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 MANUALSBUICK1989SKYHAWK BASE, 2D COUPE, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)TRANSMISSIONAUTOMATIC TRANSDIAGNOSIS - TORQUE CONVERTER CLUTCHDIAGNOSTIC CHARTSPFI CHART C-1 - ECM CHECKNOTES ON FAULT TREE
1989 Buick Skyhawk Base, 2D Coupe, Automatic
Notes On Fault Tree
1989 Buick Skyhawk Base, 2D Coupe, AutomaticSECTION Notes On Fault Tree
- The ECM supplies power through a high side driver to Cruise Control Vent and Vacuum Solenoids. An internal short in servo causing a low resistance or short to ground in wiring harness may damage ECM or cause servo-to-solenoids to fail.
- The ECM supplies power to fuel pump relay through a high side driver. An internal short in relay winding causing a low resistance or short to ground in wiring harness may cause damage to ECM or relay to fail.
- The ECM supplies power to ISC through an internal switching IC that will change polarity of circuit. An internal short in ISC motor armature windings or short to ground in wiring harness may cause damage to ECM or ISC motor to fail.
- The ECM provides ground for EGR solenoid, Electric Switching Valve (ESV). Canister Purge solenoid, and Electric Divert Valve (EDV) through a quad driver IC. An internal short in windings or resistor of devices or a short to ground in wiring harness may cause damage to ECM or Emission Control System (ECS) device.
- The ECM provides ground for the VCC solenoid in transmission through a quad driver IC. An internal short in winding or diode of solenoid or a short to ground in wiring harness may cause damage to ECM or solenoid to fail.
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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.