ITB13006A

Classificatio n:
Referen ce:
Date:
EL13-010a
ITB13-006a
August 22, 2013
2005-2013 INFINITI; CAN COMMUNICATION – NETWORK
DIAGNOSTIC FLOW CHART
Bulletin amended to change End Diagnosis 5 to 4 and End Diagnosis 6 to 5.
No other changes have been made to the body of this bulletin. Discard previous versions.
APPLIED VEHICLES:
All 2005 – 2013MY Infiniti Vehicles
SERVICE INFORMATION
This TSB is for troubleshooting of CAN Modules with “Diag-On-CAN” Diagnostics. The flow charts below are
meant to troubleshoot current CAN DTCs. The flow charts are intended to diagnose one module at a time;
repeat the process as needed for additional control units.
Definition of CAN Codes:
U1000 – missing ECM CAN communications not related to OBD2 system
U1000 – missing CAN communications for all other ECUs
U1001 – missing ECM CAN communications related to OBD2 system
U1002 – similar to U1000, but has a tighter timing spec to set the DTC
U1010 – Module has internal Issues
CLAIMS INFORMATION
Submit a Primary Part (PFP) type line claim using the following claims coding:
OP NAME
∗
∗
∗
OP CODE
FRT
CAN DIAGONSIS End Diag 1
RX3DAA
0.5
CAN DIAGONSIS End Diag 2
RC3FAA
1.0
CAN DIAGONSIS End Diag 3
RC3HAA
2.0
CAN DIAGONSIS End Diag 4
RC3MAA
4.0
CAN DIAGONSIS End Diag 5
RC3PAA
5.0
The PFP should be the part number of the component that was diagnosed with issues and replaced.
These operation codes cannot be claimed alone. They must be claimed in combination with the
replacement of the diagnosed component.
Use the appropriate Symptom and Diagnosis code which applies to the replaced component.
Infiniti Bulletins are intended for use by qualified technicians, not 'do-it-yourselfers'. Qualified technicians are properly trained
individuals who have the equipment, tools, safety instruction, and know-how to do a job properly and safely. NOTE: If you believe
that a described condition may apply to a particular vehicle, DO NOT assume that it does. See your Infiniti dealer to determine if this
applies to your vehicle.
1/7
Helpful Tips:
•
•
•
•
•
•
•
•
•
•
Always diagnose CAN communication codes first, U1000, U1001, U1002, U1010, then network codes,
UXXXX, and then all other codes.
A quick method to test CAN communications is to operate the vehicle’s functions such as Hazards,
Brakes, Tachometer, PRNDL, Speedometer, 4WD, Difflock, Seat Memory, Power Back Door or High
Beams.
In a low voltage situation (less than 10V), modules will stop communicating at different voltages.
Integrated Power Distribution Module (IPDM) is a smart relay and fuse box. It powers other modules in
the same way fuses and relays do.
CAN voltages can be checked via CONSULT.
Missing “Ignition 2” fuse or other high level fuses can cause CAN Diag Support Monitor to not work.
High level fuses such as “Ignition 1”, “Ignition 2” and “Elec B” power many modules.
Pins/terminals can be bent and still pass visual inspection.
When troubleshooting a harness that has multiple inline connections, section off the harness and
isolate it one portion at a time. Add a terminating resistor to the end of the harness in substitution of the
terminating modules.
If a module has multiple connectors, disconnect one at a time.
NOTE: 120 ohm resistors may be needed to perform diagnostics.
Normal CAN Measurements
CAN
Normal Resistance measurement
* kΩ = kilo Ohms, OC = open circuit
HI-LO
60Ω
HI-GND
kΩ-OC *
LO-GND
kΩ-OC *
Main Types of Issues:
Harness Issue
Module Issue
Harness & Module Issue
NOTE: DO NOT REPLACE ANY COMPONENTS UNLESS IT IS SUPPORTED BY DIAGNOSIS
NOTE: Use legend below for flow charts on pages 3-6 and Table A on page 7.
OC=Open Circuit; SC=Short Circuit; H=High; L=Low; Mid=Middle; Term=Terminating; V=voltage;
DLC=data link connector
2/7
ITB13-006a
Troubleshooting
Flowchart
START
Yes
Does Consult list all Diag-On-CAN
Modules all the time?
No
CAN Bus wires and termination
resistance are OK.
Cycle Ignition
A
Go to on
page 4
E
What current CAN DTCs are shown in
CONUSLT?
NOTE: if no current DTCs are shown, this TSB
does not apply. Reference the Electronic
Service Manual (ESM) for diagnosis of
intermittent issues.
U1000, U1001, U1002, and
other CAN related DTCs
UXXXX
Check the following items:
U1010
Replace the
module that sets
U1010.
•
Module was not connected
•
Module has internally issue
•
Module is not installed
•
Wrong Part Number
•
Module is not programmed
•
Wrong configuration
B
Go to on
page 6
End Diagnosis 1
(See Claims Information)
3/7
ITB13-006a
A
No, it’s
intermittent
Yes, CAN module(s) is
always missing
Does CONSULT not communicate with Diag on
CAN module(s)?
