Skoda Octavia Workshop Manual page 92

37
Problem
Noises in final drive
Performance problems (idle
speed jolts)
Engine speed drops when
gear is engaged
Vehicle does not start or in
incorrect selector lever posi-
tion
Selector lever cannot be
shifted out of „N" or „P" when
brake operated; „P" or „N"
are not blocked
Contacts of multifunction
switch -F125 scorched
Insufficient level in planetary
gear, axle oil level too high
(or vice versa) - no external
leaks on gearbox
Oil stains on gearbox only in
area of breathers - no other
external leaks on gearbox
Gearbox shifts down when
driving at constant speed for
no obvious reason
------------ 37-12 ------------
Shift Mechanism/Housing
Possible cause of fault
Taper roller bearings loud
Drive pinion loud
Output gear loud
Input gear loud
Differential loud
Leak at throttle valve connection (some-
times only if engine/gearbox moved)
Engine control unit faulty
Starter lockout and reversing light relay
faulty
Selector lever lock solenoid -N110-
faulty
Control unit -J217- faulty
Multifunction switch faulty
Wiring and plug connection scorched
Wiring and also seals of wiring faulty
Contact corrosion at multifunction
switch
Shaft seal for gearbox faulty, planetary
gear oil filling and axle filling have mixed
Shaft seal for gearbox faulty, planetary
gear oil filling and axle filling have mixed
so that fluids flow out through breather
ATF insufficiently cooled so that gear-
box activates a safety function when
shifting down
Engine speed signal is not detected by
the automatic gearbox control unit
Rectifying fault
- Replace taper roller bearings ⇒ page 39-4
- Replace drive pinion ⇒ page 39-8
- Replace output gear ⇒ page 39-8
- Replace input gear ⇒ page 39-5
- Replace differential ⇒ page 39-14
- Inspect throttle valve connection and air ducts
for leaks
⇒ Workshop Manual Engine; Repair Group 24 of
engine installed (check code letters for assign-
ment); Testing intake system for leaks
(unmetered air)
- Replace engine control unit
⇒ Workshop Manual Engine; Repair Group 24 of
engine installed (check code letters for assign-
ment); Replacing control unit
- Replace relay
⇒ Current Flow Diagrams, Electrical Fault Finding
and Fitting Locations
- Replace selector lever lock solenoid
⇒ page 37-1
- Replace control unit -J217 ⇒ page 01-37
- Replace multifunction switch ⇒ page 38-20
- Replace wiring and plug connections
⇒ Current Flow Diagrams, Electrical Fault Finding
and Fitting Locations
- Check planetary gear oil level ⇒ page 37-22,
check axle oil level ⇒ page 39-1
- Carry out road test and once again check plan-
etary gear oil level and axle oil level
- If fluid level has changed, replace seal of gear-
box and O-ring of bearing supporting ring
⇒ page 39-8
- After repairs, top up fluid levels as per specifica-
tion and capacity ⇒ page 00-4.
- Determine why ATF temperature rises
- Pay attention to additional components or modi-
fication to vehicle which may affect cooling sys-
tem (e.g. towing device without corresponding
modification of radiator fan motor)
- Read measured value block ⇒ page 01-16
OCTAVIA
Edition 01.98
S00.5116.52.20