Nissan Xterra. Manual

EC-6

P1550 BATTERY CURRENT SENSOR ..........

383

Component Description .........................................

383

On Board Diagnosis Logic .....................................

383

DTC Confirmation Procedure ................................

383

Diagnosis Procedure .............................................

383

Component Inspection ...........................................

385

P1551, P1552 BATTERY CURRENT SEN-
SOR ..................................................................

386

Component Description .........................................

386

On Board Diagnosis Logic .....................................

386

DTC Confirmation Procedure ................................

386

Diagnosis Procedure .............................................

386

Component Inspection ...........................................

388

P1553 BATTERY CURRENT SENSOR ..........

389

Component Description .........................................

389

On Board Diagnosis Logic .....................................

389

DTC Confirmation Procedure ................................

389

Diagnosis Procedure .............................................

389

Component Inspection ...........................................

391

P1554 BATTERY CURRENT SENSOR ..........

392

Component Description .........................................

392

On Board Diagnosis Logic .....................................

392

Overall Function Check .........................................

392

Diagnosis Procedure .............................................

392

Component Inspection ...........................................

394

P1564 ASCD STEERING SWITCH .................

395

Component Description .........................................

395

On Board Diagnosis Logic .....................................

395

DTC Confirmation Procedure ................................

395

Diagnosis Procedure .............................................

395

Component Inspection ...........................................

397

P1572 BRAKE PEDAL POSITION SWITCH ...

398

Component Description .........................................

398

On Board Diagnosis Logic .....................................

398

DTC Confirmation Procedure ................................

398

Diagnosis Procedure .............................................

399

Component Inspection ...........................................

404

P1574 ASCD VEHICLE SPEED SENSOR ......

406

Component Description .........................................

406

On Board Diagnosis Logic .....................................

406

DTC Confirmation Procedure ................................

406

Diagnosis Procedure .............................................

406

P1715 INPUT SPEED SENSOR ......................

408

Description .............................................................

408

On Board Diagnosis Logic .....................................

408

Diagnosis Procedure .............................................

408

P1800 VIAS CONTROL SOLENOID VALVE 1 .

409

Component Description .........................................

409

On Board Diagnosis Logic .....................................

409

DTC Confirmation Procedure ................................

409

Diagnosis Procedure .............................................

409

Component Inspection ...........................................

410

P1805 BRAKE SWITCH ...................................

412

Description ............................................................

412

On Board Diagnosis Logic ....................................

412

DTC Confirmation Procedure ................................

412

Diagnosis Procedure .............................................

412

Component Inspection ..........................................

413

P2004 INTAKE MANIFOLD RUNNER CON-
TROL VALVE ...................................................

414

DTC Logic .............................................................

414

Diagnosis Procedure .............................................

414

Component Inspection ..........................................

415

P2014, P2016, P2017, P2018 INTAKE MANI-
FOLD RUNNER CONTROL VALVE POSI-
TION SENSOR .................................................

417

DTC Logic .............................................................

417

Diagnosis Procedure .............................................

417

P2096, P2097, P2098, P2099 A/F SENSOR 1 ..

420

Component Description ........................................

420

On Board Diagnosis Logic ....................................

420

DTC Confirmation Procedure ................................

420

Diagnosis Procedure .............................................

421

P2100, P2103 THROTTLE CONTROL MO-
TOR RELAY .....................................................

426

Component Description ........................................

426

On Board Diagnosis Logic ....................................

426

DTC Confirmation Procedure ................................

426

Diagnosis Procedure .............................................

426

P2101 ELECTRIC THROTTLE CONTROL
FUNCTION ........................................................

429

Description ............................................................

429

On Board Diagnosis Logic ....................................

429

DTC Confirmation Procedure ................................

429

Diagnosis Procedure .............................................

429

Component Inspection ..........................................

432

P2118 THROTTLE CONTROL MOTOR ..........

433

Component Description ........................................

433

On Board Diagnosis Logic ....................................

433

DTC Confirmation Procedure ................................

433

Diagnosis Procedure .............................................

433

Component Inspection ..........................................

434

P2119 ELECTRIC THROTTLE CONTROL
ACTUATOR ......................................................

435

Component Description ........................................

435

On Board Diagnosis Logic ....................................

435

DTC Confirmation Procedure ................................

435

Diagnosis Procedure .............................................

436

P2122, P2123 APP SENSOR ...........................

437

Component Description ........................................

437

On Board Diagnosis Logic ....................................

