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-, Will Not Adapt (GROUP 24, NO. 04-01)
Reference number: GROUP 24, NO. 04-01
THROTTLE VALVE CONTROL MODULE -J338-, WILL NOT ADAPT
TECHNICAL SERVICE BULLETIN
| AUDI: | A4 1.8T (Eng. code AEB, ATW, AWM), 1997-2001 |
| GROUP: | 24 - Multiport Fuel Injection |
SUBJECT
Throttle Valve Control Module -J338-, Will Not Adapt
CONDITION
When performing the Throttle Valve Control Module -J338- adaptation procedure, the procedure aborts.
DTC's which may be associated with condition:
| DTC | Description |
|---|---|
| P1559 | Throttle position adaptation malfunction |
| P1565 | Throttle position lower limit not attained |
May be caused by contaminants (dirt, oil, carbon) accumulated over long period of time on interior surfaces of Throttle Valve Control Module -J338- and around the edges of throttle plate.
SERVICE
Whenever the Throttle Valve Control Module -J338- must be re-adapted, if the adaptation procedure aborts before completion or ends with described DTC stored in ECM DTC memory, DO NOT replace Throttle Valve Control Module -J338-:
- Remove intake boot from Throttle Valve Control Module -J338-.
- Inspect interior surface of Throttle Valve Control Module -J338- and throttle plate for dirt / oil film.
If interior of Throttle Valve Control Module -J338- is not dirty:
- Reinstall intake boot.
- Continue with diagnosis, (see appropriate Repair Manual group or VAS 5051 Guided Fault Finding).
If interior of Throttle Valve Control Module -J338- is dirty / oily:
- Clean interior surfaces of Throttle Valve Control Module -J338- (on both sides of throttle plate) with a soft clean cloth (see below).
DO NOT replace Throttle Valve Control Module -J338- for this condition.
Over a long period of time it is possible that dirt can accumulate on the inner surfaces.
THROTTLE VALVE CONTROL MODULE -J338-, CLEANING INSTRUCTIONS
It is not necessary to remove the Throttle Valve Control Module -J338- to clean.
- For heavier deposits of dirt / oil film, apply Wynn's(tm)X-Trend V.I.C. Combustion Chamber Cleaner: Part No: 61510 (U.S.), Part No: 61512 (CAN) on a soft clean cloth then, clean interior surfaces using this cloth (one can of cleaner will do many vehicles, therefore it is considered shop supply)CAUTION: Always read and follow Manufacturers Cautions and Warnings regarding the use of the product.
- Reinstall intake boot.
- Perform Throttle Valve Control Module -J338- adaptation (see Repair group 24 of appropriate Repair Manual).
After cleaning Throttle Valve Control Module -J338-:
If after several attempts the adaptation procedure is still unsuccessful (see AESIS for more details on proper adaptation conditions), then proceed with further diagnosis of the Throttle Valve Control Module -J338-.
WARRANTY INFORMATION
| When procedure applies to vehicles within the New Vehicle Limited Warranty, use the following: | |
| Part Identifier: | 2434 |
| Labor Operation: For cleaning only | 24349999 (use A-time) Maximum A-Time allowed 10 TU |
NO RELATED
Use the Manual With the Right Hardware
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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.