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Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Isuzu Trooper. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform ON-BOARD DIAGNOSTIC II SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD-II system check, go to next step.
  2. Attempt to start engine. If engine starts and runs, go to next step. If engine does not start and run, see ENGINE CRANKS BUT WILL NOT RUN under NO START DIAGNOSIS in BASIC DIAGNOSTIC PROCEDURES article.
  3. Using scan tool, review and record FAILURE RECORDS information. Clear DTC P0337. Start engine and allow it to idle for one minute. On scan tool, monitor DTC information. If DTC P0337 resets, go to next step. If DTC P0337 does not reset, check for an intermittent problem. See DIAGNOSTIC AIDS .
  4. Turn ignition off. Disconnect CKP sensor 3-pin harness connector E-27. Turn ignition on. Connect DVOM between CKP sensor harness connector E-27 terminal No. 1 (Yellow/Red wire) and No. 2 (Green wire). See Fig 1. See WIRING DIAGRAMS article. Voltage reading should be 5 volts. If voltage is as specified, go to step  7. If voltage is not as specified, leave ignition on and go to next step.
  5. Check CKP reference voltage and ground. Backprobing at PCM harness connector, connect DVOM between PCM harness connector E-22 terminal No. 5 (Yellow/Red wire) and PCM harness connector E-21 terminal No. 53 (Green wire). Voltage reading should be 5 volts. If voltage reading is as specified and ground is available at PCM harness connector, go to next step. If voltage is not as specified, go to step  11.
  6. Check for open, short to ground or short to voltage in CKP sensor 5-volt reference and ground circuits between CKP sensor and PCM. If problem is found, repair as necessary. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM.
  7. Turn ignition off. Disconnect PCM Red 80-pin harness connector E-22. PCM is located at right rear of engine compartment. Disconnect Crankshaft Position (CKP) sensor 3-pin harness connector E-27. CKP sensor is located on lower right side of engine. Check for an open or short to ground in 58X reference circuit (Yellow/Red wire) between CKP sensor connector and PCM harness connector. See WIRING DIAGRAMS article. If a problem is found, repair as necessary. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM. If no problem is found, connect PCM and CKP sensor harness connectors and go to next step.
  8. Using DVOM, measure voltage between ground and PCM harness connector E-22 terminal No. 5 (58X reference circuit) while cranking engine. Voltage reading should be about 2.5 volts. If voltage is as specified, go to step  11. If voltage is not as specified, go to next step.
  9. Check for poor, loose or corroded terminals in CKP sensor harness connector. If a problem is found, repair as necessary. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM. If no problem is found, go to next step.
  10. Replace CKP sensor. See ENGINE SENSORS & SWITCHES in REMOVAL, OVERHAUL & INSTALLATION article. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM.
  11. Check for poor, loose or corroded terminals in PCM sensor connectors. If a problem is found, repair as necessary. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM. If no problem is found, go to next step.
  12. Replace and reprogram PCM. See POWERTRAIN CONTROL MODULE REPLACEMENT  under POWERTRAIN CONTROL MODULE. Use scan tool to clear DTC and verify repair.
Fig 1: Identifying Camshaft Position & Crankshaft Position Sensor Harness Connector Terminals
G00077230Courtesy of ISUZU MOTOR CO.
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