Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Rear Sensor Communication Malfunction (C1AED)

DESCRIPTION

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

DTC No.

DTC Detection Condition

Trouble Area

C1AED

An open or short circuit in the communication line between the rear sensors and ECU or a malfunction in a rear sensor during initialization mode after the ignition switch is turned ON.

  • Rear ultrasonic sensor circuit
  • Clearance warning ECU assembly

WIRING DIAGRAM

PROCEDURE

PROCEDURE

1.

CHECK DTC OUTPUT (C1AED)

(a) Check for DTCs (See page (b) Clear the DTCs (See page  ). ).

(b) Clear the DTCs (See page (c) Recheck for DTCs (See page  ). ).

(c) Recheck for DTCs (See page Result ).

Result

Result

Proceed to

DTC C1AED is output

A

No DTCs are output

B

B

USE SIMULATION METHOD TO CHECK

A

2.

CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - REAR CORNER SENSOR RH)

(a) Disconnect the C30 connector from the clearance warning ECU assembly.

(b) Disconnect the R43 connector from the No. 1 ultrasonic sensor.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C30-22 (BOR) - R43-1 (BI)

Always

Below 1 Ω

C30-24 (SOR) - R43-3 (SI)

C30-23 (E1) - R43-5 (EI)

C30-22 (BOR) - Body ground

10 kΩ or higher

C30-24 (SOR) - Body ground

C30-23 (E1) - Body ground

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

CHECK HARNESS AND CONNECTOR (REAR CORNER SENSOR RH - REAR CENTER SENSOR RH)

(a) Disconnect the R43 and R41 connectors from the No. 1 ultrasonic sensors.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

R43-2 (BO) - R41-1 (BI)

Always

Below 1 Ω

R43-4 (SO) - R41-3 (SI)

R43-6 (EO) - R41-5 (EI)

R43-2 (BO) - Body ground

10 kΩ or higher

R43-4 (SO) - Body ground

R43-6 (EO) - Body ground

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

CHECK HARNESS AND CONNECTOR (REAR CENTER SENSOR RH - REAR CENTER SENSOR LH)

(a) Disconnect the R41 and R40 connectors from the No. 1 ultrasonic sensors.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

R41-2 (BO) - R40-1 (BI)

Always

Below 1 Ω

R41-4 (SO) - R40-3 (SI)

R41-6 (EO) - R40-5 (EI)

R41-2 (BO) - Body ground

10 kΩ or higher

R41-4 (SO) - Body ground

R41-6 (EO) - Body ground

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

CHECK HARNESS AND CONNECTOR (REAR CENTER SENSOR LH - REAR CORNER SENSOR LH)

(a) Disconnect the R40 and R42 connectors from the No. 1 ultrasonic sensors.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

R40-2 (BO) - R42-1 (BI)

Always

Below 1 Ω

R40-4 (SO) - R42-3 (SI)

R40-6 (EO) - R42-5 (EI)

R40-2 (BO) - Body ground

10 kΩ or higher

R40-4 (SO) - Body ground

R40-6 (EO) - Body ground

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

6.

INSPECT NO. 1 ULTRASONIC SENSOR (REAR CORNER SENSOR RH)

(a) Remove the No. 1 ultrasonic sensor (rear corner sensor RH) (See page ).

(b) 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)

3 (SI) - 4 (SO)

Below 1 Ω

5 (EI) - 6 (EO)

Text in Illustration

*a

Component without harness connected

(No. 1 Ultrasonic Sensor (Rear Corner Sensor RH))

NG

REPLACE NO. 1 ULTRASONIC SENSOR (REAR CORNER SENSOR RH)

OK

7.

INSPECT NO. 1 ULTRASONIC SENSOR (REAR CENTER SENSOR RH)

(a) Remove the No. 1 ultrasonic sensor (rear center sensor RH) (See page ).

(b) 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)

3 (SI) - 4 (SO)

Below 1 Ω

5 (EI) - 6 (EO)

Text in Illustration

*a

Component without harness connected

(No. 1 Ultrasonic Sensor (Rear Center Sensor RH))

NG

REPLACE NO. 1 ULTRASONIC SENSOR (REAR CENTER SENSOR RH)

OK

8.

INSPECT NO. 1 ULTRASONIC SENSOR (REAR CENTER SENSOR LH)

(a) Remove the No. 1 ultrasonic sensor (rear center sensor LH) (See page ).

(b) 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)

3 (SI) - 4 (SO)

Below 1 Ω

5 (EI) - 6 (EO)

Text in Illustration

*a

Component without harness connected

(No. 1 Ultrasonic Sensor (Rear Center Sensor LH))

NG

REPLACE NO. 1 ULTRASONIC SENSOR (REAR CENTER SENSOR LH)

OK

9.

REPLACE NO. 1 ULTRASONIC SENSOR (REAR CORNER SENSOR RH)

NEXT

10.

CHECK DTC OUTPUT (C1AED)

(a) Clear the DTCs (See page (b) Check for DTCs (See page  ). ).

(b) Check for DTCs (See page Result ).

Result

Result

Proceed to

DTC C1AED is output

A

No DTCs are output

B

B

END (REAR CORNER SENSOR RH WAS DEFECTIVE)

A

11.

REPLACE NO. 1 ULTRASONIC SENSOR (REAR CENTER SENSOR RH)

NEXT

12.

CHECK DTC OUTPUT (C1AED)

(a) Clear the DTCs (See page (b) Check for DTCs (See page  ). ).

(b) Check for DTCs (See page Result ).

Result

Result

Proceed to

DTC C1AED is output

A

No DTCs are output

B

B

END (REAR CENTER SENSOR RH WAS DEFECTIVE)

A

13.

REPLACE NO. 1 ULTRASONIC SENSOR (REAR CENTER SENSOR LH)

NEXT

14.

CHECK DTC OUTPUT (C1AED)

(a) Clear the DTCs (See page (b) Check for DTCs (See page  ). ).

(b) Check for DTCs (See page Result ).

Result

Result

Proceed to

DTC C1AED is output

A

No DTCs are output

B

B

END (REAR CENTER SENSOR LH WAS DEFECTIVE)

A

15.

REPLACE NO. 1 ULTRASONIC SENSOR (REAR CORNER SENSOR LH)

NEXT

16.

CHECK DTC OUTPUT (C1AED)

(a) Clear the DTCs (See page (b) Check for DTCs (See page  ). ).

(b) Check for DTCs (See page Result ).

Result

Result

Proceed to

DTC C1AED is output

A

No DTCs are output

B

A

REPLACE CLEARANCE WARNING ECU ASSEMBLY

B

END (REAR CORNER SENSOR LH WAS DEFECTIVE)

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