Chrysler PT Cruiser 2001 Service Manual Supplement page 2613

Symptom:
P1281-ENGINE IS COLD TOO LONG
When Monitored and Set Condition:
P1281-ENGINE IS COLD TOO LONG
When Monitored: With the ignition key on, the engine running, the ambient temperature
above -24° C (-11° F), and the startup coolant temperature above -7° C (20° F) but below
100° C (212° F).
Set Condition: The engine does not warm to 71° C (160° F) while driving for 20 minutes
after start.
COOLING SYSTEM PROBLEM
TEST
1 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.
Verify that the coolant level is not low and correct as necessary.
Start the engine
NOTE: Verify the ECT Sensor is functioning properly before proceeding.
With the DRB, set the engine RPM to 1500 and allow the engine to warm up for 10-15
minutes.
With the DRB, monitor the ENG COOLANT TMP DEG value during the warm up
cycle. Make sure the transition of temperature change is smooth.
Did the engine temperature reach a minimum of 71° C (160° F)?
Yes → Test Complete.
→ Refer to the Service Information for cooling system performance
No
POSSIBLE CAUSES
ACTION
diagnosis. The most probable cause is a Thermostat problem.
Also, refer to any related TSBs.
DRIVEABILITY - GAS
153
APPLICABILITY
All