ECT Sensor - Hard/No Start In Low Ambient Temperatures

NO.:
18-08-92

GROUP:
Driveability

DATE:
Jun. 29, 1992



SUBJECT:
Hard/No Start In Low Ambient Temperatures



THIS BULLETIN APPLIES TO VEHICLES EQUIPPED WITH A 3.3L/3.8L ENGINE.


MODELS:
1992 (AC) Dynasty/New Yorker Salon
(AS) Caravan/Grand Caravan/Caravan C/V
Voyager/Grand Voyager/Town & Country
(AY) Imperial/New Yorker Fifth Avenue


SYMPTOM/CONDITION:

Vehicles may be hard to start or will not start in cool to cold ambient temperatures. This condition may be caused by the Engine Coolant Temperature (ECT) Sensor and wiring connector ingesting water and becoming corroded. A corroded ECT sensor/connector will cause an abnormally high temperature reading, making it difficult to start the vehicle.


DIAGNOSIS:

Check for a diagnostic trouble code (fault code) 22 or an abnormally high temperature reading. If either are found, inspect the Engine Coolant Temperature (ECT) Sensor wiring connector cavity for corrosion (the sensor is located below the ignition coil). If corrosion is present, perform the following procedure.


PARTS REQUIRED:

1 Sensor, Engine Coolant Temperature (ECT) 33004281
1 Wiring Repair Pigtail 4414901
1 Heat Shrink Tubing Package 4419644


REPAIR PROCEDURE:

This bulletin involves replacing the Engine Coolant Temperature (ECT) Sensor and related wiring connector with revised components.



1. With the ignition in the OFF position, disconnect the battery negative cable.


2. Replace the Engine Coolant Temperature (ECT) Sensor with PN 33004281, as outlined in the appropriate service manual, Section 8D - Ignition Systems.

3. Cut off the old ECT sensor wiring harness connector within one inch of the connector.

4. Strip one inch of insulation from the remaining wire and slide a piece of heat shrink tubing, PN 4419644, onto each wire .

5. Strip one inch of insulation from the wires on the repair pigtail, PN 4414901.

6. Match wire colors and twist the two bare ends around each other.

7. Solder the joint together using a ROSIN CORE SOLDER. Center the heat shrink tubing over the joint and heat using a heat gun. Heat the joint until the tubing is tightly sealed and sealant comes out of both ends of heat shrink tubing.

8. Connect the ECT sensor wiring and battery negative terminal.


POLICY:
Reimbursable within the provisions of the warranty.


TIME ALLOWANCE:

Labor Operation No. 08-14-20-90 . . . . . . 0.6 Hrs.


FAILURE CODE:
21 - Connection Defect