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Home >> Buick >> 2007 >> Allure CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 68 (Engine Control System & Fuel System - 3.6L - DTC P0335 To DTC P2097) >> DTC P0341, P0342, P0343, P0346, P0347, P0348, P0366, P0367, P0368, P0391, P0392, or P0393 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, Inspect the circuits of the appropriate camshaft position (CMP) sensor for the following conditions:
    • Routed too close to the ignition coils
    • Routed too close to after-market add-on electrical equipment
    • Routed too close to solenoids, relays, and motors
    • If a condition is found, repair as necessary.
  2. Ignition OFF, remove the fuse that supplies B+ to terminal X2-36 of the ECM.
  3. Disconnect the harness connector at the appropriate CMP sensor.
    4. IMPORTANT: The control module or the sensor may be damaged if the circuit is shorted to B+.
  4. Test for less than 5 ohms of resistance between the low reference circuit terminal 1 and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance, or for a short to voltage. If the circuit/connections test normal, replace the ECM.
  5. Install the fuse that supplies B+ to terminal X2-36 of the ECM.
  6. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 3 and ground.
    • If less than the specified range, test the 5-volt reference circuit for an open/high resistance. If the circuits/connections test normal, replace the ECM.
    • If greater than specified range, test the 5-volt reference circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.
  7. Test for 4.5-5.5 volts between the signal circuit terminal 2 and ground.
    • If less than the specified range, test the signal circuit for a short to ground or an open. If the circuit/connections test normal, replace the ECM.
    • If greater than specified range, test the signal circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.
  8. Ignition OFF, remove the appropriate CMP sensor. Inspect the CMP sensor and the camshaft actuator reluctor wheel for the following conditions:
    • Incorrect sensor installation
    • A cracked or damaged sensor
    • The sensor coming in contact with the reluctor wheel
    • Excessive air gap between the reluctor wheel and the sensor
    • Foreign material passing between the sensor and the camshaft reluctor wheel
    • Camshaft reluctor wheel damage
    • If a condition is found, repair as necessary.
  9. If all circuits/connections test normal, replace the CMP sensor.
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