Nissan Xterra. Manual - part 331

EC-450

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P2138 APP SENSOR

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

6.

CHECK THROTTLE POSITION SENSOR

Refer to 

EC-264, "Component Inspection"

.

OK or NG

OK

>> GO TO 12.

NG

>> GO TO 7.

7.

REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR

1. Replace electric throttle control actuator. Refer to 

EM-25, "Exploded View"

.

2. Perform 

EC-125, "Throttle Valve Closed Position Learning"

.

3. Perform 

EC-125, "Idle Air Volume Learning"

.

>> INSPECTION END

8.

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 terminals 4 and ECM terminal 100, APP sensor terminal 5

and ECM terminal 116.

Refer to Wiring Diagram.

4. Also check harness for short to ground and short to power.
OK or NG

OK

>> GO TO 9.

NG

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

9.

CHECK APP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Check harness continuity between ECM terminal 97 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 10.

NG

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

10.

CHECK APP SENSOR

Refer to 

EC-451, "Component Inspection"

.

OK or NG

OK

>> GO TO 12.

NG

>> GO TO 11.

11.

REPLACE ACCELERATOR PEDAL ASSEMBLY

1. Replace accelerator pedal assembly. Refer to 

ACC-3, "Component"

.

ECM terminal

Sensor terminal

103

APP sensor terminal 1

24

Electric throttle control actuator terminal 2

Continuity should exist.

Continuity should exist.

P2138 APP SENSOR

EC-451

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2. Perform 

EC-125, "Accelerator Pedal Released Position Learning"

.

3. Perform 

EC-125, "Throttle Valve Closed Position Learning"

.

4. Perform 

EC-125, "Idle Air Volume Learning"

.

>> INSPECTION END

12.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000009484208

ACCELERATOR PEDAL POSITION SENSOR

1. Reconnect all harness connectors disconnected.
2. Turn ignition switch ON.
3. Check voltage between ECM terminals 97 (APP sensor 1 signal), 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-125, "Accelerator Pedal Released Position Learning"

.

6. Perform 

EC-125, "Throttle Valve Closed Position Learning"

.

7. Perform 

EC-125, "Idle Air Volume Learning"

.

Terminal

Accelerator pedal

Voltage

97
 (Accelerator pedal position 
sensor 1)

Fully released

0.65 - 0.87V

Fully depressed

More than 4.3V

98
(Accelerator pedal position 
sensor 2)

Fully released

0.28 - 0.48V

Fully depressed

More than 2.0V

EC-452

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BRAKE PEDAL POSITION SWITCH

BRAKE PEDAL POSITION SWITCH

Component Description

INFOID:0000000009484209

When the brake pedal is depressed, brake pedal position switch is turned OFF and stop lamp switch is turned

ON. ECM detects the state of the brake pedal by two types of input (ON/OFF signal).

Refer to 

EC-28, "System Description"

 for the ASCD function.

Diagnosis Procedure

INFOID:0000000009484210

A/T MODELS

1.

CHECK OVERALL FUNCTION-I

 With CONSULT

1. Turn ignition switch ON.

2. Select “BRAKE SW1” in “DATA MONITOR” mode with CONSULT.

3. Check “BRAKE SW1” indication under the following conditions.

 Without CONSULT

1. Turn ignition switch ON.

2. Check voltage between ECM terminal 126 and ground under the following conditions.

OK or NG

OK

>> GO TO 2.

NG

>> GO TO 3.

2.

CHECK OVERALL FUNCTION-II

 With CONSULT

Check “BRAKE SW2” indication in “DATA MONITOR” mode. 

 Without CONSULT

Check voltage between ECM terminal 122 and ground under the following conditions.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 7.

3.

CHECK BRAKE PEDAL POSITION SWITCH POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

CONDITION

INDICATION

Brake pedal: Slightly depressed

OFF

Brake pedal: Fully released

ON

CONDITION

VOLTAGE

Brake pedal: Slightly depressed

Approximately 0V

Brake pedal: Fully released

Battery voltage

CONDITION

INDICATION

Brake pedal: Fully released

OFF

Brake pedal: Slightly depressed

ON

CONDITION

VOLTAGE

Brake pedal: Fully released

Approximately 0V

Brake pedal: Slightly depressed

Battery voltage

BRAKE PEDAL POSITION SWITCH

EC-453

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2. Disconnect brake pedal position switch (1) harness connector.

-

Stop lamp switch (2)

3. Turn ignition switch ON.

4. Check voltage between brake pedal position switch terminal 1

and ground with CONSULT or tester.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 4.

4.

DETECT MALFUNCTIONING PART

Check the following.

• Fuse block (J/B) connector E160

• 10 A fuse (No.12)

• Harness for open or short between brake pedal position switch and fuse

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

5.

CHECK BRAKE PEDAL POSITION SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check harness continuity between ECM terminal 126 and brake pedal position switch terminal 2.

Refer to Wiring Diagram.

4. 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.

6.

CHECK BRAKE PEDAL POSITION SWITCH

Refer to 

EC-457, "Component Inspection"

. 

OK or NG

OK

>> GO TO 11.

NG

>> Replace brake pedal position switch. Refer to 

BR-19, "Exploded View"

.

7.

CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect stop lamp switch (2) harness connector.

-

brake pedal position switch (1)

3. Check voltage between stop lamp switch terminal 1 and ground

with CONSULT or tester.

OK or NG

OK

>> GO TO 9.

NG

>> GO TO 8.

8.

DETECT MALFUNCTIONING PART

Check the following.

• Fuse block (J/B) connector E160

• 10 A fuse (No.20)

• Harness for open or short between stop lamp switch and battery

Voltage: Battery voltage

MBIB1214E

Continuity should exist.

Voltage: Battery voltage

MBIB1214E