Diagnostic Aids
Check Gray/White wire for a short to ground. Ensure coolant system is functioning properly. Ensure engine is not overheating or has been subjected to conditions which will cause engine to run too hot, such as trailer towing. Use the Coolant Temperature Sensor Temperature To Resistance Values table to diagnose a shifted sensor which could cause poor driveability. If code is intermittent, refer to TESTS W/O CODES article.