Greater Than - Volkswagen Golf 1999 Service Manual

Measured value (data) blocks
Evaluating display group 1, display zone 1 - Engine speed (idle speed)
VAG 1551
display
Less than
specified

Greater than

specified
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Possible cause
Throttle Valve Control Module -
J338- sticking/faulty
Large amount of unmetered air
(cannot be compensated for by the
idling stabilization)
Idle speed not detected
Large amount of unmetered air
(cannot be compensated for by the
idling stabilization)
Throttle Valve Control Module -
J338- sticking/faulty
Supply voltage too low, engine tries
to reduce charge difference through
increased idle speed
Página 7 de 86
Corrective action
- Check Throttle Valve
Control Module -J338-
Page 24-59
- Check intake air system for
leaks Page 24-121
- Perform idle speed check
Page 24-125
- Check DTC memory
Page 01-23 , DTC memory,
checking and erasing
- Check intake air system for
leaks Page 24-121
- Check Throttle Valve
Control Module -J338-
Page 24-59
- Perform idle speed check
Page 24-125
- Evaluation Page 01-
194 , display group 4, display
zone 2
01-188
12/2/2005