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Home >> Chevrolet >> 2012 >> Cruze Eco, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 5 (Engine Controls/Fuel - 1.8L - DTC Diagnostics, Troubleshooting & Diagnosis) >> Diagnostic Information and Procedures >> DTC P0121-P0123, P0222, P0223, or P2135 (LUW) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
NOTE:

You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

  1. Ignition OFF, all vehicles systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Disconnect the harness connector at the Q38 Throttle Body.
  2. Ignition OFF, test for less than 5 Ω between the low reference circuit terminal C and ground.
    • If greater than 5 Ω, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
  3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal E 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. Test for less than 1 V between the Throttle Position Sensor 1 signal circuit terminal D and ground.
    • If greater than specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.
  5. Test for 4.8-5.2 V between the Throttle Position Sensor 2 signal circuit terminal F and ground.
    • If less than 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.
    • If greater than specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.
  6. Install a 3 A fused jumper wire between Throttle Position Sensor 1 signal circuit terminal D and the 5 V reference circuit terminal E. Verify the scan tool Throttle Position Sensor 1 voltage parameter is greater than 4.8 V.
    • 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.
  7. If all circuits test normal, replace the Q38 Throttle Body.
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