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Home › Hummer › 2010 › H3 Base, Automatic › Repair and Diagnosis › Engine Performance › System › Engine Controls And Fuel - 3.7L - DTC P1400 To DTC P2635 › DTC P2430-P2433 › Circuit/System Testing

Circuit/System Testing

    NOTE: The Secondary Air Pressure sensor is an integral part of the Seconday Air Check Valve.
  1. Ignition OFF for 1 minute, disconnect the harness connector at the Secondary Air Injection Pressure Sensor.
  2. Test for less than 5 Ω between the low reference circuit terminal 1 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 ECM.
  3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 3 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 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 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 ECM.
  5. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the 5 V reference circuit terminal 3. 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 ECM.
  6. If all circuits test normal, test or replace the Secondary Air Injection Pressure sensor.
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