Diagnosis System

NETWORKING: CAN COMMUNICATION SYSTEM: DIAGNOSIS SYSTEM

1. BUS CHECK

(a) Select "CAN Bus Check" from the "System Select " screen on the Techstream.

HINT
* If any properly connected ECUs or sensors are not displayed, there is a communication stop in the system Symptom Related Diagnostic Procedures.
* Display the communication BUS check screen for approximately 1 minute and check for ECUs and sensors that are not indicated on the screen.

2. CHECK INSTALLED SYSTEMS (ECUS AND SENSORS) THAT ADOPT CAN COMMUNICATION

(a) Systems (ECUs and sensors) that adopt CAN communication vary depending on the vehicle optional settings. Check which systems (ECUs and sensors) are installed on the vehicle.

3. DTC TABLE BY ECU

HINT
* In the CAN communication system, CAN communication system DTCs output by the ECU can be displayed by using the Techstream.
* If CAN communication system DTCs are output, the trouble cannot be determined solely from the DTCs. Perform troubleshooting according to "How to Proceed with Troubleshooting" How to Proceed With Troubleshooting.

(a) MULTIPLEX TILT AND TELESCOPIC ECU

For vehicles with seat memory only.

HINT
DTC communication uses the CAN communication system.

(b) MAIN BODY ECU

HINT
DTC communication uses the CAN communication system.

(c) ECM

HINT
* DTC communication uses the CAN communication system.
* Distance control ECU data is also output.

* *: Dynamic laser cruise DTC.

(d) SKID CONTROL ECU

HINT
DTC communication uses the CAN communication system.

(e) COMBINATION METER ECU

HINT
DTC communication uses the CAN communication system.

(f) AIR CONDITIONING AMPLIFIER

HINT
DTC communication uses the CAN communication system.

(g) SUSPENSION CONTROL ECU

For vehicles with air suspension system only.

HINT
DTC communication uses the CAN communication system.

(h) POWER STEERING ECU

HINT
DTC communication uses the CAN communication system.

(i) STEERING ANGLE SENSOR

HINT
The steering angle sensor is connected to the CAN communication system but CAN communication DTCs are not output.

(j) CENTER AIRBAG SENSOR

HINT
The center airbag sensor is connected to the CAN communication system but CAN communication DTCs are not output.

(k) POWER BACK DOOR ECU

For vehicles with power back door system only.

HINT
The power back door ECU is connected to the CAN communication system but CAN communication DTCs are not output.

(l) 4WD CONTROL ECU

For vehicles with 4WD only.

HINT
The 4WD control ECU is connected to the CAN communication system but CAN communication DTCs are not output.

(m) DISTANCE CONTROL ECU

For vehicles with dynamic laser cruise control system only.

HINT
The distance control ECU is connected to the CAN communication system but CAN communication DTCs are not output.

(n) BUS BUFFER ECU

For vehicles with bus buffer ECU only.

HINT
The bus buffer ECU is connected to the CAN communication system but CAN communication DTCs are not output.

(o) POWER SEAT CONTROL ECU

For vehicles with seat memory only.

HINT
The power seat control ECU is connected to the CAN communication system but CAN communication DTCs are not output.

(p) OUTER MIRROR CONTROL ECU

For vehicles with seat memory only.

HINT
The outer mirror control ECU is connected to the CAN communication system but CAN communication DTCs are not output.

4. DTC COMBINATION TABLE

HINT
* o: Stored.
* X: When one side of branch wire is open, storage may occur.
* *1: DTC may not be output when the CAN communication system malfunctions.
* *2: w/ Air Suspension
* *3: w/ Dynamic Laser Cruise Control System