Suzuki Grand Vitara JB416 / JB420 / JB419. Manual - part 295

4F-28 Electronic Stability Program: 

DTC 1020: Master Cylinder Pressure Sensor Power Supply Failure

S6JB0A4604016

DTC Detecting Condition and Trouble Area

DTC Troubleshooting

1) Turn ignition switch to OFF position.
2) Check for proper connection from harness to ESP

® control module.

3) If OK, substitute an ESP

® hydraulic unit / control module assembly with correct part number.

4) Recheck system.

DTC C1021, C1022 / C1025, C1026 / C1031, C1032 / C1035, C1036: Right-Front / Left-Front / Right-
Rear / Left-Rear Wheel Speed Sensor Circuit or Encoder Failure

S6JB0A4604017

Refer to “DTC C1021, C1022 / C1025, C1026 / C1031, C1032 / C1035, C1036: Right-Front / Left-Front / Right-Rear / 
Left-Rear Wheel Speed Sensor Circuit or Encoder Failure in Section 4E”.

4

Check brake fluid level switch
1) Turn ignition switch to OFF position.
2) Disconnect brake fluid level switch connector.
3) Check for proper connection at each terminal of brake 

fluid level switch connector.

4) If OK, then check brake fluid level switch referring to 

“Brake Fluid Level Switch Inspection in Section 9C”.

Is check result OK?

Go to Step 5.

Replace brake fluid 
level switch.

5

Check brake fluid level switch circuit
1) Disconnect BCM connector.
2) Check for proper connection to BCM connector at “G31-

7” terminal.

3) If OK, then check resistance between “G31-7” terminal 

and vehicle body ground.

Is resistance infinity?

Go to Step 6.

“RED/BLK” wire circuit 
is shorted to ground.

6

Check BCM
1) Connect brake fluid level switch connector and BCM 

connector.

2) Check voltage at “G31-7” terminal of BCM referring to 

“Inspection of BCM and Its Circuits in Section 10B”.

Is voltage in good condition?

Substitute a known-
good ESP

® hydraulic 

unit / control module 
assembly and recheck.

Check BCM power and 
ground circuit. If circuit 
is OK, substitute a 
known-good BCM and 
recheck.

Step

Action

Yes

No

DTC Detecting Condition

Trouble Area

Power supply voltage to master cylinder pressure sensor 
in ESP

® hydraulic unit / control module assembly is too 

low.

• ESP

® control module

Electronic Stability Program:  4F-29

DTC C1024: Steering Angle Sensor Circuit Failure

S6JB0A4604018

DTC Detecting Condition and Trouble Area

DTC Troubleshooting

DTC C1027: ESP

® OFF Switch Circuit Failure

S6JB0A4604019

Wiring Diagram

DTC Detecting Condition and Trouble Area

DTC Detecting Condition

Trouble Area

• Steering angle sensor internal defect is detected by 

CPU in steering angle sensor.

• Steering angle sensor signal is out of specified range.

• Steering angle sensor
• ESP

® control module

Step

Action

Yes

No

1

Was “Electronic Stability Program Check” performed?

Go to Step 2.

Go to “Electronic 
Stability Program 
Check”.

2

DTC check for ESP

®

1) Connect scan tool to DLC with ignition switch turned 

OFF.

2) Turn ignition switch ON and check DTC for ESP

®.

Are DTC C1037, U1073 and/or U1126 detected?

Go to applicable DTC 
diag. flow.

Go to Step 3.

3

Check sensor calibration
1) Calibrate steering angle sensor referring to “Sensor 

Calibration”.

2) Clear all DTC(s) and check DTC for ESP

®.

Is DTC C1024 still detected?

Go to Step 4.

Steering angle sensor 
calibration was 
incompleted.

4

Check steering angle sensor
1) Check steering angle sensor referring to “Steering Angle 

Sensor On-Vehicle Inspection”.

Is it good condition?

Substitute a known-
good ESP

® hydraulic 

unit / control module 
assembly and recheck.

Replace steering angle 
sensor.

[A]

E53

16

1

15

2

3

4

5

6

7

8

9

10

11

12

13

14

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

BLU/WHT

BLK

12V

E53-7

1

2

I6JB01460018-01

[A]: ESP

® control module connector (viewed from terminal side)

1. ESP

® OFF Switch

2. ESP

® hydraulic unit control module assembly

DTC Detecting Condition

Trouble Area

Mechanical switch failure, failure in switch wiring is 
shorted to ground.

• ESP

® OFF switch

• ESP

® OFF switch circuit

• ESP

® control module

4F-30 Electronic Stability Program: 

DTC Troubleshooting

DTC C1028: Master Cylinder Pressure Sensor Circuit Failure

S6JB0A4604020

DTC Detecting Condition and Trouble Area

DTC Troubleshooting

Step

Action

Yes

No

1

Was “Electronic Stability Program Check” performed?

