Checking Wiring
-- Using a multimeter, measure the resistance of the circuit between the Reducing Agent Pump -V437- / Reducing Agent Pump Heater -Z103- harness connector and the specified component or terminal. Refer to the applicable wiring diagram.
| Reducing Agent Pump -V437- / Reducing Agent Pump Heater -Z103- electrical harness T5n connector terminal: | Measure To: |
|---|---|
| 3 | Fuse, Refer to applicable wiring diagram for fuse location and number. |
| 4 | Ground |
Specified value: 1.5 Ω Max.
If the specification was Not obtained:
-- Check the wiring for a short circuit to ground, high resistance or an open circuit.
-- Check the electrical harness connector for damage, corrosion, loose or broken terminals.
-- If necessary, repair the wiring or connections and replace any open fuses.
-- Go to Final Procedures
If the specified value was obtained:
-- Remove the Engine Control Module (ECM) - J623 -. Refer to appropriate service information.
-- Using a Multimeter, Check the Reducing Agent Pump -V437- / Reducing Agent Pump Heater -Z103- electrical harness connector to the Engine Control Module (ECM) - J623 - electrical harness connector T94 for an open circuit.
| Reducing Agent Pump -V437- / Reducing Agent Pump Heater -Z103- electrical harness connector terminals | Engine Control Module (ECM) - J623 - electrical harness connector T94 terminals |
|---|---|
| 5 | 28 |
Specified value: 1.5 Ω Max.
If the specified value was Not obtained:
-- Check the wiring connection for an open circuit, short circuit to Battery positive or Ground
-- Check the wiring connection for damage, corrosion, loose or broken terminals.
-- If necessary, repair the faulty wiring connection.
-- Go to Final Procedures
If the specified value was obtained:
If no malfunction is detected in the wiring and the voltage :
-- Replace the Engine Control Module (ECM) -J623-. Refer to the Repair Information.