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 MANUALSVOLKSWAGEN1991JETTA L4-1984CC 2.0L DOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTHROTTLE FULL CLOSE SWITCHADJUSTMENTS
1991 Volkswagen Jetta L4-1984cc 2.0L DOHC
Throttle Full Close Switch: Adjustments
1991 Volkswagen Jetta L4-1984cc 2.0L DOHCSECTION Adjustments
Throttle Switches
Check the idle switch by checking for continuity at connector terminals 1 and 2. The circuit should be closed when the throttle is at rest, switching open as the throttle is opened slightly. To precisely check or adjust the idle switch, open the throttle valve about half-way and slowly let it close. The idle switch should close, completing the circuit, when the gap between the throttle valve lever and its stop is 0.15 to 0.4 mm (.006 to .016 in.). Check the gap with a feeler gauge as shown in image above.
Check the idle switch by checking for continuity at connector terminals 1 and 2. The circuit should be closed when the throttle is at rest, switching open as the throttle is opened slightly. To precisely check or adjust the idle switch, open the throttle valve about half-way and slowly let it close. The idle switch should close, completing the circuit, when the gap between the throttle valve lever and its stop is 0.15 to 0.4 mm (.006 to .016 in.). Check the gap with a feeler gauge as shown in image above.
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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.