LEMON Manuals: Even more car manuals for everyone
Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 253 (Engine Control System & Fuel - Hybrid (Hp2) 6.0L (LFA) - DTC P0231 To DTC P0690) >> DTC P0335 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
  1. Ignition OFF, open the hood to disable the Auto-Stop function. Refer to Hybrid Modes of Operation Description .
  2. Ignition ON, verify the scan tool hood position parameter displays Open.
  3. Ignition OFF, disconnect the harness connector at the CKP sensor.
  4. Test for less than 3 ohms 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.
  5. Ignition ON, test for 4.8-5.2 volts between the CKP 5-volt reference circuit, terminal C and ground.
    • If less than the specified range, test the 5-volt reference circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the ECM.
    • If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  6. Ignition ON, test for 4.8-5.2 volts between the CKP signal circuit terminal A 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 ECM.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  7. Ignition OFF, connect a fused jumper wire to the CKP signal circuit terminal A.
  8. Ignition ON, momentarily touch the other end of the fused jumper wire to the battery negative post. The CKP active counter should increment.
    • If the CKP active counter increments, test or replace the CKP sensor.
    • If the CKP active counter does not increment, replace the ECM.
scientia non olet · About LEMON Manuals