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. See Special Tools . Using this kit prevents damage to the harness or component terminals.
• The ECM uses the CMP 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
• The following conditions may cause this DTC to set:
  • An intermittent condition in the 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.
  • Intermittent short to ground in the signal circuit
  • Excessive air gap between the CKP sensor and the reluctor wheel
  • CKP sensor damage or improper installation
  • Crankshaft reluctor wheel damage or improper installation
  • Foreign material passing between the CKP sensor and the reluctor wheel
• Excess crankshaft end play causes the reluctor wheel to move out of alignment with the CKP sensor. This could result in any one of the following conditions:
  • A hard start
  • A start and stall
  • Erratic performance
• For an intermittent condition, refer to Intermittent Conditions .