sequence. List of measurements used in troubleshooting Operating conditions. (5) Minimum and maximum measurement limits. d. The Text Card listing allows measurements with the crane engine turned off to be performed first. The remaining measurements are organized as follows: (1) Measurements requiring engine to be cranking but not running. (2) Measurements with the engine running but not warm. (3) Measurements requiring engine to be warm and running TEST 66- CONFIDENCE TEST NOTE This test is designated as Test 66. The procedure provides an overall check of the VTM. The test should be performed before and after each measurement to ensure accuracy of results. (4) Connections required. Figure 2-4. Confidence Test in Program 2-3

13 a. Refer to paragraph 2-2 and check that power is present at the VTM. b. Set TEST SELECT switches to 66. c. Refer to Figure 2-4 and press TEST button. Wait for display to show d. Set TEST SELECT switches to 99. e. Press and release TEST button. Display should show Display will then turn blank. NOTE When performing step e, observe and verify that all segments of the display are on. f. The display will show This indicates all segments are operating. g. The display will turn blank. NOTE If a test is in progress, the test results will appear in the display window. The end result of the confidence test will alternately show the software revision number and the PASS message. h. Refer to Figure 2-5 for confidence test display. Wait for the alternate display of the revision number and PASS message. i. PULL OFF button to shut off VTM. Figure 2-5. Confidence Test Display 2-4

14 Section III. DIAGNOSTIC CONNECTOR ASSEMBLY TESTS 3-1 GENERAL NOTE To perform the following tests, a minimum of two personnel is suggested. a. The following tests are performed in the DCA mode. b. Refer to paragraph 2-2 and check to be sure the VTM is connected to the DCA connector. c. Refer to paragraph 2-4 and test prior to each DCA mode test. d. VTM must be connected perform all of the following tests. perform the confidence to DCA connector to 3-2. TEST 10 - ENGINE IDLE SPEED a. General. This test measures engine speed while the crane idles. b. Test procedures (1) Make sure VTM is off. PULL OFF VTM power switch. (2) Check to see that cable W1 is attached to J1 connector on VTM and to DCA connector on the vehicle (3) Refer to paragraph (4) Turn on vehicle master Apply service brakes. 2-4 and perform the switch and start engine. Figure 3-1. VTM Settings for Engine Idle Speed Test 3-1

15 (5) Set TEST SELECT switches to 10. NOTE (6) PUSH ON button to power VTM. Wait for VTM to display (7) Press and release TEST button. (8) Observe display while engine idles. Reading should be 690 to 875 RPM. Two numbers will be displayed. The first number will go away after a few seconds. The second number is the test result. This number will remain on VTM display. (9) Observe display. Reading should be 2900 to 3200 rpm/sec. (9) Shut Off engine. (10) Allow engine to idle at least 2 minutes. (10) PULL OFF button to shut off VTM. (11) Shut off engine TEST 12- ENGINE POWER TEST (12) PULL OFF button to shut off VTM. a. General. This test measures engine power at full throttle. b. Test procedures (2) Check to see that cable W1 is connected to J1 connector at VTM and to DCA on vehicle (3) Refer to paragraph 2-4 and perform the (4) Turn on vehicle master switch and start engine. Apply service brakes. Allow engine to reach operating temperature before proceeding to step TEST 67- BATTERY VOLTAGE TEST a. General. This test measures battery voltage. Voltage is measured directly at the power source of the VTM. (2) Check to see that cable W1 is connected to J1 connector at VTM and to DCA connector on vehicle test. (3) Refer to paragraph 2-4 and perform confidence (5) Set TEST SELECT switches to 12. (4) Make sure vehicle master switch and all vehicle accessories are off. (6) PUSH ON button to power VTM. Wait for VTM to display (5) Set TEST SELECT switches to 67. (7) Press and release TEST button. (6) PUSH ON button to power VTM. Wait for VTM to display (8) When VTM displays CIP, press down sharply on engine accelerator and hold pedal to the floor. When VTM displays a number, release accelerator. CAUTION (7) Press and release TEST button. (8) Observe display. Reading should be 24.5 to 28.5 Volts. Allow engine to idle for at least 2 minutes after running engine power test to prevent damage to vehicle. (9) PULL OFF button to shut off VTM. 3-2

