Nissan Pathfinder (2007 year). Manual — part 285
TROUBLE DIAGNOSIS
LAN-11
[CAN FUNDAMENTAL]
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2007 Pathfinder
Example: CAN-H, CAN-L Harness Short Circuit
SKIB8741E
Unit name
Symptom
ECM
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Engine torque limiting is affected, and shift harshness increases.
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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.)
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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.
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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
"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
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[CAN FUNDAMENTAL]
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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:
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For some models, CAN communication diagnosis result is received from the vehicle monitor. (CONSULT-
II is not available.)
●
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
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[CAN FUNDAMENTAL]
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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
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[CAN FUNDAMENTAL]
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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:
●
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.
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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
●
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:
●
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.
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The procedures for present errors differ from the procedures for past errors. Refer to
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