Engine Temperature Control Temperature Sensor

Engine Temperature Control Temperature Sensor

• Use only gold-plated terminals when servicing terminals in the electrical harness connector of the Engine Temperature Control Temperature Sensor (G694).

Special tools, testers and auxiliary items required

• Multimeter.

• Wiring diagram.

Test requirements

• The Motronic Engine Control Module (ECM) (J623) fuses OK.

• Battery voltage at least 12.5 volts.

• All electrical consumers such as, lights and rear window defroster, switched off.

• Vehicles with automatic transmission, shift selector lever into position "P" or "N".

• A/C switched off.

• Ground (GND) connections between engine/transmission/chassis OK.

• Ignition switched off.

Checking internal resistance

- Remove the right lower section of the intake manifold.

- Disconnect the Engine temperature control sensor (G694) electrical harness connector.- 2 -






- Using a Multimeter, check the Engine temperature control sensor (G694) terminals 1 to 2 for resistance.






Specified value:.050ohms to 10K ohms

If the specified value was not obtained:

- Replace the Engine temperature control sensor (G694). Refer to appropriate service manual.

- Go to Final procedures

If the specified value was obtained:

Checking wiring

- Remove the Motronic Engine Control Module (ECM) (J623). Refer to appropriate service manual.

- Using a Multimeter, check the Engine temperature control sensor (G694) electrical harness connector terminals to the Motronic Engine Control Module (ECM) (J623) electrical harness connector T94 terminals for an open circuit.











Specified value: 1.5 ohms Max.

If the specified value was not obtained:

- Check the wiring for a short circuit to Battery voltage or an open circuit.

- Check the electrical harness connector for damage, corrosion, loose or broken terminals.

- If necessary, repair the faulty wiring connection.

- Go to Final procedures

If the specified value was obtained:

- Replace the Motronic Engine Control Module (ECM) (J623). Refer to the appropriate service manual.

Final procedures

- Reinstall the engine cover with air filter, if necessary. Refer to the appropriate service manual.

- After the repair work, the following work steps must be performed in the following sequence:

1. Check the DTC memory. Refer to => [ Diagnostic Mode 03 - Read DTC Memory ] Diagnostic Modes 01 - 09.

2. If necessary, erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Modes 01 - 09.

3. If the DTC memory was erased, generate readiness code. Refer to => [ Readiness Code ] Programming and Relearning.