Nissan Frontier. Manual — part 965
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< SYSTEM DESCRIPTION >
[CAN FUNDAMENTAL]
TROUBLE DIAGNOSIS
Self-Diagnosis
INFOID:0000000009479090
If communication signals cannot be transmitted or received among units communicating via CAN communica-
tion line, CAN communication-related DTC is displayed on the CONSULT “Self Diagnostic Result” screen.
NOTE:
The following table shows examples of CAN communication-related DTC. For other DTC, refer to the applica-
ble sections.
CAN Diagnostic Support Monitor
INFOID:0000000009479091
CONSULT and CAN diagnostic support monitor (on-board diagnosis function) are used for detecting root
cause.
MONITOR ITEM (CONSULT)
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.
DTC
Self-diagnosis item
(CONSULT indication)
DTC detection condition
Inspection/Action
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.
Start the inspection. Refer
to the applicable section
of the indicated control
unit.
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”.
LAN
TROUBLE DIAGNOSIS
LAN-11
< SYSTEM DESCRIPTION >
[CAN FUNDAMENTAL]
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Example: CAN DIAG SUPPORT MNTR indication
Without PAST
With PAST
MONITOR ITEM (ON-BOARD DIAGNOSIS)
NOTE:
For some models, CAN communication diagnosis result is received from the vehicle monitor. (CONSULT is
not available.)
JSMIA0812GB
Item
PRESENT
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
PRESENT
PAST
Description
Transmission di-
agnosis
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 diag-
nosis)
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.
Not diagnosed
–
Diagnosis not performed.
No control unit for receiving signals. (No applicable optional parts)
LAN-12
< SYSTEM DESCRIPTION >
[CAN FUNDAMENTAL]
TROUBLE DIAGNOSIS
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)
LAN
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:0000000009479092
CAN communication system performs trouble diagnosis with the following tools.
How to Use CAN Communication Signal Chart
INFOID:0000000009479093
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)
SELF-DIAG RESULTS
(CONSULT)
For checking the condition of control units and the status of CAN communication.
CAN DIAG SUPPORT MNTR
(CONSULT)
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
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