A/T Diagnosis General Description; On-Board Diagnostic System Description (A/T) - Suzuki Liana RH418 Supplementary Service Manual

5A-6 Automatic Transmission/Transaxle:

A/T Diagnosis General Description

This vehicle is equipped with an electronic transaxle
control system, which controls the automatic shift up and
shift down timing, TCC operation, etc. suitably to vehicle
driving conditions.
TCM has an On-Board Diagnosis System which detects
a malfunction in this system and abnormality of those
parts that influence the engine exhaust emission.
When diagnosing a trouble in transaxle including this
system, be sure to have full understanding of the outline
of "On-Board Diagnostic System Description" and each
item in "Precautions in Diagnosing Trouble" and execute
diagnosis according to "A/T System Check" to obtain
correct result smoothly.
On-Board Diagnostic System Description
For automatic transaxle control system, TCM has
following functions.
• When ignition switch is turned ON with O/D off switch
turned OFF and no malfunction in A/T control system
is detected, "O/D OFF" lamp (1) lights for about 2
seconds after ignition switch is turned ON and then
goes OFF for bulb check. If O/D off switch is ON at
this time, however, "O/D OFF" lamp remains ON to let
driver known that gear is not shifted to overdrive gear.
• When TCM detects a malfunction in A/T control
system, it flashes "O/D OFF" lamp (1) and stores
malfunction DTC in its memory.
• It is possible to communicate with TCM through data
link connector (DLC) (2) by using SUZUKI scan tool
(3). Diagnostic information can be checked and
erased by using scan tool.
• It is also possible to check DTC stored in TCM
memory by displaying DTC on digital display
odometer (5). DTC is displayed on odometer by
connecting diagnosis switch terminal (7) with ground
terminal (8) of blue monitor connector (6) while reset
button (4) is pressed. If no malfunction DTC is stored
in TCM memory, DTC No.12 is displayed. If one or
more DTCs are stored in TCM memory, they are
displayed 3 seconds each sequentially. After all DTCs
are displayed, they are displayed in the same manner
as above repeatedly.
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