Diagnostic Procedures
WARNING: This page is about a different car, the 2000 Isuzu Hombre. However, it is still accessible from the selected car via links, so may be relevant.
- Perform On-Board Diagnostic II (OBD-II) system check. See ON-BOARD DIAGNOSTIC II (OBD-II) SYSTEM CHECK in SELF-DIAGNOSTICS - INTRODUCTION article. After performing OBD-II system check, go to next step.
- Install Tech 2 scan tool. Start engine and allow it to idle. If CMP ACTIVITY counter is incrementing, go to next step. If CMP ACTIVITY counter is not incrementing, go to step 4.
- Turn ignition on, with engine off. Using scan tool, review FREEZE FRAME data, and note parameters. Start engine and operate vehicle within conditions required for setting this DTC, and as close to conditions recorded in FREEZE FRAME as possible. If CMP ACTIVITY counter is incrementing, go to step 13. If CMP ACTIVITY counter is not incrementing, go to next step.
- Turn ignition off. Disconnect CMP sensor connector. With test light connected to ground, probe CMP feed circuit (Red wire) terminal at CMP sensor harness connector. If test light illuminates, go to next step. If test light does not illuminate, go to step 6.
- With test light connected to positive battery terminal, probe CMP ground circuit (Pink/Black wire) terminal at CMP sensor harness connector. If test light illuminates, go to step 7. If test light does not illuminate, go to step 8.
- Check for poor connection at CMP feed circuit (Red wire) at PCM connector. Repair as necessary. After repairs, go to step 13. If connection is okay, go to step 12.
- Turn ignition off. Using appropriate adapter connectors between CMP sensor and CMP harness connector terminals No. "A" and "B" to measure frequency. Remove fuel pump fuse. Using DVOM on Hz scale, measure frequency between ground and terminal No. "C" on CMP harness connector. Crank engine while observing DVOM. If frequency is .5-2.6 Hz, go to step 9. If frequency is not .5-2.6 Hz, replace CMP sensor and go to step 13.
- Check for poor connection or open in CMP ground circuit (Pink/Black wire). Repair circuit as necessary. After repairs, go to step 13. If circuit is okay, go to step 12.
- Disconnect CMP sensor connector. With test light connected to ground, probe CMP signal circuit (Brown/White wire) terminal at CMP sensor harness connector. If test light illuminates, repair Brown/White wire for short to voltage and go to step 13. If test light does not illuminate, go to next step.
- With test light connected to battery voltage, probe CMP signal circuit (Brown/White wire) terminal at CMP sensor harness connector. If test light illuminates, repair Brown/White wire for short to ground and go to step 13. If test light does not illuminate, go to next step.
- Check for poor connection or an open in CMP signal circuit (Brown/White wire). Repair as necessary. After repairs, go to step 13. If circuit is okay, go to next step.
- Replace PCM. Program replacement PCM using required equipment. See PROGRAMMING . After replacing PCM, go to next step.
- Install fuel pump fuse. Connect CMP connector. Using scan tool, select CLEAR INFO or CLEAR DTCS function to clear DTCs. Start engine and allow it to idle. Ensure engine is at normal operating temperature. Operate vehicle within conditions required for setting this DTC. Select SPECIFIC DTC function, then enter DTC P0341. If scan tool indicates TEST RAN AND PASSED, go to next step. If scan tool does not indicate TEST RAN AND PASSED, repeat step 2.
- If any other DTCs are set, diagnose DTCs as necessary. If no other DTCs are set, no problem is indicated at this time.