Suzuki Grand Vitara JB627. Manual - part 51

1A-153 Engine General Information and Diagnosis: 

DTC Troubleshooting

NOTE
Before this trouble shooting is performed, read the precautions for DTC troubleshooting referring to 
“Precautions for DTC Troubleshooting”.

 

DTC P2122 / P2123: Pedal Position Sensor (Main) Circuit Low / High

S6JB0B1104063

Wiring Diagram

DTC Detecting Condition and Trouble Area

Step

Action

Yes

No

1

Was “Engine and Emission Control System Check” 
performed?

Go to Step 2.

Go to “Engine and 
Emission Control 
System Check”.

2

Electric throttle body assembly check
1) Check electric throttle body for operation and condition 

referring to “Electric Throttle Body Assembly On-Vehicle 
Inspection in Section 1C”.

Is it in good condition?

Substitute a known 
good ECM and recheck.

Repair or replace 
electric throttle body 
assembly.

1

3 2

4

5

6

7

8

9

1110

12

13

14

15

16

17

18

19

20

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

33

34

35

36

37

38

39

40

32

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

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

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

81

E23

C37

E23-26

E23-27

5 V

WHT/BLU

ORN

1

2

5

4

3

5 V

E23-25

WHT

E23-33

E23-34

E23-35

ORN/BLU

BLU/GRN

BLU/YEL

P

S

G

P1

S1

G1

I6JB01110059-02

P: APP sensor (main) power supply circuit

S1: APP sensor (sub) signal circuit

3: APP sensor (sub)

S: APP sensor (main) signal circuit

G1: APP sensor (sub) ground circuit

4: ECM

G: APP sensor (main) ground circuit

1: APP sensor assembly

5: Ground of APP sensor for shield wire

P1: APP sensor (sub) power supply circuit

2: APP sensor (main)

DTC detecting condition

Trouble area

DTC P2122: Pedal Position Sensor (Main) Circuit Low
Output voltage of pedal position sensor (main) is less than 0.45 V.
(1 driving cycle detection logic)

• APP sensor and its circuit
• ECM

DTC P2123: Pedal Position Sensor (Main) Circuit High
Output voltage of pedal position sensor (main) is more than 4.8 V.
(1 driving cycle detection logic)

Engine General Information and Diagnosis:  1A-154

DTC Confirmation Procedure

1) With ignition switch turned OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC by using scan tool if any.
3) Keep the accelerator pedal at idle position for 2 seconds.
4) Keep the accelerator pedal at fully depressed position for 2 seconds.
5) Repeat Step 3) and 4) for 3 times.
6) Check DTC by using scan tool.

DTC Troubleshooting

NOTE
Before this trouble shooting is performed, read the precautions for DTC troubleshooting referring to 
“Precautions on Engine Service”.

 

Step

Action

Yes

No

1

Was “Engine and Emission Control System Check” 
performed?

Go to Step 2.

Go to “Engine and 
Emission Control 
System Check”.

2

Accelerator pedal position (APP) sensor assembly 
mounting check
1) Check that APP sensor assembly has been mounted to 

vehicle body properly (no pinched floor carpet, etc.).

Is it in good condition?

Go to Step 3.

Reinstall accelerator 
pedal position (APP) 
sensor assembly 
properly referring to 
“Accelerator Pedal 
Position (APP) Sensor 
Assembly Removal and 
Installation in Section 
1C”.

3

APP sensor (main) and its circuit check
1) Connect scan tool to DLC with ignition switch turned 

OFF.

2) Turn ON ignition switch, check “APP Sensor 1 Volt” 

displayed on scan tool when accelerator pedal is idle 
position and fully depressed.

Is displayed APP sensor value as described voltage in “Scan 
Tool Data”?

Intermittent trouble. 
Check for intermittent 
referring to “Intermittent 
and Poor Connection 
Inspection in Section 
00”.

Go to Step 4.

1A-155 Engine General Information and Diagnosis: 

DTC P2127 / P2128: Pedal Position Sensor (Sub) Circuit Low / High

S6JB0B1104064

Wiring Diagram
Refer to “DTC P2122 / P2123: Pedal Position Sensor (Main) Circuit Low / High”.

DTC Detecting Condition and Trouble Area

DTC Confirmation Procedure

1) With ignition switch turned OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC by using scan tool if any.
3) Keep the accelerator pedal at idle position for 2 seconds.
4) Keep the accelerator pedal at fully depressed position for 2 seconds.
5) Repeat Step 3) and 4) for 3 times.
6) Check DTC by using scan tool.

