Throttle Valve Control Module -J338-, CHECKING
Observe all safety precautions: SAFETY PRECAUTIONS
View clean working conditions: CLEAN WORKING CONDITIONS
Use only gold-plated terminals when servicing any component with gold-plated electrical harness connector terminals.
For wiring diagrams, component locations, and connector views, Refer to the applicable wiring diagram.
Special tools and workshop equipment required
- Multimeter
- Wiring diagram
Test requirements
- The fuses OK
- The battery voltage at least 12.5 V
- All electrical consumers switched off
- A/C switched off
- The ignition switched off
- Vehicles with automatic transmission, shift selector lever in park or neutral
- Ground connections between engine/transmission/chassis OK
- Throttle valve must not be damaged or dirty
Test procedure
-- Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK
Start diagnosis
-- Connect the scan tool.
-- Switch ignition on.
-- Using the scan tool, check the throttle valve position (absolute) at idle stop:
| Diagnostic text | Specified value | |||
|---|---|---|---|---|
| Throttle valve position (absolute) | ||||
|
3.0 to 25.0% | |||
-- Slowly depress the accelerator pedal to Wide Open Throttle (WOT) stop while observing the percentage display. The percentage display must increase uniformly.
-- Using the scan tool, check the throttle valve position (absolute) at Wide Open Throttle (WOT) stop:
| Diagnostic text | Specified value | |||
|---|---|---|---|---|
| Throttle valve position (absolute) | ||||
|
84.0 to 97.0% | |||
-- Switch ignition off.
If specified values are obtained:
-- Fault may be intermittent.
-- Check for loose or corroded connections and any leaks in the Intake system.
-- Check Freeze Frame data for conditions when the DTC set.
-- Go to Final procedures
If the specified values are not obtained:
-- Remove the throttle valve control module far enough so that the electrical connector can be reached.
-- Disconnect the Throttle Valve Control Module -J338- electrical connector.
-- Using a Multimeter, Check the Throttle Valve Control Module -J338- electrical harness connector terminal 1 to 2 to for voltage.
Specified value: Battery Voltage
-- Switch the ignition OFF.
-- Continue test according to the following table:
| Value | Cause | Test |
|---|---|---|
| If the specified value was not obtained: | Open or shorted circuit | Throttle Valve Control Module -J338-, CHECKING => Checking wiring |
| If the specified value was obtained: | Check reference signal circuit | Throttle Valve Control Module -J338-, CHECKING => Checking wiring |
Checking wiring
-- Using a Multimeter, Check the Throttle Valve Control Module -J338- electrical harness connector for an open circuit.
| Throttle Valve Control Module -J338- electrical harness connector terminals | Measure To: |
|---|---|
| 1 | Ground connection in engine compartment, left |
| 2 | Fuse, (Refer to applicable wiring diagram for fuse positions). |
Specified value: 1.5 Ω Max.
If the specified value was Not obtained:
-- Check the wiring connection for an open or short circuit.
-- Check the wiring connection for damage, corrosion, loose or broken terminals.
-- If necessary, repair the faulty wiring connection and replace any open fuses
-- Go to Final procedures
If the specified value was obtained:
-- If no faults were found Replace the Throttle Valve Control Module -J338-. Refer to appropriate service information.
-- Go to Final procedures
Checking wiring
-- Remove the Motronic Engine Control Module (ECM) - J623 -. Refer to appropriate service information.
-- Using a Multimeter, Check the Throttle Valve Control Module -J338- electrical harness connector to the Engine Control Module (ECM) - J623 - electrical harness connector T60 for an open circuit.
| Throttle Valve Control Module -J338- electrical harness connector terminals | Engine Control Module (ECM) - J623 - electrical harness connector T60 terminals |
|---|---|
| 3 | 30 |
| 4 | 11 |
Specified value: 1.5 Ω Max.
If the specified value was Not obtained:
-- Check the wiring connection for an open circuit, short circuit to Battery positive or Ground
-- Check the wiring connection for damage, corrosion, loose or broken terminals.
-- If necessary, repair the faulty wiring connection.
-- Go to Final procedures
If the specified value was obtained:
-- Replace the Engine Control Module (ECM) - J623 -. Refer to appropriate service information.
Final procedures
After repair work, the following work steps must be performed in the following sequence:
- Check the DTC memory. Refer to DIAGNOSTIC MODE 03 - READ DTC MEMORY .
- If necessary, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
- If the DTC memory was erased, generate readiness code. Refer to READINESS CODE .