EGR Cooler Switch Over Valve 1-2 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
- Ignition switched off
The EGR Cooler Switch Over Valve 1-2 are solenoids that control vacuum motors to each EGR cooler (main and auxiliary). The N345 (solenoid) is located on top of the engine to the left (drivers side) of center. N 381 (solenoid) is located on the left (drivers side) at the rear of the cylinder head.
Test procedure
-- Disconnect the EGR Cooler Switch Over Valve 1 or 2 -N345/N381- harness connector.
-- Turn the ignition switch ON.
-- Measure the resistance of the 2 terminals of the EGR Cooler Switch Over Valve 1 or 2 -N345/N381- connector.
Specified value: 35.2 ohms (+/- 6 ohms).
If the specified value was not obtained:
-- Replace the EGR Cooler Switch Over Valve 1 or 2 -N345/N381-. Refer to the Repair information.
If the specified value was obtained:
Checking voltage
-- Connect the voltmeter to terminal 1 of the EGR Cooler Switch Over Valve 1 or 2 -N345/N381- harness connector and ground black lead to engine ground.
Specified value: 11.60 V (+/- 1.5 V).
If the specified value was obtained:
-- Connect the voltmeter to terminal 2 of the EGR Cooler Switch Over Valve 1 or 2 -N345/N381- harness connector and ground black lead to engine ground.
Specified value: 3.48 V (+/-.5 V).
If any of the specified values were Not obtained:
Checking wiring
-- Remove the Motronic Engine Control Module (ECM) -J623-. Refer to the Repair information.
-- Using a multimeter, check the EGR Cooler Switch Over Valve 1 or 2 -N345/N381- electrical harness connector terminals to the Motronic Engine Control Module (ECM) -J623- electrical harness connector T94 connector for resistance.
| Component | EGR Cooler Switch Over Valve -- electrical harness connector terminals | Motronic Engine Control Module (ECM) -J623- electrical connector terminals or fuse location |
|---|---|---|
| EGR Cooler Switch Over Valve 1 -N345- | 1 | Fuse S-10 |
| 2 | T94/47 | |
| EGR Cooler Switch Over Valve 2 -N381- | 1 | Fuse S-10 |
| 2 | T94/49 |
Specified value: 1.5 ohms Max.
If any of the specified values were Not obtained:
-- Check the wires for a short circuit to each other, a short to battery voltage, or a short to ground.
-- Check the electrical harness connector for damage, corrosion, loose or broken terminals.
-- Repair as necessary.
If no malfunction is detected in electrical circuit and the voltage was Not obtained:
-- Replace the Motronic Engine Control Module (ECM) -J623-. Refer to the Repair information for removal and installation procedures.
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 .