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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSMERCURY1991TRACER BASE, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 29 (ENGINE CONTROLS - TESTS W/CODES - EEC 2.5L)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 1994 Ford Probe. However, it is still accessible from the selected car via links, so may be relevant.
Switch must be checked in ON (closed) and OFF (open) positions. Switch should function as follows:
- ACS Switch is closed when A/C is on and blower is operating.
- BLMT Switch is closed with fan selector switch in 3rd or HI position.
- CCPS Switch is closed with A/C on and system pressure within normal operation range.
- HPS Switch is closed with A/C on and system pressure exceeding normal operating range.
- IDL Switch is open when throttle is depressed.
- CPP/PNP CPP switch is closed when clutch pedal is depressed. PNP switch is closed when transaxle is in Neutral.
- PSP Switch is closed when system pressure is high (turn steering wheel sharply with engine on).
- WOT Switch is closed when throttle is open.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.