Dtc C1Aec Front Sensor Communication Malfunction

Body Electrical. Camry. Acv40 Gsv40
Park Assist Monitoring. Camry. Acv40 Gsv40

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK DTC OUTPUT (C1AEC)

CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU - FRONT LEFT SENSOR)

CHECK HARNESS AND CONNECTOR (FRONT LEFT SENSOR - FRONT RIGHT SENSOR)

CHECK NO. 1 ULTRASONIC SENSOR (FRONT LEFT SENSOR)

REPLACE NO. 1 ULTRASONIC SENSOR (FRONT LEFT SENSOR)

CHECK DTC OUTPUT

REPLACE NO. 1 ULTRASONIC SENSOR (FRONT RIGHT SENSOR)

CHECK DTC OUTPUT

DTC C1AEC Front Sensor Communication Malfunction


DESCRIPTION

This DTC is stored when there is an open or short circuit in the communication line between the front sensors and the ECU, or when there is a malfunction in a front sensor.

DTC No.
DTC Detection Condition
Trouble Area
C1AEC
An open or short circuit in the communication line between the front sensors and ECU or a malfunction in a front sensor during initialization mode after the ignition switch is turned to ON.
  1. Front ultrasonic sensor circuit
  2. Clearance warning ECU

WIRING DIAGRAM


Camry. Acv40 Gsv40.Park Assist Monitoring.Toyota Parking Assist-Sensor System. Dtc C1Aec Front Sensor Communication Malfunction


INSPECTION PROCEDURE

1.CHECK DTC OUTPUT (C1AEC)

  1. Check for DTCs (CAMRY_ACV40 RM000000VKU01FX.html).

  1. Clear the DTCs (CAMRY_ACV40 RM000000VKU01FX.html).

  1. Recheck for DTCs (CAMRY_ACV40 RM000000VKU01FX.html).

    Result:
    Result
    		Proceed to
    DTC C1AEC is output
    		A
    No DTC is output
    		B


B
USE SIMULATION METHOD TO CHECK (CAMRY_ACV40 RM000000UZ301ZX.html)
A


2.CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU - FRONT LEFT SENSOR)


    Camry. Acv40 Gsv40.Park Assist Monitoring.Toyota Parking Assist-Sensor System. Dtc C1Aec Front Sensor Communication Malfunction

  1. Disconnect the O28 connector from the clearance warning ECU.

  1. Disconnect the A59 connector from the No. 1 ultrasonic sensor.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    O28-21 (BOF) - A59-1 (BI)
    		Always
    		Below 1 Ω
    O28-9 (SOF) - A59-3 (SI)
    O28-19 (E1) - A59-5 (EI)
    O28-21 (BOF) - Body ground
    		10 kΩ or higher
    O28-9 (SOF) - Body ground
    O28-19 (E1) - Body ground


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.CHECK HARNESS AND CONNECTOR (FRONT LEFT SENSOR - FRONT RIGHT SENSOR)


    Camry. Acv40 Gsv40.Park Assist Monitoring.Toyota Parking Assist-Sensor System. Dtc C1Aec Front Sensor Communication Malfunction

  1. Disconnect the A60 and A59 connectors from the No. 1 ultrasonic sensors.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A59-2 (BO) - A60-1 (BI)
    		Always
    		Below 1 Ω
    A59-4 (SO) - A60-3 (SI)
    A59-6 (EO) - A60-5 (EI)
    A59-2 (BO) - Body ground
    		10 kΩ or higher
    A59-4 (SO) - Body ground
    A59-6 (EO) - Body ground


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK NO. 1 ULTRASONIC SENSOR (FRONT LEFT SENSOR)

  1. Remove the No. 1 ultrasonic sensor (front left sensor) (CAMRY_ACV40 RM000001PYF01OX.html).



    Camry. Acv40 Gsv40.Park Assist Monitoring.Toyota Parking Assist-Sensor System. Dtc C1Aec Front Sensor Communication Malfunction

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1 (BI) - 5 (EI)
    		Always
    		10 kΩ or higher
    1 (BI) - 2 (BO)
    		Always
    		10 kΩ or higher
    3 (SI) - 4 (SO)
    		Always
    		Below 1 Ω
    5 (EI) - 6 (EO)
    		Always
    		Below 1 Ω


NG
REPLACE NO. 1 ULTRASONIC SENSOR (FRONT LEFT SENSOR) (CAMRY_ACV40 RM000001PYF01OX.html)
OK


5.REPLACE NO. 1 ULTRASONIC SENSOR (FRONT LEFT SENSOR)


    Camry. Acv40 Gsv40.Park Assist Monitoring.Toyota Parking Assist-Sensor System. Dtc C1Aec Front Sensor Communication Malfunction

  1. Replace the No. 1 ultrasonic sensor (front left sensor) with a normally functioning sensor (CAMRY_ACV40 RM000001PYF01OX.html).

    HINT:
    All of the sensors are interchangeable. To confirm whether a sensor is functioning normally, switch it with a known good sensor from the other end of the vehicle.

NEXT


6.CHECK DTC OUTPUT

  1. Clear the DTCs (CAMRY_ACV40 RM000000VKU01FX.html).

  1. Check for DTCs (CAMRY_ACV40 RM000000VKU01FX.html).

    Result:
    Result
    		Proceed to
    DTC C1AEC is output
    		A
    No DTC is output
    		B


B
END (FRONT LEFT SENSOR WAS DEFECTIVE)
A


7.REPLACE NO. 1 ULTRASONIC SENSOR (FRONT RIGHT SENSOR)


    Camry. Acv40 Gsv40.Park Assist Monitoring.Toyota Parking Assist-Sensor System. Dtc C1Aec Front Sensor Communication Malfunction

  1. Replace the No. 1 ultrasonic sensor (front right sensor) with a normally functioning sensor (CAMRY_ACV40 RM000001PYF01OX.html).

    HINT:
    All of the sensors are interchangeable. To confirm whether a sensor is functioning normally, switch it with a known good sensor from the other end of the vehicle.

NEXT


8.CHECK DTC OUTPUT

  1. Clear the DTCs (CAMRY_ACV40 RM000000VKU01FX.html).

  1. Check for DTCs (CAMRY_ACV40 RM000000VKU01FX.html).

    Result:
    Result
    		Proceed to
    DTC C1AEC is output
    		A
    No DTC is output
    		B


B
END (FRONT RIGHT SENSOR WAS DEFECTIVE)
A

REPLACE CLEARANCE WARNING ECU (CAMRY_ACV40 RM000001PYJ00TX.html)