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.
1988 Chevrolet Spectrum ExpressFACTORY OEM SERVICE PROCEDURE
Self-Diagnostic System Check
- Locate ALDL diagnostic connector near ECM. Using a jumper wire, jump between terminals "A" and "C". See Fig 1 . Turn ignition on, but do not start engine. CHECK ENGINE light will begin to flash diagnostic code 12 indicating the system is working.
- Code 12 will flash 3 times, then any additional code will flash 3 times and continue to cycle in this sequence up to a maximum of 3 codes. A code 12 consists of one flash, a short pause and 2 flashes. See Fig 2 .
- To clear codes, remove the 10A ECM fuse in the fuse box for 10 seconds.
Factory Service Tools
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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.
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