ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1438/59

DTC Code	DTC Name
C1438/59	Lost Communication with HV ECU

DESCRIPTION

The skid control ECU assembly receives signals from the power management control ECU via the CAN communication system.

DTC No.	Detection Item	INF Code	DTC Detection Condition	Trouble Area	Note
C1438/59	Lost Communication with HV ECU	154 157	INF Code: 154 When IG2 terminal is 9.5 V or more, the signal that indicates the brake data cannot be received from the power management control ECU is received for 2 seconds or more. INF Code: 157 When IG2 terminal voltage is 9.5 V or more, the signal that indicates the brake date cannot be received from the power management control ECU once or more within 5 seconds occurs 10 times in succession.	CAN communication system Skid control ECU assembly	Electronically controlled brake system DTC

DTC No.

Detection Item

INF Code

DTC Detection Condition

Trouble Area

Note

C1438/59

Lost Communication with HV ECU

154

157

INF Code: 154

When IG2 terminal is 9.5 V or more, the signal that indicates the brake data cannot be received from the power management control ECU is received for 2 seconds or more.

INF Code: 157

When IG2 terminal voltage is 9.5 V or more, the signal that indicates the brake date cannot be received from the power management control ECU once or more within 5 seconds occurs 10 times in succession.

CAN communication system
Skid control ECU assembly

Electronically controlled brake system DTC

DTC No.	Brake warning light / yellow (minor malfunction) display code	ABS warning light display code	Slip indicator light display code	Brake hold standby indicator light display code
C1438	59	-	45	-

PROCEDURE

CONFIRM DTC

Clear the DTCs.

Click here

Chassis > ABS/VSC/TRC > Clear DTCs
Turn the power switch off.
Turn the power switch on (IG).

Check that no CAN communication system DTC is output.

Chassis > ABS/VSC/TRC > Trouble Codes

Tech Tips

If CAN communication system DTCs and relevant sensor DTCs are output simultaneously, troubleshoot the relevant sensor DTCs (for the ABS, VSC and/or electronically controlled brake system) after the CAN communication system returns to normal.

Click here

Result

Result	Proceed to
DTC (C1438/59) is not output	A
DTC (C1438/59) is output	B
DTC (CAN communication system DTC) is output	C

USE SIMULATION METHOD TO CHECK Click here

REPLACE SKID CONTROL ECU ASSEMBLY for RHD: Click here
REPLACE SKID CONTROL ECU ASSEMBLY for LHD: Click here

INSPECT CAN COMMUNICATION SYSTEM Click here