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 P0016 TO DTC P0404DTC P0201, P0202, P0203, OR P0204CIRCUIT/SYSTEM TESTING
2006 Pontiac Wave Base, 4D Sedan, Y4M/MLM
Circuit/System Testing
2006 Pontiac Wave Base, 4D Sedan, Y4M/MLMSECTION Circuit/System Testing
- Ignition OFF, disconnect the harness connector of the appropriate fuel injector.
- Ignition ON, verify that a test lamp illuminates between the ignition 1 voltage circuit and ground.
- If the test lamp does not illuminate, repair the ignition 1 voltage circuit for a short to ground or an open/high resistance. Replace the fuse if necessary.
- With the ignition OFF, connect a J 34730-405 between the control circuit and the ignition 1 voltage circuit.
- Engine idling, the test lamp should flash.
- If the test lamp remains ON all the time, test for a short to ground on the control circuit. If circuit/connections test normal, replace the ECM.
- If the test lamp remains OFF all the time, test for a short to voltage or an open/high resistance on the control circuit. If circuit/connections test normal, replace the ECM.
- If all circuits/connections test normal, test or replace the fuel injector.
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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.