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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 89 (Engine Control System & Fuel System - 3.7L - DTC P0365 To DTC P1107) >> DTC P0411 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 Isuzu i-370, 2007 GMC Canyon, and 2007 Chevrolet Colorado. 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 terminal 87 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 terminal 86 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 terminal 30 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 ohms 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  with a 50A fuse between the AIR pump relay switch B+ circuit terminal 30 and the controlled output circuit terminal 87. 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  .
  10. Connect a test lamp between the AIR pump relay coil ignition circuit terminal 86 and the AIR pump relay control circuit terminal 85.
  11. Ignition ON, command the AIR pump relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the AIR pump relay control circuit for a short to ground. If the circuit tests normal, replace the ECM
    • If the test lamp is always OFF, test the AIR pump relay control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
  12. 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 terminal 87 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 terminal 86 and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
  4. Verify that a test lamp illuminates between the AIR pump relay switch B+ circuit terminal 30 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 ohms between the AIR solenoid 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 10A fused jumper wire between the AIR solenoid relay switch B+ circuit terminal 30 and the controlled output circuit terminal 87. Verify the AIR solenoid valve activates.
    • 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 10A fused jumper wire.
  10. Connect a test lamp between the AIR solenoid relay coil ignition circuit terminal 86 and the relay coil control circuit terminal 85.
  11. Ignition ON, command the AIR solenoidrelay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the 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 a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
  12. If all circuits test normal, replace the air pump 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. If an exhaust leak is detected, repair as necessary.
  3. Engine running, connect the J 36169-HD  with a 50A fuse between the AIR pump relay switch B+ circuit terminal 30 and the controlled output circuit terminal 87. Verify the AIR Pressure Sensor parameter is not 20-25 kPa above BARO.
    • If 20-25 kPa 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 at the AIR pump.
  6. Engine running, command the AIR solenoid relay ON while observing the AIR Pressure Sensor parameter. Verify the reading is not 8-10 kPa above BARO.
    • If 8-10 kPa above BARO, the AIR pump inlet hoses/pipes are restricted. Remove the restriction or replace the inlet 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 solenoid ON while observing the AIR Pressure Sensor parameter. Verify the reading is not 8-10 kPa above BARO.
  11. If 8-10 kPa above BARO, test/inspect the AIR pump outlet hoses/pipes for leaks or restrictions.
  12. Test all AIR pump wiring and connections for less than 2 ohms. If the wiring and connections test normal, 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 to the AIR solenoid valve.
  3. Connect the AIR pump outlet pipe/hose to the AIR solenoid valve.
  4. Engine running, command the AIR solenoid relay 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 gaskets for proper alignment. If normal, test/inspect the cylinder head or exhaust manifold for a restriction.
  6. Test all AIR pump wiring and connections for less than 2 ohms. If the wiring and connections test normal, replace the AIR pump.
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