Terminals Of Ecu

CHECK TRANSPONDER AMPLIFIER

Fig 1: Identifying Transponder Amplifier Terminals

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Disconnect the T5 amplifier connector, and measure the resistance between the terminal of the wire harness side connector and body ground.

Standard:

TERMINAL WIRING COLOR SPECIFIED CONDITION

Symbols (Terminal No.)	Wiring Color	Condition	Specified Condition
GND (T5-7) -Body ground	P-B (W) -Body ground	Constant	Below 1 Ω

If the result is not as specified, there may be a malfunction on the wire harness side.

Reconnect the T5 amplifier connector, and measure the voltage of each terminal of the connector.
Standard:

Fig 2: Identifying T5 Amplifier Connector Terminal Number And Specified Condition Table
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If the result is not as specified, the amplifier may have a malfunction.

Inspect using an oscilloscope.

Waveform 1 (Reference):

CODE-GND WAVEFORM REFERENCE

Terminal	CODE - GND
Tool Setting	5 V/DIV., 20 ms/DIV.
Condition	Key in ignition key cylinder.

Fig 3: CODE-GND Waveform - 1

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Waveform 2 (Reference):

TXCT - GND WAVEFORM REFERENCE

Terminal	TXCT - GND
Tool Setting	5 V/DIV., 20 ms/DIV.
Condition	Key in ignition key cylinder

Fig 4: TXCT - GND Waveform - 2

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CHECK TRANSPONDER KEY ECU

Fig 5: Identifying T11 ECU Connector Terminals

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Disconnect the T11 ECU connector, and measure the voltage or resistance between each terminal of the wire harness side connector.
Standard:

Fig 6: Identifying T11 ECU Connector Terminal Number And Specified Condition Table (1 Of 2)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

If the result is not as specified, there may be a malfunction on the wire harness side.
Reconnect the T11 ECU connector, and measure the voltage between each terminal of the connector.
Standard:

Fig 7: Identifying T11 ECU Connector Terminal Number And Specified Condition Table (2 Of 2)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

If the result is not as specified, the transponder key ECU may malfunction.

Inspect using an oscilloscope.

Waveform 1 (Reference):

EFO-GND WAVEFORM REFERENCE

Terminal	EFIO - GND
Tool Setting	5 V/DIV., 5 ms/DIV.
Condition	Key in ignition key cylinder

Fig 8: EFIO-GND Waveform 1

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Waveform 2 (Reference):

EFII-GND WAVEFORM REFERENCE

Terminal	EFII - GND
Tool Setting	5 V/DIV., 20 ms/DIV.
Condition	Key in ignition key cylinder

Fig 9: EFII-GND Waveform 2

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Waveform 3 (Reference):

OSCILLOSCOPE WAVEFORM REFERENCE

Terminal	CODE - GND
Tool Setting	5 V/DIV., 20 ms/DIV.
Condition	Key in ignition key cylinder

Fig 10: CODE-GND Waveform - 3

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Waveform 4 (Reference):

TXCT-GND WAVEFORM REFERENCE

Terminal	TXCT - GND
Tool Setting	5 V/DIV., 20 ms/DIV.
Condition	Key in ignition key cylinder

Fig 11: TXCT-GND Waveform - 4

CHECK ECM

Fig 12: Identifying ECM Terminals

Disconnect the E4, E5, E7 and E8 ECM connectors, and measure the voltage or resistance between each terminal of the wire harness side connectors.

Standard:

TERMINAL NUMBER AND SPECIFIED CONDITION

Symbols (Terminal No.)	Wiring Color	Condition	Specified Condition
E1 (E4-1)-Body ground	BR - Body ground	Constant	Below 1 Ω
E02 (E6-6) -Body ground	W-B - Body ground	Constant	Below 1 Ω
E01 (E6-7) -Body ground	W-B - Body ground	Constant	Below 1 Ω
IMI (E7-27) -E1 (E4-1)	R-G (W) - BR	No key in ignition key cylinder - With key	Waveform 1
IMO (E7-26) -E1 (E4-1)	R (W) - BR	No key in ignition key cylinder - With key	Waveform 2
+B(E8-1)-E1 (E4-1)	B-R (LG) - BR	Constant	9 to 14 V
BATT (E8-3) - E1 (E4-1)	R-W (SB) - BR	Constant	9 to 14 V
EOM (E8-15)-Body ground	BR (W) - Body ground	Constant	Below 1 Ω

If the result is not as specified, there may be a malfunction on the wire harness side.

Inspect using an oscilloscope.

Waveform 1 (Reference):

IMI-GND WAVEFORM REFERENCE

Terminal	IMI - GND
Tool Setting	5 V/DIV., 20 ms/DIV.
Condition	Key in ignition key cylinder

Fig 13: IMI-GND Waveform - 1

Waveform 2 (Reference):

IMO-GND WAVEFORM REFERENCE

Terminal	IMO - GND
Tool Setting	5 V/DIV., 5 ms/DIV.
Condition	Constant

Fig 14: IMO-GND Waveform - 2