LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Buick >> 2009 >> Allure CXL >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 3.8L - DTC P0016 To DTC P0350 >> DTC P0335 >> Circuit/System Testing
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Circuit/System Testing

  1. Ignition OFF, Disconnect the IC module connector. Test for less than 3 ohms between the IC module ground circuit terminal K and battery ground
    • If greater than the specified value, test the ground circuit for an open/high resistance.
  2. Ignition ON, test for B+ between the IC module ignition voltage circuit terminal P and ground.
    • If less than the specified range, test the IC module ignition voltage circuit for an open/high resistance or short to ground.
  3. Disconnect the CKP sensor connector.
  4. Ignition OFF, test for less than 1 ohm on the low reference circuit between the CKP sensor 1 terminal C and the IC module terminal M.
    • If greater than the specified value, test the low reference circuit for an open/high resistance.
  5. Connect the IC module.
  6. Ignition ON, test for more than 10 volts between the 12-volt reference circuit CKP sensor terminal D and ground.
    • If less than the specified range, test the 12-volt reference circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the IC module.
  7. Ignition ON, test for 4-8 volts between the signal circuit CKP sensor 1 terminal B 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 IC module.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the IC module.
  8. Ignition ON, using a jumper wire connected to ground, momentarily touch the CKP sensor signal circuit CKP sensor 1 terminal B repeatedly. The CKP Sensor parameter should increment.
    • If the CKP Sensor parameter increments, replace the CKP sensor.
  9. Ignition OFF, disconnect the IC module connector. Ignition ON, using a jumper wire connected to B+, momentarily touch the medium resolution engine speed signal circuit IC Module terminal C repeatedly. The CKP Sensor B parameter should increment.
    • If the CKP Sensor B parameter does not increment, test the medium resolution engine speed signal for an open/high resistance, short to ground, or a short to voltage.
    • If all circuits test OK, replace the PCM.
    • If the CKP Sensor B parameter increments, replace the IC module.
scientia non olet · About LEMON Manuals