EGR Temperature Sensor, Checking

Observe all safety precautions: SAFETY PRECAUTIONS 

View clean working conditions: CLEAN WORKING CONDITIONS 

Perform a preliminary check to verify the condition: PRELIMINARY CHECK .

Use only gold-plated terminals when servicing any component with gold-plated electrical harness connector terminals.

See Appropriate Wiring Diagram Information for component locations and connector views.

Special Tools And Workshop Equipment Required 

• Multimeter
• Electrical connector test lead set

Test Conditions 

• Battery voltage 12.5 V
• Fuse OK
• Engine MUST be at room temperature.
• Ignition switched Off

Test Procedure 

-- Engine MUST be at room temperature.

-- Disconnect the EGR Temperature Sensor -G98- connector.

-- Using a multimeter, check the EGR Temperature Sensor -G98- terminals 1 to 2 for resistance.

Specified Value: 6.96 K Ω (+/- 400 Ω) At Room Temperature. 

If the specified value was Not obtained: 

-- Replace the EGR Temperature Sensor -G98-

If the specified value was obtained: 

-- Turn the ignition switch ON.

-- Using a multimeter, check the EGR Temperature Sensor -G98- terminals 1 to 2 for voltage.

Specified Value: 3.32 V (+/-.4 V) 

If the specified value was Not obtained: 

-- Remove the Motronic Engine Control Module (ECM) -J623-.

-- Using a multimeter, check the EGR Temperature Sensor -G98- electrical harness connector terminals to the Motronic Engine Control Module (ECM) -J623- electrical harness connector T60 terminals for an open circuit. Refer to Appropriate Wiring Diagrams for Pin locations.

EGR Temperature Sensor -G98- electrical harness connector terminals	Motronic Engine Control Module (ECM) -J623- electrical connector T60 terminals
1	54
2	55

Specified Value: 1.5 Ω Max. 

If the specified value was Not obtained: 

-- Check the wiring for an open, high resistance or short to ground.

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

-- If necessary, repair the faulty wiring connection.

If there was no fault found in the wiring and the voltage was Not obtained: 

-- Replace the Motronic Engine Control Module (ECM) -J623-.

Final Procedures 

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 .
2. If necessary, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
3. If the DTC memory was erased, generate readiness code. Refer to READINESS CODE .