General Troubleshooting Information

General Troubleshooting Information

Troubleshooting CAN Circuit Related Problems

NOTE: Check the powertrain control module (PCM) for DTCs and troubleshoot PCM or F-CAN loss of communication errors first.

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.
- B-CAN System Diagnosis Test Mode 1 and Test Mode 2 can check communication status and test some switch circuits.

Using the HDS (Preferred method)

1. Go to B-CAN System Diagnosis Test Mode A Troubleshooting - B-CAN System Diagnosis Test Mode A to check for "Connected units" and DTCs.
2. If no DTCs are retrieved, go to B-CAN System Diagnosis Test Mode C Troubleshooting - B-CAN System Diagnosis Test Mode C or D Troubleshooting - B-CAN System Diagnosis Test Mode D.

Without HDS (Use only if the HDS is unavailable)

1. Check for communication circuit problems using B-CAN System Diagnostic Test.
2. Check for DTCs.
3. Sort, and then troubleshoot the DTCs in this order:
- Battery voltage DTCs
- Internal error DTCs
- Loss of communication DTCs (beginning with the lowest number first; for example, if B1008 and B1011 are retrieved, troubleshoot B1008 first). Refer to loss of communication cross reference chart.
- Signal error DTCs

4. If no DTCs are retrieved, use B-CAN System Diagnostic Test Mode 2 to check all inputs related to the failure.






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. Do the input test for the transmitting control unit.