Chrysler 300M 2002 Service Manual page 2500

Symptom:
P0118-ENGINE COOLANT TEMPERATURE SENSOR HIGH
When Monitored and Set Condition:
P0118-ENGINE COOLANT TEMPERATURE SENSOR HIGH
When Monitored: With the ignition on. Battery voltage greater than 10 volts.
Set Condition: The Engine Coolant Temperature (ECT) sensor voltage at the PCM is
greater than 4.98 volts. One trip Fault.
INTERMITTENT CONDITION
ECT SENSOR SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
ECT SENSOR INTERNAL FAILURE
ECT SENSOR SIGNAL CIRCUIT OPEN
SENSOR GROUND CIRCUIT OPEN
PCM
TEST
1 Ignition on, engine not running.
With the DRBIII , read the ECT voltage.
Is the voltage above 4.6 volts?
Yes → Go To 2
No
2 Turn the ignition off.
Disconnect the ECT Sensor harness connector.
Ignition on, engine not running.
Measure the voltage of the ECT Sensor Signal circuit in the ECT Sensor harness
connector.
Is the voltage above 5.2 volts?
Yes → Repair the short to battery voltage in the ECT Sensor Signal
No
POSSIBLE CAUSES
ACTION
→ Go To 7
circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
→ Go To 3
DRIVEABILITY - NGC
71
APPLICABILITY
All
All