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Circuit/System Testing

  1. Ignition OFF, disconnect the B26 crankshaft position sensor connector.
  2. Ignition OFF, vehicle systems OFF, this may take up to 2 minutes, test for less than 3 Ω between low reference circuit terminal B and ground.
    • If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.
  3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal A and ground.
    • If less than the specified range, test the 5 V reference circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the K20 ECM.
    • If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  4. Test for 4.8-5.2 V between the signal circuit terminal C and ground.
    • If less than the specified range, test the signal circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the K20 ECM.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  5. Ignition ON, engine OFF, using a 3 A jumper wire connected to ground, momentarily touch the crankshaft position sensor signal circuit terminal C repeatedly. The crankshaft position active counter parameter should increment.
    • If the crankshaft position active counter parameter does not increment, replace the K20 ECM.
    • If the crankshaft position active counter increments, test or replace the B26 crankshaft position sensor.
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