Nissan Pathfinder (2007 year). Manual - part 285

TROUBLE DIAGNOSIS

LAN-11

[CAN FUNDAMENTAL]

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LAN

2007 Pathfinder

Example: CAN-H, CAN-L Harness Short Circuit

SKIB8741E

Unit name

Symptom

ECM

●

Engine torque limiting is affected, and shift harshness increases.

●

Engine speed drops.

BCM

●

Reverse warning chime does not sound.

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The front wiper moves under continuous operation mode even though the front 
wiper switch being in the intermittent position.

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The room lamp does not turn ON.

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The engine does not start (if an error or malfunction occurs while turning the igni-
tion switch is OFF.)

●

The steering lock does not release (if an error or malfunction occurs while turning 
the ignition switch is OFF.)

EPS control unit

The steering effort increases.

Combination meter

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The tachometer and the speedometer do not move.

●

Warning lamps turn ON.

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Indicator lamps do not turn ON.

ABS actuator and electric unit (control unit)

Normal operation.

TCM

No impact on operation.

IPDM E/R

When the ignition switch is ON,

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The headlamps (Lo) turn ON.

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The cooling fan continues to rotate.

LAN-12

[CAN FUNDAMENTAL]

TROUBLE DIAGNOSIS

2007 Pathfinder

Self-Diagnosis

UKS006H9

DTC

Self-diagnosis item

 (CONSULT-II indication)

DTC detection condition

Inspection/Action

U1000

CAN COMM CIRCUIT

When ECM is not transmitting or receiving CAN 
communication signal of OBD (emission-related 
diagnosis) for 2 seconds or more.

Refer to 

LAN-15, 

"TROUBLE DIAG-
NOSES WORK FLOW"

 .

When a control unit (except for ECM) is not 
transmitting or receiving CAN communication 
signal for 2 seconds or more.

U1001

CAN COMM CIRCUIT

When ECM is not transmitting or receiving CAN 
communication signal other than OBD (emis-
sion-related diagnosis) for 2 seconds or more.

U1002

SYSTEM COMM

When a control unit is not transmitting or receiv-
ing CAN communication signal for 2 seconds or 
less.

Start the inspection. 
Refer to the applicable 
section of the indicated 
control unit.

U1010

CONTROL UNIT [CAN]

When an error is detected during the initial diag-
nosis for CAN controller of each control unit.

Replace the control unit 
indicating “U1010”.

TROUBLE DIAGNOSIS

LAN-13

[CAN FUNDAMENTAL]

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LAN

2007 Pathfinder

CAN Diagnostic Support Monitor

UKS006HA

CONSULT-II and CAN diagnostic support monitor (on-board diagnosis function) are used for detecting root
cause.

MONITOR ITEM (CONSULT-II)

Example: CAN DIAG SUPPORT MNTR indication

Without PAST

With PAST

SKIB8742E

Item

PRSNT

Description

Initial diagnosis

OK

Normal at present

NG

Control unit error (Except for some control units)

Transmission diagnosis

OK

Normal at present

UNKWN

Unable to transmit signals for 2 seconds or more.

Diagnosis not performed

Control unit name

(Reception diagnosis)

OK

Normal at present

UNKWN

Unable to receive signals for 2 seconds or more.

Diagnosis not performed

No control unit for receiving signals. (No applicable optional parts)

Item

PRSNT

PAST

Description

Transmission diagnosis

OK

OK

Normal at present and in the past

1 – 39

Normal at present, but unable to transmit signals for 2 seconds or more 
in the past. (The number indicates the number of ignition switch cycles 
from OFF to ON.)

UNKWN

0

Unable to transmit signals for 2 seconds or more at present.

Control unit name

(Reception diagnosis)

OK

OK

Normal at present and in the past

1 – 39

Normal at present, but unable to receive signals for 2 seconds or more 
in the past. (The number indicates the number of ignition switch cycles 
from OFF to ON.)

UNKWN

0

Unable to receive signals for 2 seconds or more at present

–

–

Diagnosis not performed.

No control unit for receiving signals. (No applicable optional parts)

LAN-14

[CAN FUNDAMENTAL]

TROUBLE DIAGNOSIS

2007 Pathfinder

MONITOR ITEM (ON-BOARD DIAGNOSIS)

NOTE:

●

For some models, CAN communication diagnosis result is received from the vehicle monitor. (CONSULT-
II is not available.)

