Infiniti M35/M45 Y50. Manual - part 542

DTC P2138 APP SENSOR

EC-641

[VQ35DE]

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Specification data are reference values and are measured between each terminal and ground.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

Diagnostic Procedure

NBS0057E

1. 

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

2.

Loosen and retighten two ground screws on the body.
Refer to 

EC-160, "Ground Inspection"

 .

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace ground connections.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

47

G

Sensor power supply 
(Throttle position sensor)

[Ignition switch: ON]

Approximately 5V

82

W

Sensor ground
(APP sensor 1)

[Engine is running]

●

Warm-up condition

●

Idle speed

Approximately 0V

83

P

Sensor ground
(APP sensor 2)

[Engine is running]

●

Warm-up condition

●

Idle speed

Approximately 0V

90

L

Sensor power supply
(APP sensor 1)

[Ignition switch: ON]

Approximately 5V

91

BR

Sensor power supply
(APP sensor 2)

[Ignition switch: ON]

Approximately 5V

98

R

Accelerator pedal position 
sensor 2

[Ignition switch: ON]

●

Engine stopped

●

Accelerator pedal: Fully released

0.20 - 0.55V

[Ignition switch: ON]

●

Engine stopped

●

Accelerator pedal: Fully depressed

1.85 - 2.40V

106

LG

Accelerator pedal position 
sensor 1

[Ignition switch: ON]

●

Engine stopped

●

Accelerator pedal: Fully released

0.4 - 1.1V

[Ignition switch: ON]

●

Engine stopped

●

Accelerator pedal: Fully depressed

3.7 - 4.8V

1.

Body ground M70

2.

Body ground M16

PBIB2782E

EC-642

[VQ35DE]

DTC P2138 APP SENSOR

2. 

CHECK APP SENSOR 1 POWER SUPPLY CIRCUIT

1.

Disconnect accelerator pedal position (APP) sensor (1) harness
connector.

2.

Turn ignition switch ON.

3.

Check voltage between APP sensor terminal 4 and ground with
CONSULT-II or tester.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 3.

3. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors E108, M15

●

Harness for open or short between ECM and accelerator pedal position sensor

>> Repair open circuit or short to ground or short to power in harness or connectors.

4. 

CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-I

1.

Turn ignition switch ON.

2.

Check voltage between APP sensor terminal 5 and ground with
CONSULT-II or tester.

OK or NG

OK

>> GO TO 10.

NG

>> GO TO 5.

PBIB2704E

Voltage: Approximately 5V

PBIA9606J

Voltage: Approximately 5V

PBIA9607J

DTC P2138 APP SENSOR

EC-643

[VQ35DE]

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5. 

CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-II

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check harness continuity between APP sensor terminal 5 and ECM terminal 91.
Refer to Wiring Diagram.

OK or NG

OK

>> GO TO 7.

NG

>> GO TO 6.

6. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors E108, M15

●

Harness for open or short between ECM and accelerator pedal position sensor

>> Repair open circuit.

7. 

CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-III

Check harness for short to power and short to ground, between the following terminals.

OK or NG

OK

>> GO TO 8.

NG

>> Repair short to ground or short to power in harness or connectors.

8. 

CHECK THROTTLE POSITION SENSOR

Refer to 

EC-637, "Component Inspection"

 .

OK or NG

OK

>> GO TO 16.

NG

>> GO TO 9.

9. 

REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR

1.

Replace the electric throttle control actuator.

2.

Perform 

EC-86, "Throttle Valve Closed Position Learning"

 .

3.

Perform 

EC-86, "Idle Air Volume Learning"

 .

>> INSPECTION END

Continuity should exist.

ECM terminal

Sensor terminal

Reference Wiring Diagram

91

APP sensor terminal 5

EC-640

47

Electric throttle control actuator terminal 1

EC-633

EC-644

[VQ35DE]

DTC P2138 APP SENSOR

10. 

CHECK APP SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check harness continuity between the following;
APP sensor terminal 2 and ECM terminal 82,
APP sensor terminal 1 and ECM terminal 83.
Refer to Wiring Diagram.

4.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 12.

NG

>> GO TO 11.

11. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors E108, M15

●

Harness for open or short between ECM and accelerator pedal position sensor

>> Repair open circuit or short to ground or short to power in harness or connectors.

12. 

CHECK APP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Check harness continuity between the following;
ECM terminal 106 and APP sensor terminal 3,
ECM terminal 98 and APP sensor terminal 6.
Refer to Wiring Diagram.

2.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 14.

NG

>> GO TO 13.

13. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors E108, M15

●

Harness for open or short between ECM and accelerator pedal position sensor

>> Repair open circuit or short to ground or short to power in harness or connectors.

14. 

CHECK APP SENSOR

Refer to 

EC-645, "Component Inspection"

 .

OK or NG

OK

>> GO TO 16.

NG

>> GO TO 15.

Continuity should exist.

Continuity should exist.