Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Throttle Valve Control Module -J338-, CHECKING: Notes
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 | Checking wiring |
| If the specified value was obtained: | Check reference signal circuit | Checking wiring |
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.