Initial Inspection and Diagnostic Overview

How to Troubleshoot the Multiplex Integrated Control System

Troubleshooting CAN Circuit Related Problems

NOTE: Check the ECM/PCM for DTCs and troubleshoot ECM/PCM, R18A1 engine, Reading and Clearing Diagnostic Trouble Codes K20Z3 engine Reading and Clearing Diagnostic Trouble Codes or F-CAN loss of communication errors first.

Using the HDS (Preferred method)

1. Go to B-CAN System Diagnosis Test Mode A to check for "Connected units" and DTCs. Troubleshooting - B-CAN System Diagnosis Test Mode A

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 Diagnosis Test Mode 1. Troubleshooting - B-CAN System Diagnosis Test Mode 1 And Test Mode 2 (Without The HDS)

2. Check for DTCs.

3. Sort, and then troubleshoot the DTCs in the order below.
-1 Battery voltage DTCs
Internal error DTCs
-3 Loss of communication DTCs
NOTE: If the DTC B1000 is stored, troubleshoot DTC B1000 first. B1000
-4 Signal error DTCs

4. If no DTCs are retrieved, use B-CAN System Diagnosis Test Mode 2 to check all inputs related to failure. Troubleshooting - B-CAN System Diagnosis Test Mode 1 And Test Mode 2 (Without The HDS)

How to display DTCs on the gauge control module (tach)

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 odometer 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 odometer/trip meter display.





How to clear the DTC

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 B-CAN and F-CAN circuits, 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