16 3-5. TEST 68- STARTER VOLTAGE TEST a. General. This test checks the voltage of the starter motor while cranking the engine. (2) Check to see that cable W1 is connected to J1 (3) Refer to paragraph 2-4 and perform the (4) Make sure master switch and all vehicle accessories are off. (5) Set TEST SELECT switches to 68. (6) PUSH ON button to power VTM. Wait for VTM to display (7) (8) seconds. (9) 19.0 volts. (l0) Press and release TEST button. Depress starter button and engage starter for 3 Observe display. Reading should be at least PULL OFF button to shut off VTM TEST 70 - STARTER SOLENOID VOLTAGE a. General. This test provides a check of the voltage at the starter solenoid while cranking the engine. (2) Check to see that cable W1 is connected to J1 (3) Refer to paragraph 2-4 and perform the (4) Make sure master switch and all vehicle accessories are off. (5) Set TEST SELECT switches to 70. (6) PUSH ON button to power VTM. Wait for VTM to display (7) (8) seconds. (9) 19.0 volts. (l0) Press and release TEST button. Depress starter button and engage starter for 3 Observe display. Reading should be PULL OFF button to shut off VTM. at least 3-7. TEST 71 - AVERAGE STARTER CURRENT a. General. This test measures average starter current while cranking the engine. b. Test procedures (2) Check to see that cable W1 is attached to J1 (3) confidence (4) Refer to paragraph 2-4 and perform the test. Perform offset test as follows: (a) Ensure vehicle master switch is off. (b) Set TEST SELECT switches to 71. (c) PUSH ON button to power VTM. Wait for VTM to display (d) Press and hold TEST button until the letters CAL appear on display. (e) Release TEST button, Observe display. Reading should be between -150 and (5) Press and release TEST button. (6) Depress starter for 3 seconds then disengage. 3-3

17 (7) Observe display. Reading should be less than 360 amps. (8) PULL OFF button to shut off VTM TEST 72- STARTER CURRENT, FIRST PEAK a. General. This test measures the overall condition of the complete starting system. (2) Check to see that cable W1 is connected to J1 (3) Refer to paragraph 2-4 and perform the (4) Perform offset test as follows: (8) PULL OFF button to shut off VTM TEST 74 - STARTER CIRCUIT RESISTANCE a. General. This test measures starter circuit resistance. (1) Refer to Figure 2-3 for VTM cable connections. (2) Check to see that cable W1 is attached to J1 (3) Refer to paragraph 2-4 and perform the (4) Perform offset test as follows: (a) Make sure vehicle master switch and all vehicle accessories are off. (a) Ensure vehicle master switch is off. (b) Set TEST SELECT switches to 74. (b) Set TEST SELECT switches to 72. (c) PUSH ON button to power VTM. Wait for VTM to display (d) Press and hold TEST button until the letters CAL appear on display. (e) Release TEST button. Observe display. Reading should be between -150 and (c) PUSH ON button to power VTM. Wait for VTM to display (d) Press and hold TEST button until the letters CAL appear on display. (e) Release TEST button. Observe display. Reading should be between -150 and (5) Press and release TEST button. (5) Press and release TEST button. NOTE NOTE Never engage starter for longer than 3 seconds. If the letters GO appear and Never engage starter for longer than 3 remain on display, a battery may be bad. seconds. If the letters GO appear and Check and replace battery if necessary. remain on display, a battery may be bad. Check and replace battery if necessary. (6) When GO appears on the display, depress starter button and engage starter for 3 seconds, or until the letters OFF appear on display. Disengage starter. (6) When GO appears on the display, depress stinter for 3 seconds, or until the letters OFF appear on display. Disengage starter. (7) Observe display. Reading should be less than 27 milliohms. (7) Observe display. Reading should be less than 1500 amps. (8) PULL OFF button to shut off VTM. 3-4

