Reduction Agent Reversing Valve Checking
Observe all safety precautions: SAFETY PRECAUTIONS
View clean working conditions: CLEAN WORKING CONDITIONS
Prior to repair work, perform a preliminary check to verify the condition. Refer to PRELIMINARY CHECK .
At the time of writing, the Reduction Agent Tank Module Assembly is replaced as a unit when an individual component of the module assembly is faulty. This may change at a later date. Check with parts for availability of components.
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.
- Wiring diagram.
Test requirements
- The ignition switched off.
Start diagnosis
-- Disconnect the T/8 electrical harness connector located on the left side frame rail directly above the rear axle.
Checking resistance
-- Using a multimeter, measure the resistance of the Reduction Agent Reversing Valve -N473- terminals T8/1 to T8/3 (male terminal connector).
Specified value: 11.4 Ω (+/- 2.5 ohms)
If the specified value was not obtained, replace the Reduction Agent Tank Module Assembly.
If the specified value was obtained:
Checking voltage
-- Turn the ignition switch ON.
-- Measure the voltage of the Reduction Agent Reversing Valve -N473- harness connector (female terminals) T8/1 to Ground.
Specified value: 3.48 V (+/- 0.9 V)
-- Measure the voltage of the Reduction Agent Reversing Valve -N473- harness connector (female terminals) T8/3 to Ground.
Specified value: 11.40 V (+/- 2.5 V)
If any of the specified values were Not obtained:
-- Check the wiring for a short circuit to each other, Battery positive, Ground or high resistance.
-- If necessary, repair the faulty wiring connection.
-- Check the electrical harness connector for damage, corrosion, loose or broken terminals.
If the specified value was obtained:
Checking wiring
-- Remove the Engine Control Module (ECM) -J623-. Refer to the Repair information.
-- Using a multimeter, check the Reduction Agent Reversing Valve -N473- electrical harness connector to the Engine Control Module (ECM) -J623- electrical harness T94 connector for resistance.
| Reduction Agent Reversing Valve -N473- electrical harness connector (female terminals) | Engine Control Module (ECM) -J623- electrical harness connector terminals or fuse location |
|---|---|
| 1 | T60 / 30 |
| 3 | Fuse S-14 |
Specified value: 1.5 Ω Max.
If the specification was not obtained:
-- Check the wiring for a short circuit to each other, Battery positive, Ground or high resistance.
-- If necessary, repair the faulty wiring connection.
-- Check the electrical harness connector for damage, corrosion, loose or broken terminals.
If no malfunction is detected in the wiring and the voltage readings were Not correct:
-- Replace the Engine Control Module (ECM) -J623-. Refer to the service 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 .