TOYOTA PARKING ASSIST-SENSOR SYSTEM(for 8 Sensor Type), Diagnostic DTC:C1AEC

DTC Code DTC Name
C1AEC Front Sensor Communication Circuit

DESCRIPTION

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

DTC No. Detection Item DTC Detection Condition Trouble Area
C1AEC Front Sensor Communication Circuit 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.

  • Front ultrasonic sensor circuit

  • Clearance warning ECU assembly

WIRING DIAGRAM

A01VAD0E14

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs.

      Click here

    2. Recheck for DTCs.

      Click here

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

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

  2. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - NO. 1 ULTRASONIC SENSOR [FRONT CORNER SENSOR LH])


    1. Disconnect the G166 clearance warning ECU assembly connector.

    2. Disconnect the Z1 No. 1 ultrasonic sensor (front corner sensor LH) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G166-4 (BOF) - Z1-1 (BI) Always Below 1 Ω
      G166-8 (SOF) - Z1-3 (SI) Always Below 1 Ω
      G166-6 (E5) - Z1-5 (EI) Always Below 1 Ω
      G166-4 (BOF) or Z1-1 (BI) - Body ground Always 10 kΩ or higher
      G166-8 (SOF) or Z1-3 (SI) - Body ground Always 10 kΩ or higher
      G166-6 (E5) or Z1-5 (EI) - Body ground Always 10 kΩ or higher
      Result
      Result
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (NO. 1 ULTRASONIC SENSOR [FRONT CORNER SENSOR LH] - NO. 2 ULTRASONIC SENSOR [FRONT CENTER SENSOR LH])


    1. Disconnect the Z1 No. 1 ultrasonic sensor (front corner sensor LH) connector.

    2. Disconnect the Z2 No. 2 ultrasonic sensor (front center sensor LH) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Z1-2 (BO) - Z2-1 (BI) Always Below 1 Ω
      Z1-4 (SO) - Z2-3 (SI) Always Below 1 Ω
      Z1-6 (EO) - Z2-5 (EI) Always Below 1 Ω
      Z1-2 (BO) or Z2-1 (BI) - Body ground Always 10 kΩ or higher
      Z1-4 (SO) or Z2-3 (SI) - Body ground Always 10 kΩ or higher
      Z1-6 (EO) or Z2-5 (EI) - Body ground Always 10 kΩ or higher
      Result
      Result
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (NO. 2 ULTRASONIC SENSOR [FRONT CENTER SENSOR LH] - NO. 2 ULTRASONIC SENSOR [FRONT CENTER SENSOR RH])


    1. Disconnect the Z2 No. 2 ultrasonic sensor (front center sensor LH) connector.

    2. Disconnect the Z3 No. 2 ultrasonic sensor (front center sensor RH) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Z2-2 (BO) - Z3-1 (BI) Always Below 1 Ω
      Z2-4 (SO) - Z3-3 (SI) Always Below 1 Ω
      Z2-6 (EO) - Z3-5 (EI) Always Below 1 Ω
      Z2-2 (BO) or Z3-1 (BI) - Body ground Always 10 kΩ or higher
      Z2-4 (SO) or Z3-3 (SI) - Body ground Always 10 kΩ or higher
      Z2-6 (EO) or Z3-5 (EI) - Body ground Always 10 kΩ or higher
      Result
      Result
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (NO. 2 ULTRASONIC SENSOR [FRONT CENTER SENSOR RH] - NO. 1 ULTRASONIC SENSOR [FRONT CORNER SENSOR RH])


    1. Disconnect the Z3 No. 2 ultrasonic sensor (front center sensor RH) connector.

    2. Disconnect the Z4 No. 1 ultrasonic sensor (front cornor sensor RH) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Z3-2 (BO) - Z4-1 (BI) Always Below 1 Ω
      Z3-4 (SO) - Z4-3 (SI) Always Below 1 Ω
      Z3-6 (EO) - Z4-5 (EI) Always Below 1 Ω
      Z3-2 (BO) or Z4-1 (BI) - Body ground Always 10 kΩ or higher
      Z3-4 (SO) or Z4-3 (SI) - Body ground Always 10 kΩ or higher
      Z3-6 (EO) or Z4-5 (EI) - Body ground Always 10 kΩ or higher
      Result
      Result
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT NO. 1 ULTRASONIC SENSOR (FRONT CORNER SENSOR RH)


