Reducing Agent Heater Control Module -J891-, CHECKING
General Description
The Reducing Agent Heater Control Module -J891- controls the reducing agent heaters.
The Reducing Agent Heater Control Module -J891- contains the following components:
- Reducing Agent Heater Control Module -J891-
- Reducing Agent Line Heater (Heating Circuit 2) -Z104-
The Reducing Agent Heater Control Module -J891- components cannot be serviced separately, and must be serviced as a unit.
Special tools and workshop equipment required
- Multimeter.
- Wiring Diagram.
- Scan Tool.
Test Requirements
- Fuses OK.
- Battery voltage OK.
- Switch OFF all electrical and electronic accessories.
- Vehicles with Auto. Transmission, ensure Selector Lever position is in "P".
- Vehicles with Man. Transmission, ensure Shifter Lever position is in "N" with Parking Brake applied.
- Observe all safety precautions, refer to SAFETY PRECAUTIONS
.
- View clean working conditions, refer to CLEAN WORKING CONDITIONS
.
- For Hybrid vehicles refer to: HIGH VOLTAGE SYSTEM GENERAL WARNINGS
.
Test Procedure
| Step |
Procedure |
Result / Action to Take |
| 1 |
- PERFORM: Preliminary Check to verify the customers complaint. Refer to PRELIMINARY CHECK
.
-- Was Complaint verified? |
-- YES:
-- NO:
- GATHER more information from customer about the complaint.
|
| 2 |
- IGNITION: OFF.
- DISCONNECT: Reducing Agent Heater Control Module -J891- harness connector.
- IGNITION: ON.
- CHECK: Reducing Agent Heater Control Module -J891- harness connector terminals 3 and 5 to ground for voltage.
- IGNITION: OFF.
- SPECIFIED VALUE: Battery voltage.
-- Were Values obtained? |
-- YES:
-- NO:
- PERFORM: Visual Inspection of wiring and component.
- CHECK: Wiring for open, high resistance, short or harness connector for damage, corrosion, loose or broken terminals.
- REPAIR: Faulty wiring or connector.
- GO TO: Step 4
|
| 3 |
- REMOVE: Engine Control Module -J623-. Refer to appropriate repair information.
- CHECK: Reducing Agent Heater Control Module -J891- harness connector 1 to the Engine Control Module -J623- harness connector T94 / 41 for resistance.
- CHECK: Reducing Agent Heater Control Module -J891- harness connector 2 to the Engine Control Module -J623- harness connector T94 / 31 for resistance.
- CHECK: Reducing Agent Metering System Control Module -J880- harness connector 3 to the Engine Control Module -J623- harness connector T94 / 40 for resistance.
- CHECK: Reducing Agent Metering System Control Module -J880- harness connector 4 to the Engine Control Module -J623- harness connector T94 / 9 for resistance.
- SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω).
-- Were Values obtained? |
-- YES:
- REPLACE: Reducing Agent Heater Control Module -J891-. Refer to appropriate repair information.
- GO TO: Step 4
-- NO:
- PERFORM: Visual Inspection of wiring and component.
- CHECK: Wiring for open, high resistance, short or harness connector for damage, corrosion, loose or broken terminals.
- REPAIR: Faulty wiring or connector.
- GO TO: Step 4
|
| 4 |
- Final Procedure
- Perform a road test to verify repair.
-- Does the original DTC return? |
-- YES:
- CHECK: Engine Control Module -J623- harness connector for any damaged, pushed-out pins.
- REPAIR: As necessary.
- If all electrical connections are OK:
- REPLACE: Engine Control Module -J623-. Refer to appropriate repair information.
- Clear the DTC's. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY
.
- Repair is complete. Generate Readiness Code. Refer to READINESS CODE
.
- Return vehicle to Customer.
-- NO:
- Perform the diagnostic procedure for any DTC's.
- If no DTC's return the repair is complete.
- Return vehicle to customer.
|