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Home >> Chevrolet >> 2011 >> Volt >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 1.4L (LUU) - DTC P1400 Through DTC P2635 >> DTC P1458-P145A >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the Q63 EVAP system leak detection pump assembly.
  2. Test for less than 5 Ω between the Q63 EVAP system leak detection pump assembly low reference circuit terminal 8 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 engine control module.
  3. Service Mode active, test for 4.8-5.2 V between the 5 V reference circuit terminal 6 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 engine control module.
    • 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 engine control module.
  4. Verify the scan tool EVAP leak detection pump pressure sensor parameter is less than 1 kPa (0.15 PSI).
    • If greater than the specified range, test the signal circuit terminal 7 for a short to voltage. If the circuit tests normal, replace the K20 engine control module.
  5. Install a 3 A fused jumper wire between the signal circuit terminal 7 and the 5 V reference circuit terminal 6. Verify the scan tool EVAP leak detection pump pressure sensor parameter is greater than 127 kPa (18.42 PSI).
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 engine control module.
  6. If the circuits test normal, replace the Q63 EVAP system leak detection pump assembly.
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