Initial Inspection and Diagnostic Overview

How to Troubleshoot the Multiplex Integrated Control System

Troubleshooting CAN Circuit Related Problems

NOTE: Check the PCM for DTCs and troubleshoot PCM Initial Inspection and Diagnostic Overview or F-CAN loss of communication errors first.

Using the HDS (Preferred method)

Connect the HDS to the Data Link Connector (DLC).

NOTE: There are two ways to read B-CAN code with the HDS.

First method; Go to B-CAN System Diagnosis Test Mode A to check for DTCs. Troubleshooting - B-CAN System Diagnosis Test Mode A

Second method; Ground the SCS circuit with the HDS, then reed the DTCs displayed in the multi-information display (MID) in the gauge assembly, then go to B-CAN System Diagnosis Test Mode A. Troubleshooting - B-CAN System Diagnosis Test Mode A

Using the B-CAN System Diagnosis Test Mode 1 (Use only if the HDS is unavailable)

1. Check for communication circuit problems using B-CAN System Diagnostic Test Mode 1. Troubleshooting - B-CAN System Diagnosis Test Mode 1 and Test Mode 2 (without the HDS)

2. Check for DTCs.

3. If there are DTCs stored, sort them, and then troubleshoot the DTCs in this order.
-1 Battery voltage DTCs
Internal error DTCs
-3 Loss of communication DTCs
NOTE: If DTC U1280 is stored, troubleshoot DTC U1280 first.
-4 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. Troubleshooting - B-CAN System Diagnosis Test Mode 1 and Test Mode 2 (without the HDS)

How to display DTCs on the MID of the gauge control module

Enter the B-CAN System Diagnosis Test Mode 1. Troubleshooting - B-CAN System Diagnosis Test Mode 1 and Test Mode 2 (without the HDS) While in Test Mode 1, the DTCs which have been detected and stored individually by various B-CAN (Body-controller Area Network) units will be shown one by one on the multi-information display when the communication between the MICU and the gauge control module is normal. To scroll through the DTCs, press the SEL/RESET button.






The unit that has stored the code can be identified by the number shown on the multi-information display (MID).





How to clear DTCs

1. Enter the B-CAN System Diagnosis Test Mode 1. Troubleshooting - B-CAN System Diagnosis Test Mode 1 and Test Mode 2 (without the HDS)

2. While in Test Mode 1, press and hold down the SEL/RESET button for at least 10 seconds to clear the DTCs.

Loss of Communication DTC Cross-reference Chart

When an ECU on the CAN circuit 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 with the other control units on the CAN circuit.

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.

BUS OFF and Internal Error Codes

BUS OFF and Internal Error Codes:

Loss of Communication

Loss of Communication:

TX: Transmitting unit does not set a loss of communication DTC.