LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Buick >> 2008 >> Allure Super >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 5.3L - DTC P0016 To DTC P0358 >> DTC P0335 >> Circuit/System Testing
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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 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.
  4. 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.
  5. Ignition OFF, connect a fused jumper wire to the CKP signal circuit terminal A.
  6. 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