Nissan Pathfinder (2007 year). Manual — part 284
PRECAUTIONS
LAN-3
[CAN FUNDAMENTAL]
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2007 Pathfinder
PRECAUTIONS
PFP:00001
Precautions When Using CONSULT-II
UKS006H2
Use CONSULT-II CONVERTER when connecting CONSULT-II to data link connector.
CAUTION:
CAN communication does not function properly if CONSULT-II is used without connecting CONSULT-II
CONVERTER.
Precautions for Trouble Diagnosis
UKS006H3
CAUTION:
●
Never apply 7.0 V or more to the measurement terminal.
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Use a tester with open terminal voltage of 7.0 V or less.
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Turn the ignition switch OFF and disconnect the battery cable from the negative terminal when
checking the harness.
Precautions for Harness Repair
UKS006H4
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Solder the repaired area and wrap tape around the soldered
area.
NOTE:
A fray of twisted lines must be within 110 mm (4.33 in).
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Bypass connection is never allowed at the repaired area.
NOTE:
Bypass connection may cause CAN communication error. The
spliced wire becomes separated and the characteristics of
twisted line are lost.
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Replace the applicable harness as an assembly if error is detected on the shield lines of CAN communi-
cation line.
SKIB8766E
SKIB8767E
LAN-4
[CAN FUNDAMENTAL]
SYSTEM DESCRIPTION
2007 Pathfinder
SYSTEM DESCRIPTION
PFP:00000
CAN Communication System
UKS006H5
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CAN communication is a multiplex communication system. This enables the system to transmit and
receive large quantities of data at high speed by connecting control units with two communication lines
(CAN-H and CAN-L).
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Control units on the CAN network transmit signals using the CAN communication control circuit. They
receive only necessary signals from other control units to operate various functions.
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CAN communication lines adopt twisted-pair line style (two lines twisted) for noise immunity.
SYSTEM DIAGRAM
Each control unit passes an electric current to the termination circuits when transmitting CAN communication
signal. The termination circuits produce an electrical potential difference between CAN-H and CAN-L. CAN
communication system transmits and receives CAN communication signals by the potential difference.
SKIB8887E
Component
Description
Main line
CAN communication line between splices
Branch line
CAN communication line between splice and a control unit
Splice
A point connecting a branch line with a main line
Termination circuit
Refer to
SYSTEM DESCRIPTION
LAN-5
[CAN FUNDAMENTAL]
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2007 Pathfinder
CAN COMMUNICATION CONTROL CIRCUIT
*: These are the only control units wired with both ends of CAN communication system.
SKIB8713E
Component
System description
CAN controller
It controls CAN communication signal transmission and reception, error detection, etc.
Transceiver IC
It converts digital signal into CAN communication signal, and CAN communication signal into digi-
tal signal.
Noise filter
It eliminates noise of CAN communication signal.
Termination circuit
*
(Resistance of approx. 120
Ω
)
It produces potential difference.
LAN-6
[CAN FUNDAMENTAL]
SYSTEM DESCRIPTION
2007 Pathfinder
Diag on CAN
UKS006H6
DESCRIPTION
“Diag on CAN” is a diagnosis using CAN communication instead of previous DDL1 and DDL2 communication
line, between control unit and diagnosis unit.
SYSTEM DIAGRAM
SKIB8714E
Name
Harness
Description
DDL1
Tx
Rx
It is used for trouble diagnosis. (CAN-H and CAN-L are used for controlling)
DDL2
K-LINE
It is used for trouble diagnosis. (CAN-H and CAN-L are used for controlling)
Diag on CAN
CAN-H
CAN-L
It is used for trouble diagnosis and control.
TROUBLE DIAGNOSIS
LAN-7
[CAN FUNDAMENTAL]
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2007 Pathfinder
TROUBLE DIAGNOSIS
PFP:00004
Condition of Error Detection
UKS006H7
“U1000” or “U1001” is indicated on SELF-DIAG RESULTS on CONSULT-II if CAN communication signal is not
transmitted or received between units for 2 seconds or more.
