16. Check The CKP And CMP Signal While Cranking Test
16. CHECK THE CKP AND CMP SIGNAL WHILE CRANKING TESTPurpose:
The purpose of this test is to verify the CMP and CKP sensors and circuits are functioning.
Scan Tool - Data List Monitoring
- The scan tool may reset below 9.5 volts.
- Select the parameters indicated from the scan tool parameter list and monitor while cranking the engine.
NOTE: An outside power source may be needed for the scan tool.
Low RPM may be caused by starting or charging system concerns. No RPM indicated while cranking may indicate a CKP concern.
Recommended Procedure:
- Connect the scan tool.
- Ignition ON, engine OFF.
- Access and monitor the RPM PID while cranking the engine.
If RPM is above 150 RPM, GO to Pinpoint Test V and diagnose the CMP sensor. Test V: Camshaft Position (CMP) Sensor
If RPM is 0 RPM, GO to Pinpoint Test D and diagnose the CKP sensor. Test D: Crankshaft Position (CKP) Sensor
Refer to Reference Values, Typical Diagnostic Reference Values for normal operating values. Pinout Values and Diagnostic Parameters
Possible Causes:
- Weak battery or starter
- Circuitry
- CKP sensor
- CMP sensor
Tools Required:
Scan tool