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 MANUALSGMC1995SAFARI VAN PASSENGER, AWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - TESTS W/CODES - 4.3LTROUBLE CODE CHARTSCODE P0401, EGR FLOW TEST FAILURE - "S" & "T" SERIES 4.3L (VIN W)DIAGNOSTIC AIDS
1995 GMC Safari Van Passenger, AWD
Diagnostic Aids
1995 GMC Safari Van Passenger, AWDSECTION Diagnostic Aids
An intermittent may be caused by a broken wire inside insulation. Check for:
- Poor Connection Or Damaged Harness - Inspect control module harness connectors for backed out EGR control circuit terminal, improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wire connection, and damaged harness.
- Intermittent Test - If connections and harness are okay, monitor a DVOM connected between control module EGR control circuit terminal and ground while moving related connectors and wiring harness. If failure is induced, voltage reading will change.
NOTE:
Check exhaust system for blockage (possibly a plugged converter) if EGR valve shows signs of excessive heat. Repair cause of restricted exhaust system as necessary. Injector stuck open may be due to stuck injector pintle, grounded driver circuit or possible faulty control module. If conditions are not present, oil should be checked for possible fuel contamination.
RENDER: 1.0x
NO RELATED
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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.