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HOMESERVICE MANUALSCHEVROLET2008AVEO LT, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS AND FUEL - 1.6L - DTC P0016 TO DTC P0315DTC P0122, P0123, P0222, P0223, OR P2135 (W/TAC)CIRCUIT/SYSTEM TESTING (W/TAC)
2008 Chevrolet Aveo LT, Automatic

Circuit/System Testing (w/TAC)

2008 Chevrolet Aveo LT, AutomaticSECTION Circuit/System Testing (w/TAC)
  1. Ignition OFF, disconnect the harness connector at the throttle body assembly.
  2. Ignition OFF, test for 5 ohms or less of resistance between the low reference circuit terminal 4 and ground.
    • If greater than the specified range, test the low reference circuit for a short to voltage, or an open/high resistance. If the circuit tests normal, replace the ECM.
  3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 1 and ground.
    • If less than the specified range, test the 5-volt reference circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the ECM.
    • If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  4. Verify both scan tool TP sensor percentage parameters are between 80-88 percent.
    • TP sensor 1 signal circuit terminal 3
    • TP sensor 2 signal circuit terminal 2
  5. If less than the specified range, test the appropriate signal circuit for a short to ground. If the circuit tests normal, replace the ECM.
    • If greater than the specified range, test the appropriate signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  6. Install a 3A fused jumper wire between TP sensor 1 signal circuit terminal 3 and ground. Verify the scan tool TP sensor 1 percentage parameter is less than 2 percent.
    • If greater than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  7. Install a 3A fused jumper wire between TP sensor 2 signal circuit terminal 2 and the 5-volt reference circuit terminal 1. Verify the scan tool TP sensor 2 percentage parameter is less than 2 percent.
    • If greater than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  8. If all circuits test normal, test or replace the throttle body assembly.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.