Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2004 Isuzu Ascender 2WD L6-4.2LFACTORY OEM SERVICE PROCEDURE
Engine Temperature Sensor: Service and Repair
Engine Coolant Temperature (ECT) Sensor Replacement
Removal Procedure
NOTE: Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system.
1. Turn the engine OFF.
2. Disconnect the negative battery terminal.
3. Drain coolant below the level of the ECT sensor. Refer to Draining and Filling Cooling System In Cooling Systems.
4. Disconnect the ECT sensor electrical connector (1).
5. Remove the drive belt and the generator.
6. Carefully remove the ECT sensor (1).
Installation Procedure
NOTE: Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system.
NOTE: Replacement components must be the correct part number for the application. Components requiring the use of the thread locking compound, lubricants, corrosion inhibitors, or sealants are identified in the service procedure. Some replacement components may come with these coatings already applied. Do not use these coatings on components unless specified. These coatings can affect the final torque, which may affect the operation of the component. Use the correct torque specification when installing components in order to avoid damage.
1. If installing the original sensor or a new sensor without sealant, apply thread sealer P/N 12346004 or equivalent.
2. Install the ECT sensor.
Tighten the ECT sensor to .........16 N.m (12 lb ft).
3. Connect the ECT electrical connector (1).
4. Install the generator and the drive belt.
5. Connect the negative battery terminal.
6. Refill the engine coolant. Refer to Draining and Filling Cooling System In Cooling Systems.
Removal Procedure
NOTE: Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system.
1. Turn the engine OFF.
2. Disconnect the negative battery terminal.
3. Drain coolant below the level of the ECT sensor. Refer to Draining and Filling Cooling System In Cooling Systems.
4. Disconnect the ECT sensor electrical connector (1).
5. Remove the drive belt and the generator.
6. Carefully remove the ECT sensor (1).
Installation Procedure
NOTE: Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system.
NOTE: Replacement components must be the correct part number for the application. Components requiring the use of the thread locking compound, lubricants, corrosion inhibitors, or sealants are identified in the service procedure. Some replacement components may come with these coatings already applied. Do not use these coatings on components unless specified. These coatings can affect the final torque, which may affect the operation of the component. Use the correct torque specification when installing components in order to avoid damage.
1. If installing the original sensor or a new sensor without sealant, apply thread sealer P/N 12346004 or equivalent.
2. Install the ECT sensor.
Tighten the ECT sensor to .........16 N.m (12 lb ft).
3. Connect the ECT electrical connector (1).
4. Install the generator and the drive belt.
5. Connect the negative battery terminal.
6. Refill the engine coolant. Refer to Draining and Filling Cooling System In Cooling Systems.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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