Nissan Pathfinder (2010 year). Manual — part 480
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< FUNCTION DIAGNOSIS >
[CAN FUNDAMENTAL]
TROUBLE DIAGNOSIS
Example: TCM branch line open circuit
Example: Data link connector branch line open circuit
SKIB8738E
Unit name
Symptom
ECM
Engine torque limiting is affected, and shift harshness increases.
BCM
Reverse warning chime does not sound.
EPS control unit
Normal operation.
Combination meter
• Shift position indicator and OD OFF indicator turn OFF.
• Warning lamps turn ON.
ABS actuator and electric unit (control unit)
Normal operation.
TCM
No impact on operation.
IPDM E/R
Normal operation.
SKIB8739E
2010 Pathfinder
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TROUBLE DIAGNOSIS
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< FUNCTION DIAGNOSIS >
[CAN FUNDAMENTAL]
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NOTE:
• When data link connector branch line is open, transmission and reception of CAN communication signals
are not affected. Therefore, no symptoms occur. However, be sure to repair malfunctioning circuit.
• When data link connector branch line is open, “ECU list” displayed on the CONSULT-III “CAN DIAG SUP-
PORT MNTR” may be the same as when the CAN communication line has short-circuit. However, symp-
toms differ depending on the case. See below chart for the differences.
Example: Main Line Between Data Link Connector and ABS Actuator and Electric Unit (Control Unit) Open Circuit
Unit name
Symptom
ECM
Normal operation.
BCM
EPS control unit
Combination meter
ABS actuator and electric unit (control unit)
TCM
IPDM E/R
“ECU list” on the “CAN DIAG
SUPPORT MNTR”
(CONSULT-III)
Difference of symptom
Data link connector branch line open circuit
All Diag on CAN units are not
indicated.
Normal operation.
CAN-H, CAN-L harness short-circuit
Most of the units which are connected to the CAN
communication system enter fail-safe mode or are
deactivated.
SKIB8740E
Unit name
Symptom
ECM
Engine torque limiting is affected, and shift harshness increases.
BCM
• Reverse warning chime does not sound.
• The front wiper moves under continuous operation mode even though the front wip-
er switch being in the intermittent position.
EPS control unit
The steering effort increases.
Combination meter
• The shift position indicator and OD OFF indicator turn OFF.
• The speedometer is inoperative.
• The odo/trip meter stops.
ABS actuator and electric unit (control unit)
Normal operation.
2010 Pathfinder
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< FUNCTION DIAGNOSIS >
[CAN FUNDAMENTAL]
TROUBLE DIAGNOSIS
Example: CAN-H, CAN-L Harness Short Circuit
TCM
No impact on operation.
IPDM E/R
When the ignition switch is ON,
• The headlamps (Lo) turn ON.
• The cooling fan continues to rotate.
Unit name
Symptom
SKIB8741E
Unit name
Symptom
ECM
• Engine torque limiting is affected, and shift harshness increases.
• Engine speed drops.
BCM
• Reverse warning chime does not sound.
• The front wiper moves under continuous operation mode even though the front
wiper switch being in the intermittent position.
• The room lamp does not turn ON.
• The engine does not start (if an error or malfunction occurs while turning the igni-
tion switch OFF.)
• The steering lock does not release (if an error or malfunction occurs while turning
the ignition switch OFF.)
EPS control unit
The steering effort increases.
Combination meter
• The tachometer and the speedometer do not move.
• Warning lamps turn ON.
• 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,
• The headlamps (Lo) turn ON.
• The cooling fan continues to rotate.
2010 Pathfinder
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TROUBLE DIAGNOSIS
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< FUNCTION DIAGNOSIS >
[CAN FUNDAMENTAL]
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Self-Diagnosis
INFOID:0000000005530665
CAN Diagnostic Support Monitor
INFOID:0000000005530666
CONSULT-III and CAN diagnostic support monitor (on-board diagnosis function) are used for detecting root
cause.
MONITOR ITEM (CONSULT-III)
Example: CAN DIAG SUPPORT MNTR indication
Without PAST
DTC
Self-diagnosis item
(CONSULT-III indication)
DTC detection condition
Inspection/Action
U0101
LOST COMM (TCM)
When ECM is not transmitting or receiving CAN commu-
nication signal of OBD (emission-related diagnosis) from
TCM for 2 seconds or more.
