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 MANUALSCHEVROLET2001CHEVY EXPRESS G3500, VAN PASSENGER EXTENDED, 6.5 FREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 237 (ENGINE CONTROLS - SYSTEM TESTING & ENGINE COMPONENT TESTS - 3.1L)FUEL SYSTEMSFUEL INJECTOR CIRCUIT DIAGNOSISDIAGNOSTIC PROCEDURE
2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 F
Diagnostic Procedure
2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 FSECTION Diagnostic Procedure
WARNING: This page is about a different car, the 2003 Pontiac Grand Prix, 2003 Chevrolet Malibu, and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
- Perform Diagnostic System Check - Engine Controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - 3.1L CENTURY, GRAND PRIX & MALIBU article. After performing diagnostic system check - engine controls, go to next step.
- Are any fuel injector DTCs set? If yes, go to DTC P0201-P0206: INJECTOR CONTROL CIRCUIT under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - 3.1L CENTURY, GRAND PRIX & MALIBU article. If no, go to next step.
- Check the fuel injector fuse. Is the fuel injector fuse open? If yes, go to next step. If no, go to step 6.
- Turn ignition switch to OFF position. Disconnect the fuel injector multi-way harness connector. Probe the fuel injector ignition 1 voltage circuit, fuse side, using a test light connected to battery voltage. See Figure. Does the test light illuminate? If yes, go to step 9. If no, go to next step.
- Turn ignition switch to RUN position, engine OFF. Does the test light illuminate? If yes, go to step 13. If no, go to step 8.
- Turn ignition switch to OFF position. Disconnect the fuel injector multi-way harness connector. Turn ignition switch to RUN position, engine OFF. Probe the fuel injector ignition 1 voltage circuit, fuse side, using a test light connected to a good ground. See Figure. Does the test light illuminate? If yes, go to next step. If no, go to step 10.
- Check for continuity between the ignition 1 voltage circuit terminal and a fuel injector terminal, at the multi-way harness connector, fuel injector side. Does the DVOM display a resistance above 5 ohms? If yes, go to step 11. If no, go to step 12.
- Test the fuel injector ignition 1 voltage circuit, between the multi-way harness connector and the fuel injectors for a short to ground. Did you find and correct the condition? If yes, go to step 14. If no, go to DIAGNOSTIC AIDS .
- Repair the short to ground in the fuel injector ignition 1 voltage circuit. After repair, go to step 14.
- Repair the open in the ignition 1 voltage circuit between the Underhood Bussed Electrical Center (UBEC) and the multi-way harness connector. After repair, go to step 14.
- Repair the fuel injector ignition 1 voltage circuit for an open/high resistance, between the multi-way harness connector and the splice. After repair, go to step 14.
- Repair the poor connection at the multi-way harness connector. After repair, go to step 14.
- Repair the short to a PCM ground in the fuel injector ignition 1 voltage circuit. After repair, go to next step.
- Operate the system to verify the repair. Did you correct the condition? If yes, system is okay at this time. If no, go to step 3.
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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.