Test KE: Step 26

26) Code 17: ISC RPM Low  Code 17 indicates that with the ISC off, engine RPM was below self-test limit. Possible causes for this fault are:

• Excessive engine accessory load
• Engine temperature below normal operating temperature
• Throttle body/air inlet contamination
• Incorrect idle adjustment

Check and correct excessive engine load conditions, cooling fans, lights, etc. Run engine at 2000 RPM for 2 minutes, or until top radiator hose is hot and pressurized. Turn key off and wait 10 seconds. Rerun KOER Self-Test. If Code 17 is displayed, inspect throttle body and air inlet for contamination and clean as necessary. If okay, adjust base/curb idle speed and repeat QUICK TEST. If Code 17 is not displayed, service other codes as necessary.