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Refer to 

LAN-48, "MONITOR ITEM LIST (ON-BOARD DIAGNOSIS)"

  for the details.

Example: Vehicle Display 

Item

Result indi-

cated

Error counter

Description

CAN_COMM

(Initial diagnosis)

OK

0

Normal at present

NG

1 – 50

Control unit error
(The number indicates how many times diagnosis has been 
run.)

CAN_CIRC_1

(Transmission diagnosis)

OK

0

Normal at present

UNKWN

1 – 50

Unable to transmit for 2 seconds or more at present.
(The number indicates how many times diagnosis has been 
run.)

CAN_CIRC_2 – 9

(Reception diagnosis of each unit)

OK

0

Normal at present

UNKWN

1 – 50

Unable to transmit for 2 seconds or more at present.
(The number indicates how many times diagnosis has been 
run.)

Diagnosis not performed.

No control unit for receiving signals. (No applicable optional 
parts)

TROUBLE DIAGNOSES WORK FLOW

LAN-15

[CAN FUNDAMENTAL]

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LAN

2007 Pathfinder

TROUBLE DIAGNOSES WORK FLOW

PFP:00004

Information Needed for Trouble Diagnosis

UKS006HB

CAN communication system performs trouble diagnosis with the following tools.

How to Use CAN Communication Signal Chart

UKS006HC

The CAN communication signal chart lists the signals needed for trouble diagnosis. It is useful for detecting
the root cause by finding a signal related to the symptom, and by checking transmission and reception unit.

Tool

Usage

Interview sheet

For filling in vehicle information and interview with customer.

Data sheet

For attaching CONSULT-II data or on-board diagnosis data.

Diagnosis sheet

For detecting the root cause. (Diagnosis sheet includes system diagram for every CAN system 
type)

SELECT SYSTEM
(CONSULT-II)

For checking the condition of control units and the status of CAN communication.

SELF-DIAG RESULTS
(CONSULT-II)

CAN DIAG SUPPORT MNTR
(CONSULT-II)

CAN communication signal 
chart

For converting information received from a customer into CAN communication signal transmission 
and reception. This information can be used to judge whether a circuit between control units is nor-
mal or abnormal.

Abbreviation list

For checking abbreviations in CAN communication signal chart and diagnosis sheet.

SKIB8715E

LAN-16

[CAN FUNDAMENTAL]

TROUBLE DIAGNOSES WORK FLOW

2007 Pathfinder

Trouble Diagnosis Flow Chart

UKS006HD

SKIB8716E

TROUBLE DIAGNOSES WORK FLOW

LAN-17

[CAN FUNDAMENTAL]

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LAN

2007 Pathfinder

Trouble Diagnosis Procedure

UKS006HE

INTERVIEW WITH CUSTOMER

Interview with the customer is important to detect the root cause of CAN communication system errors and to
understand vehicle condition and symptoms for proper trouble diagnosis.

Points in interview

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What: Parts name, system name

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When: Date, Frequency

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Where: Road condition, Place

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In what condition: Driving condition/environment

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Result: Symptom

NOTE:

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Check normal units as well as error symptoms.

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Example: Circuit between ECM and the combination meter is judged normal if the customer indicates
tachometer functions normally.

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When a CAN communication system error is present, multiple control units may malfunction or go into fail-
safe mode.

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Indication of the combination meter is important to detect the root cause because it is the most obvious
from the customer, and it performs CAN communication with many units.

SKIB8717E

LAN-18

[CAN FUNDAMENTAL]

TROUBLE DIAGNOSES WORK FLOW

2007 Pathfinder

INSPECTION OF VEHICLE CONDITION

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Check whether or not “U1000” or “U1001” is indicated on “SELF-DIAG RESULTS” by CONSULT-II.

NOTE:
Root cause cannot be detected using the procedure in this section if “U1000” or “U1001” is not indicated.

●

Check whether the symptom is reproduced or not.

NOTE:

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Never turn the ignition switch OFF or disconnect the battery cable while the reproducing the error. The
error may temporarily correct itself, making it difficult to determine the root cause.

●

The procedures for present errors differ from the procedures for past errors. Refer to 

LAN-25,

"DETECT THE ROOT CAUSE"

 .