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 MANUALSGMC1995FORWARD CONTROL 4.3 Z, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODES - 7.4LTROUBLE CODE CHARTSCODE 36, IDLE SPEED ACTUATOR FAULT - A/TNOTES
1995 GMC Forward Control 4.3 Z, Standard
Code 36, Idle Speed Actuator Fault - A/T: Notes
1995 GMC Forward Control 4.3 Z, StandardSECTION Notes
Control module grounds solenoid circuit when coolant temperature is within range to enable solenoid, allowing vacuum to retract solenoid actuator. This lowers idle speed to controlled IAC idle specification.
NOTE:
Test numbers refer to numbers on diagnostic chart.
- Checks if vacuum source is present.
- Checks to see if actuator is commanded on.
- Checks for power, ground and proper connections at actuator solenoid.
- Checks for open ground circuit.
- Checks for open driver circuit or faulty control module.
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.