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.
Relay Output Check
| Switch | PCM Pin | BOB Pin | Wire Color |
|---|---|---|---|
| ACR | 1F | 30 | WHT |
1) Turn ignition off. Install BOB, leaving PCM connected. Turn ignition on. Ground appropriate test pin at BOB. Listen for clicking from suspect relay. If relay does not click, go to next step. If relay clicks, ROC is okay. If sent here from QUICK TEST, return to WIGGLE TESTS; otherwise temporarily substitute known good PCM and retest.
2) Turn ignition off. Inspect for shorts or grounds in wire between appropriate relay connector and BOB test pin. Repair wire as necessary. If no problems are found, go to next step.
3) Turn ignition off. Disconnect suspect relay. Turn ignition on. Measure voltage at power terminal of relay connector. If voltage is more than 10 volts, replace relay. If voltage is less than 10 volts, repair power wire.
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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.
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