Toyota 4Runner manuals

Toyota 4Runner: Theft Deterrent System Communication Line High Fixation (B279A)

DESCRIPTION

If the communication line (EFIO-IMI) to the ID code box is stuck on HI output, the ECM stores this DTC.

DTC Code

DTC Detection Condition

Trouble Area

B279A

The communication line (EFIO-IMI) between the ECM and the ID code box is stuck on HI output.

  • Harness or connector
  • ID code box
  • ECM

WIRING DIAGRAM


CAUTION / NOTICE / HINT

NOTICE:

  • When the ID code box is replaced, refer to Registration (See page ).

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.

CLEAR DTC

(a) Clear the DTCs (See page ).


NEXT

2.

CHECK FOR DTC

(a) Check for DTCs (See page ).


HINT:

If DTCs other than DTC B279A are output, troubleshoot those DTCs first.

Result

Result

Proceed to

DTC B279A is not output

A

DTC B279A and other DTCs are output

B

DTC B279A is output

C


A

USE SIMULATION METHOD TO CHECK


B

Go to DIAGNOSTIC TROUBLE CODE CHART

C

3.

CHECK HARNESS AND CONNECTOR (ID CODE BOX - ECM)

(a) Disconnect the F72 box connector.

(b) Disconnect the F50 ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F72-6 (EFIO) - F50-14 (IMI)

Always

Below 1 Ω

F72-6 (EFIO) or F50-14 (IMI) - Body ground

Always

10 kΩ or higher


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

CHECK ID CODE BOX (OUTPUT)

(a) Using an oscilloscope, check the waveform.

Text in Illustration

*a

Component with harness connected

(ECM)

-

-

Measurement Condition

Item

Content

Tester Connection

F50-14 (IMI) - Body ground

Tool Setting

10 V/DIV., 100 ms./DIV.

Condition

Engine switch on (IG)

OK:

Waveform is output normally (refer to illustration).


OK

REPLACE ECM

NG

5.

CHECK HARNESS AND CONNECTOR (ID CODE BOX - BATTERY AND BODY GROUND)

(a) Disconnect the F72 box connector.


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

Standard Voltage:

Tester Connection

Condition

Specified Condition

F72-1 (+B) - Body ground

Always

11 to 14 V

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F72-8 (GND) - Body ground

Always

Below 1 Ω

Text in Illustration

*a

Front view of wire harness connector

(to ID Code Box)


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

6.

REPLACE ID CODE BOX

(a) Replace the ID code box (See page ).


NEXT

7.

REGISTER RECOGNITION CODES

(a) Register the recognition codes in the ECUs (See page ).


NEXT

8.

REGISTER ECU COMMUNICATION ID

(a) Register the ECU communication ID (See page ).


NEXT

9.

CLEAR DTC

(a) Clear the DTCs (See page ).


NEXT

10.

CHECK FOR DTC

(a) Check for DTCs (See page ).


OK:

DTC B279A is not output.


OK

END (ID CODE BOX IS DEFECTIVE)


NG

REPLACE ECM

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