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Bentley Volkswagen.Golf.Jetta.R32.Official.Factory.Repair.Manual.1999-2005

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Measured value (data) blocks<br />

Página 7 de 86<br />

01-188<br />

Evaluating display group 1, display zone 1 - Engine speed (idle speed)<br />

VAG 1551<br />

display<br />

Less than<br />

specified<br />

Greater than<br />

specified<br />

Possible cause<br />

Throttle Valve Control Module -<br />

J338- sticking/faulty<br />

Large amount of unmetered air<br />

(cannot be compensated for by the<br />

idling stabilization)<br />

Idle speed not detected<br />

Large amount of unmetered air<br />

(cannot be compensated for by the<br />

idling stabilization)<br />

Throttle Valve Control Module -<br />

J338- sticking/faulty<br />

Supply voltage too low, engine tries<br />

to reduce charge difference through<br />

increased idle speed<br />

Corrective action<br />

- Check Throttle Valve<br />

Control Module -J338-<br />

Page 24-59<br />

- Check intake air system for<br />

leaks Page 24-121<br />

- Perform idle speed check<br />

Page 24-125<br />

- Check DTC memory<br />

Page 01-23 , DTC memory,<br />

checking and erasing<br />

- Check intake air system for<br />

leaks Page 24-121<br />

- Check Throttle Valve<br />

Control Module -J338-<br />

Page 24-59<br />

- Perform idle speed check<br />

Page 24-125<br />

- Evaluation Page 01-<br />

194 , display group 4, display<br />

zone 2<br />

http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Next&type=repair&id=...<br />

12/2/<strong>2005</strong>

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