Chrysler 300M 2002 Service Manual page 2501

DRIVEABILITY - NGC
P0118-ENGINE COOLANT TEMPERATURE SENSOR HIGH —
TEST
3 Turn the ignition off.
Disconnect the ECT harness connector.
Connect a jumper wire between the ECT Sensor Signal circuit and the Sensor ground
circuit in the ECT harness connector.
Ignition on, engine not running.
With the DRBIII , read ECT voltage.
Is the voltage below 1.0 volt?
Yes → Replace the ECT Sensor.
No
4 Turn the ignition off.
Disconnect the ECT Sensor harness connector.
Disconnect the PCM harness connector.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Measure the resistance of the ECT Sensor Signal circuit from the ECT Sensor
harness connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
Yes → Go To 5
No
5 Turn the ignition off.
Disconnect the ECT Sensor harness connector.
Disconnect the PCM harness connector.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Measure the resistance of the Sensor ground circuit from the ECT Sensor harness
connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
Yes → Go To 6
No
6 NOTE: Before continuing, check the PCM harness connector terminals for
corrosion, damage, or terminal push out. Repair as necessary.
If there are no possible causes remaining, view repair.
Repair
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 5.
→ Go To 4
→ Repair the open in the ECT Sensor Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
→ Repair the open in the Sensor ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
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Continued
APPLICABILITY
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