Initial Inspection and Diagnostic Overview
General Troubleshooting InformationTroubleshooting CAN Circuit Related Problems
You can easily check the F-CAN and B-CAN connection status and DTCs by using one of the following methods:
- The HDS (preferred method) can check the F-CAN and B-CAN communication status,read and clear DTCs, display the data list, and perform function tests. Go to B-CAN System Diagnosis Test Mode A Troubleshooting - B-CAN System Diagnosis Test Mode A to check "Connected units" and DTCs.
- The AcuraLink Self-diagnostic Procedure can check communication status, and read and clear DTCs.
- The Gauge control module self-diagnosis function can check the F-CAN and B-CAN communication status.
- The MID (multi-information display) can read and clear DTCs.
- The B-CAN System Diagnosis Test Mode 1 and Test Mode 2 can check communication status and test some switch circuits.
If DTCs are retrieved, sort and troubleshoot DTCs in this order:
1. Battery voltage DTCs.
2. Internal error DTCs.
3. Loss of communication DTCs (beginning with the lowest number first: for example, if B1005 and B1008 are retrieved, troubleshoot B1005 first).
4. Signal error DTCs.
If no DTCs are retrieved, do the following:
- With HDS: Go to B-CAN System Diagnosis Test Mode C or D. Troubleshooting - B-CAN System Diagnosis Test Mode C
- Without HDS: Use B-CAN System Test Mode 2 to check all inputs related to failure.
BUS OFF and Internal Error Codes
Loss of Communication DTC Cross-reference Chart
When an ECU is unable to communicate with the other ECUs on the CAN circuit, the other control units will set loss of communication DTCs. Use this chart to find the control unit that is not communicating.
1. Find the Transmitting Control Unit that is in the same row as all of the loss of communication DTCs retrieved.
2. Perform the input test for the transmitting control unit.