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Home >> Cadillac >> 2007 >> CTS Base, 3.6 7, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 384 (Engine Controls And Fuel - 4.4L - DTC P0171 To DTC 00700) >> DTC P023A >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 Cadillac XLR. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the CAC coolant pump relay.
  2. Ignition ON, verify that a test lamp does not illuminate between the control circuit and ground.
    • If the test lamp illuminates, test the control circuit for a short to voltage.
  3. Verify that a test lamp illuminates between the coil voltage supply circuit and ground.
    • If the test lamp does not illuminate, test the B+ coil supply circuit for a short to ground or an open/high resistance.
  4. Verify that a test lamp illuminates between the B+ switch supply circuit and ground.
    • If the test lamp does not illuminate, test the B+ switch supply circuit for an open/high resistance. If the circuit tests normal and the B+ switch supply circuit fuse is open, test the CAC pump voltage supply circuit for a short to ground.
  5. Disconnect the harness connector at the CAC coolant pump.
  6. Test for less than 2 ohm of resistance between the CAC coolant pump ground circuit terminal 1 and ground.
    • If greater than the specified range, repair the ground circuit for an open/high resistance.
  7. Connect the harness connector at the CAC coolant pump.
  8. Connect a 10A fused jumper wire between the B+ switch circuit and the CAC coolant pump voltage supply circuit. Verify that CAC coolant pump is activated.
    • If the CAC coolant pump does not activate, test the CAC coolant voltage supply circuit for an open/high resistance. If the circuit tests normal, test the CAC coolant pump motor. Refer to Component Testing /
  9. Connect a test lamp between the B+ coil supply circuit and the CAC relay control circuit.
  10. Command the CAC coolant pump ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between commanded states.
    • If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM.
    • If the test lamp is always OFF, test the control circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  11. If all circuits test normal, test the CAC coolant pump relay. Refer to Component Testing .
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