Infiniti M45 (Y34). Manual - part 378

DTC P0122, P0123 TP SENSOR

EC-201

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Wiring Diagram

ABS002FZ

TBWA0282E

EC-202

DTC P0122, P0123 TP SENSOR

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

ABS002G0

1. 

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

2.

Loosen and retighten two ground screws. 
Refer to 

EC-141, "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)

89

B

Sensor ground

[Engine is running]

●

Warm-up condition

●

Idle speed

Approximately 0V

98

w

Throttle position sensor 2

[Ignition switch: ON]

●

Engine stopped

●

Selector lever: D

●

Accelerator pedal: Fully released

Less than 4.75V

[Ignition switch: ON]

●

Engine stopped

●

Selector lever: D

●

Accelerator pedal: Fully depressed

More than 0.36V

103

L

Sensor power supply

[Ignition switch: ON]

Approximately 5V

108

B/W

Throttle position sensor 1

[Ignition switch: ON]

●

Engine stopped

●

Selector lever: D

●

Accelerator pedal: Fully released

More than 0.36V

[Ignition switch: ON]

●

Engine stopped

●

Selector lever: D

●

Accelerator pedal: Fully depressed

Less than 4.75V

PBIB1118E

DTC P0122, P0123 TP SENSOR

EC-203

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2. 

CHECK THROTTLE POSITION SENSOR 2 POWER SUPPLY CIRCUIT

1.

Disconnect electric throttle control actuator harness connector.

2.

Turn ignition switch: ON.

3.

Check voltage between electric throttle control actuator terminal
1 and ground with CONSULT-II or tester.

OK or NG

OK

>> GO TO 3.

NG

>> Repair open circuit or short to ground or short to power

in harness or connectors.

3. 

CHECK THROTTLE POSITION SENSOR 2 GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch: OFF.

2.

Disconnect ECM harness connector.

3.

Check harness continuity between electric throttle control actuator terminal 5 and ECM terminal 89.
Refer to Wiring Diagram.

4.

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

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 4.

4. 

DETECT MALFUNCTIONING PART

Check the following.

●

Joint connector-30

●

Harness for open or short between electric throttle control actuator and ECM

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

5. 

CHECK THROTTLE POSITION SENSOR 2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Check harness continuity between ECM terminal 98 and electric throttle control actuator terminal 2.
Refer to Wiring Diagram.

2.

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

OK or NG

OK

>> GO TO 6.

NG

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

PBIB0015E

Voltage: Approximately 5V

PBIB0082E

Continuity should exist.

Continuity should exist.

EC-204

DTC P0122, P0123 TP SENSOR

6. 

CHECK THROTTLE POSITION SENSOR

Refer to 

EC-204, "Component Inspection"

 .

OK or NG

OK

>> GO TO 8.

NG

>> GO TO 7.

7. 

REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR

1.

Replace the electric throttle control actuator.

2.

Perform 

EC-44, "Accelerator Pedal Released Position Learning"

 .

3.

Perform 

EC-44, "Throttle Valve Closed Position Learning"

 .

4.

Perform 

EC-44, "Idle Air Volume Learning"

 .

>> INSPECTION END

8. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Component Inspection

ABS002G1

THROTTLE POSITION SENSOR

1.

Reconnect all harness connectors disconnected.

2.

Perform 

EC-44, "Accelerator Pedal Released Position Learning"

 .

3.

Perform 

EC-44, "Throttle Valve Closed Position Learning"

 .

4.

Turn ignition switch ON.

5.

Set selector lever to D position. 

6.

Check voltage between ECM terminals 108 (TP sensor 1signal),
98 (TP sensor 2signal) and ground under the following condi-
tions.

7.

If NG, replace electric throttle control actuator and go to the next
step.

8.

Perform 

EC-44, "Accelerator Pedal Released Position Learning"

 .

9.

Perform 

EC-44, "Throttle Valve Closed Position Learning"

 .

10. Perform 

EC-44, "Idle Air Volume Learning"

 .

Removal and Installation

ABS002G2

ELECTRIC THROTTLE CONTROL ACTUATOR

Refer to 

EM-18, "INTAKE MANIFOLD"

 .

Terminal

Accelerator pedal

Voltage

108
(Throttle position sensor 1)

Fully released

More than 0.36V

Fully depressed

Less than 4.75V

98
 (Throttle position sensor 2)

Fully released

Less than 4.75V

Fully depressed

More than 0.36V

PBIB0179E