Suzuki Grand Vitara JB419. Manual - part 7

Engine General Information and Diagnosis:  1A-5

ECM Transmission Data

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

 

ECM Reception Data

Engine torque signal

Accelerator pedal position

Engine speed

Throttle position 

Engine emissions related 

malfunction

Injection warning light 

(Gravity 1 Fault)

Red Stop Warning Light

(Gravity 2 Fault)

Glow indicator light

Diesel particulate filter warning light

Fuel filter warning light

Engine coolant temperature

Cruise control signal

(if equipped)

Cruise control system

indication (if equipped)

Vehicle speed

Brake pedal switch active

Air conditioning compressor

clutch engaged

(if equipped with A/C)

A/C refrigerant pressure

(if equipped with A/C)

Distance kilometers per 

liter of fuel

Additional heater relay signal

Radiator cooling fan relay signal

BCM

Transmits data

of ECM

4WD control

module

(if equipped)

Combination 

Meter

ESP® control 

module (if equipped)

ABS control

module 

(if equipped)

I5JB0B110004-10

BCM

ESP® control 

module (if equipped)

Air conditioning switch ON

(if equipped with A/C)

Torque up request

Wheel speed pulse (rear right)

Wheel speed pulse (rear left)

Antilock brake system active

Electronic stability program 

system active

ABS control module

(if equipped)

Transmits data of ECM

I5JB0B110005-08

1A-6 Engine General Information and Diagnosis: 

Diesel Particulate Filter Regeneration Description

S5JB0B1101006

As Diesel Particulate Filter is a device to trap the diesel particulate (PM), it is necessary that the accumulated PM is 
burned and diesel particulate filter regenerated.
There are three ways to regenerate diesel particulate filter.
• “Natural regeneration” by catalysis and exhaust gas temperature
• “Forced regeneration” by post-injection
• “After-sales regeneration” by using SUZUKI scan tool
And, here is the mechanism to regenerate diesel particulate filter.
1. Diesel particulate filter, trapping PM, carries out “Natural regeneration” according to the driving condition. The 

driver will not find it.

2. ECM consistently monitors the exhaust gas temperature, injection quantity, driving time, vehicle speed, PM mass 

etc. In case of the long-time idling and traffic jam at low speed that cause lowering the exhaust gas temperature, 
PM is accumulated gradually.
When “Natural regeneration” becomes insufficient (PM mass exceeds 25 g), ECM will perform “Forced 
regeneration” by the post-injection at the point of appropriate driving condition. The post-injection will heat the 
exhaust gas temperature to enable “Forced regeneration”. In this situation, any warning indicator will not come on. 
Therefore, the driver will not recognize that “Forced regeneration” is performed.

3. If “Forced regeneration” is interrupted by the engine stop, long-time idling and traffic jam at low speed that do not 

keep the specified exhaust gas temperature, ECM will memorize it as “Regeneration failure”. When the 
“regeneration failure” number (5 times) or PM mass reach at the specified conditions (PM mass exceeds 42 g), 
ECM will find it as “impossible to regenerate by diesel particulate filter itself and incapable of continuing the 
driving” and ask the driver for a help. This is “Speed request” announced to the driver by diesel particulate filter 
warning light (1) in combination meter. Then, the driver will be asked to increase the vehicle speed more than 75 
km/h (47 MPH) on the average for heating the exhaust gas temperature. If the regeneration is completed by 
“natural regeneration” or “Forced regeneration” when accumulating “regeneration failure”, the accumulation of 
“regeneration failure” will be reset.

4. After the driver fulfills “speed request” for the regeneration and PM mass falls to the specified amount (5 ~ 8 g), the 

regeneration will complete and diesel particulate filter warning light be turned OFF. It will take about 20 minutes to 
complete the regeneration if the regeneration driving is performed properly. During the regeneration driving, 
“Forced regeneration” will go simultaneously to hasten the increase of exhaust gas temperature and shorten the 
time of regeneration. When the engine stops before diesel particulate filter warning light is turned OFF, PM mass 
that should be decreased will be calculated at starting the engine next time. At that time, if PM mass does not fall 
to the specified amount, diesel particulate filter warning light will come on again and the vehicle continue to ask the 
driver for regeneration driving.

5. If the regeneration driving is not achieved and diesel particulate filter becomes almost clogged while “Speed 

request” is on, injection warning light (Gravity 1 Fault) (2) in combination meter will come on. Also, to prevent 
diesel particulate filter from melting and cracking, ECM will take following actions;

1) EGR (Exhaust Gas Recirculation) will be cut off to avoid generating the extra PM.
2) “Forced regeneration” function will stop.
3) Driving performance will be limited by lowering the engine torque to avoid “Natural regeneration”.

Therefore, the driver will recognize the malfunction of diesel particulate filter.
In this situation, “After-sales regeneration” using SUZUKI scan tool will be necessary or diesel particulate filter has to 
be replaced in the worst case.

2

1

I5JB0B110016-01

Engine General Information and Diagnosis:  1A-7

Schematic and Routing Diagram

Electronic Control System Diagram

S5JB0B1102001

23

2

9

10

11

12

13

14

16

15

4

3

5

6

7

17

8

20

21

22

23

18

36

37

38

39

40

41

55

42 

43

44

45

46

47

48

49

50

33

51

54

52

53

19

24

25

26

27

28

29

30

31

32

33

34

35

1

56

I5JB0B110006-04

1. ECM

20. Boost pressure control solenoid valve

39. 4WD control module

1A-8 Engine General Information and Diagnosis: 

2. Exhaust gas temperature sensor 3

21. Common rail (High pressure fuel injection 

rail)

40. Immobilizer control module

3. Diesel particulate filter

22. Fuel pressure sensor

41. BCM

4. Exhaust gas temperature sensor 2

23. Fuel injector

42. Electric load

5. Oxidation catalytic converter

24. Vacuum pump

43. A/C refrigerant pressure sensor (if equipped with 

A/C)

6. Turbocharger

25. CMP sensor

44. Cruise control switch (if equipped with cruise 

control system)

7. Boost pressure control valve actuator

26. Glow plug

45. Radiator fan motor relay

8. Exhaust gas temperature sensor 1

27. ECT sensor

46. Additional heater

9. Differential pressure sensor

28. CKP sensor

47. Turbocharger electric water pump

10. Fuel flow actuator

29. EGR valve

48. A/C compressor magnet clutch

11. Injection pump

30. Boost pressure sensor

49. Data link connector

12. Fuel filter

31. Inlet throttle valve

50. Brake lamp

13. Fuel heater

32. Glow plug control module

51. Ignition switch

14. Fuel filter water detection sensor

33. Clutch pedal position (CPP) switch

52. Main relay

15. Priming pump

34. Brake lamp switch

53. Fuel heater relay

16. Fuel pump 

35. Accelerator pedal position (APP) sensor

54. Battery

17. MAF sensor assembly with IAT sensor

36. Wheel speed sensor (VSS signal)

55. Barometric pressure sensor

18. Air cleaner

37. ABS or ESP

® control module

56. EGR cooler

19. Intercooler

38. Combination meter