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 Sprint TurboFACTORY OEM SERVICE PROCEDURE
ECM Power Circuits Check
- Disconnect ECM coupler. Turn ignition on, but do not start engine. Connect voltmeter between terminal No. 19 of disconnected coupler (on wiring harness side) and body ground. See Fig 1 . Check voltage.
- Repeat voltage check for terminal Nos. 20, 23, 24, 26, 1 and 10. If measured voltage between each terminal and body is about 12 volts, each circuit is in good condition.
- Check clutch switch operation as follows: Connect voltmeter between terminal No. 26 and ground. Depress clutch pedal fully. Voltage should drop to zero, indicating clutch switch is on and terminal is grounded. Reconnect coupler to ECM.
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.