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, Initial Inspection and Diagnostic Overview K20Z3 engine Initial Inspection and Diagnostic Overview 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 Diagnostic Test. 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
-2 Internal error DTCs
-3 Loss of communication DTCs
-3 NOTE: If the DTC B1000 is stored, troubleshoot DTC B1000 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 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)

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 select/reset button.






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





How to clear the DTC

While in Test Mode 1, press and hold down the SELECT/RESET button for more than 10 seconds.

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.

BUS OFF and Internal Error Codes