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Home >> Pontiac >> 2009 >> Vibe Base, 2.4 0, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 71 (Engine Control System & Fuel System - 4.6L - DTC P0340 To DTC P2433) >> DTC P0411, P0412, P0418, P2440, or P2444 >> Circuit/System Testing >> Notes

Circuit/System Testing: Notes

WARNING: This page is about a different car, the 2009 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.

Secondary Air Injection Pump Malfunction

  1. Ignition OFF, disconnect the AIR pump relay.
  2. Ignition ON, verify that a test lamp does not illuminate between the controlled output circuit and ground.
    • If the test lamp illuminates, test the controlled output circuit for a short to voltage.
  3. Verify that a test lamp illuminates between the AIR pump relay coil ignition circuit and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, replace the AIR pump relay.
  4. Verify that a test lamp illuminates between the AIR pump relay switch B+ circuit and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the controlled output circuit for a short to ground.
  5. Ignition OFF, disconnect the harness connector at the AIR pump.
  6. Test for less than 2 Ω between the AIR pump ground circuit terminal B and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  7. Connect the harness connector at the AIR pump.
  8. Connect the J 36169-HD:  Fused Jumper 50A fused jumper wire between the AIR pump relay switch B+ circuit and the controlled output circuit. Verify the AIR pump is activated.
    • If the AIR pump does not activate, test the controlled output circuit for an open/high resistance. If the circuit tests normal, test or replace the AIR pump.
  9. Remove the J 36169-HD:  Fused Jumper.
  10. Verify that a test lamp does not illuminate between the AIR pump relay coil ignition circuit and the AIR pump relay control circuit.
    • If the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM.
  11. Remove the test lamp.
  12. Ignition ON, command the AIR pump relay ON and OFF with a scan tool. Verify the scan tool AIR Pump Relay Ckt. Short Volts Test Status parameter is OK.
    • If not the specified value, test the control circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  13. Install a 3A fused jumper wire between the control circuit terminal and the ignition circuit terminal. Command the AIR pump relay ON with a scan tool. Verify the scan tool AIR Pump Relay Ckt. Short Volts Test Status Parameter is Fault.
    • If not the specified value, test the control circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  14. If all circuits test normal, replace the AIR pump relay.

Secondary Air Injection Solenoid Malfunction

  1. Ignition OFF, disconnect the AIR solenoid relay.
  2. Ignition ON, verify that a test lamp does not illuminate between the controlled output circuit and ground.
    • If the test lamp illuminates, test the controlled output circuit for a short to voltage.
  3. Verify that a test lamp illuminates between the AIR solenoid relay coil ignition circuit and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, replace the AIR solenoid relay.
  4. Verify that a test lamp illuminates between the AIR solenoid relay switch B+ circuit and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the controlled output circuit for a short to ground.
  5. Ignition OFF, disconnect the harness connector at the AIR solenoid valve.
  6. Test for less than 2 Ω between the AIR solenoid valve ground circuit terminal 4 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  7. Connect the harness connector at the AIR solenoid valve.
  8. Connect a 15A fused jumper wire between the AIR solenoid relay switch B+ circuit and the controlled output circuit. Verify the AIR solenoid valve is activated.
    • If the AIR solenoid valve does not activate, test the controlled output circuit for an open/high resistance. If the circuit tests normal, test or replace the AIR solenoid valve.
  9. Remove the 15A fused jumper wire.
  10. Verify that a test lamp does not illuminate between the AIR solenoid relay coil ignition circuit and the relay coil control circuit.
    • If the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM.
  11. Remove the test lamp.
  12. Command the AIR solenoid ON and OFF with a scan tool. Verify the scan tool AIR Sol parameter Ckt. Short Volts Test Status Parameter is OK.
    • If not the specified value, test the control circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  13. Install a 3A fused jumper wire between the control circuit terminal and the ignition circuit terminal. Command the AIR solenoid ON with a scan tool. Verify the scan tool AIR Sol Ckt. Short Volts Test Status Parameter is Fault.
    • If not the specified value, test the control circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  14. If all circuits test normal, replace the AIR solenoid relay.

Secondary Air Injection System Pressure Low

  1. Engine running, inspect for exhaust leaks between the AIR solenoid valve and the catalytic converter.
    • If an exhaust leak is detected, repair as necessary.
  2. Ignition OFF, disconnect the AIR Pump relay.
  3. Engine running, connect the J 36169-HD:  Fused Jumper 50A fused jumper wire between the AIR pump relay switch B+ circuit and the controlled output circuit. Verify the scan tool AIR Pressure Sensor parameter is less than 15 kPa above BARO.
    • If more than the specified range above BARO, replace the AIR pump relay.
  4. Ignition OFF, remove the fused jumper wire and connect the AIR pump relay.
  5. Remove the air inlet hose from at AIR pump.
  6. Engine running, command the AIR System ON while observing the AIR Pressure Sensor parameter. Verify the reading is less than 8 kPa above BARO.
    • If more than the specified range above BARO, the AIR pump inlet hoses/pipes are restricted. Remove the restriction or replace the hose/pipe.
  7. Ignition OFF, disconnect the hose at the AIR pump outlet.
  8. Disconnect the hose at the AIR solenoid valve inlet.
  9. Install a length of standard 1 inch I.D. (25.4 mm) hose from the AIR pump outlet to the AIR solenoid valve inlet.
  10. Engine running, command the AIR System ON with a scan tool while observing the AIR Pressure Sensor parameter. Verify the reading is less than 8 kPa above BARO.
    • If more than the specified range above BARO , test or inspect the AIR pump outlet hoses/pipes for leaks or restrictions.
  11. Test all AIR pump wiring and connections for less than 2 Ω. If the wiring and connections test normal, and the hoses/pipes are OK, replace the AIR pump.

Secondary Air Injection System Pressure High

  1. Ignition OFF, remove the AIR solenoid valve.
  2. Connect the AIR pump outlet pipe/hose at the AIR solenoid valve.
  3. Connect the AIR solenoid valve wiring harness to the AIR solenoid valve.
  4. Engine running, command the AIR System ON while observing the AIR Pressure Sensor parameter. The reading should be less than 11 kPa above BARO.
    • If greater than the specified value, replace the AIR solenoid valve.
  5. Inspect the AIR solenoid valve gasket for proper alignment. If normal, test or inspect the AIR solenoid valve outlet pipe and exhaust manifold for a restriction.
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