2017 Infiniti G37 Sedan V6-3.7L Diagnostic and Repair Information # 10-029 Date: 100507

Computers/Control - CAN Code, Diagnostic Tips/Guidelines
Classification: EL10-018
Reference: ITB10-029
Date: May 7, 2010
CAN COMMUNICATION CODES - DIAGNOSTIC TIPS & GUIDELINES
APPLIED VEHICLES: All 2005 - 2010 Infiniti vehicles
SERVICE INFORMATION
Related to communication codes U1000, U1001, U1002, U1010:
^ Always diagnose the communication codes first.
^ When a module reports a U1000 code, it is typically operating normally; however, there is a communication error external to that module on the
CAN network.
^ U1000 indicates an error. V-CAN diagram or CAN Diag Support Monitor provides data to determine the location of the error.
Step 1
Complete the CAN diagnosis with CONSULT-III (C-III).
^ Open ASIST first and then open C-III using the Consult Utilities icon. This step will help identify the CAN type on many vehicles using the SIS
function.
^ Ensure the correct CAN type is selected. Selecting the incorrect CAN type will lead to mis-diagnosis.
Step 2
View the V-CAN screen or print all CAN Diag Support Monitors (Shown below).
^ The V-CAN diagram screen is a snap shot only. It must be refreshed after any changes.
Step 3
Read the V-CAN diagram using the key provided OR reference the appropriate Electronic Service Manual (ESM) to analyze the CAN Diag Support
Monitor data. Determine the incident according to the display.
Step 4
If V-CAN diagnosis is not available or inconclusive, refer to the basic CAN diagnostic guidelines shown on pages 5-12. These represent electrical
values of the CAN system measured at the Data Link Connector or connectors at non-termination units.
To properly perform these basic checks:
^ The battery should be disconnected for resistance checks.
^ The ignition should be off.
Tips if a control module is the suspected root cause:
^ Improper module configuration or incorrect part numbers may set CAN DTCs.
^ Low battery voltage may set CAN DTCs.
Page 257
^ Always confirm the power, ground, and CAN resistance at a suspect module before replacing the module. Resistance should be close to 60 ohms
at the module (measured with the battery disconnected). The resistance at terminating modules should be close to 120 ohms. Examples of
terminating modules include IPDM, ECM, or BCM. Reference the appropriate ESM to determine the terminating modules.
DEFINITION OF CAN CODES
Page 258
V-CAN DIAGRAM SCREEN/CAN DIAG SUPPORT MONITOR - STEP 3 ILLUSTRATION
Page 259
Battery Is Possibly Connected
Page 260
Normal Resistance - CAN Harness
Page 261
Normal Resistence - CAN High to Ground
Page 262
Normal Resistence - CAN Low to Ground
Page 263
Open CAN Harness
Page 264
Short - CAN High to CAN Low
Page 265
Normal Voltage - CAN High
Page 266
Normal Voltage - CAN Low