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.
Switch Test E.7.2 - ISC Throttle Switch
After .7.0 is displayed on FDC, PCM switch test can be initiated by depressing brake pedal. When brake pedal has been depressed, FDC will display E.7.0. At this time the HI and LO buttons on ECC panel can be used to select specific switch test.
When a specific test has been selected and that switch activated, display will alternately display code for that test and E.0.0 to confirm that switch is working.
This test detects opening and closing of ISC nose switch at PCM terminal A7.
- Throttle body must be removed to disconnect ISC jumper from ISC. Using DVOM, check jumpers for open or shorted circuit and ISC switch for continuity.
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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.