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 MANUALSCHEVROLET1993SPORTVAN G30, VAN PASSENGER, 7.4 NREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 23 (ENGINE CONTROLS - TESTS W/CODES - 6.5L DIESEL)DTC 57 - PCM 5-VOLT SHORTEDNOTES
1993 Chevrolet Sportvan G30, Van Passenger, 7.4 N
DTC 57 - Pcm 5-Volt Shorted: Notes
1993 Chevrolet Sportvan G30, Van Passenger, 7.4 NSECTION Notes
WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 1994 GMC Yukon, 1994 GMC Suburban, 1994 GMC Pickup, 1994 GMC Cab & Chassis, and 1994 GMC C3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
The 5-volt reference is a non-varying calculated voltage. DTC 57 will set when 5-volt reference is less than one volt. PCM will default to backup fuel, no EGR and no turbo boost.
NOTE:
Test numbers refer to numbers on diagnostic chart.
- This step confirms that a DTC is still present.
- This step checks that a 5-volt reference is present from the PCM.
- This step determines if a short to ground is present in the 5-volt reference circuits or in the PCM.
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.