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 VARIANT/TRIMSECTION 10 (ENGINE CONTROL SYSTEM - 3.5L - TROUBLESHOOTING & DIAGNOSIS)ENGINE CRANKS BUT DOES NOT RUNCIRCUIT/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 variant/trim than selected.
- Crank the engine for up to 30 seconds.
- Observe the Engine DTC information with a scan tool.
- If any of the following DTCs are set refer to Diagnostic Trouble Code (DTC) List - Vehicle : P0201-P0206, P0335, P0336, P0351-P0353, P0601, p0602, P0604, P0685, P1516, P2610
- Observe the engine speed parameter while cranking the engine.
- If engine RPM is not indicated, refer to Electronic Ignition (EI) System Diagnosis .
- Install a spark tester.
- Crank the engine for 15 seconds. Spark should be observed from the Spark Tester.
- If spark is not observed refer to Electronic Ignition (EI) System Diagnosis .
- With the ignition ON and the engine OFF, test the fuses that are supplied by the powertrain relay for voltage. The test lamp should illuminate at each test point for the following fuses:
- Emission Fuse
- Ignition 1 Fuse
- If the testlamp does not illuminate on at least one side of each fuse refer to DTC P0685 .
- Command the fuel pump ON and OFF. Fuel pump should energize when commanded ON and De-energize when commanded OFF
- If the fuel pump does not respond refer to Fuel Pump Electrical Circuit Diagnosis .
- Turn OFF the ignition.
- Install the J 34730-1A
J 34730-1A Fuel Pressure Gage. Turn ON the ignition and command the fuel pump ON while observing the J 34730-1A. The fuel pressure should be between 380-410 kPa (55-60 psi).
- If the fuel pressure is not within 380-410 kPa (55-60 psi) refer to Fuel System Diagnosis .
- Inspect for the following conditions:
- Compare the actual engine coolant temperature to the ECT parameter. Refer to DTC P0116, P0125, OR P0128 .
- Air filter and air intake system for restrictions and obstructions
- Test the fuel for contamination. Refer to Alcohol/Contaminants-in-Fuel Diagnosis (Without Special Tool) .
- Inspect the spark plug and spark plug wires. Refer to Spark Plug Inspection .
- Test the exhaust system for restrictions. Refer to Restricted Exhaust .
IMPORTANT:
Additional DTCs may set when using the fuel pump output control.
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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.