Infiniti Q45. Manual - part 504

DTC P2127, P2128 APP SENSOR

EC-655

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DTC Confirmation Procedure

NBS00268

NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10V at idle.

 WITH CONSULT-II

1.

Turn ignition switch ON.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

Start engine and let it idle for 1 second.

4.

If DTC is detected, go to 

EC-657, "Diagnostic Procedure"

 .

 WITH GST

Follow the procedure “WITH CONSULT-II” above.

SEF058Y

EC-656

DTC P2127, P2128 APP SENSOR

Wiring Diagram

NBS00269

TBWM1251E

DTC P2127, P2128 APP SENSOR

EC-657

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EC

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

NBS0026A

1. 

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

2.

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

EC-154, "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

L/W

Sensor power supply 
(Throttle position sensor)

[Ignition switch: ON]

Approximately 5V

82

L

Sensor ground
(APP sensor 1)

[Engine is running]

●

Warm-up condition

●

Idle speed

Approximately 0V

83

L

Sensor ground
(APP sensor 2)

[Engine is running]

●

Warm-up condition

●

Idle speed

Approximately 0V

90

R

Sensor power supply
(APP sensor 1)

[Ignition switch: ON]

Approximately 5V

91

B

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

0.15 - 0.60V

[Ignition switch: ON]

●

Engine stopped

●

Accelerator pedal: Fully depressed

1.95 - 2.40V

106

W

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

PBIB2417E

EC-658

DTC P2127, P2128 APP SENSOR

2. 

CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT-I

1.

Disconnect accelerator pedal position (APP) sensor 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 8.

NG

>> GO TO 3.

3. 

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 5.

NG

>> GO TO 4.

4. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors M135, F105

●

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

>> Repair or replace open circuit.

5. 

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 6.

NG

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

PBIB2432E

Voltage: Approximately 5V

PBIB0915E

Continuity should exist.

ECM terminal

Sensor terminal

Reference Wiring Diagram

91

APP sensor terminal 4

EC-656

47

Electric throttle control actuator terminal 1

EC-663