Reducing Agent Injector -N474-, CHECKING
Function
The Reducing Agent Injector -N474- is actuated by a pulse width modulated signal from the Engine Control Module -J623- introducing Reducing Agent into the DeNox catalytic converter.
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 Manual 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 |
- REMOVE: Reducing Agent Injector -N474-. Refer to appropriate repair information.
- CHECK: Reducing Agent Injector -N474- component connector terminals 1 to 2 for resistance.
- SPECIFIED VALUE: 12.6 Ω (+/- 3 Ω)
-- Was Value obtained? |
-- YES:
-- NO:
- REPLACE: Reducing Agent Injector -N474-. Refer to appropriate repair information.
- GO TO: Step 4
|
| 3 |
- REMOVE: Engine Control Module - J623-. Refer to appropriate repair information.
- CHECK: Reducing Agent Injector -N474- harness connector terminal 1 to the Engine Control Module - J623- harness connector T94 / 52 for resistance.
- CHECK: Reducing Agent Injector -N474- harness connector terminal 2 to the Engine Control Module - J623- harness connector T94 / 51 for resistance.
- SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω)
-- Were Values obtained? |
-- YES:
- REPLACE: Reducing Agent Injector -N474-. 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.
|