Toyota Avalon Service & Repair Manual: Communication Error From Clearance Sonar ECU to VSC (C164B)

DESCRIPTION

The electronically controlled brake system receives intelligent clearance sonar system information from the clearance warning ECU assembly via CAN communication. When it is determined that there is a communication error between the skid control ECU and clearance warning ECU assembly, DTC C164B is stored.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C164B

Communication Error From Clearance Sonar ECU to VSC

A communication error between the skid control ECU and clearance warning ECU assembly is detected

  • Clearance warning ECU assembly
  • Electronically controlled brake system
  • Skid control ECU

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

(c) Recheck for DTCs.

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

HINT:

  • If DTC C164B is not output after clearing the DTCs, an intermittent communication error between the clearance warning ECU assembly and skid control ECU is suspected.
  • If DTC C164B 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 C164B is output

A

DTC C164B is not output

B

B

USE SIMULATION METHOD TO CHECK

A

2.

CHECK DTC OUTPUT

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

Chassis > ABS/VSC/TRAC > Trouble Codes

Result

Proceed to

DTC is not output

A

DTC is output

B

B

GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM

A

3.

REPLACE CLEARANCE WARNING ECU ASSEMBLY

(a) Replace the clearance warning ECU assembly with a known good one.

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NEXT

4.

CHECK DTC OUTPUT

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

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

(c) Recheck for DTCs.

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

Result

Proceed to

DTC C164B is output

A

DTC C164B is not output

B

A

REPLACE SKID CONTROL ECU

B

END (CLEARANCE WARNING ECU ASSEMBLY DEFECTIVE)

    Blind Spot Monitor Beam Axis Misalignment (C1AFA)

    Wheel Speed Sensor Malfunction (C164D)

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