Test KE: Step 15

15) Code 13: Verify Idle Speed is Within Specification  Code 13 indicates engine could not be controlled within lower RPM range during self-test. Possible causes for this fault are:

• Incorrect idle setting
• Vacuum leaks
• Sticking or binding throttle linkage
• Throttle plates open
• Incorrect ignition timing (TFI ignition only)
• Throttle body or ISC solenoid contamination
• ISC circuit shorted to ground
• Faulty ISC solenoid

If all of the above components are okay and idle is set to specification, remove ISC solenoid and inspect for contamination. Service as necessary and rerun QUICK TEST. If code or symptom is still present, replace ISC solenoid. If idle speed is not set to specification, reset and rerun QUICK TEST. If idle speed cannot be reset to specification, go to next step.