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 P1391, P1392, OR P1393CIRCUIT/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 rough road sensor.
- Ignition ON, verify that the rough road sensor parameter is less than 0.1 volt.
- If greater than 0.1 volt, test the signal circuit of the rough road sensor for a short to voltage. If the circuit/connections test normal, replace the ECM.
- Ignition ON, test for less than 0.2 volt between the low reference circuit and ground.
- If greater than 0.2 volt, test the low reference circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.
- Ignition OFF, test for less than 5 ohms of resistance between the low reference circuit and ground.
- If greater than 5 ohms, test the low reference circuit for an open/high resistance. If the circuit/connections test normal, replace the ECM.
- Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit and ground.
- If less than 4.8 volts, test the 5-volt reference circuit for a short to ground or open/high resistance. If the circuit/connections test normal, replace the ECM.
- If greater than 5.2 volts, test the 5-volt reference circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.
- Ignition ON, install a 3A fused jumper wire between the signal circuit and the 5-volt reference circuit. Verify that the rough road sensor parameter is greater than 4.8 volts.
- If less than 4.8 volts, test the signal circuit of the rough road sensor for a short to ground or an open/high resistance. If the circuit/connections test normal, replace the ECM.
- If all circuits/connections test normal, replace the rough road sensor.
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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.