Theft Deterrent System Communication Line High Fixation (B279A)

DESCRIPTION

If the communication line (EFIO-IMI) to the transponder key ECU assembly is stuck high output (e.g. shorted to +B), the ECM stores this DTC.

DTC No.	DTC Detection Condition	Trouble Area
B279A	Communication line (EFIO-IMI) between the ECM and transponder key ECU assembly is stuck high output.	Wire harness or connector Transponder key ECU assembly ECM

WIRING DIAGRAM
CAUTION / NOTICE / HINT

NOTICE:

• If the transponder key ECU assembly is replaced, register the key and ECU communication ID (See page ).
• If the ECM is replaced, register the ECU communication ID (See page ).

PROCEDURE

1. CHECK DTC OUTPUT

(a) Recheck for DTCs (See page ).

HINT:

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

Result	Proceed to
DTC B279A is output	A
DTC B279A and other DTCs are output	B

B

GO TO DTC CHART

A

1. CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - ECM)

(a) Disconnect the transponder key ECU assembly connector.

(b) Disconnect the ECM connector.

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

Standard Resistance:

for 2GR-FE

Tester Connection	Condition	Specified Condition
D22-13 (EFIO) - A41-40 (IMI)	Always	Below 1 Ω
D22-13 (EFIO) - Body ground	Always	10 kΩ or higher
A41-40 (IMI) - Body ground	Always	10 kΩ or higher

for 1AR-FE

Tester Connection	Condition	Specified Condition
D22-13 (EFIO) - A49-11 (IMI)	Always	Below 1 Ω
D22-13 (EFIO) - Body ground	Always	10 kΩ or higher
A49-11 (IMI) - Body ground	Always	10 kΩ or higher

Standard Voltage:

Tester Connection	Condition	Specified Condition
D22-13 (EFIO) - Body ground	Always	Below 1 V

Text in Illustration

*1	Front view of wire harness connector (to Transponder Key ECU Assembly)
*2	Front view of wire harness connector (to ECM)
*3	for 2GR-FE
*4	for 1AR-FE

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

1. CHECK TRANSPONDER KEY ECU ASSEMBLY (OUTPUT)

(a) Reconnect the transponder key ECU assembly connector.

(b) Reconnect the ECM connector.

(c) Using an oscilloscope, check the waveform. Waveform 1 (Reference): Item Content Terminal No. (Symbols) D22-13 (EFIO) - D22-16 (GND) Tool Setting 2 V/DIV., 1 s./DIV. Condition Ignition switch ON Result: Result Proceed to NG A OK (for 2GR-FE) B OK (for 1AR-FE) C Text in Illustration *1 Component with harness connected (Transponder Key ECU Assembly)

B

REPLACE ECM

C

REPLACE ECM

A

1. REPLACE TRANSPONDER KEY ECU ASSEMBLY

(a) Replace the transponder key ECU assembly (See page ).

NEXT

1. REGISTER KEY

(a) Register the key (See page ).

NEXT

1. REGISTER ECU COMMUNICATION ID

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

NEXT

1. CHECK DTC OUTPUT

(a) Clear the DTCs (See page ).

(b) Recheck for DTCs (See page ).

OK:

DTC B279A is not output.

Result	Proceed to
OK	A
NG (for 2GR-FE)	B
NG (for 1AR-FE)	C

A

END (TRANSPONDER KEY ECU WAS DEFECTIVE)

B

REPLACE ECM

C

REPLACE ECM