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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 252 (Engine Control System & Fuel - 4.8L, 5.3L, 6.0L, Or 6.2L - DTC P0230 To DTC P0690) >> DTC P0336 >> Circuit/System Testing

Circuit/System Testing

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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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