Suzuki Grand Vitara JB416 / JB420. Manual — part 216

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” 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 ABS
hydraulic unit / control module assembly, and keyless
start control module (if equipped), is established by
CAN (controller Area Network). Therefore, handle
CAN communication line with care referring to
“Precaution for CAN Communication System in
Section 00”.

General Service Procedure Information

S5JB0A5100002

When repairing automatic transmission, it is necessary
to conduct the on-vehicle test to investigate where the
cause of the trouble lies first.
Then whether overhaul should be done or not is
determined. If the transmission is disassembled without
such preliminary procedure, not only the cause of the
trouble would be unknown, but also a secondary trouble
may occur and often time would be wasted.

Precautions for Disassembly and Reassembly

S5JB0A5100003

As the automatic transmission consists of high precision
components, the following cautions should be strictly
observed when handling its parts in disassembly and
reassembly.
• Disassembling valve body assembly is prohibited in

principle. However, a few parts can be disassembled.
When disassembling valve body component parts,
confirm whether these parts are allowed to
disassemble or not referring to “Valve Body Assembly
Components”.

• Make sure to wash dirt off from the transmission so

that no such dirt will enter the transmission during
dismounting and remounting.

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Suzuki Grand Vitara JB416 / JB420. Manual — part 216

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