Reducing Agent Pump Heater, Checking

Reducing Agent Pump Heater, Checking

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.

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 ignition switched off.

Start diagnosis

- Remove the Reduction Agent Tank Module assembly. The module is located above the rear muffler mounted below the spare tire well. Refer to the Repair Manual for removal instructions.

- Disconnect the electrical harness connector from the Reducing Agent Pump Heater (Z103).

Checking resistance

- Measure the resistance of the Reducing Agent Pump Heater (Z103) terminals T8/5 and T8/6.

Specified value: 2.4 Ohms (+/- 1 Ohm)

If the specified value was Not obtained replace the Reducing Agent Pump Heater (Z103).

If the specified value was obtained:

Replace the Reduction Agent Tank Module assembly.

Checking wiring

- Remove the Engine Control Module (ECM) (J623). Refer to the Repair Manual.

- Using a multimeter, check the Reducing Agent Pump Heater (Z103) electrical harness connector to the Reducing Agent Metering System Control Module (J880) electrical harness T30 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.