Suzuki Grand Vitara JB627. Manual - part 16

1A-13 Engine General Information and Diagnosis: 

Electronic Control System Description

S6JB0B1101010

The electronic control system consists of various sensors which detect the state of engine and driving conditions, ECM 
which controls various devices according to the signals from the sensors and various controlled devices.
Functionally, it is divided into the following sub systems:
• Fuel injection control system
• Heated oxygen sensor heater control system (if equipped)
• Idle air control system
• Fuel pump control system
• Evaporative emission control system
• Ignition control system
• EGR system (if equipped)
• IMT valve control system 
• Electric throttle body control system
• Radiator cooling fan control system
• A/F sensor heater control system
• A/C control system (if equipped)
• Immobilizer control system (if equipped)
• Controller communication system
Especially, ECM, BCM, combination meter, TCM (A/T model), ABS control module or ESP

® control module, steering 

angle sensor (ESP

® model), 4WD control module (if equipped) and keyless start control module (if equipped) 

intercommunicate by means of CAN communication.
Refer to “Electronic Control System Location”, “Electronic Control System Diagram” and “Electronic Control System 
Wiring Circuit Diagram”.

Engine and Emission Control Input / Output Table

Function

Output

Input

Main relay control

Main relay

Ignition switch

Fuel pump control

Fuel pump relay

• CKP sensor
• Ignition switch
• Starter switch
• Immobilizer control module (in ECM) (if equipped)

Injection control

Fuel Injectors

• CKP sensor
• CMP sensor
• MAF sensor
• IAT sensor
• TP sensor
• ECT sensor
• A/F sensor
• HO2S (if equipped)
• Barometric pressure sensor
• Ignition switch
• Starter switch
• Immobilizer control module (in ECM) (if equipped)

A/F sensor and HO2S 
heater control (if 
equipped)

A/F sensor and HO2S

• Ignition switch
• MAF sensor
• ECT sensor
• TP sensor
• CKP sensor

Engine General Information and Diagnosis:  1A-14

Idle speed control

Throttle actuator

• CKP sensor
• MAF sensor
• IAT sensor
• TP sensor
• ECT sensor
• APP sensor
• Barometric pressure sensor
• Wheel speed sensor
• A/C refrigerant pressure sensor (if equipped)
• A/C evaporator outlet air temperature sensor (if equipped)
• Ignition switch
• Starter switch
• Brake light switch
• A/C switch (if equipped)
• Blower fan switch
• Rear end door defogger switch
• PSP switch
• Lighting switch
• Transmission range sensor (if equipped)

Ignition control

Ignition coil with igniter

• Ignition switch
• Starter switch
• MAF sensor
• IAT sensor
• ECT sensor
• TP sensor
• CKP sensor
• CMP sensor
• Knock sensor
• Immobilizer control module (in ECM) (if equipped)

EGR control (if equipped) EGR valve

• Ignition switch
• Wheel speed sensor
• MAF sensor
• IAT sensor
• ECT sensor
• TP sensor
• CKP sensor

EVAP purge control

EVAP canister purge valve

• Barometric pressure sensor
• Ignition switch
• A/C switch (if equipped)
• Wheel speed sensor
• A/F sensor
• MAF sensor
• IAT sensor
• ECT sensor
• TP sensor
• CKP sensor

Function

Output

Input

1A-15 Engine General Information and Diagnosis: 

Radiator cooling fan 
control

Radiator cooling fan relay 
No.1, No.2 and No.3

• Ignition switch
• A/C switch (if equipped)
• A/C refrigerant pressure sensor (if equipped)
• A/C evaporator outlet air temperature sensor (if equipped)
• Wheel speed sensor
• ECT sensor

MIL control

MIL

• Ignition switch
• Barometric pressure sensor
• Wheel speed sensor
• A/F sensor
• HO2S (if equipped)
• MAF sensor
• IAT sensor
• TP sensor
• ECT sensor
• APP sensor
• MAP sensor (if equipped)
• CKP sensor
• CMP sensor
• Knock sensor
• EVAP canister purge valve
• Immobilizer control module (in ECM) (if equipped)

ECM main power supply 
control

Main relay

• Ignition switch

Throttle actuator power 
supply control

Throttle actuator control 
relay

• Ignition switch
• TP sensor
• APP sensor

IMT valve control

IMT valve vacuum control 
solenoid valve

• TP sensor
• ECT sensor
• CMP sensor

A/C compressor control 
(if equipped)

A/C compressor relay

• Ignition switch
• Starter switch
• A/C switch
• Blower fan switch
• A/C refrigerant pressure sensor
• A/C evaporator outlet air temperature sensor
• Wheel speed sensor
• ECT sensor
• TP sensor
• CKP sensor

Function

Output

Input

Engine General Information and Diagnosis:  1A-16

Schematic and Routing Diagram

Engine and Emission Control System Diagram

S6JB0B1102001

6

12

42

20

43

27

30

29

28

11

4

3

2

1

33

26

23

25

34

37

24

5

9

13

32

15

8

36

37

7

14

32

16

10

21

22

17

18

19

31

38

41

44

39

40

35

I5JB0C110008-01

1. Air cleaner

16. HO2S (bank-2) (if equipped)

31. Battery

2. MAF and IAT sensor

17. APP sensor

32. Warm-up three way catalytic converter

3. CMP sensor

18. Brake switch

33. EVAP canister

4. CKP sensor

19. Clutch switch (if equipped)

34. EVAP canister purge valve

5. MAP sensor (if equipped)

20. Cruise control switch (if equipped)

35. EGR valve (if equipped)

6. A/C refrigerant pressure sensor

21. Fuel pump with main fuel level sensor

36. Fuel injector

7. ECT sensor

22. Sub fuel level sensor

37. Ignition coil assembly

8. Knock sensor

23. Fuel pressure regulator

38. Transmission range sensor (if equipped)

9. Electric throttle body assembly with TP sensor

24. IMT valve

39. Main relay

10. Three way catalytic converter

25. IMT vacuum solenoid valve

40. Fuel pump relay

11. ECM

26. IMT vacuum tank

41. Starting motor control relay

12. HO2S heater relay

27. Power steering pump pressure switch

42. Radiator cooling fan relay

13. A/F sensor (bank-1)

28. DLC

43. A/C compressor relay (if equipped)

14. A/F sensor (bank-2)

29. ABS or ESP

® control module

44. Ignition switch

15. HO2S (bank-1) (if equipped)

30. To BCM, combination meter, TCM (A/T model), 4WD 

control module (if equipped), keyless start control 
module (if equipped) and steering angle sensor (ESP

® 

model)