Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSPONTIAC2006WAVE BASE, 4D SEDAN, Y4M/MLMREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - 1.6L (L91) - DTC P0420 TO DTC P2076DTC P1516, P2101, OR P2119CIRCUIT/SYSTEM TESTING
2006 Pontiac Wave Base, 4D Sedan, Y4M/MLM
Circuit/System Testing
2006 Pontiac Wave Base, 4D Sedan, Y4M/MLMSECTION Circuit/System Testing
- Inspect the throttle body for the following conditions:
- A throttle blade that is not in the rest position
- A throttle valve that is binding open or closed
- A throttle valve that opens or closes without spring pressure
- If a condition is found, replace the throttle body.
- Ignition OFF, disconnect the harness connector of the throttle body.
- Ignition ON, measure for less than 0.5 volt on the motor control 1 and motor control 2 circuits.
- If voltage is greater than 0.5 volt, test the appropriate motor control circuit for a short to voltage. If the circuit tests normal, replace the ECM.
- Ignition OFF, probe motor control 1 and motor control 2 circuits with a test lamp connected to B+. Verify the test lamp does not illuminate.
- If the test lamp illuminates, test the appropriate motor control circuit for a short to ground. If the circuit tests normal, replace the ECM.
- Ignition OFF, connect the test lamp between the TAC motor control 1 and TAC motor control 2 circuits of the throttle body harness connector. Observe the test lamp while turning the ignition ON for 5 seconds and then OFF. Verify the test lamp illuminates.
- If the test lamp does not illuminate, test each motor control circuit for an open or for a short between the TAC motor control 1 and TAC motor control 2 circuits. If the circuit tests normal, replace the ECM.
- If all circuits test normal, replace the throttle body.
IMPORTANT:
Disconnecting the throttle body harness connector causes additional DTCs to set.
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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.