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 MANUALSGMC1992JIMMY BASE, 2D UTILITY, 4.3 Z, RWD, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC TESTINGDIAGNOSTIC CIRCUIT CHECK (DIESEL)DIAGNOSTIC PROCEDUREDIAGNOSTIC PROCEDURE
1992 GMC Jimmy Base, 2D Utility, 4.3 Z, RWD, Standard
Diagnostic Procedure
1992 GMC Jimmy Base, 2D Utility, 4.3 Z, RWD, StandardSECTION Diagnostic Procedure
- Ensure all engine systems not related to Diesel Electronic Control (DEC) system are operating properly. DO NOT proceed with testing unless all problems not related to DEC system have been repaired. DEC system diagnosis should always begin with DIAGNOSTIC CIRCUIT CHECK chart in G - TESTS W/ CODES DIESEL article in this section. Performing this check determines whether DEC system and ECM are working properly.
- If trouble codes (other than Code 12) are displayed, determine whether codes are "hard" or "intermittent" trouble codes. A hard code remains until code-setting condition is repaired. Hard codes cause SERVICE ENGINE SOON light to come on.
- An intermittent code does not reset itself and is not present when vehicle is repaired. An intermittent code is often caused by loose connections. SERVICE ENGINE SOON light goes out 10 seconds after fault goes away.
NOTE:
Figures 13 & 14 are Courtesy of General Motors Corp.
RENDER: 1.0x
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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.