Suzuki Grand Vitara JB416 / JB420 / JB419. Manual — part 15

1A-7 Engine General Information and Diagnosis: For Petrol Engine Model

Data Link Connector (DLC)
DLC (1) is in compliance with SAE J1962 in the shape of
connector and pin assignment.
OBD serial data line (3) (K line of ISO 9141) is used for
SUZUKI scan tool or OBD generic scan tool to
communicate with ECM, Air bag SDM, immobilizer
control module (in ECM), BCM (Body electrical Control
Module), TCM (Transmission Control Module (for A/T
model)), 4WD control module (if equipped) and ABS /
ESP

® control module.

Engine and Emission Control System Description

S6JB0A1111004

The engine and emission control system is divided into 4 major sub-systems: air intake system, fuel delivery system,
electronic control system and emission control system.
Air intake system includes air cleaner, throttle body, and intake manifold.
Fuel delivery system includes fuel pump, delivery pipe, etc.
Electronic control system includes ECM, various sensors and controlled devices.
Emission control system includes EGR, EVAP and PCV system.

CAN Communication System Description

S6JB0A1111005

ECM (1), ABS / ESP

® control module (2), TCM (A/T model) (3), BCM (4), 4WD control module (if equipped) (5),

combination meter (6), keyless start control module (if equipped) (7) and steering angle sensor (ESP

® model) (8) of

this vehicle communicate control data between each control module.
Communication of each control module is established by CAN (Controller Area Network) communication system.

2. B + (Unswitched vehicle battery positive)
4. ECM ground (Signal ground)
5. Vehicle body ground (Chassis ground)

2

3

4

5

1

9

10

11

12

13

14

15

16

1

2

3

4

5

6

7

8

1

I5JB0A110004-01

1

3

4

5

7

8

2

6

I6JB01110110-02

Engine General Information and Diagnosis: For Petrol Engine Model 1A-8

CAN communication system uses the serial communication in which data is transmitted at a high speed. It uses a
twisted pair of two communication lines for the high-speed data transmission. As one of its characteristics, multiple
control modules can communicate simultaneously. In addition, it has a function to detect a communication error
automatically. Each module reads necessary data from the received data and transmits data. ECM communicates
control data with each control module as follows.

ECM Transmission Data

NOTE
In communication between ECM and combination meter, between ECM and keyless start control
module (if equipped) and between ECM and 4WD control module, data is transmitted only from ECM to
those control module. (Combination meter, keyless start control module and 4WD control module
does not transmit data to ECM.)

Engine torque signal

Accelerator position

Engine speed signal

Throttle position

Stand by to engage A/C

compressor

4th gear inhibit

Torque converter clutch

control inhibit

Lock up / slip control

inhibit signal

Immobiliz
light control signal

er indicator

MIL control signal

Engine coolant

temperature signal

Fuel level signal

Cruise control signal

(if equipped)

"CRUSE" and "SET" indicator
light control signal

Vehicle speed signal

Brake pedal switch

signal

A/C compressor clutch

(A/C model)

A/C refr
signal

igerant pressure

Diagnostic trouble code (DTC)

(if equipped with diagnosis

connector)

TCM
(A/T

model)

BCM

4WD control

module

(4WD model)

Combination

meter

Keyless start

control module

(keyless start

model)

Transmit data of ECM

ABS

control module

(Non-ESP model)

R

ESP

control module

(ESP model)

R

R

Fuel consumption signal

I6JB0A111004-02

1A-9 Engine General Information and Diagnosis: For Petrol Engine Model

ECM Reception Data

TCM

(for A/T model)

BCM

Torque reduction request

Slip control signal

Transmission malfunction

indication on

Transmission emissions related

malfunction active

Transmission gear selector

position

DRL ON signal

(if equipped with DRL)

A/C switch ON signal

(if equipped with A/C)

A/T mode status signal

Electric load active

Blower fan signal

Torque up request

Wheel speed pulse (rear right)

Wheel speed pulse (rear left)

ABS system active

ABS control module

assmbly (Non-ESP

model)

Receives data of ECM

ESP

control module

(ESP model)

R

R

R

ESP® status signal

I6JB0A111005-02

Engine General Information and Diagnosis: For Petrol Engine Model 1A-10

Air Intake System Description

S6JB0A1111006

The main components of the air intake system are air cleaner (1), air cleaner outlet hose (2), electric throttle body (3)
(for the details, refer to “Electric Throttle Body System Description: For Petrol Engine Model”.), intake manifold tuning
(IMT) valve (4) which adjusts the distributor pipe length of intake manifold to (A) or (B) (for J20 engine) (for the details,
refer to “IMT (Intake Manifold Tuning) System Description: For J20 Engine in Section 1D”.) and intake manifold (5).
The air (by the amount corresponding to throttle valve (6) opening and engine speed) is filtered by the air cleaner,
distributed by the intake, and finally drawn into each combustion chamber.Electric throttle body is not equipped with
IAC valve for idle speed control. Idle speed control is done by the throttle actuator (7) which opens/closes the throttle
valve. (For the details, refer to “Electric Throttle Body System Description: For Petrol Engine Model”)

2

3

6

7

5

4

1

5

2

1

3

6

7

A

B

[B]

[A]

I5JB0A110008-02

[A]: For J20 engine
[B]: For M16 engine