TOYOTA PARKING ASSIST-SENSOR SYSTEM, Diagnostic DTC:C1AF8

DTC Code DTC Name
C1AF8 Rr IPA Sensor Communication Circuit

DESCRIPTION

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

DTC No. Detection Item DTC Detection Condition Trouble Area
C1AF8 Rr IPA Sensor Communication Circuit An open or short circuit in the communication line between the rear side sensors and ECU or a malfunction in a rear side sensor during initialization mode after the power switch is turned on (IG).

  • Rear side ultrasonic sensor circuit

  • Harness or connector

  • Clearance warning ECU assembly

WIRING DIAGRAM

A003KRPE79
*a Rear Side Ultrasonic Sensor RH
*b Rear Side Ultrasonic Sensor LH
*c Clearance Warning ECU Assembly

PROCEDURE


  1. INTELLIGENT CLEARANCE SONAR SYSTEM REGISTRATION


    1. Perform intelligent clearance sonar system registration.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK DTC OUTPUT (C1AF8)


    1. Check for DTCs.

      Click here


      Body Electrical > IPA/ICS/Clearance Sonar > Trouble Codes

    2. Clear the DTCs.

      Click here


      Body Electrical > IPA/ICS/Clearance Sonar > Clear DTCs

    3. Recheck for DTCs.

      Click here


      Body Electrical > IPA/ICS/Clearance Sonar > Trouble Codes
      Result
      Result Proceed to
      DTC C1AF8 is output A
      No DTCs are output B

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

  3. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - REAR SIDE ULTRASONIC SENSOR LH)


    1. Disconnect the I28 clearance warning ECU assembly connector.

    2. Disconnect the P1 rear side ultrasonic sensor LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I28-21 (CSB2) - P1-4 (S1) Always Below 1 Ω
      I28-26 (LIN2) - P1-5 (S2) Always Below 1 Ω
      I28-25 (CSG2) - P1-6 (E2) Always Below 1 Ω
      I28-21 (CSB2) or P1-4 (S1) - Body ground Always 10 kΩ or higher
      I28-26 (LIN2) or P1-5 (S2) - Body ground Always 10 kΩ or higher
      I28-25 (CSG2) or P1-6 (E2) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (REAR SIDE ULTRASONIC SENSOR LH - REAR SIDE ULTRASONIC SENSOR RH)


    1. Disconnect the P2 rear side ultrasonic sensor RH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P1-1 (S3) - P2-4 (S5) Always Below 1 Ω
      P1-2 (S4) - P2-5 (S6) Always Below 1 Ω
      P1-3 (E3) - P2-6 (E4) Always Below 1 Ω
      P1-1 (S3) or P2-4 (S5) - Body ground Always 10 kΩ or higher
      P1-2 (S4) or P2-5 (S6) - Body ground Always 10 kΩ or higher
      P1-3 (E3) or P2-6 (E4) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT REAR SIDE ULTRASONIC SENSOR LH


    1. A003M0JC06
      *a

      Component without harness connected

      (Rear Side Ultrasonic Sensor LH)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      4 (S1) - 6 (E2) Always 10 kΩ or higher
      4 (S1) - 1 (S3) Always Below 1 Ω
      5 (S2) - 2 (S4) Always Below 30 Ω
      6 (E2) - 3 (E3) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE REAR SIDE ULTRASONIC SENSOR LH Click here

    OK

  6. INSPECT REAR SIDE ULTRASONIC SENSOR RH


    1. A003M0JC05
      *a

      Component without harness connected

      (Rear Side Ultrasonic Sensor RH)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      4 (S5) - 6 (E4) Always 10 kΩ or higher
      4 (S5) - 1 Always Below 1 Ω
      5 (S6) - 2 Always Below 30 Ω
      6 (E4) - 3 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE REAR SIDE ULTRASONIC SENSOR RH Click here

    OK

  7. REPLACE REAR SIDE ULTRASONIC SENSOR LH

    Result
    Proceed to
    NEXT

    1. Replace the rear side ultrasonic sensor LH with a new or known good one.

      Click here

      Tech Tips

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

      Result
      Proceed to
      NEXT

    NEXT

  8. CHECK DTC OUTPUT (C1AF8)


    1. Clear the DTCs.

      Click here


      Body Electrical > IPA/ICS/Clearance Sonar > Clear DTCs

    2. Check for DTCs.

      Click here


      Body Electrical > IPA/ICS/Clearance Sonar > Trouble Codes
      Result
      Result Proceed to
      DTC C1AF8 is output A
      No DTCs are output B

    B

    END (REAR SIDE ULTRASONIC SENSOR LH WAS DEFECTIVE)

    A

  9. REPLACE REAR SIDE ULTRASONIC SENSOR RH

    Result
    Proceed to
    NEXT

    1. Replace the rear side ultrasonic sensor RH with a new or known good one.

      Click here

      Tech Tips

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

      Result
      Proceed to
      NEXT

    NEXT

  10. CHECK DTC OUTPUT (C1AF8)


    1. Clear the DTCs.

      Click here


      Body Electrical > IPA/ICS/Clearance Sonar > Clear DTCs

    2. Check for DTCs.

      Click here


      Body Electrical > IPA/ICS/Clearance Sonar > Trouble Codes
      Result
      Result Proceed to
      DTC C1AF8 is output A
      No DTCs are output B

    A

    REPLACE CLEARANCE WARNING ECU ASSEMBLY Click here

    B

    END (REAR SIDE ULTRASONIC SENSOR RH WAS DEFECTIVE)