Jetta L4-1781cc 1.8L SOHC (RV, PF) (1989)
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Engine Control Module: All Technical Service Bulletins
Onboard Diagnosis System - Eliminated
GROUP
90
NUMBER
89-02
July 31, 1989
MODEL(S):
Golf, Jetta - California Vehicles, M.Y. 1988-89
SUBJECT:
Onboard Diagnosis System
Starting with January 1989 production, the Onboard Diagnostic System (OBD) has been eliminated until further notice.
A very limited number of Digifant 11 control units are available for pre-January 1989 production vehicles, to prevent the OBD light from illuminating
intermittently.
The modified OBD control units are identified by a yellow sticker on the outer casing. Contact your Product support specialist for repair information.
This type of ECU also requires a new reset procedure, as follows:
OBD reset procedure
^
switch ignition OFF
^
disconnect (blue) coolant temperature sensor
harness connector
^
press and hold down the OBD rocker switch
^
switch ON ignition
^
continue depressing the rocker switch for at
least 5 seconds
^
switch OFF ignition switch
^
reconnect coolant temperature sensor harness
connector
