[amidgeha]

Engine Speed Input Circuit

The Engine Control Module (ECM) monitors the engine speed through the Crankshaft Position (CKP) sensor with the engine running, and send signal to the Transmission Control Module (TCM).

Cause:
Faulty Crankshaft Position (CKP) Sensor
Crankshaft Position (CKP) Sensor harness is open or shorted
Crankshaft Position (CKP) Sensor circuit poor electrical connection
Communication error between the Engine Control Module (ECM) and Transmission Control Module (TCM)

Symptoms:
Check engine light