Electronic Control System Diagnosis; Precautions In Diagnosing Troubles - Suzuki Ignis Service Manual

7B-24 AUTOMATIC TRANSMISSION (4 A/T)
ELECTRONIC CONTROL SYSTEM DIAGNO-
SIS
TCM has on-board diagnostic system (a system self-diagnosis
function). Investigate where the trouble is by referring to "DIAG-
NOSTIC FLOW TABLE" and "DTC TABLE" in this section.

PRECAUTIONS IN DIAGNOSING TROUBLES

[PRECAUTIONS IN IDENTIFYING DTC]
• For vehicle equipped with immobilizer indicator lamp (2)
(which comes on when turning on ignition switch leaving
engine OFF), malfunction indicator lamp (MIL) (1) comes on
when TCM detects malfunction of automatic transmission
system.
• For vehicle equipped without immobilizer indicator lamp (2),
malfunction indicator lamp (MIL) (1) does not come on
although TCM detects malfunction of automatic transmission
system.
• Don't disconnect couplers from TCM, battery cable from bat-
tery, TCM ground wire harness from engine or main fuse
before checking DTC stored in TCM memory.
Such disconnection will clear memorized information in TCM
memory.
• Using SUZUKI scan tool (Tech-1) (4), diagnostic trouble
code (DTC) stored in TCM memory can be checked and
cleared as well.
Before its use, be sure to read Operator's (instruction) Man-
ual supplied with it carefully to have good understanding of
its functions and usage.
• Not using scan tool, the DTC stored in TCM memory also
can be checked and cleared.
DTC stored in the TCM memory is outputted by flashing of
"O/D OFF" lamp (3) with diagnosis switch terminal of monitor
connector No.2 (5) grounded.
If no DTC is stored in TCM memory, DTC No.12 is outputted
repeatedly.
If one or more DTCs are stored in TCM memory, they are
outputted starting from smallest code number in increasing
order.
After all DTCs are outputted, all DTCs are outputted repeat-
edly.
• Be sure to read "PRECAUTIONS FOR ELECTRICAL CIR-
CUIT SERVICE" in Section 0A before inspection and
observe what is written there.
• When replacing TCM with used one, all learned contents
which are stored in TCM memory should be erased after the
replacement referring to "LEARNING CONTROL INITIAL-
IZATION" in this section.