Reducing Agent Metering System Control Module (J880)

Reducing Agent Metering System Control Module (J880)

Observe all safety precautions: => [ Safety Precautions ] Generic Scan Tool

View clean working conditions: => [ Clean Working Conditions ] Clean Working Conditions

Prior to repair work, perform a preliminary check to verify the condition. Refer to => [ Preliminary Check ] 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, testers and auxiliary items required

• Multimeter.

• Wiring diagram.

Test requirements

• The reducing agent metering system control module -J880- is located on the right side under the rear bench seat, directly below the floor covering.

• Press the floor covering to the side and disconnect the connector -1-.






• The ignition switched off.

Checking voltage

- Turn the ignition switch ON.

- Measure the voltage of the Reducing Agent Metering System Control Module (J880) harness connector (female terminals) T30/30 to Ground.

Specified value: 12.5 V (+/- 0.9 V)

- Measure the voltage of the Reducing Agent Metering System Control Module (J880) harness connector T30/25 to Batt. plus.

Specified value: 12.5 V (+/- 0.9 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 Manual.

- Using a multimeter, check the Reducing Agent Metering System Control Module (J880) electrical harness connector to the Engine Control Module (ECM) (J623) electrical harness T91 connector for resistance.






Specified value: 1.5 ohms 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 manual for removal and installation procedures.

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 ] Diagnostic Modes 01 - 09.

2. If necessary, erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Modes 01 - 09.

3. If the DTC memory was erased, generate readiness code. Refer to => [ Readiness Code ] Programming and Relearning.