Diagnosis System

NETWORKING: CAN COMMUNICATION SYSTEM: DIAGNOSIS SYSTEM

1. BUS CHECK
(a) Select "CAN Bus Check" from "System Select".
2. CHECK INSTALLED SYSTEMS (ECUS AND SENSORS) THAT USE CAN COMMUNICATION
(a) Systems (ECUs and sensors) that use CAN communication vary depending on the optional settings of the vehicle. 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 stored by the ECU can be output 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".

(a) MASTER CYLINDER SOLENOID (SKID CONTROL ECU)
HINT:
DTC communication uses the CAN communication system.

(b) ECM/ECT
HINT:
DTC communication uses the CAN communication system.

(d) COMBINATION METER
HINT:
DTC communication uses the CAN communication system.

(e) SEAT BELT CONTROL ECU
For vehicles with the dynamic radar cruise control system only.
HINT:
DTC communication uses the CAN communication system.

(f) MULTIPLEX TILT AND TELESCOPIC ECU
HINT:
DTC communication uses the CAN communication system.

HINT:
*: Refer to the Power Tilt and Power Telescopic Steering Column System Power Tilt and Power Telescopic Steering Column System.

(g) DISPLAY AND NAVIGATION MODULE DISPLAY
For vehicles with the navigation system only.
HINT:
The display and navigation module display is connected to the CAN communication system but CAN communication DTCs are not stored.

(h) MULTI-DISPLAY
For vehicles without the navigation system only.
HINT:
The multi-display is connected to the CAN communication system but CAN communication DTCs are not stored.

(i) OUTER MIRROR CONTROL ECU
HINT:
The outer mirror control ECU is connected to the CAN communication system but CAN communication DTCs are not stored.

(j) CENTER AIRBAG SENSOR
HINT:
The center airbag sensor is connected to the CAN communication system but CAN communication DTCs are not stored.

(k) CERTIFICATION ECU (SMART KEY ECU)
HINT:
The certification ECU (smart key ECU) is connected to the CAN communication system but CAN communication DTCs are not stored.

(l) AIR CONDITIONING AMPLIFIER
HINT:
DTC communication uses the CAN communication system.

(m) POSITION CONTROL ECU AND SWITCH
HINT:
The position control ECU and switch is connected to the CAN communication system but CAN communication DTCs are not stored.

(n) TIRE PRESSURE WARNING ECU
HINT:
DTC communication uses the CAN communication system.

(o) NETWORK GATEWAY ECU
HINT:
DTC communication uses the CAN communication system.

(p) PARKING ASSIST ECU
For vehicles with the wide view front and side monitor system only.
HINT:
The parking assist ECU is connected to the CAN communication system but CAN communication DTCs are not stored.

(q) 4WD CONTROL ECU
HINT:
The 4WD control ECU is connected to the CAN communication system but CAN communication DTCs are not stored.

(r) NO. 2 MAIN BODY ECU
HINT:
The No. 2 main body ECU is connected to the CAN communication system but CAN communication DTCs are not stored.

(s) WINDSHIELD WIPER ECU
HINT:
The windshield wiper ECU is connected to the CAN communication system but CAN communication DTCs are not stored.

(t) POWER BACK DOOR UNIT (POWER BACK DOOR ECU)
For vehicles with the power back door system only.
HINT:
The power back door unit (power back door ECU) is connected to the CAN communication system but CAN communication DTCs are not stored.

(u) SUSPENSION CONTROL ECU
HINT:
DTC communication use the CAN communication system.

(v) DISTANCE CONTROL ECU
For vehicles with the dynamic radar cruise control system only.
HINT:
The distance control ECU is connected to the CAN communication system but CAN communication DTCs are not stored.

(w) AFS ECU (HEADLIGHT SWIVEL ECU)
HINT:
DTC communication uses the CAN communication system.

(x) STEERING CONTROL ECU
HINT:
DTC communication uses the CAN communication system.

(y) BUS BUFFER ECU
For vehicles with the LEXUS link system only.
HINT:
The bus buffer ECU is connected to the CAN communication system but CAN communication DTCs are not stored.

4. DTC COMBINATION TABLE

HINT:
o: Stored.
x: When one side of branch wire is open, storage may occur.
*1: Only stored when communication recovery has occurred. During communication stop, cannot be stored.
*2: Stored when vehicle speed is 15 km/h (9 mph) or more.
*3: This DTC is not stored when only the spd signal is lost. When any of DTCs C2121 to C2125 is stored and the spd signal is lost, this DTC is stored.
*4: Stored when vehicle speed is 30 km/h (18 mph) or more.

*5: The ECM receives diagnosis data from the distance control ECU and stores a DTC.
*6: The seat belt control ECU receives diagnosis data from the distance control ECU and stores a DTC.