18 3-10. TEST 73 - BATTERY INTERNAL RESISTANCE a. General. This test measures the state of charge of the batteries. (2) Check to see that cable W 1 is attached to J1 (3) Refer to paragraph 2-4 and perform the (4) Perform offset test as follows: (a) Make sure vehicle master switch and all vehicle accessories are off. (b) Set TEST SELECT switches to 73. (c) PUSH ON button to power VTM. Wait for VTM to display (d) Press and hold TEST button until the letters CAL appear on display. (e) Release TEST button. Observe display. Reading should be between -150 and (5) Press and release TEST button. NOTE Never engage starter for longer than 3 seconds. If the letters GO appear and remain on display, a battery may be bad. Check and replace battery if necessary. (6) When GO appears on the display, depress starter button and engage starter for 3 seconds, or until the letters OFF appear on display. Disengage starter. (7) Observe display. Reading should be less than 25 milliohms. (8) PULL OFF button to shut off VTM TEST 82- ALTERNATOR OUTPUT VOLTAGE a. General. This test checks alternator output voltage while the engine is running and accessories are on. This test alternately displays engine speed and output voltage. (2) Check to see that cable W1 is attached to J1 (3) Refer to paragraph 2-4 and perform the (4) Turn on master switch, vehicle lights, and heater fan. (5) Set TEST SELECT switches to 01. (6) PUSH ON button to power VTM. Wait for VTM to display (7) Press and release TEST button. (8) Wait for VTM to display Con. (9) Perform output voltage test as follows: (a) Set TEST SELECT switches to 82. (b) Press and release TEST button. (c) Start engine. Apply service brakes. NOTE VTM will alternately display engine speed and alternator output voltage. (d) Observe VTM display. Increase engine speed to 1500 RPM. (e) With engine running at 1500 RPM, observe VTM display. Alternator output voltage reading should be between 26.5 and 28.5 volts. 3-5

19 (10) Shut off engine. Turn off lights and heater fan. (11) PULL OFF button to shut off VTM TEST 84 - ALTERNATOR NEGATIVE CABLE VOLTAGE DROP a. General. This teat checks the negative cable voltage drop of the alternator while the engine is running and accessories are on. This test alternately displays engine speed and alternator negative cable voltage drop. (2) Check to see that cable W1 is attached to J1 connector on VTM and to DCA on vehicle instrument panel. (3) Refer to paragraph 2-4 and perform the (4) Turn on master switch, vehicle lights and heater fan. (5) Set TEST SELECT switches to 01. (6) PUSH ON button to power VTM. Wait for VTM to display (e) With engine running at 1500 RPM, observe VTM display. Alternator negative cable voltage drop should be no greater than 0.4 volts. (10) Shut off engine. Turn off lights and heater fan. (11) PULL OFF button to shut off VTM TEST 67- CRANKING VOLTAGE a. General. This test provides a check of the battery voltage while cranking the engine. (2) Check to see that cable W1 is connected to J1 (3) Refer to paragraph 2-4 and perform the (4) Make sure vehicle master switch is off. (5) Set TEST SELECT switches to 67. (6) PUSH ON button to power VTM. Wait for VTM to display (7) Press and release TEST button. (7) Press and release TEST button. (8) Wait for VTM to display Con. (9) Perform alternator negative cable voltage drop test as follows: (a) (b) (c) Set TEST SELECT switches to 84. Press and release TEST button. Start engine. Apply service brakes. NOTE VTM will alternately display engine speed and alternator negative cable voltage drop. (d) Observe VTM display. Increase engine speed to 1500 RPM. (8) starter. (9) 19.0 volts. (lo) Depress starter for 3 seconds. Disengage Observe display. Reading should be at least PULL OFF button to shut off VTM TEST 24- FUEL SUPPLY PRESSURE a. General. This test measures fuel supply pressure while the engine idles. 3-6

