Throttle Valve Control Module -J338-, Checking
WARNING: This page is about a different variant/trim than selected.
Function
Throttle valve operation occurs by an electric motor identified as EPC Throttle Drive -G186- located within the Throttle Valve Control Module - J338-. It is controlled by the Engine Control Module - J623- with primary inputs from the Accelerator Pedal Position Sensor -G79- / Accelerator Pedal Position Sensor 2 -G185- 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 -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 -J338- components cannot be serviced separately, it 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
Test Procedure
| 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 |
- 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? |
|
| 3 |
- Condition may be intermittent
- PERFORM: Visual Inspection of wiring and component
- CHECK: wiring for open, high resistance, short or electrical connector for damage, corrosion, loose or broken terminals
- REPAIR: faulty wiring or connector
|
|
| 4 |
- REMOVE: Throttle Valve Control Module -J338 - far enough so that the electrical connector terminals are accessible.
- DISCONNECT: Throttle Valve Control Module -J338- electrical connector
- IGNITION: ON
- CHECK: Throttle Valve Control Module -J338- wiring connector pins 2 to 6 for voltage
- CHECK: Throttle Valve Control Module -J338- wiring connector pin 2 to Ground for voltage
- SPECIFIED VALUE: About 5.0 V
- IGNITION: OFF
-- Was value obtained? |
|
| 5 |
- REMOVE: Engine Control Module - J623-. Refer to appropriate service information.
- CHECK: Throttle Valve Control Module -J338- electrical connector terminal 1 to the Engine Control Module - J623- electrical connector T60 / 27.
- CHECK: Throttle Valve Control Module -J338- electrical connector terminal 4 to the Engine Control Module - J623- electrical connector T60 / 12.
- CHECK: Throttle Valve Control Module -J338- electrical connector terminal 3 to the Engine Control Module - J623- electrical connector T60 / 15.
- CHECK: Throttle Valve Control Module -J338- electrical connector terminal 5 to the Engine Control Module - J623- electrical connector T60 / 30.
- SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω)
-- Was value obtained? |
|
| 6 |
- REMOVE: Engine Control Module - J623-. Refer to appropriate service information.
- CHECK: Throttle Valve Control Module -J338- electrical connector terminal 2 to the Engine Control Module - J623- electrical connector T60 / 28.
- CHECK: Throttle Valve Control Module -J338- electrical connector terminal 6 to the Engine Control Module - J623- electrical connector T60 / 29.
- SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω)
-- Was value obtained? |
|
| 7 |
- Final Procedure
- Perform a road test to verify repair.
- Do any DTC's return:
|
- NO:
- Repair is complete, Generate readiness code. Refer to READINESS CODE
.
- Return vehicle to Customer
|