Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Driving Support ECU Communication Abnormal (C1A52)

DESCRIPTION

The DTC C1A52 is stored when the Hybrid vehicle control ECU cannot recognize the driving support ECU assembly.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL
C1A52	Driving Support ECU Communication Abnormal	Approximately 17 seconds after the power switch is turned on (IG), the Hybrid vehicle control ECU cannot recognize the driving support ECU assembly for approximately 1.3 seconds or more.	Hybrid vehicle control ECU	Does not come on

CAUTION / NOTICE / HINT

NOTICE:

Before replacing the hybrid vehicle control ECU, refer to Registration.

Click here

PROCEDURE

1.	CHECK FOR DTCs

(a) Clear the DTCs.

Powertrain > Radar Cruise2 > Clear DTCs

(b) Make sure that the DTC detection conditions are met.

HINT:

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

Powertrain > Radar Cruise2 > Trouble Codes

Result	Proceed to
DTC C1A52 is not output	A
DTC C1A52 is output	B

USE SIMULATION METHOD TO CHECK

REPLACE HYBRID VEHICLE CONTROL ECU

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Pre-collision System(for Gasoline Model): Freeze Frame Data
FREEZE FRAME DATA DESCRIPTION (a) When a pre-collision system DTC is stored, the driving support ECU assembly stores the current vehicle (ECU or sensor) state as Freeze Frame Data. CHECK FREEZE FRAME DATA (a) Connect the Techstream to the DLC3. (b) Turn the engine switch on (IG). (c) Turn the Techst ...

Toyota Avalon (XX50) 2019-2022 Owners Manual