20 (2) Check to see that cable W1 is connected to J1 (3) Refer to paragraph 2-4 and perform the (4) Perform offset test as follows: (a) Make sure vehicle master switch is off. (b) Set TEST SELECT switches to 2-4. (c) PUSH ON button to power VTM. Wait for VTM to display (d) Press and hold TEST button until the letters CAL appear on display. (e) Release TEST button. Observe display. Reading should be between -4.5 and (5) Press and release TEST button. (6) Turn on master switch and start engine. Apply service brakes. (7) Allow engine to idle 60 seconds and observe VTM display. Reading should be 18 to 35 PSI. VTM. (8) Shut off engine. PULL OFF button to shut off TEST 26- FUEL FILTER RESTRICTION a. General. This test provides a check of the condition of the fuel filter. (2) Check to see that cable W1 is connected to J1 (3) Refer to paragraph 2-4 and perform the (4) Set TEST SELECT switches to 26. (5) PUSH ON button to power VTM. Wait for VTM to display (6) Press and release TEST button. (7) Turn on master switch and start engine. Apply service brakes. (8) While engine idles, observe display. VTM should display PASS. (9) Shut off engine. (10) PULL OFF button to shut off VTM TEST 27- FUEL SOLENOID VOLTAGE a. General. This test measures voltage at the fuel solenoid. (1) Check voltmeter reading to ensure batteries are charged (refer to Figure 1-2). (2) Refer to Figure 2-3 for location of VTM (3) Check to see that cable W1 is connected to J1 (4) Refer to paragraph 2-4 and perform the (5) Set TEST SELECT switches to 27. (6) PUSH ON button to power VTM. Wait for VTM to display (7) Press and release TEST button. (8) Turn on master switch and start engine. Apply service brakes. (9) Allow engine to idle for 60 seconds and observe VTM display. Reading should be 25 to 29 volts. (10) Shut off engine. (11 ) PULL OFF button to shut off VTM TEST 10- VEHICLE CRANKING SPEED a. General. This test measures engine speed while cranking the engine. 3-7

21 for VTM to display (1) Make sure vehicle master switch is off. (d) Press and hold TEST button until the letters CAL appear on display. (2) Refer to Figure 2-3 for location of VTM (3) Check to see that cable W1 is attached to J1 (e) Release TEST button. Observe display. Reading should be between -150 and (5) Press and release TEST button. NOTE (4) Refer to paragraph 2-4 and perform the Never engage starter for longer than 3 seconds. If the letters GO appear and (5) Set TEST SELECT switches to 10. remain on display, a battery may be bad. Check and replace battery if necessary. (6) PUSH ON button to power VTM. Wait for VTM to display (7) Press and release TEST button. (6) When GO appears on the display, depress starter for 3 seconds, or until the letters OFF appear on display. Disengage starter. (8) Depress starter button and engage starter for 2 seconds. Disengage starter. (9) Observe display. Reading should be at least 120 RPM. (10) PULL OFF button to shut off VTM TEST 75 - BATTERY INTERNAL RESISTANCE CHANGE a. General. This test measures the rate of change of battery resistance. (7) Observe display. Reading should no greater than 50 milliohms/sec. (8) PULL OFF button to shut off VTM TEST 69- ENGINE GROUND a. General. This test checks the condition of the electrical system while cranking the engine. (1) Make sure vehicle master switch is off. (2) Check to see that cable W 1 is attached to J1 (2) Refer to Figure 2-3 for location of VTM (3) Check to see that cable W1 is attached to J1 (4) Refer to paragraph 24 and perform the (3) Refer to paragraph 2-4 and perform the (5) Set TEST SELECT switches to 69. (4) Perform offset test as follows: (6) PUSH ON button to power VTM. Wait for VTM to display (a) Make sure vehicle master switch is off. (7) Press and release TEST button. (b) Set TEST SELECT switch to 75. (8) Depress starter for 3 seconds then disengage. (c) PUSH ON button to power VTM. Wait 3-8

22 (9) Observe display. Reading should be no greater than 0.4 volts. (10) PULL OFF button to shut off VTM TEST 80- BATTERY CURRENT a. General. This test measures the strength of the electric current delivered by the batteries. (2) Check to see that cable W1 is attached to J1 (3) Refer to paragraph 2-4 and perform the (4) Make sure vehicle master switch and all vehicle accessories are off TEST RESULTS a. General. Perform my of the above tests as required to check any suspected troubles with the vehicle. b. Disposition. If the results of any of the above tests show discrepancies or do not meet the specifications noted, the object or function should be repaired. Notify the correct echelon of maintenance to perform the repair or replacement required to correct the discrepancy. C. STE/ICE Shutdown (1) Turn off vehicle master switch. PULL OFF button to shut off VTM. (2) Refer to Figure 2-2 and disconnect W1 cable from Diagnostic Connector Assembly. (3) Refer to Figure 2-1 and disconnect cable W1 from VTM. (4) Install cable and VTM in transit case. (5) Perform offset test as follows: (a) Set TEST SELECT switches to 80. (b) PUSH ON button to power VTM. Wait for VTM to display (c) Press and hold TEST button until the letters CAL appear on display. (d) Release TEST button. Observe display. Reading should be between -150 and (6) Press and release TEST button. (7) Depress starter button and engage starter for 3 seconds. Disengage starter. (8) Observe display. Reading should be 250 to 500 amps. (9) PULL OFF button to shut off VTM. 3-9

