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 MANUALSCHEVROLET1988CHEVY VAN G30, 6.2 J, 400/M40REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISCCC TBI TESTS W/CODESDIAGNOSTIC CHARTSPOWER STEERING PRESSURE SWITCH (2.5L)TEST DESCRIPTION
1988 Chevrolet Chevy Van G30, 6.2 J, 400/M40
Test Description
1988 Chevrolet Chevy Van G30, 6.2 J, 400/M40SECTION Test Description
NOTE:
Test numbers refer to test numbers on diagnostic chart.
- Checks for ECM signal voltage on circuit No. 495, and confirms ground circuit No. 450 is okay.
- Maximum resistance, or infinity, indicates an open switch.
- Less than one ohm indicates that switch is closed when power steering pressure is high. Switch is okay.
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.