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 MANUALSCHEVROLET2000CHEVY EXPRESS G3500, VAN CARGO EXTENDED, 6.5 FREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM SELF-DIAGNOSTICS - GASOLINE - 4.3L, 5.0L, 5.7L & 7.4LDIAGNOSTIC TESTSDTC P1404: EGR VALVE CLOSED PINTLE POSITIONDIAGNOSTIC PROCEDURES
2000 Chevrolet Chevy Express G3500, Van Cargo Extended, 6.5 F
Diagnostic Procedures
2000 Chevrolet Chevy Express G3500, Van Cargo Extended, 6.5 FSECTION Diagnostic Procedures
- Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK . After performing OBD system check, go to next step.
- Turn ignition on, engine off. Using scan tool, command EGR valve to 20, 50, 70 and 100 percent. If actual EGR position follows commanded EGR position, go to next step. If actual EGR position does not follow commanded EGR position, go to step 4.
- DTC is intermittent. Check if additional DTCs are set. If additional DTCs are set, diagnose affected DTCs. If no additional DTCs are set, see DIAGNOSTIC AIDS .
- Disconnect EGR harness connector. If actual EGR position is about zero percent, go to step 6. If actual EGR position is not about zero percent, go to next step.
- Check EGR valve signal circuit for short to voltage. Repair as necessary. After repairs, go to step 12. If circuit is okay, go to step 11.
- Using DVOM, check voltage between ground and EGR 5-volt reference circuit terminal at harness connector. If voltage reading is about 5.2 volts, go to next step. If voltage reading is not about 5.2 volts, go to step 8.
- Using test light connected to ground, probe test light to EGR valve feed control circuit terminal at harness connector. If test light illuminates, go to step 9. If test light does not illuminate, go to step 10.
- Check EGR 5-volt reference circuit for short to voltage. Repair as necessary. After repairs, go to step 12. If circuit is okay, go to step 11.
- Check EGR control circuit for short to voltage. Repair as necessary. After repairs, go to step 12. If circuit is okay, go to step 11.
- Replace EGR valve. After replacing EGR valve, go to step 12.
- Replace VCM. Program replacement VCM using required equipment. After replacing VCM, go to next step.
- Using scan tool, select CLEAR INFO or CLEAR DTCs function to clear DTCs. Start engine and allow it to idle. Ensure engine is at normal operating temperature. Operate vehicle within conditions required for setting this DTC. Select SPECIFIC DTC function then enter this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, repeat step 2.
- If any other DTCs are set, diagnose DTCs as necessary. If no other DTCs are set, no problem is indicated at this time. See DIAGNOSTIC AIDS .
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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.