Nissan Pathfinder. Manual

EC-6

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

372

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

372

Component Function Check ..................................

372

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

373

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

373

P1556, P1557 BATTERY TEMPERATURE
SENSOR ..........................................................

375

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

375

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

375

Component Inspection (Battery Temperature
Sensor) ..................................................................

376

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

377

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

377

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

377

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

379

P1572 ASCD BRAKE SWITCH .......................

380

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

380

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

380

Component Function Check ..................................

381

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

382

Component Inspection (Brake Pedal Position
Switch) ...................................................................

384

Component Inspection (Stop Lamp Switch) ..........

384

P1574 ASCD VEHICLE SPEED SENSOR ......

386

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

386

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

386

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

386

P1700 CVT CONTROL SYSTEM ....................

388

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

388

P1715 INPUT SPEED SENSOR (PRIMARY
SPEED SENSOR) ............................................

389

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

389

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

389

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

389

P1800 VIAS CONTROL SOLENOID VALVE 1 .

390

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

390

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

390

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

391

P1801 VIAS CONTROL SOLENOID VALVE 2 .

392

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

392

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

392

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

393

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

394

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

394

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

394

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

394

Component Inspection (Stop Lamp Switch) ..........

395

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

396

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

396

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

396

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

400

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

400

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

400

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

402

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

402

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

402

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

404

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

405

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

405

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

405

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

406

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

407

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

407

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

407

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

409

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

409

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

409

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

410

P2127, P2128 APP SENSOR ...........................

411

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

411

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

411

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

412

P2135 TP SENSOR ..........................................

414

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

414

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

414

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

415

P2138 APP SENSOR .......................................

416

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

416

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

416

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

418

ASCD INDICATOR ...........................................

419

Component Function Check .................................

419

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

419

BRAKE PEDAL POSITION SWITCH ...............

420

Component Function Check .................................

420

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

420

Component Inspection (Brake Pedal Position
Switch) ..................................................................

421

COOLING FAN .................................................

422

Component Function Check .................................

422

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

422

Component Inspection (Cooling Fan Motor) .........

424

Component Inspection (Cooling Fan Relay) .........

424

ELECTRICAL LOAD SIGNAL ..........................

425

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

425

Component Function Check .................................

425

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

425

EC-8

< PRECAUTION >

[VQ35DE]

PRECAUTIONS

PRECAUTION

PRECAUTIONS

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

INFOID:0000000009760867

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. Information necessary to service the system safely is included in the SR and SB section of

this Service Manual.

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.

On Board Diagnostic (OBD) System of Engine and CVT

INFOID:0000000009177998

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

driver of a malfunction causing emission deterioration.

CAUTION:

• Always to 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 illuminate.

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

cause the MIL to illuminate 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-5, "Harness Connec-

tor"

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

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

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

may cause the MIL to illuminate due to the malfunction of the EVAP system or fuel injection system,

etc.

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

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

PRECAUTIONS

EC-9

< PRECAUTION >

[VQ35DE]

General Precautions

INFOID:0000000009177999

• 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 battery ground 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. Thus, engine operation can vary slightly in

this case. However, this is not an indication of a malfunction. 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

• When connecting or disconnecting pin connectors into or

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

Check that there are not any bends or breaks on ECM pin ter-

minal, 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.

• Before replacing ECM, perform ECM Terminals and Reference

Value inspection and check ECM functions properly. Refer to

EC-73, "Reference Value"

• Handle mass air flow sensor carefully to avoid damage.

• Never clean mass air flow sensor with any type of detergent.

• Never disassemble electric throttle control actuator.

• Even a slight leakage in the air intake system can cause seri-

ous incidents.

• Never shock or jar the camshaft position sensor (PHASE),

crankshaft position sensor (POS).

SEF289H

PBIB0090E

MEF040D

Nissan Pathfinder. Manual - part 425