ITB13-006C
Service Bulletin Details
Public Details for: ITB13-006C
Can communication a?? Network diagnostic flow chart this bulletin has been amended. See amendment history on the last page. Please discard previous versions of this bulletin.
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Classification: Reference: Date: EL13-010C ITB13-006C February 22, 2022 CAN COMMUNICATION – NETWORK DIAGNOSTIC FLOW CHART This bulletin has been amended. See AMENDMENT HISTORY on the last page. Please discard previous versions of this bulletin. APPLIED VEHICLES: 2005 – 2022 Infiniti Vehicles EXCEPT: 2022 QX60 (L51) SERVICE INFORMATION This TSB is for troubleshooting of CAN Modules with “Diag-On-CAN” Diagnostics. The flow charts included 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 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. 1/8 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 2/8 ITB13-006C 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 internal issue Module is not installed Wrong Part Number Module is not programmed Wrong configuration B End Diagnosis 1 (See Claims Information) Go to on page 6 3/8 ITB13-006C 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 module connection No Check the following items: Confirm vehicle battery voltage Yes Check: power feeds, battery, ignition, fuses, relay, other module for bent pin, swapped pins, backed out pins, harness continuity. Check shorting pin Check to see if inline connectors are swapped Check to see if module was not connected Check DLC ground Check grounds Fix the issue Re-run diagnosis to verify issue is resolved. Measure Voltage/Resistance, match to type in table on page 7. Confirm good connection at front and back of DLC. Was DLC OK? 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) 4/8 ITB13-006C No C: Does CAN BUS have open circuit? Yes Disconnect all Diag-OnCAN modules D Go to on page 6 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? No Re-run diagnosis to verify issue resolved. Yes E Go to on page 3 5/8 End Diagnosis 4 (See Claims Information) ITB13-006C 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 End Diagnosis 5 (See Claims Information) Re-run diagnosis to verify issue is resolved. 6/8 ITB13-006C 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 7/8 Approximately 0.7v Approximately 0v 0v ITB13-006C CLAIMS INFORMATION Submit a Primary Part (PFP) type line claim using the following claims coding: OP NAME OP CODE FRT CAN DIAGNOSIS End Diag 1 RX3DAA 0.5 CAN DIAGNOSIS End Diag 2 RC3FAA 1.0 CAN DIAGNOSIS End Diag 3 RC3HAA 2.0 CAN DIAGNOSIS End Diag 4 RC3MAA 4.0 CAN DIAGNOSIS 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. AMENDMENT HISTORY PUBLISHED DATE REFERENCE DESCRIPTION March 22, 2013 ITB13-006 Original bulletin published August 22, 2013 ITB13-006A Updated to change End Diagnosis 5 to 4 and End Diagnosis 6 to 5 - ITB13-006B Not published February 22, 2022 ITB13-006C APPLIED VEHICLES revised and typo in CLAIMS INFORMATION corrected 8/8 ITB13-006C