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.

For wiring diagrams, component locations, and connector views, Refer to the applicable wiring diagram.

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-. Refer to the Repair information.

-- 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 according to the wiring diagram.

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-. Refer to the Repair information.

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 .