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 MANUALSMERCURY1994CAPRI XR2, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - TESTS W/CODESPINPOINT TEST STPSWITCH TO POWER

1994 Mercury Capri XR2, Automatic

Switch To Power

1994 Mercury Capri XR2, AutomaticSECTION Switch To Power

NOTE: Enter this test only when directed here from QUICK TESTS.

STP CIRCUIT PIN IDENTIFICATION

Switch

PCM Pin

BOB Pin

Wire Color

BOO

⁽¹⁾ 3

WHT/GRN

VST

⁽²⁾ 5

BLK/RED

⁽¹⁾	Battery voltage with switch closed.

⁽²⁾	Approximately 9 volts while cranking engine.

1) Turn ignition off. Install BOB, leaving PCM disconnected. Turn ignition on. Cycle switch in question. Measure voltage between switch BOB test pin and ground. If voltage is not as specified, go to next step. If voltage is approximately as specified, switch is okay. If sent here from SWITCH MONITOR TEST in QUICK TESTS, temporarily substitute known good PCM and retest. If sent here from elsewhere in QUICK TESTS, return to QUICK TESTS.

2) Turn ignition off. Unplug switch connector. Turn ignition on. Check for battery voltage at harness connector PWR wire for the switch in question. If battery voltage exists, go to next step. If battery voltage does not exist, repair open PWR wire to switch.

3) Measure resistance between switch terminals. Operate switch. If resistance is less than 5 ohms with switch closed and greater than 10,000 ohms with switch open, switch is okay. If sent here from SWITCH MONITOR TEST in QUICK TESTS, return to QUICK TESTS. If resistance is not as specified, replace switch.

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.