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 MANUALSMERCURY1991TRACER BASE, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 3 (ENGINE CONTROLS - TESTS W/CODES - EEC)CIRCUIT TESTSCIRCUIT TEST STG - SWITCH TO GROUNDSWITCH PERFORMANCE CHECK
1991 Mercury Tracer Base, 4D Sedan, Automatic
Switch Performance Check
1991 Mercury Tracer Base, 4D Sedan, AutomaticSECTION Switch Performance Check
WARNING: This page is about a different car, the 1992 Mercury Tracer, 1992 Ford Probe, and 1992 Ford Escort. However, it is still accessible from the selected car via links, so may be relevant.
Switch must be checked in ON and OFF positions. Switch should function as follows:
- ACS Switch is closed when A/C button is on and blower is operating.
- BLMT Switch is closed in every position except OFF.
- CES/NGS CES switch is closed when clutch pedal is up. NGS switch is closed when transaxle is in Neutral.
- IDL Switch is open when throttle is depressed.
- PSPS Switch is open when system pressure is less than 245 psi (16.9 kg/cm2 ). Switch is closed when system pressure is greater than 290 psi (20.0 kg/cm2 ).
- WOT Switch is closed when throttle is open.
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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.