Infiniti FX35 / FX45. Manual - part 591

DTC P2138 APP SENSOR

EC-1125

< SERVICE INFORMATION >

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Diagnosis Procedure

INFOID:0000000001327029

1.

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

2.

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

EC-723, "Ground Inspection"

.

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace ground connections.

2.

CHECK APP SENSOR 1 POWER SUPPLY CIRCUIT

TER-

MI-

NAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

47

L

Sensor power supply (Throt-
tle position sensor)

[Ignition switch: ON]

Approximately 5V

82

B/W

Sensor ground
(APP sensor 1 / ICC steering 
switch / ASCD steering 
switch)

[Engine is running]
• Warm-up condition
• Idle speed

Approximately 0V

83

G/OR

Sensor ground
(APP sensor 2)

[Engine is running]
• Warm-up condition
• Idle speed

Approximately 0V

90

L/B

Sensor power supply
(APP sensor 1)

[Ignition switch: ON]

Approximately 5V

91

G

Sensor power supply
(APP sensor 2)

[Ignition switch: ON]

Approximately 5V

98

Y/R

Accelerator pedal position 
sensor 2

[Ignition switch: ON]
• Engine stopped
• Accelerator pedal: Fully released

0.15 - 0.60V

[Ignition switch: ON]
• Engine stopped
• Accelerator pedal: Fully depressed

1.95 - 2.40V

106

OR

Accelerator pedal position 
sensor 1

[Ignition switch: ON]
• Engine stopped
• Accelerator pedal: Fully released

0.5 - 1.0V

[Ignition switch: ON]
• Engine stopped
• Accelerator pedal: Fully depressed

3.9 - 4.7V

PBIB2195E

EC-1126

< SERVICE INFORMATION >

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DTC P2138 APP SENSOR

1.

Disconnect accelerator pedal position (APP) sensor harness
connector.

2.

Turn ignition switch ON.

3.

Check voltage between APP sensor terminal 6 and ground with
CONSULT-III or tester.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 3.

3.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors E211, M41
• 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 4 and ground with
CONSULT-III or tester.

OK or NG

OK

>> GO TO 10.

NG

>> GO TO 5.

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 4 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.

PBIB1548E

Voltage: Approximately 5V

PBIB0914E

Voltage: Approximately 5V

PBIB0915E

Continuity should exist.

DTC P2138 APP SENSOR

EC-1127

< SERVICE INFORMATION >

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• Harness connectors E211, M41
• 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-1120, "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-663, "Throttle Valve Closed Position Learning"

.

3.

Perform 

EC-663, "Idle Air Volume Learning"

.

>> INSPECTION END

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 APP sensor terminal 3 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 E211, M41
• 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 ECM terminal 106 and APP sensor terminal 5, ECM terminal 98 and
APP sensor terminal 2.
Refer to Wiring Diagram.

2.

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

ECM terminal

Sensor terminal

Reference Wiring Diagram

91

APP sensor terminal 4

EC-1124

47

Electric throttle control actuator terminal 6

EC-1117

Continuity should exist.

Continuity should exist.

EC-1128

< SERVICE INFORMATION >

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DTC P2138 APP SENSOR

OK or NG

OK

>> GO TO 14.

NG

>> GO TO 13.

13.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors E211, M41
• 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-1128, "Component Inspection"

.

OK or NG

OK

>> GO TO 16.

NG

>> GO TO 15.

15.

REPLACE ACCELERATOR PEDAL ASSEMBLY

1.

Replace accelerator pedal assembly.

2.

Perform 

EC-662, "Accelerator Pedal Released Position Learning"

.

3.

Perform 

EC-663, "Throttle Valve Closed Position Learning"

.

4.

Perform 

EC-663, "Idle Air Volume Learning"

.

>> INSPECTION END

16.

CHECK INTERMITTENT INCIDENT

Refer to 

EC-717

.

>> INSPECTION END

Component Inspection

INFOID:0000000001327030

ACCELERATOR PEDAL POSITION SENSOR

1.

Reconnect all harness connectors disconnected.

2.

Turn ignition switch ON.

3.

Check voltage between ECM terminals 106 (APP sensor 1 sig-
nal), 98 (APP sensor 2 signal) and ground under the following
conditions.

4.

If NG, replace accelerator pedal assembly and go to next step.

5.

Perform 

EC-662, "Accelerator Pedal Released Position Learning"

.

6.

Perform 

EC-663, "Throttle Valve Closed Position Learning"

.

7.

Perform 

EC-663, "Idle Air Volume Learning"

.

Removal and Installation

INFOID:0000000001327031

ACCELERATOR PEDAL

Refer to 

ACC-3

.

Terminal

Accelerator pedal

Voltage

106
 (Accelerator pedal position 
sensor 1)

Fully released

0.5 - 1.0V

Fully depressed

3.9 - 4.7V

98
(Accelerator pedal position 
sensor 2)

Fully released

0.15 - 0.60V

Fully depressed

1.95 - 2.40V

MBIB0023E