Nissan-Datsun 370Z Technical 10-066 Date: 100507 Computers/Control - CAN Code, Diagnostic Tips/Guidelines Classification: EL10-017
Nissan-Datsun 370Z Technical 10-066 Date: 100507
Computers/Control - CAN Code, Diagnostic Tips/Guidelines
Classification: EL10-017
Reference: ITB10-066
Date: May 7, 2010
CAN COMMUNICATION CODES - DIAGNOSTIC TIPS & GUIDELINES
APPLIED VEHICLES: All 2005 - 2010 Nissan 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
Page 253
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 below. 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.
^ 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 254
Page 255
V-CAN Diagram Screen/CAN Diag Support Monitor - Step 3 Illustration
Page 256
Battery is Possibly Connected - disconnected and recheck resistence
Page 257
Normal Resistence - CAN Harness
Page 258
Normal Resistance - CAN High to Ground
Page 259
Normal Resistence - CAN Low to Ground
Page 260
Open CAN Harness
Page 261
Short - CAN High to CAN Low
Page 262
Normal Voltage - CAN High
Page 263
Normal Voltage - CAN Low
Computers/Control - CAN Code, Diagnostic Tips/Guidelines
Classification: EL10-017
Reference: ITB10-066
Date: May 7, 2010
CAN COMMUNICATION CODES - DIAGNOSTIC TIPS & GUIDELINES
APPLIED VEHICLES: All 2005 - 2010 Nissan 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
Page 253
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 below. 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.
^ 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 254
Page 255
V-CAN Diagram Screen/CAN Diag Support Monitor - Step 3 Illustration
Page 256
Battery is Possibly Connected - disconnected and recheck resistence
Page 257
Normal Resistence - CAN Harness
Page 258
Normal Resistance - CAN High to Ground
Page 259
Normal Resistence - CAN Low to Ground
Page 260
Open CAN Harness
Page 261
Short - CAN High to CAN Low
Page 262
Normal Voltage - CAN High
Page 263
Normal Voltage - CAN Low
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