Throttle Valve Control Module - GX3-, Checking
General Description
Throttle valve operation occurs by an electric motor identified as EPC Throttle Drive -G186- located within the Throttle Valve Control Module -GX3-. It is controlled by the Engine Control Module - J623- with primary inputs from the Accelerator Pedal Module -GX2- as well as other peripheral inputs from EPC Throttle Drive Angle Sensor 1 -G187- and EPC Throttle Drive Angle Sensor 2 -G188-.
The Throttle Valve Control Module -GX3 / J338- contains the following components:
- EPC Throttle Drive -G186-
- EPC Throttle Drive Angle Sensor 1 -G187-
- EPC Throttle Drive Angle Sensor 2 -G188-
The Throttle Valve Control Module -GX3 / J338- 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 Manual Transmission, ensure Shifter Lever position is in "N" with Parking Brake applied.
- Coolant Temperature: ≥ 80° C.
- Observe all safety precautions: SAFETY PRECAUTIONS
.
- View clean working conditions: 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 |
- CONNECT: Scan Tool.
- IGNITION: ON.
- CHECK: Throttle valve position closed:
- SPECIFIED VALUE: 3 - 25%.
- DEPRESS: Accelerator pedal slowly to WOT while observing the percentage display. The percentage display must increase uniformly.
- CHECK: Throttle valve position at WOT:
- SPECIFIED VALUE: 84 - 97%.
- IGNITION: OFF.
-- Was Value obtained? |
-- YES:
-- NO:
|
| 3 |
- CONDITION: May be intermittent.
- 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.
|
|
| 4 |
- REMOVE: Throttle Valve Control Module - GX3- far enough so that the harness connector terminals are accessible.
- DISCONNECT: Throttle Valve Control Module - GX3- harness connector.
- IGNITION: ON.
- CHECK: Throttle Valve Control Module - GX3- harness connector terminals 2 to 6 for voltage.
- SPECIFIED VALUE: About 5.0 V.
- IGNITION: OFF.
-- Were Values obtained? |
-- YES:
-- NO:
|
| 5 |
- REMOVE: Engine Control Module - J623-. Refer to appropriate repair information.
- CHECK: Throttle Valve Control Module - GX3- harness connector terminal 1 to the Engine Control Module - J623- harness connector T60 / 28 for resistance.
- CHECK: Throttle Valve Control Module - GX3- harness connector terminal 3 to the Engine Control Module - J623- harness connector T60 / 15 for resistance.
- CHECK: Throttle Valve Control Module - GX3- harness connector terminal 4 to the Engine Control Module - J623- harness connector T60 / 13 for resistance.
- CHECK: Throttle Valve Control Module - GX3- harness connector terminal 5 to the Engine Control Module - J623- harness connector T60 / 30 for resistance.
- SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω).
-- Were Values obtained? |
-- YES:
- REPLACE: Throttle Valve Control Module - GX3-. Refer to appropriate repair information.
- GO TO: Step 7
-- 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 7
|
| 6 |
- REMOVE: Engine Control Module - J623-. Refer to appropriate repair information.
- CHECK: Throttle Valve Control Module - GX3- harness connector terminal 2 to the Engine Control Module - J623- harness connector T60 / 14 for resistance.
- CHECK: Throttle Valve Control Module - GX3- harness connector terminal 6 to the Engine Control Module - J623- harness connector T60 / 29 for resistance.
- SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω).
-- 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 7
|
| 7 |
- 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.
- 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.
- If all electrical connections are OK:
- REPLACE: Engine Control Module -J623-. Refer to appropriate repair information.
- 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.
|