Chrysler 300M 2002 Service Manual page 2515

DRIVEABILITY - NGC
Symptom:
P0128-THERMOSTAT RATIONALITY
When Monitored and Set Condition:
P0128-THERMOSTAT RATIONALITY
When Monitored: The engine running.
Set Condition: The PCM predicts a coolant temperature value that it will compare to the
actual coolant temperature. If the two coolant temperature values are not within 10°C
(18°F) of each other an error is detected. Two Trip Fault.
COOLANT LEVEL
THERMOSTAT
TEST
1 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.
Check the coolant mixture and the coolant level.
If coolant level is low, check for visible leaks or perform a pressure test on the coolant
system.
Was the coolant level low or where any leaks found?
Yes → Repair the coolant leak and/or fill coolant to the proper level.
→ Replace the thermostat and fill coolant level to the proper level.
No
POSSIBLE CAUSES
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 2.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
86
APPLICABILITY
All