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HOMESERVICE MANUALSCHEVROLET2006COBALT SS, 4D SEDAN, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 705 (ENGINE CONTROL SYSTEM & FUEL SYSTEM - 2.2L (L61) - DTC P0016 TO DTC P0411)DTC P0340CIRCUIT/SYSTEM TESTING
2006 Chevrolet Cobalt SS, 4D Sedan, Standard

Circuit/System Testing

2006 Chevrolet Cobalt SS, 4D Sedan, StandardSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2008 Pontiac G5 and 2008 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.

P0340

  1. Ignition OFF, disconnect the appropriate CMP sensor wire harness connector.
  2. Test for less than 1 ohm between the 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 5-volt reference circuit terminal A 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 signal circuit terminal C 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 CMP signal circuit terminal C.
  6. Ignition ON, momentarily touch the other end of the fused jumper wire to the battery negative post. The CMP active counter parameter on the scan tool should increment.
    • If the CMP active counter increments, replace the CMP sensor.
    • If the CMP active counter does not increment, replace the ECM.
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