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Home >> Pontiac >> 2008 >> Torrent GXP, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 147 (Engine Controls And Fuel - 3.4L - DTC P0016 To P2135) >> DTC P0340 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 Pontiac Torrent and 2009 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the multi-way engine harness to fuel injector harness connector X105.
  2. Test for less than 1 ohm between ECM side of the low reference circuit terminal N 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 ECM side of the 5-volt reference circuit terminal P 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 ECM side of the signal circuit terminal R 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 ON, using a jumper wire connected to ground, momentarily touch the CMP sensor signal circuit terminal R repeatedly. The CMP active counter parameter should increment.
    • If the CMP active counter does not increment, replace the ECM.
  6. Ignition OFF, inspect the wiring harness, from the multi-way connector X105 to the CMP sensor, for any damage, opens, or shorts.
    • If the circuits test normal, replace the CMP sensor.
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