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Home >> Hummer >> 2008 >> H2 4D Utility Pickup >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 6.2L - DTC P0300 To DTC P1175 >> DTC P0336 >> Circuit/System Testing
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Circuit/System Testing

IMPORTANT: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
  1. Ignition OFF, disconnect the harness connector at the crankshaft position (CKP) sensor.
  2. Test for less than 1 ohm between the CKP 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 ECM.
  3. Ignition OFF, inspect the CKP sensor for correct installation.
    • If the CKP sensor is loose, inspect the sensor and the O-ring for damage, replace as necessary.
    • If any parts are worn or damaged, replace as necessary.
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