PRE-CRASH SAFETY SYSTEM, Diagnostic DTC:U0100, U0125, U0126, U0129, U0235, U023A, U1002, U1104

DTC Code	DTC Name
U0100	Lost Communication with ECM / PCM "A"
U0125	Lost Communication with Yaw Rate Sensor Module
U0126	Lost Communication with Steering Angle Sensor Module
U0129	Lost Communication with Brake System Control Module
U0235	Lost Communication with Cruise Control Front Distance Range Sensor
U023A	Lost Communication with Front Camera Module
U1002	Lost Communication with Gateway Module
U1104	Lost Communication with Driving Support ECU

DESCRIPTION

DTC Code	DTC Detection Item	DTC Detection Condition	Inspection Area
U0100	ECM communication error.	When driving the vehicle at a speed of 5 km/h or more, a communication error between the ECM and the driving support ECU assembly is detected for approximately 5 seconds.	CAN communication system Driving support ECU assembly ECM
U0125	Lost Communication with Yaw Rate Sensor Module	When the engine switch is on (IG), a communication error between the yaw rate sensor and the driving support ECU assembly is detected for approximately 1 second.	CAN communication system Airbag sensor assembly Driving support ECU assembly
U0126	Lost Communication with Steering Angle Sensor Module	When the engine switch is on (IG), a communication error between the steering sensor and the driving support ECU assembly is detected for approximately 4 seconds.	CAN communication system Spiral with sensor cable sub-assembly Driving support ECU assembly
U0129	Lost Communication with Brake System Control Module	When the engine switch is on (IG), a communication error between the master cylinder solenoid (skid control ECU) and the driving support ECU assembly is detected for approximately 3 seconds.	CAN communication system Master cylinder solenoid (skid control ECU) Driving support ECU assembly
U0235	Lost Communication with Cruise Control Front Distance Range Sensor	When the engine switch is on (IG), a communication error between the millimeter wave radar sensor assembly and the driving support ECU assembly is detected for approximately 1 second.	CAN communication system Millimeter wave radar sensor assembly Driving support ECU assembly
U023A	Lost Communication with Front Camera Module	When the engine switch is on (IG), a communication error between the forward recognition camera and driving support ECU assembly is detected for approximately 2 seconds.	CAN communication system Forward recognition camera Driving support ECU assembly
U1002	Lost Communi cation with Gateway Module	When the engine switch is on (IG), communication between the driving support ECU and any of the following components is abnormal for 2 seconds or more. Forward recognition camera Millimeter wave radar sensor assembly	CAN communication system Forward recognition camera Millimeter wave radar sensor assembly Driving support ECU assembly
U1104	Lost Communication with Driving Support ECU	When the engine switch is on (IG), a communication error between the driving support ECU assembly and the millimeter wave radar sensor assembly is detected for approximately 0.2 seconds. When the engine switch is on (IG), a communication error between the driving support ECU assembly and the forward recognition camera is detected for approximately 0.2 seconds. When the engine switch is on (IG), a communication error between the driving support ECU assembly and the master cylinder solenoid (skid control ECU) is detected for approximately 1.5 seconds.	CAN communication system Master cylinder solenoid (skid control ECU) Forward recognition camera Millimeter wave radar sensor assembly Driving support ECU assembly

CAUTION / NOTICE / HINT

Tech Tips

When 2 or more DTCs starting with "U" are output simultaneously, inspect the connectors and wire harnesses of each ECU.

PROCEDURE

CHECK DTC (CAN COMMUNICATION SYSTEM)

Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Enter the following menus: Body Electrical / Pre-Crash 2 / Trouble Codes.
Clear the DTCs Click here.
Make sure that the DTC detection conditions are met.

Tech Tips

If the detection conditions are not met, the system cannot detect the malfunction.

Check for DTCs Click here.

Result
Result	Proceed to
DTC U0100, U0125, U0126, U0129, U0235, U023A, U1002 or U1104 is not output	A
DTC U0100, U0125, U0126, U0129, U0235, U023A, U1002 and U1104 are output (for LHD)	B
DTC U0100, U0125, U0126, U0129, U0235, U023A, U1002 and U1104 are output (for RHD)	C

USE SIMULATION METHOD TO CHECK Click here

GO TO CAN COMMUNICATION SYSTEM Click here