Suzuki Grand Vitara JB627. Manual — part 206

5A-8 Automatic Transmission/Transaxle:

CAN Communication System Description

S6JB0B5101004

Refer to “CAN Communication System Description in Section 1A” for CAN communication System description.
TCM communicates control data with each control module as follows.

TCM Transmission Data

TCM Reception Data

Transmission output speed

Transmission malfunction indication ON

Transmission emissions related malfunction

Transmission gear selector position

Transmission actual gear

Transmission oil temperarure

ECM

Combination

meter

Transmit data of TCM

Reception unit

BCM

4WD control

module

(if equipped)

ESP

control module

(if equipped)

R

*1

*2

*1

*2

I6JB0B510001-02

*1: Non-E-OBD model
*2: E-OBD model

ECM

Reception data of TCM

Transmission unit

BCM

Engine torque actual

Accelerator actual position

Engine speed

Throttle position

Air conditioning compressor clutch engaged

Engine coolant temperature

Cruise control signal

Brake pedal switch active

AT mode status

I6JB0B510002-01

Automatic Transmission/Transaxle: 5A-9

Electronic Shift Control Input / Output Table

S6JB0B5101005

Brake Interlock System Description

S6JB0B5101006

Shift Lock Solenoid Control
This system consists of shift lock solenoid control system and interlock cable control system.
The shift lock solenoid control system is so designed that the select lever can not be shifted from “P” range position
unless the ignition switch is turned ON and the brake pedal is depressed. And the interlock cable control system is so
designed that the ignition key cannot be pulled out of the key slot unless the select lever is in “P” range.

INPUT / OUTPUT

CONTROL

Accelerator pedal position

Throttle position

Coolant temperature

Engine torque

Engine speed

A/C ON/OFF

Brake light switch

Vehicle speed

Cruise control signal

"4" position switch

Input shaft speed sensor

ATF temperature sensor A

Output shaft speed sensor

Transfer 4L/N switch

P/N mode switch

Torque reduction request

Transmission range sensor

Lock-up control

Gear Shift control

5th gear inhibit control

Shift timing control

Slope shift control

Cruise shift control

Line pressre control

Torque control

Overrun control

Reverse control

Squat control

Speed meter indication

Output

Input

Shift solenoid valve-A

Shift solenoid valve-B

Pressure control solenoid valve-A

TCC pressure control solenoid valve

Shift solenoid valve-E

Pressure control solenoid valve-B

Pressure control solenoid valve-C

I5JB0C510004-02

5A-10 Automatic Transmission/Transaxle:

A/T Diagnosis General Description

S6JB0B5101007

This vehicle is equipped with an electronic transmission
control system, which control 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 the transmission 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.

NOTE
There are two type of On-Board Diagnostic
System, E-OBD system and non-E-OBD
system, depending on vehicle specifications.
E-OBD model is equipped with HO2S-2 (1) on
exhaust No.1 pipe (2). Identify the type of
system for vehicle being serviced by whether
the vehicle equipped with HO2S-2 (1) on
exhaust No.1 pipe (2) or not.

On-Board Diagnostic System Description

S6JB0B5101008

For E-OBD model
For automatic transmission control system, TCM has the
following functions. Refer to “Inspection of TCM and Its
Circuits”.
• When the ignition switch is turned ON with the engine

at a stop, malfunction indicator lamp (MIL) (1) turns
ON to check the bulb of the MIL.

• When TCM detects a malfunction in A/T control

system (and/or a malfunction which gives an adverse
effect to vehicle emission) while the engine is running,
TCM requires ECM to make the malfunction indicator
lamp in the meter cluster of the instrument panel turn
ON. TCM stores the malfunction area (DTC according
to SAE J2012) in TCM memory.
(If it detects that continuously 3 driving cycles are
normal after detecting a malfunction, however, it
makes MIL turn OFF although DTC stored in its
memory will remain.)

• It is possible to communicate through DLC (3) by

using not only SUZUKI scan tool (2) but also OBD
generic scan tool which are in compliance with
SAEJ1978. (Diagnostic information can be accessed
by using a scan tool.)

1

2

I6JB0B510012-01

1

2

3

I5JB0A510011-01

Automatic Transmission/Transaxle: 5A-11

For Non-E-OBD model
For automatic transmission control system, TCM has the
following functions. Refer to “Inspection of TCM and Its
Circuits”.
• When ignition switch is turned ON with no malfunction

in A/T control system is detected, transmission
warning light (1) lights for about 2 seconds after
ignition switch is turned ON and then goes OFF for
bulb check.

• When TCM detects a malfunction in A/T control

system, it indicates transmission warning light (1) and
stores malfunction DTC in its memory.

• It is possible to communicate with TCM through data

link connector (DLC) (3) by using SUZUKI scan tool
(2). Diagnostic information can be checked and
erased by using SUZUKI scan tool.

2 Driving Cycle Detection Logic
The malfunction detected in the first driving cycle is
stored in TCM memory (in the form of pending DTC and
freeze frame data) but the malfunction indicator lamp
does not light at this time. It lights up at the second
detection of same malfunction also in the next driving
cycle.

Pending DTC
Pending DTC means a DTC detected and stored
temporarily at 1 driving cycle of the DTC which is
detected in the 2 driving cycle detection logic.

Freeze Frame Data
TCM stores the engine and driving conditions at the
moment of the detection of a malfunction in its memory.
This data is called “Freeze frame data”.
Therefore, it is possible to know engine and driving
conditions (e.g., whether the engine was warm or not,
where the vehicle was running or stopped) when a
malfunction was detected by checking the freeze frame
data.

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I6JB0B510013-01