Late Production (NGC)

Test 1:

Test 2 - 3:

SYMPTOM
P0125-INSUFFICIENT COOLANT TEMP FOR CLOSED-LOOP FUEL CONTROL

WHEN MONITORED
With battery voltage greater than 10.4 volts, after engine is started.

SET CONDITION
The engine temperature does not enable closed loop. Failure time depends on start-up coolant temperature and ambient temperature. (i.e. 2 minutes for a start temp of 10° C (50° F) or up to 10 minutes for a vehicle with a start-up temp of -28° C (-18° F). Two Trip Fault.

POSSIBLE CAUSES
- Low coolant level
- Thermostat operation
- Engine coolant temperature sensor