Crankshaft Position Sensor System Diagnosis

Crankshaft Position Sensor System Diagnosis

Circuit Description

The crankshaft position (CKP) sensor is a 24X sensor. It provides 24 digital ON/OFF signals to the powertrain control module (PCM) per revolution of the crankshaft. This information is used by the PCM for ignition timing, fuel injector timing, misfire diagnostics, and tachometer display. The PCM supplies 12 volts to the sensor on the 12-volt reference circuit, and provides a ground on the low reference circuit. The CKP sensor provides signals to the PCM on the medium resolution engine speed signal circuit.

Diagnostic Aids

A faulty CKP sensor, CMP sensor, or a short to ground on either 12-volt reference circuit may cause the CKP signal to be lost, preventing the engine from running.

Test Description

Step 1 - Step 10:

Step 11 - Step 21:

Step 22 - Step 23:

The number below refers to the step number on the diagnostic table.
9. Any change in RPM verifies that the controller is able to receive a signal.