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Home >> Buick >> 2009 >> Allure CXL >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 3.8L - DTC P0016 To DTC P0350 >> DTC P0340 >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the IC module connector. Test for less than 3 ohms between the IC module ground circuit IC module 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 IC module 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 CMP sensor connector.
  4. Test for less than 1 ohm on the low reference circuit between the CMP sensor terminal B and the IC module terminal M.
    • If greater than the specified value, test the low reference circuit for an open/high resistance.
  5. Ignition OFF, connect the IC module.
  6. Ignition ON, test for more than 10 volts between the 12-volt reference circuit CMP sensor terminal C 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 CMP sensor 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 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 CMP sensor signal circuit CMP sensor terminal A repeatedly. The CMP Sensor RPM parameter should increment.
    • If the CMP Sensor RPM parameter increments, replace the CMP sensor.
  9. Ignition OFF, disconnect the IC module connector. Ignition ON, using a jumper wire connected to B+, momentarily touch the camshaft position signal circuit IC module terminal F repeatedly. The CMP Sensor RPM parameter should increment.
    • If the CMP Sensor RPM parameter increments, replace the IC module.
    • If the CMP Sensor RPM parameter does not increment, test the camshaft position signal circuit for an open/high resistance, short to ground, or a short to voltage. If all circuits test OK, replace the PCM.
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