Diagnostic Procedures

1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
2. Start engine. Using scan tool, select CMP SENSOR and CAM SIGNAL PRESENT data. If scan tool indicates that RPM and CAM signal is present, go to next step. If scan tool does not indicate that RPM and CAM signal is present, go to step  4.
3. Wiggle related harnesses and connectors while monitoring scan tool display. If CAM SIGNAL PRESENT display changes to NO or if CMP sensor data RPM becomes erratic, go to step  10. If CAM SIGNAL PRESENT display does not changes to NO or if CMP sensor data RPM does not becomes erratic, fault is not present. See DIAGNOSTIC PROCEDURES .
4. Turn ignition off. Disconnect CMP sensor harness connector. Turn ignition on. Using DVOM, check voltage between ground and CMP sensor power circuit at sensor harness connector. If battery voltage is present, go to next step. If battery voltage is not present, go to step  11.
5. Check voltage between ground and power circuit at CMP sensor harness connector. If battery voltage is present, go to next step. If battery voltage is not present, go to step  12.
6. Using scan tool, monitor CAM sensor data. Using a test light connected to battery voltage, momentarily touch test light to signal circuit several times. If RPM is indicated on scan tool, go to step  16. If RPM is not indicated on scan tool, go to next step.
7. Turn ignition off. Disconnect CMP sensor harness connector. Turn ignition on. Check voltage between ground and signal circuit at CMP sensor harness connector. If voltage is present, go to step  15. If voltage is not present, go to next step.
8. Check resistance in signal circuit between CMP sensor harness connector and PCM harness connector. If resistance is 5 ohms or less, go to next step. If resistance is not 5 ohms or less, go to step  13.
9. Check continuity between ground and sensor signal circuit. If resistance is infinite, go to step  18. If resistance is not infinite, go to step  14.
10. Repair harness/connections as necessary. After repairs, go to step  20.
11. Repair open or high resistance in power circuits. After repairs, go to step  20.
12. Repair open/high resistance in ground circuit. After repairs, go to step 20.
13. Repair open/high resistance in sensor signal circuit. After repairs, go to step  20.
14. Repair sensor signal circuit shorted ground. After repairs, go to step  20.
15. Repair sensor signal circuit shorted to power. After repairs, go to step  20.
16. Check for poor connection or terminal tension at CMP sensor. Repair as necessary. After repairs, go to step  20. If connection or terminal tension is okay, go to next step.
17. Replace CMP sensor. After replacing sensor, go to step  20.
18. Check power circuit for open/high resistance between PCM and splice or check for short to ground. Repair as necessary. After repairs, go to step  20. If circuit is okay, go to next step.
19. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
20. Using scan tool, select DTC, CLEAR INFO. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter this DTC. Operate vehicle within the conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, repeat step  2.
21. Using scan tool, select CAPTURED INFO. Check if any undiagnosed DTCs are displayed. Diagnose affected DTCs. If no additional DTCs are displayed, system is okay.

For any test that requires probing PCM or component harness connectors, use Connector Test Adapter Kit (J-35616-A). This will prevent damage to harness connector terminals. Check for the following conditions:

Check for poor connections at PCM or at component. Inspect harness connectors for backed-out terminals, improper mating, broken locks, improperly formed or damaged terminals and poor terminal-to-wire connection.

Check for damaged wiring harness. If harness appears to be okay, observe scan tool while moving related connectors and wiring harnesses. A change in scan tool display may help to locate fault. If sensor signal is only affected when harness is moved at component, and there is no problem with harness or connections, component may be faulty.

Check CMP sensor for proper installation. A sensor that is loose or not fully seated, causing an excessive air gap between sensor and reluctor wheel, may cause this DTC to set.