Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: ECU Malfunction (C1611)

DESCRIPTION

If the clearance warning ECU assembly detects an internal malfunction during self-diagnosis, DTC C1611 is stored.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C1611	ECU Malfunction	Sub-CPU abnormal signal Mirror check abnormal	Clearance warning ECU assembly

CAUTION / NOTICE / HINT

NOTICE:

After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.
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After replacing an ultrasonic sensor or the clearance warning ECU assembly, perform the necessary procedures (adjustment, calibration, initialization or registration).
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PROCEDURE

1.	CHECK DTC OUTPUT

(a) Using the Techstream, check for DTCs according to the prompts on the screen.

HINT:

After turning the engine switch from off to on (IG), wait 3 seconds or more before checking for DTCs.

Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Trouble Codes

(b) Clear the DTCs according to the screen on the Techstream.

Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Clear DTCs

Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Trouble Codes

Result	Proceed to
DTC C1611 is output	A
DTC C1611 is not output	B

REPLACE CLEARANCE WARNING ECU ASSEMBLY

USE SIMULATION METHOD TO CHECK

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Sfi System: Engine Coolant Temperature Sensor 1 Signal Stuck in Range (P01152A)
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Toyota Avalon (XX50) 2019-2022 Owners Manual