CAN COMMUNICATION SYSTEM ERROR
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CAN communication line open (CAN-H, CAN-L, or both)
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CAN communication line short (ground, between CAN communication lines, other harnesses)
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Error of CAN communication control circuit of the unit connected to CAN communication line
WHEN INDICATED “U1000” OR “U1001” IS INDICATED EVEN THOUGH CAN COMMUNICA-
TION SYSTEM IS NORMAL
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CONSULT-II CONVERTER not connected: Error may be detected by the self-diagnosis when not using
CONSULT-II CONVERTER (Depending on the control unit which carries out CAN communication).
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Removal/installation of parts: Error may be detected when removing and installing CAN communication
unit and related parts while turning the ignition switch ON. (A DTC except for CAN communication may be
detected.)
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Fuse blown out (removed): CAN communication of the unit may cease.
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Voltage drop: Error may be detected if voltage drops due to discharged battery when turning the ignition
switch ON (Depending on the control unit which carries out CAN communication).
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Error may be detected if the power supply circuit of the control unit, which carries out CAN communica-
tion, malfunctions (Depending on the control unit which carries out CAN communication).
●
Error may be detected if reprogramming is not completed normally.
NOTE:
CAN communication system is normal if “U1000” or “U1001” is indicated on SELF-DIAG RESULTS of CON-
SULT-II under the above conditions. Erase the memory of the self-diagnosis of each unit.
LAN-8
[CAN FUNDAMENTAL]
TROUBLE DIAGNOSIS
2007 Pathfinder
Symptom When Error Occurs in CAN Communication System
UKS006H8
In CAN communication system, multiple units mutually transmit and receive signals. Each unit cannot transmit
and receive signals if any error occurs on CAN communication line. Under this condition, multiple control units
related to the root cause malfunction or go into fail-safe mode.
ERROR EXAMPLE
NOTE:
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Each vehicle differs in symptom of each unit under fail-safe mode and CAN communication line wiring.
●
Refer to
for the unit abbreviation.
Example: TCM 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
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Shift position indicator and OD OFF indicator turn OFF.
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Warning lamps turn ON.
ABS actuator and electric unit (control unit)
Normal operation.
TCM
No impact on operation.
IPDM E/R
Normal operation.
TROUBLE DIAGNOSIS
LAN-9
[CAN FUNDAMENTAL]
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2007 Pathfinder
Example: Data link connector branch line open circuit
NOTE:
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When data link connector branch line is open, transmission and reception of CAN communication signals
is not affected. Therefore, no symptoms occur. However, be sure to repair malfunctioning circuit.
●
When data link connector branch line is open, the screen-display of the CONSULT-II “SELECT SYSTEM”
screen may be the same as when the CAN communication line has short-circuit. However, symptoms dif-
fer depending on the case. See below chart for the differences.
SKIB8739E
Unit name
Symptom
ECM
Normal operation.
BCM
EPS control unit
Combination meter
ABS actuator and electric unit (control unit)
TCM
IPDM E/R
SELECT SYSTEM
(CONSULT-II)
Difference of symptom
Data link connector branch line open cir-
cuit
All Diag on CAN units are not
indicated.
Normal operation.
CAN-H, CAN-L harness short-circuit
Most the units which are connected to the CAN com-
munication system enter fail-safe mode or are deac-
tivated.
LAN-10
[CAN FUNDAMENTAL]
TROUBLE DIAGNOSIS
2007 Pathfinder
Example: Main Line Between Data Link Connector and ABS Actuator and Electric Unit (Con-
trol Unit) Open Circuit
SKIB8740E
Unit name
Symptom
ECM
Engine torque limiting is affected, and shift harshness increases.
BCM
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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.
EPS control unit
The steering effort increases.
Combination meter
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The shift position indicator and OD OFF indicator turn OFF.
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The speedometer is inoperative.
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The odo/trip meter stops.
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.
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