    1. Remove the No. 1 ultrasonic sensor (front corner sensor RH).

      Click here

    2. Inspect the No. 1 ultrasonic sensor (front corner sensor RH).

      Click here

      Result
      Result
      OK
      NG

    NG

    REPLACE NO. 1 ULTRASONIC SENSOR (FRONT CORNER SENSOR RH) Click here

    OK

  7. INSPECT NO. 2 ULTRASONIC SENSOR (FRONT CENTER SENSOR RH)


    1. Remove the No. 2 ultrasonic sensor (front center sensor RH).

      Click here

    2. Inspect the No. 2 ultrasonic sensor (front center sensor RH).

      Click here

      Result
      Result
      OK
      NG

    NG

    REPLACE NO. 2 ULTRASONIC SENSOR (FRONT CENTER SENSOR RH) Click here

    OK

  8. INSPECT NO. 2 ULTRASONIC SENSOR (FRONT CENTER SENSOR LH)


    1. Remove the No. 2 ultrasonic sensor (front center sensor LH).

      Click here

    2. Inspect the No. 2 ultrasonic sensor (front center sensor LH).

      Click here

      Result
      Result
      OK
      NG

    NG

    REPLACE NO. 2 ULTRASONIC SENSOR (FRONT CENTER SENSOR LH) Click here

    OK

  9. INSPECT NO. 1 ULTRASONIC SENSOR (FRONT CORNER SENSOR LH)


    1. Remove the No. 1 ultrasonic sensor (front corner sensor LH).

      Click here

    2. Inspect the No. 1 ultrasonic sensor (front corner sensor LH).

      Click here

      Result
      Result
      OK
      NG

    NG

    REPLACE NO. 1 ULTRASONIC SENSOR (FRONT CORNER SENSOR LH) Click here

    OK

  10. REPLACE NO. 1 ULTRASONIC SENSOR (FRONT CORNER SENSOR RH)


    1. Replace the No. 1 ultrasonic sensor (front corner sensor RH) with a normally functioning sensor.

      Click here

      Result
      Result
      NEXT

    NEXT

  11. CHECK FOR DTC (C1AEC)


    1. Clear the DTCs.

      Click here

    2. Check for DTCs.

      Click here

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

    B

    END (NO. 1 ULTRASONIC SENSOR [FRONT CORNER SENSOR RH] WAS DEFECTIVE)

    A

  12. REPLACE NO. 2 ULTRASONIC SENSOR (FRONT CENTER SENSOR RH)


    1. Replace the No. 2 ultrasonic sensor (front center sensor RH) with a normally functioning sensor.

      Click here

      Result
      Result
      NEXT

    NEXT

  13. CHECK FOR DTC (C1AEC)


    1. Clear the DTCs.

      Click here

    2. Check for DTCs.

      Click here

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

    B

    END (NO. 2 ULTRASONIC SENSOR [FRONT CENTER SENSOR RH] WAS DEFECTIVE)

    A

  14. REPLACE NO. 2 ULTRASONIC SENSOR (FRONT CENTER SENSOR LH)


    1. Replace the No. 2 ultrasonic sensor (front center sensor LH) with a normally functioning sensor.

      Click here

      Result
      Result
      NEXT

    NEXT

  15. CHECK FOR DTC (C1AEC)


    1. Clear the DTCs.

      Click here

    2. Check for DTCs.

      Click here

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

    B

    END (NO. 2 ULTRASONIC SENSOR [FRONT CENTER SENSOR LH] WAS DEFECTIVE)

    A

  16. REPLACE NO. 1 ULTRASONIC SENSOR (FRONT CORNER SENSOR LH)


    1. Replace the No. 1 ultrasonic sensor (front corner sensor LH) with a normally functioning sensor.

      Click here

      Result
      Result
      NEXT

    NEXT

  17. CHECK FOR DTC (C1AEC)


    1. Clear the DTCs.

      Click here

    2. Check for DTCs.

      Click here

      Result
      Result Proceed to
      DTC C1AEC is output (for LHD) A
      DTC C1AEC is output (for RHD) B
      No DTC is output C

    A

    REPLACE CLEARANCE WARNING ECU ASSEMBLY Click here

    B

    REPLACE CLEARANCE WARNING ECU ASSEMBLY Click here

    C

    END (NO. 1 ULTRASONIC SENSOR (FRONT CORNER SENSOR LH) WAS DEFECTIVE)