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 MANUALSCHEVROLET1996CHEVY EXPRESS G3500, VAN PASSENGER EXTENDED, 4.3 WREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - TESTS W/CODES - G SERIES (GASOLINE)DIAGNOSTIC TROUBLE CODESDTC P1508 - IDLE AIR CONTROL SYSTEM LOW RPMPASSIVE TEST
1996 Chevrolet Chevy Express G3500, Van Passenger Extended, 4.3 W
Passive test
1996 Chevrolet Chevy Express G3500, Van Passenger Extended, 4.3 WSECTION Passive test
- No TP sensor DTCs are set.
- No ECT sensor DTCs are set.
- No VSS DTCs are set.
- No MAP sensor DTCs are set.
- Engine coolant temperature is greater than 162°F (72°C).
- Intake air temperature is greater than -13°F (-25°C).
- BARO is greater than 70 kPa (less than 10,300 ft.).
- Vehicle speed is less than 2 MPH.
- System voltage is greater than 10 volts but less than 18 volts.
- Engine run time is greater than 30 seconds.
- Throttle position is less than 1 percent.
- All conditions are met for greater than 3 seconds.
- Change in calculated airflow is greater than 2 counts.
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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.