Volkswagen Passat 1995 Official Factory Repair Manual page 2884

On Board Diagnostic (OBD) program
VAG 1551 print-out
00638
Engine/trans.
electrical
connection 2
No signal
00641
Transmission fluid
temperature
Signal too
large
http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Goto&type=repair&id=VW.B4.AT02.01.2
Possible cause of malfunction
Open circuit or short to Ground (GND)
No connection between Engine Control
Module (ECM) and Transmission Control
Module (TCM)
Transmission becomes too hot, max.
148 C (298 F). If ATF temperature is too
high, transmission shifts down into next
lower gear.
Trailer load of vehicle too high
ATF level not correct
Repairing malfunction
- Check wiring and connections
according to wiring diagram
- Read measured value block
page 01-40 ; display group number
05
- Check Engine Control Module,
replace if necessary
Repair Manual, Fuel Injection &
Ignition, Repair Group 01 for
relevant engine code
- Bring system to basic settings
page 01-39
- Check ATF level
- Read measured value block
page 01-40 ; display group number
05; read transmission fluid
temperature
Page 15 of 43
01-34
page 37-43
12/6/2004