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 MANUALSPONTIAC2006G6 GTP, 2D COUPE, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1181 (HYBRID ENGINE CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC P0A4BCIRCUIT/SYSTEM TESTING
2006 Pontiac G6 GTP, 2D Coupe, Standard
Circuit/System Testing
2006 Pontiac G6 GTP, 2D Coupe, StandardSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2008 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
- Disconnect the MGU X2 and the SGCM X2 connectors. Refer to Generator with Starter Replacement and Generator Control Module Replacement .
- Test the circuits in the SGCM to MGU Terminal Reference Table as indicated below. Also test these circuits for short to ground.
- If any of the circuits are not within specification, check for an open/high resistance or short to ground.
- Reconnect SGCM connector X2.
- Test the circuits in the MGU to SGCM Specification Table to ground as indicated below.
- If any of the circuits are not within the specified range, replace the SGCM.
- Reconnect the MGU X2 connector and disconnect the SGCM X2 connector. Refer to Generator with Starter Replacement and Generator Control Module Replacement .
- Test the circuits in the SGCM to MGU Specification Table as indicated below.
- If all circuits test normal, replace the MGU.
SGCM to MGU Terminal Reference Table
| MGU Connector/Terminal | SCGM Connector/Terminal | Minimum Resistance | Maximum Resistance |
|---|---|---|---|
| Harness Continuity Test | |||
| B | X2/7 | - | less than 1 ohm |
| C | X2/6 | - | less than 1 ohm |
| D | X2/4 | - | less than 1 ohm |
| E | X2/17 | - | less than 1 ohm |
| F | X2/20 | - | less than 1 ohm |
| G | X2/19 | - | less than 1 ohm |
| H | X2/5 | - | less than 1 ohm |
MGU to SGCM Specification Table
| MGU Connector/Terminal | Signal Name | Minimum Resistance | Maximum Resistance |
|---|---|---|---|
| Measurements made to ground. SGCM connected and MGU disconnected. | |||
| D | REZ- | 1.6k ohms | 2k ohms |
| H | REZ+ | 1.6k ohms | 2k ohms |
| C | REZ3 | Over 1 M ohm | - |
| B | REZ4 | Over 1 M ohm | - |
| E | REZGS (GND) | - | less than 5 ohm |
| G | REZ1 | Over 1 M ohm | - |
| F | X2/5 | Over 1 M ohm | - |
SGCM to MGU Specification Table
| SGCM Connector/Terminal | SGCM Connector/Terminal | Minimum Resistance | Maximum Resistance |
|---|---|---|---|
| MGU connected and SGCM disconnected. | |||
| X2/4 | X2/5 | 20.1 ohms | 26.7 ohms |
| X2/6 | X2/19 | 32.4 ohms | 43.0 ohms |
| X2/7 | X2/20 | 32.9 ohms | 43.5 ohms |
| X2/4 | X2/6 | Over 1 meg ohm | - |
| X2/4 | X2/7 | Over 1 meg ohm | - |
| X2/6 | X2/7 | Over 1 meg ohm | - |
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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.