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 MANUALSCADILLAC1993SEVILLE BASEREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODES - PCMPFI CHARTSPFI CHART C-7 - IDLE SPEED CONTROL (ISC) CHECK
1993 Cadillac Seville Base
PFI Chart C-7 - Idle Speed Control (ISC) Check
1993 Cadillac Seville BaseSECTION PFI Chart C-7 - Idle Speed Control (ISC) Check
This test verifies ISC motor operation and checks ISC plunger adjustment.
NOTE:
Test numbers refer to numbers on diagnostic chart.
- This checks for a high minimum air idle which could cause a sail-on condition. Minimum air idle should be 450-500 RPM.
- Perform PCM Code P030 diagnosis to identify cause of faulty ISC motor.
- This determines ISC motor ability to reach maximum extension. At maximum extension, PCM data PD01 will read 13.0-13.8 degrees if ISC does not adjust to within range.
- TP sensor idle learn procedure must be performed after ISC plunger adjustment.
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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.