Start the inspection. Refer
to the applicable section
of the indicated control
unit.
U0140
LOST COMM (BCM)
When ECM is not transmitting or receiving CAN commu-
nication signal of OBD (emission-related diagnosis) from
BCM for 2 seconds or more.
U0164
LOST COMM (HVAC)
When ECM is not transmitting or receiving CAN commu-
nication signal of OBD (emission-related diagnosis) from
A/C auto amp. or unified meter and A/C amp. for 2 sec-
onds or more.
U1000
CAN COMM CIRCUIT
ECM
When ECM is not transmitting or receiving
CAN communication signal of OBD (emission-
related diagnosis) for 2 seconds or more.
Except
for ECM
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 commu-
nication signal other than OBD (emission-related diagno-
sis) for 2 seconds or more.
U1002
SYSTEM COMM
When a control unit is not transmitting or receiving CAN
communication signal for 2 seconds or less.
U1010
CONTROL UNIT(CAN)
When an error is detected during the initial diagnosis for
CAN controller of each control unit.
Replace the control unit
indicating “U1010” or
“P0607”.
P0607
ECM
PKID1075E
2010 Pathfinder
LAN-12
< FUNCTION DIAGNOSIS >
[CAN FUNDAMENTAL]
TROUBLE DIAGNOSIS
With PAST
MONITOR ITEM (ON-BOARD DIAGNOSIS)
NOTE:
For some models, CAN communication diagnosis result is received from the vehicle monitor. (CONSULT-III is
not available.)
Example: Vehicle Display
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)
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)
2010 Pathfinder
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DIAGNOSIS AND REPAIR WORKFLOW
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< BASIC INSPECTION >
[CAN FUNDAMENTAL]
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BASIC INSPECTION
DIAGNOSIS AND REPAIR WORKFLOW
Information Needed for Trouble Diagnosis
INFOID:0000000005530667
CAN communication system performs trouble diagnosis with the following tools.
How to Use CAN Communication Signal Chart
INFOID:0000000005530668
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 copying on-board diagnosis data.
Diagnosis sheet
For detecting the root cause. (Diagnosis sheet includes system diagram for every CAN system type)
ECU list
(On the “CAN DIAG SUPPORT
MNTR”)
For checking the condition of control units and the status of CAN communication.
SELF-DIAG RESULTS
(CONSULT-III)
CAN DIAG SUPPORT MNTR
(CONSULT-III)
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
2010 Pathfinder
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< BASIC INSPECTION >
[CAN FUNDAMENTAL]
DIAGNOSIS AND REPAIR WORKFLOW
Trouble Diagnosis Flow Chart
INFOID:0000000005530669
Trouble Diagnosis Procedure
INFOID:0000000005530670
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
• What: Parts name, system name
• When: Date, Frequency
• Where: Road condition, Place
• In what condition: Driving condition/environment
PKID1210E
2010 Pathfinder
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DIAGNOSIS AND REPAIR WORKFLOW
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< BASIC INSPECTION >
[CAN FUNDAMENTAL]
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• Result: Symptom
NOTE:
• Check normal units as well as error symptoms.
- Example: Circuit between ECM and the combination meter is judged normal if the customer indicates
tachometer functions normally.
• When a CAN communication system error is present, multiple control units may malfunction or go into fail-
safe mode.
• Indication of the combination meter is important to detect the root cause because it is the most obvious to
the customer, and it performs CAN communication with many units.
INSPECTION OF VEHICLE CONDITION
• Check whether or not “U1000” or “U1001” is indicated on “SELF-DIAG RESULTS” by CONSULT-III.
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:
• Do not turn the ignition switch OFF or disconnect the battery cable while 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 “DETECT THE
ROOT CAUSE”.
CHECK OF CAN SYSTEM TYPE (HOW TO USE CAN SYSTEM TYPE SPECIFICATION CHART)
Determine CAN system type based on vehicle equipment. Then choose the correct diagnosis sheet.
NOTE:
There are two styles for CAN system type specification charts. Depending on the number of available system
types, either style A or style B may be used.
CAN System Type Specification Chart (Style A)
NOTE:
SKIB8717E
2010 Pathfinder
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