Does CAN Bus
resistance = 60Ω?
Check battery,
ignition and fuse
powering DLC.
Yes
Is missing module a
terminator module?
No
Check
terminator
Yes
Check DLC ground
Check: power feeds,
battery, ignition, fuses,
relay, other module for
bent pin, swapped pins,
backed out pins, harness
continuity.
No
Check the following items:
• Confirm vehicle battery
voltage
Confirm good
connection at front
and back of DLC.
Was DLC OK?
• Check shorting pin
• Check to see if inline
connectors are swapped
Check grounds
• Check to see if module
was not connected
Fix the issue
Re-run diagnosis to
verify issue is
resolved.
Measure Voltage/Resistance, match to
type in table on
page 7.
No
Yes
CAN Bus is shorted
or CAN circuits are
swapped
Measure
Voltage/Resistance, match to type
in chart on page 7.
Fix the issue
C
End Diagnosis 3
(See Claims Information)
Go to
on
page 5
Re-run diagnosis to
verify issue is
resolved.
End Diagnosis 2
(See Claims Information)
4/7
ITB13-006a
No
C: Does CAN BUS have open circuit?
Yes
Disconnect all Diag-OnCAN modules
D
Go to on
page 5
Replace each
terminating module with
120Ω resistor
Measure Voltage from
CAN H to L
Does Voltage = 0?
No
Yes
CAN Bus is shorted to
intermittent signal
Connect one (1) Diag-ONCAN Module.
Fix the issue
Check module diagnosis
via CONSULT.
Was communication
intermittent?
Yes
Replace the
module
No
Have all modules been
added?
Re-run diagnosis to verify
issue resolved.
Yes
E
Go to on
page 3
No
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End Diagnosis 4
(See Claims Information)
ITB13-006a
B
Yes
Was the issue fixed?
End Diagnosis 2
(See Claims Information)
No
Disconnect the module setting the CAN
DTC.
Run harness continuity check on
module under fault for CAN,
Power and Ground Circuits.
Yes
D
Does harness pass
continuity check?
No
There is a Wire Harness
issue
Re-run diagnosis. Go
back to START on page
3.
Check the following:
•
•
•
•
•
•
Connector/splice/joint/weld splice/inline
connector is loose.
Check fuse/relay or other module that
powers module setting CAN DTC
Check grounds
Check power feeds
Gateway jumper harness is missing
Check vehicle battery
Fix the issue
Re-run diagnosis to
verify issue is resolved.
End Diagnosis 5
(See Claims Information)
6/7
ITB13-006a
Harness Incident Type:
Use the Chart below to determine the type of Harness Incident.
• Measure CAN H or L to Ground at the DLC for Voltage.
•
Measure CAN H to L for resistance.
NOTE: Use the legend below for Table A.
OC=Open Circuit; SC=Short Circuit; H=High; L=Low; Mid=Middle; Term=Terminating; V=voltage;
DLC=data link connector
Table A
TYPE
RESISTANCE
CAN H V, KEY
OFF, CAN BUS
ASLEEP
CAN L V, KEY
OFF, CAN BUS
ASLEEP
CAN H V, KEY
ON
CAN L V, KEY
ON
Normal
60Ω
0v
0v
2.7v
2.3v
Main bus OC
Main bus OC of Can H
Main bus OC of CAN L
Branch OC
Branch OC CAN H
Branch OC CAN L
Branch OC at DLC
Branch OC at DLC CAN H
120Ω
120Ω
120Ω
60Ω
60Ω
60Ω
OC/MΩ
OC/MΩ
0v
0v
0v
0v
0v
0v
0v
0v
0v
0v
0v
0v
0v
0v
0v
0v
2.6v
2.6v
2.7v
2.7v
2.7v
2.7v
0v
0v
2.3v
2.2v
2.4v
2.3v
2.3v
2.3v
0v
2.3v
Branch OC at DLC CAN L
OC/MΩ
0v
0v
2.7v
0v
OC at Term ECU
120Ω
0v
0v
2.7v
2.3v
OC at Term ECU-CAN H
120Ω
0v
0v
2.7v
2.3v
OC at Term ECU-CAN L
120Ω
0v
0v
2.7v
2.3v
CAN H SC to Battery
N/A
B+
Approximately B+
B+
Approximately B+
CAN L SC to Battery
CAN H SC to Ignition
CAN L SC to Ignition
N/A
N/A
N/A
Approximately B+
Approximately B+
B+
0v
0v
B+
0v
0v
B+
Approximately B+
Approximately B+
B+
CAN H SC to Signal
Varies
Varies
Varies
Varies
Varies
CAN L SC to Signal
CAN H to L SC
CAN H SC to Ground
Varies
0Ω
161Ω
Varies
0v
0v
Varies
0v
0v
Varies
2.5v
0v
Varies
2.5v
CAN L SC to Ground
0Ω
0v
0v
7/7
Approximately
0.7v
Approximately 0v
0v
ITB13-006a