Diagnostic Aids

The following table illustrates the ECM connector locations:

• Use the J 35616  Connector Test Adapter Kit for any test that requires probing the ECM harness connector or a component harness connector. Using this kit prevents damage to the harness or component terminals.
• The ECM uses the camshaft position sensors to determine engine speed and position when there is a CKP sensor condition.
• The engine will operate with a CKP sensor condition only if the ECM has stored the learned reference position of the camshafts in memory. With a crankshaft position sensor condition other than a short to voltage in the signal circuit, the engine will go into a limp home mode after a hard restart. The ECM then calculates engine speed from one of the camshaft position sensors. During a limp home mode the following additional DTCs may set and should be ignored:
  • DTC P0324 Knock Sensor (KS) Module Performance
  • DTC P1011 Intake Camshaft Position Actuator Park Position Bank 1
• A short to voltage in the signal circuit of the CKP sensor will cause the engine to stall or not start and a DTC will not set.
• An intermittent condition in the camshaft position (CMP) actuator solenoid circuits can cause a CKP DTC to set. Inspect the CMP actuator solenoid harness connections and related wiring, if you suspect this condition.
• The ECM uses a pull-up voltage of 2.5 volts on each CKP sensor circuit to reduce noise interference from EMI. If the voltage is not present, replace the ECM.
• For an intermittent condition, refer to Intermittent Conditions .