Go to Step 2.

Go to “Electronic 
Stability Program 
Check”.

2

Check ESP

® OFF switch condition

Is ESP

®

 OFF switch is OFF condition?

Go to Step 3.

ESP

® OFF switch 

turned OFF condition 
and recheck.

3

Check ESP

® OFF switch

1) Turn ignition switch to OFF position.
2) Remove ESP

® OFF switch referring to “ESP® OFF 

Switch Removal and Installation”.

3) Check for proper connection at each terminal of ESP

® 

OFF switch.

4) If OK, then check ESP

® OFF switch referring to “ESP® 

OFF Switch Inspection”.

Is it good condition?

Go to Step 4.

Replace ESP

® OFF 

switch.

4

Check ESP

® OFF switch circuit

1) Disconnect ESP

® control module connector.

2) Check for proper connection to ESP

® control module 

connector at “E53-7” terminal.

3) If OK, then check resistance between “E53-7” terminal 

and vehicle body ground.

Is resistance infinity?

Substitute a known-
good ESP

® hydraulic 

unit / control module 
assembly and recheck.

“BLU/WHT” wire circuit 
is shorted to ground.

DTC Detecting Condition

Trouble Area

Input signal voltage from master cylinder pressure sensor 
in ESP

® control module is too high or low.

• Leakage or air in the hydraulic brake system
• Clearance between brake pad and disc too high

Step

Action

Yes

No

1

Was “Electronic Stability Program Check” performed?

Go to Step 2.

Go to “Electronic 
Stability Program 
Check”.

2

Check brake system
1) Check brake system as follows.

• Leakage or air in the hydraulic brake system
• Clearance between brake pad and disc too high

Are they in good condition?

Go to Step 3.

Repair, replace or 
adjust.

3

Check sensor calibration
1) Calibrate master cylinder pressure sensor referring to 

“Sensor Calibration”.

2) Clear all DTC(s) and recheck DTC.

Is DTC C1028 still detected?

Substitute a known-
good ESP

® hydraulic 

unit / control module 
assembly and recheck.

Master cylinder 
pressure sensor 
calibration was 
incompleted.

Electronic Stability Program:  4F-31

DTC C1034: Yaw Rate / G Sensor Assembly Power Supply Failure

S6JB0A4604021

Wiring Diagram

DTC Detecting Condition and Trouble Area

DTC Troubleshooting

[A]

E53

16

1

15

2

3

4

5

6

7

8

9

10

11

12

13

14

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

1

E53-16

E53-47

12V

12V

E53-32

E53-1

E53-35

BLK/YEL

WHT/GRN

WHT/RED

WHT/BLU

E53-29
E53-25

E53-37

E53-31

L39-3

L39-5

BLK

WHT

L39-2
L39-1

12V

PNK/GRN

PNK/WHT

[B]

L39

3

5

2 1

4

6

2

3

5

6

4

7

6

I6JB01460019-03

[A]: ESP

® control module connector (viewed from terminal side)

2. Main fuse box

5. Yaw rate / G sensor assembly

[B]: Yaw rate / G sensor assembly connector (viewed from 

harness side)

3. Ignition switch

6. CAN driver

1. Battery

4. Junction block assembly

7. ESP

® hydraulic unit / control module assembly

DTC Detecting Condition

Trouble Area

• Power supply voltage of yaw rate / G sensor assembly 

is too high when ignition switch OFF.

• Power supply voltage of yaw rate / G sensor assembly 

is too low when ignition switch ON.

• Yaw rate / G sensor assembly power supply circuit
• ESP

® control module power supply circuit

• Yaw rate / G sensor assembly
• ESP

® control module

Step

Action

Yes

No

1

Was “Electronic Stability Program Check” performed?

Go to Step 2.

Go to “Electronic 
Stability Program 
Check”.

2

DTC check for ESP

®

1) Connect scan tool to DLC with ignition switch turned 

OFF.

2) Turn ignition switch ON and check DTC for ESP

®.

Are DTC C1057 and/or C1073 detected?

Go to applicable DTC 
diag. flow.

Go to Step 3.

3

Check yaw rate / G sensor assembly power supply 
circuit
1) Turn ignition switch to OFF position.
2) Disconnect yaw rate / G sensor assembly connector.
3) Check for proper connection to yaw rate / G sensor 

assembly connector terminals at “L39-3” and “L39-5”.

4) If OK, then measure voltage between connector terminal 

“L39-3” and vehicle body ground.

Is it 0 V?

Go to Step 4.

Go to Step 5.