Chrysler PT Cruiser 2001 Service Manual Supplement page 2528

DRIVEABILITY - GAS
Symptom:
P0125-CLOSED LOOP TEMP NOT REACHED
When Monitored and Set Condition:
P0125-CLOSED LOOP TEMP NOT REACHED
When Monitored: With battery voltage greater than 10.4 volts and after the engine has
been running for ten minutes.
Set Condition: The engine temperature does not go above 15°C (60°F) after 10 minutes of
engine run time.
THERMOSTAT
ECT SENSOR (OUT OF CALIBRATION/HIGH RESISTANCE IN RELATED CIRCUIT)
LOW COOLANT LEVEL
ECT WIRING HARNESS INTERMITTENT
TEST
1 Turn the ignition on.
With the DRB, read the PCM DTCs.
Is the Good Trip Counter for P0125 displayed and equal to zero?
Yes → Go To 2
→ Go To 5
No
2 Note: The best way to diagnose this DTC is to allow the vehicle to remain
outside overnight in order to have a completely cold soaked engine.
Note: Extremely cold outside ambient temperatures may cause this DTC to
set.
Warning: Never open the cooling system when the engine is hot. The system
is under pressure. Extreme burns or scalding may result. Allow the engine
to cool before opening the cooling system.
Using the procedure in the Service Information, check the coolant system to make
sure that the coolant is in good condition and at the proper level.
Is the coolant level and condition OK?
Yes → Go To 3
→ Adjust coolant level as necessary.
No
POSSIBLE CAUSES
ACTION
68
APPLICABILITY
All
All