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.
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:
- Check the DTC memory. Refer to DIAGNOSTIC MODE 03 - READ DTC MEMORY .
- If necessary, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
- If the DTC memory was erased, generate readiness code. Refer to READINESS CODE .
Use the Manual With the Right Hardware
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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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