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Circuit/System Testing

    IMPORTANT: If the CKP sensor lead is damaged in any way, replace the CKP sensor.
  1. Ignition OFF, disconnect the harness connector at the crankshaft position (CKP) sensor.
  2. Ignition ON, test for 1.5-2.0 volts between the signal circuit terminal 2 and the low reference circuit terminal 1.
    • If less than the specified range, test the applicable circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
    • If greater than the specified range, test the applicable circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  3. If all circuits test normal, test or replace the CKP sensor.
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