9B - Check RPM Signal While Cranking

9b. Check RPM Signal While Cranking





Purpose:
To determine if the CMP sensor and circuit are functioning.

Recommended Procedure:
Access RPM PID with the NGS Tester, and monitor RPM reading while cranking the engine. If RPM stays at 0, the PCM is not receiving the CMP signal; refer to Pinpoint Test DG for CMP sensor diagnosis. If the PID reads above 0 but below 100 rpm, the engine is not turning over fast enough to start the engine.

Install NGS Tester. Access RPM PID on NGS Tester and monitor rpm reading while cranking the engine. NGS Tester will read rpm if PCM is receiving a CMP signal.

Possible Causes:
- Weak battery or starter
- Faulty wire harness connection
- Poor CMP ground connection
- Incorrect CMP sensor to target wheel spacing
- Defective CMP sensor

Refer to Pinpoint Test DG for CMP sensor diagnosis. DG - Camshaft Position (CMP) Sensor

Tools Required:
New Generation Star Tester 007-00500 or equivalent