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24 Section IV. TEST KIT (TK MODE) TESTS 4-1. GENERAL NOTE To perform the following tests, a minimum of two personnel is required. a. TK Mode Tests NOTE Before starting the TK mode tests, turn the master switch on and leave switch on until all tests are completed. (1) The TK mode tests require the installation of transducers at the area to be tested for pressure settings. (2) The TK mode tests require the installation of a cable between the test site and VTM. b. Cable Application (1) The TK mode tests require that cable W1 be connected between the Diagnostic Connector Assembly (DCA) and the Vehicle Test Meter (VTM). (2) Cable W4 from the STE/ICE connects to J2 connector on the VTM and to the transducer at the test site. c. Transducer Application (1) A blue-striped transducer (part number ) is used in the TK mode test for the crane. (2) An adapter (part number ) and snubber (part number ) help connect the transducer at the test site TEST 50- ENGINE OIL PRESSURE a. General. This test measures engine oil pressure at the air compressor while the engine is running. b. Installation and Checks of Test Equipment (1) Refer to Figure 1-3 and remove cap from Diagnostic Connector Assembly. (2) Refer to Figure 2-2 and connect cable W1 to Diagnostic Connector Assembly. (3) Refer to Figure 2-1 and connect cable W1 to connector J1 on the VTM. (4) Refer to paragraph 2-4 and perform the Figure 4-1. Cable Connection at VTM 4-1

25 c. Test Connections (3) Start engine. Engage parking brake. (2) Check to see that cable W1 is connected to J1 (3) Refer to Figure 4-1 and connect W4 cable to J2 connector on VTM. (4) Connect the transducer and W4 cable to the oil pipe plug located near the lower left side of the air compressor. The air compressor is located on the right side of the crane within the engine compartment. Proceed as follows: (a) Connect adapter, part number , to snubber, part number (b) Connect blue striped transducer, part number , to adapter/snubber. (c) Remove the oil passage pipe plug from the air compressor. Refer to Figure 4-2. (d) Install adapter/snubber/transducer in oil port of air compressor. Do not overtighten. (e) Connect W4 cable to transducer in air compressor. d. Test Procedures (1) Perform offset test as follows: (a) Turn engine off. With engine off, system will not be pressurized. (b) Set TEST SELECT switches to 50. (c) PUSH ON button to power VTM. Wait for VTM to display (4) Allow engine to idle 2-3 minutes before performing step 5. (5) While engine idles, observe VTM display. Reading should be 55 to 80 psi. (6) Shut off engine. (7) PULL OFF button to shut off VTM. (8) Refer to Figure 4-2 and disconnect W4 cable from transducer. Disconnect adapter, snubber, and transducer from air compressor. (9) Install pipe plug in air compressor TEST RESULTS a. General. Perform the above test as required to check any suspected troubles with the vehicle. b. Disposition. If the results of the above test show discrepancies or do not meet the specifications noted, the object or function should be repaired. Notify the correct echelon of maintenance to perform the repair or replacement required to correct the discrepancy. C. STE/ICE Shutdown (1) Turn off master switch. (2) Refer to Figure 2-2 and disconnect W1 cable from Diagnostic Connector Assembly. Install cap (Figure 1-3) on Diagnostic Connector Assembly. (3) Refer to Figure 2-1 and disconnect cable W1 from VTM. (4) Install cable, transducers, snubber, adapter, and current probe in transit case. (d) Press and hold TEST button until the letters CAL appear on VTM display. (e) Release TEST button. Wait for offset value to appear on VTM display. Display should read between -150 to (2) Press and release TEST button. 4-2

26 Figure 4-2. Engine Oil Pressure Test 4-3

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