Pinpoint Test C: The Engine Does Not Reach Normal Operating Temperature

C1 CHECK THE ENGINE TEMPERATURE
- Start the engine and allow to run while observing ECT until the engine cooling fans engage (may require 30-40 minutes to reach ECT of approximately 103°C (218°F)).
- Note any change in the ECT reading while the fans are running and shortly after they turn off.
- Did the ECT drop by 10-14°F during this period?
  - Yes : REFER to INSTRUMENT CLUSTER AND PANEL ILLUMINATION for diagnosis of the engine coolant temperature gauge.
  - No : INSTALL a new thermostat. TEST the system for normal operation.