4

Wire harness check
1) Turn ignition switch OFF position.
2) Disconnect connectors from APP sensor and ECM.
3) Check for proper terminal connection to APP sensor and 

ECM connectors.

4) If connections are OK, check that APP sensor (main) 

circuit is as follows.
• Wiring harness resistance of each APP sensor (main) 

power supply, signal and ground circuit is less than 3 

Ω

• Insulation resistance of each APP sensor (main) 

power supply and signal circuit is infinity between 
APP sensor connector and vehicle body ground.

• Insulation resistance of wire harness is infinity 

between APP sensor (main) power supply terminal 
and each other terminal at APP sensor connector.

• Circuit voltage of each APP sensor (main) power 

supply, signal and ground circuit is 0 – 1 V with 
ignition switch turned ON

Are they in good condition?

Go to Step 5.

Repair or replace APP 
sensor (main) power 
supply, signal and/or 
ground circuit(s).

5

APP sensor power supply voltage check
1) Connect connectors to ECM.
2) Turn ignition switch ON position.
3) Check that circuit voltage is 5 V between APP sensor 

(main) power supply terminal and vehicle body ground.

Is it in good condition?

Go to Step 5.

Substitute a known 
good ECM and recheck.

6

APP sensor check
1) Check APP sensor for performance referring to 

“Accelerator Pedal Position (APP) Sensor Assembly 
Removal and Installation in Section 1C”.

Is it in good condition?

Substitute a known 
good ECM and recheck.

Replace APP sensor 
assembly.

Step

Action

Yes

No

DTC detecting condition

Trouble area

DTC P2127: Pedal Position Sensor (Sub) Circuit Low
Output voltage of pedal position sensor (sub) is less than 0.23 V.
(1 driving cycle detection logic)

• APP sensor and its circuit
• ECM

DTC P2128: Pedal Position Sensor (Sub) Circuit High
Output voltage of pedal position sensor (sub) is more than 2.4 V.
(1 driving cycle detection logic)

Engine General Information and Diagnosis:  1A-156

DTC Troubleshooting

NOTE
Before this trouble shooting is performed, read the precautions for DTC troubleshooting referring to 
“Precautions for DTC Troubleshooting”.

 

Step

Action

Yes

No

1

Was “Engine and Emission Control System Check” 
performed?

Go to Step 2.

Go to “Engine and 
Emission Control 
System Check”.

2

APP sensor assembly mounting check
1) Check that APP sensor assembly has been mounted to 

vehicle body properly (no pinched floor carpet, etc.).

Is it in good condition?

Go to Step 3.

Reinstall APP sensor 
assembly properly 
referring to “Accelerator 
Pedal Position (APP) 
Sensor Assembly 
Removal and 
Installation in Section 
1C”.

3

APP sensor (sub) and its circuit check
1) Connect scan tool to DLC with ignition switch turned 

OFF.

2) Turn ON ignition switch, check “APP Sensor 2 Volt” 

displayed on scan tool when accelerator pedal is idle 
position and fully depressed.

Is displayed APP sensor value as described voltage in “Scan 
Tool Data”?

Intermittent trouble.
Check for intermittent 
referring to “Intermittent 
and Poor Connection 
Inspection in Section 
00”.

Go to Step 4.

4

Wire harness check
1) Turn ignition switch OFF position.
2) Disconnect connectors from APP sensor and ECM.
3) Check for proper terminal connection to APP sensor and 

ECM connectors.

4) If connections are OK, check that APP sensor (sub) 

circuit is as follows.
• Wiring harness resistance of each APP sensor (sub) 

power supply, signal and ground circuit is less than 
3

Ω

• Insulation resistance of each APP sensor (sub) power 

supply and signal circuit is infinity between AAP 
sensor connector and vehicle body ground.

• Insulation resistance of wire harness is infinity 

between APP sensor (sub) power supply terminal and 
each other terminal at APP sensor connector.

• Circuit voltage of each APP sensor (sub) power 

supply, signal and ground circuit is 0 – 1 V with 
ignition switch turned ON

Are they in good condition?

Go to Step 5.

Repair or replace APP 
sensor (sub) power 
supply, signal and/or 
ground circuit(s).

5

APP sensor power supply voltage check
1) Connect connectors to ECM.
2) Turn ignition switch ON position.
3) Check that circuit voltage is 5 V between APP sensor 

(sub) power supply terminal and vehicle body ground.

Is it in good condition?

Go to Step 5.

Substitute a known 
good ECM and recheck.