Reducing Agent Metering System Pressure Sensor -G686-, 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/17 electrical harness connector located on the left side frame rail directly above the rear axle.
Polarity of the multimeter leads MUST be followed per instructions or the readings will be incorrect leading to misdiagnosis.
Checking resistance
-- Measure the resistance of the Reducing Agent Metering System Pressure Sensor -G686- harness connector (male terminals) by connecting the RED multimeter lead to T8/7 and the BLACK lead to T8/8.
Specified value: 8.70 M Ohms (+/- 1 M Ohm)
If the any 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 Reducing Agent Metering System Pressure Sensor -G686- harness connector (female terminals) T17/14 to T17/1.
Specified value: 5.01 V (+/- 0.9 V)
If the specified value was Not obtained:
-- Check the wiring for a short circuit to each other, Battery voltage, 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 -J623-. Refer to the Repair Manual.
-- Using a multimeter, check the Reducing Agent Metering System Pressure Sensor -G686- electrical harness connector to the Engine Control Module -J623- electrical harness T91 connector for resistance.
| Reducing Agent Metering System Pressure Sensor -G686- electrical harness connector (female terminals) | Engine Control Module -J623- electrical harness connector terminals |
|---|---|
| T17/14 | T91 / 89 |
| T17/1 | T91 / 17 |
Specified value: 1.5 Ω Max.
If the specified value was not obtained:
-- Check the wiring for a short circuit to each other, Battery voltage, 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 -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 .