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Circuit/System Testing

    NOTE: The Secondary Air Pressure sensor is an integral part of the Secondary Air Injection Solenoid Valve.
  1. Ignition OFF, disconnect the harness connector at the Q29 Secondary Air Injection Solenoid Valve.
  2. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 Ω between the low reference circuit terminal 3 and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.
  3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 1 and ground.
    • If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
    • If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  4. Verify the scan tool Secondary Air Injection Pressure Sensor voltage parameter is less than 0.5 V.
    • If greater than the specified range, test the signal circuit terminal 2 for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  5. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the 5 V reference circuit terminal 1. Verify the scan tool Secondary Air Injection Pressure Sensor voltage parameter is greater than 4.8 V.
    • If less than the specified range, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
  6. If all circuits test normal, test or replace the Q29 Secondary Air Injection Solenoid Valve.
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