Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: ENG / EHV Device (C1A40)

DESCRIPTION

When a EFI system malfunction signal sent by the ECM is detected by the clearance warning ECU assembly, DTC C1A40 is stored.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C1A40	ENG / EHV Device	When the engine switch is on (IG), a EFI system malfunction signal is detected for 1 second or more.	EFI system 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 4 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

HINT:

DTC C1A40 is stored when a malfunction signal sent from the EFI system is detected.
If the malfunctioning part has been repaired or replaced before rechecking for DTCs, DTC C1A40 will not be output again.
If DTC C1A40 is output frequently, duplicate the conditions that cause the problem symptoms and perform troubleshooting again, even though the DTC was not output when rechecking for DTCs.
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Result	Proceed to
DTC C1A40 is output	A
DTC C1A40 is not output	B

GO TO EFI SYSTEM

USE SIMULATION METHOD TO CHECK

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Navigation System(for Gasoline Model): Certification ECU Vehicle Information Reading/Writing Process Malfunction (B15F7)
DESCRIPTION This DTC is stored when items controlled by the certification ECU (smart key ECU assembly) cannot be customized via the navigation system vehicle customization screen. HINT: The certification ECU (smart key ECU assembly) controls the smart key system related items that are customizable v ...

Toyota Avalon (XX50) 2019-2022 Owners Manual