Suzuki GRAND VITARA JB416, Service Manual

Page: 320 / 474

5A-1 Automatic Transmission/Transaxle:
Automatic Transmission/Transaxle
Precautions
Precautions in Diagnosing Trouble
S5JB0E5100001
• Do not disconnect couplers from TCM, battery cable
from battery, TCM ground wire harness from engine or
main fuse before checking the diagnostic information
(DTC, freeze frame data, etc.) stored in TCM memory.
Such disconnection will clear memorized information
in TCM memory.
• For vehicle without engine diagnosis connector,
diagnostic information stored in TCM memory can be
cleared as well as checked by using SUZUKI scan
tool or OBD generic scan tool. Before using scan tool,
read its Operator’s (Instruction) Manual carefully to
have good understanding as to what functions are
available and how to use it.
It is indistinguishable which module turns on MIL
because not only ECM but also TCM turns on MIL.
Therefore, check both ECM and TCM for DTC when
MIL lights on.
When checking TCM for DTC, keep in mind that DTC
is displayed on the scan tool as follows depending on
the scan tool used.
– SUZUKI scan tool displays DTC detected by TCM.
– OBD generic scan tool displays DTC detected by
each of ECM and TCM simultaneously.
• For vehicle with engine diagnosis connector, using
SUZUKI scan tool the diagnostic information stored in
TCM memory can be checked and cleared as well.
Before its use, be sure to read Operator’s Manual
supplied with it carefully to have good understanding
of its functions and usage.
• Not using scan tool (if equipped with AT monitor
connector), the DTC stored in TCM memory also can
be checked and cleared. DTC stored in the TCM
memory is outputted by displaying DTC on digital
display odometer with diagnosis terminal of monitor
connector grounded. If no DTC is stored in TCM
memory, DTC 0000 is outputted. 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
repeatedly.
• Be sure to read “Precautions for Electrical Circuit
Service: in Section 00 in related manual” before
inspection and observe what is written there.
• TCM and/or ECM replacement:
When substituting a known-good TCM and/or ECM,
check for the following conditions.
Neglecting this check may result in damage to a good
TCM and/or ECM.
– All relays and actuators have resistance of
specified value.
– MAF sensor, Manifold absolute pressure (MAP)
sensor, TP sensor and fuel tank pressure sensor
are in good condition. Also, the power circuit of
these sensors is not shorted to the ground.
• Communication of ECUs, ECM, TCM, BCM,
combination meter, 4WD control module (if equipped),
ABS/ESP
®
control module, keyless start control
module (if equipped), steering angle sensor (if
equipped) and DLC is established by CAN (controller
Area Network). For more detail of CAN
communication, refer to “CAN Communication
System Description: ”. Therefore, handle CAN
communication line with care referring to “Precaution
for CAN Communication System: in Section 00 in
related manual”.