437

DTC Confirmation Procedure ................................

437

Diagnosis Procedure .............................................

438

Component Inspection ..........................................

439

EC-8

< PRECAUTION >

[VQ40DE]

PRECAUTIONS

PRECAUTION

PRECAUTIONS

Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"

INFOID:0000000009483764

The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along

with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain

types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS

system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front

air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.

Information necessary to service the system safely is included in the SR and SB section of this Service Man-

ual.

WARNING:

• To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in

the event of a collision which would result in air bag inflation, all maintenance must be performed by

an authorized NISSAN/INFINITI dealer.

• Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal

injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag

Module, see the SR section.

• Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this

Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or har-

ness connectors.

PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS

WARNING:

• When working near the Airbag Diagnosis Sensor Unit or other Airbag System sensors with the Igni-

tion ON or engine running, DO NOT use air or electric power tools or strike near the sensor(s) with a

hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly causing

serious injury.

• When using air or electric power tools or hammers, always switch the Ignition OFF, disconnect the

battery and wait at least three minutes before performing any service.

Precaution for Procedure without Cowl Top Cover

INFOID:0000000009483765

When performing the procedure after removing cowl top cover, cover

the lower end of windshield with urethane, etc to prevent damage to

windshield.

On Board Diagnosis (OBD) System of Engine and A/T

INFOID:0000000009483766

The ECM has an on board diagnostic system. It will light up the malfunction indicator lamp (MIL) to warn the

driver of a malfunction causing emission deterioration.

CAUTION:

• Always turn the ignition switch OFF and disconnect the negative battery cable before any repair or

inspection work. The open/short circuit of related switches, sensors, solenoid valves, etc. will cause

the MIL to light up.

• Always connect and lock the connectors securely after work. A loose (unlocked) connector will

cause the MIL to light up due to the open circuit. (Be sure the connector is free from water, grease,

dirt, bent terminals, etc.)

• Certain systems and components, especially those related to OBD, may use a new style slide-lock-

ing type harness connector. For description and how to disconnect, refer to

PG-63, "Description"

PIIB3706J

PRECAUTIONS

EC-9

< PRECAUTION >

[VQ40DE]

• Always route and secure the harnesses properly after work. The interference of the harness with a

bracket, etc. may cause the MIL to light up due to the short circuit.

• Always connect rubber tubes properly after work. A misconnected or disconnected rubber tube may

cause the MIL to light up due to the malfunction of the EVAP system or fuel injection system, etc.

• Always erase the unnecessary malfunction information (repairs completed) from the ECM and TCM

(Transmission control module) before returning the vehicle to the customer.

Precaution

INFOID:0000000009483767

• Always use a 12 volt battery as power source.

• Never attempt to disconnect battery cables while engine is

running.

• Before connecting or disconnecting the ECM harness con-

nector, turn ignition switch OFF and disconnect negative bat-

tery cable. Failure to do so may damage the ECM because

battery voltage is applied to ECM even if ignition switch is

turned OFF.

• Before removing parts, turn ignition switch OFF and then dis-

connect negative battery cable.

• Never disassemble ECM.

• If a battery cable is disconnected, the memory will return to

the ECM value.

The ECM will now start to self-control at its initial value.

Engine operation can vary slightly when the terminal is dis-

connected. However, this is not an indication of a malfunc-

tion. Never replace parts because of a slight variation.

• If the battery is disconnected, the following emission-related

diagnostic information will be lost within 24 hours.

- Diagnostic trouble codes

- 1st trip diagnostic trouble codes

- Freeze frame data

- 1st trip freeze frame data

- System readiness test (SRT) codes

- Test values

- <Flexible Fuel Vehicle>

Presumed ethanol mixture ratio

• When connecting ECM harness connector, refer to

PG-63, "Description"

• When connecting or disconnecting pin connectors into or

from ECM, never damage pin terminals (bends or break).

Make sure that there are not any bends or breaks on ECM pin

terminal, when connecting pin connectors.

• Securely connect ECM harness connectors.

A poor connection can cause an extremely high (surge) volt-

age to develop in coil and condenser, thus resulting in dam-

age to ICs.

• Keep engine control system harness at least 10 cm (4 in) away

from adjacent harness, to prevent engine control system mal-

functions due to receiving external noise, degraded operation

of ICs, etc.

• Keep engine control system parts and harness dry.

SEF289H

PBIA9222J

PBIB0090E

Nissan Xterra. Manual - part 220