Exhaust Door Control Unit -J883-, Checking
General Description
The Exhaust Throttle Valve is located behind the NOx storage catalytic converter. There is an electric motor inside of the Exhaust Throttle Valve that moves the throttle plate with a gear. Adjustment of the throttle plate is infinite and can be adapted to respective load and speed of the engine. The Exhaust Throttle Valve has the following tasks: In certain operating conditions, a differential pressure is generated between the NOx storage catalyst and the turbocharger. This increase in pressure helps with Low Pressure EGR return.
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
.
| Step |
Procedure |
Result / Action to Take |
| 1 |
- PERFORM: Preliminary Check to verify the customers complaint. Refer to PRELIMINARY CHECK
.
-- Was Complaint verified? |
- NO:
- GATHER more information from customer about the complaint.
|
| 2 |
- IGNITION: OFF.
- DISCONNECT: Exhaust Door Control Unit -J883- harness connector.
- IGNITION: ON.
- CHECK: Exhaust Door Control Unit -J883- harness connector terminals 1 to 2 for voltage.
- IGNITION: OFF.
- SPECIFIED VALUE: About 5.0 V.
-- Was Value obtained? |
|
| 3 |
- REMOVE: Engine Control Module - J623-. Refer to appropriate repair information.
- CHECK: Exhaust Door Control Unit -J883- harness connector terminal 3 to the Engine Control Module - J623- harness connector T94 / 37 for resistance.
- CHECK: Exhaust Door Control Unit -J883- harness connector terminal 4 to the Engine Control Module - J623- harness connector T94 / 7 for resistance.
- CHECK: Exhaust Door Control Unit -J883- harness connector terminal 5 to the Engine Control Module - J623- harness connector T94 / 29 for resistance.
- SPECIFIED VALUE:0.5 Ω (± 0.3 Ω).
-- Were Values obtained? |
- YES:
- REPLACE Exhaust Door Control Unit -J883-. Refer to appropriate repair information.
- GO TO: Step 5
- 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 5
|
| 4 |
- REMOVE: Engine Control Module - J623-. Refer to appropriate repair information.
- CHECK: Exhaust Door Control Unit -J883- harness connector terminal 1 to the Engine Control Module - J623- harness connector T94 / 13 for resistance.
- CHECK: Exhaust Door Control Unit -J883- harness connector terminal 2 to the Engine Control Module - J623- harness connector T94 / 58 for resistance.
- SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω).
-- Were Values obtained? |
- YES:
- REPLACE Exhaust Door Control Unit -J883-. Refer to appropriate repair information.
- GO TO: Step 5
- 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 5
|
| 5 |
- 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.
|