Terminals Of Ecu

CHECK TRANSPONDER KEY AMPLIFIER

Fig 1: Identifying T8 Amplifier Connector Terminals

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Disconnect the T8 amplifier connector.

Measure the resistance of the wire harness side connector.

Standard:

TRANSPONDER KEY AMPLIFIER - RESISTANCE TABLE

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
GND (T8-7) - Body ground	V - Body ground	Ground	Always	Below 1 Ω

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

Reconnect the T8 amplifier connector.

Measure the voltage and resistance of the connector.

Standard:

TRANSPONDER KEY AMPLIFIER - VOLTAGE TABLE

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
+B (T8-1) - GND (T8-7)	O-V	Power source	No key in ignition key cylinder --> Key inserted	0 V --> 4.6 to 5.4V
CODE (T8-4) - GND (T8-7)	R-W - V	Demodulated signal of key code data	No key in ignition key cylinder --> Key inserted	Pulse generation (see waveform 1)
TXCT (T8-5) - GND (T8-7)	L-B - V	Key code output signal	No key in ignition key cylinder --> Key inserted	Pulse generation (see waveform 2)
GND (T8-7) - Body ground	V - Body ground	Ground	Always	Below 1 Ω

If the result is not as specified, the amplifier may have a malfunction.

Inspect using an oscilloscope.

Fig 2: Identifying Waveform 1 Graph

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Waveform 1 (Reference):

WAVEFORM 1 REFERENCE TABLE

Terminal	CODE - GND
Tool Setting	10 V/DIV., 20 ms/DIV.
Condition	No key in ignition key cylinder --> Key inserted

Waveform 2 (Reference):

Fig 3: Identifying Waveform 2 Graph

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WAVEFORM 2 REFERENCE TABLE

Terminal	TXCT - GND
Tool Setting	5 V/DIV., 20 ms/DIV.
Condition	No key in ignition key cylinder --> Key inserted

CHECK TRANSPONDER KEY ECU ASSY

Fig 4: Identifying T9 ECU Connector Terminals

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Disconnect the T9 ECU connector.

Measure the voltage and resistance of the wire harness side connector.

Standard:

TRANSPONDER KEY ECU - VOLTAGE TABLE

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
AGND (T9-13) - Body ground	V - Body ground	Ground	Always	Below 1 Ω
CPUB (T9-1) - GND (T9-14)	V-Y - W-B	Battery	Always	10 to 14V
IG2 (T9-2) - AGND (T9-13)	B-V	Ignition switch	Ignition switch OFF --> ON	0V --> 10 to 14V
KSW (T9-3) - AGND (T9-13)	LG-B - V	Unlock warning switch	No key in ignition key cylinder --> Key inserted	10 kΩ or higher --> Below 1 Ω

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

Reconnect the T9 ECU connector.

Measure the voltage of the connector.

Standard:

TRANSPONDER KEY ECU - VOLTAGE TABLE

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
KSW (T9-3) - AGND (T9-13)	LG-B - V	Unlock warning switch	No key in ignition key cylinder --> Key inserted	10 to 14V 0V
VC5 (T9-9) - AGND (T9-13)	O - V	Power source	Ignition switch OFF --> ON	0 V --> 4.6 to 5.4V
TXCT (T9-12) - AGND (T9-13)	L-B - V	Transponder key amplifier communication signal	Ignition switch OFF --> ON	Pulse generation (see waveform 1)
CODE (T9-10) - AGND (T9-13)	R-W - V	Transponder key amplifier communication signal	Ignition switch OFF --> ON	Pulse generation (see waveform 2)
EFIO (T9-6) - AGND (T9-13)	B-Y - V	ECM output signal	Ignition switch OFF --> ON	Pulse generation (see waveform 3)
EFII (T9-7) - AGND (T9-13)	GR-R - V	ECM input signal	Ignition switch OFF --> ON	Pulse generation (see waveform 4)

If the result is not as specified, the ECU may have a malfunction.

Inspect using an oscilloscope.

Waveform 1 (Reference):

Fig 5: Identifying Waveform 1 Graph

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

WAVEFORM 1 REFERENCE TABLE

Terminal	TXCT - GND
Tool Setting	5 V/DIV., 20 ms/DIV.
Condition	Ignition switch OFF --> ON

Waveform 2 (Reference):

Fig 6: Identifying Waveform 2 Graph

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

WAVEFORM 2 REFERENCE TABLE

Terminal	CODE - GND
Tool Setting	10 V/DIV., 20 ms/DIV.
Condition	Ignition switch OFF --> ON

Waveform 3 (Reference):

Fig 7: Identifying Waveform 3 Graph

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

WAVEFORM 3 REFERENCE TABLE

Terminal	EFIO - GND
Tool Setting	10 V/DIV., 500 ms/DIV.
Condition	Ignition switch OFF --> ON

Waveform 4 (Reference):

Fig 8: Identifying Waveform 4 Graph

WAVEFORM 4 REFERENCE TABLE

Terminal	EFII - GND
Tool Setting	10 V/DIV., 500 ms/DIV.
Condition	Ignition switch OFF --> ON

CHECK ECM

Fig 9: Identifying ECM Connectors

Disconnect the E2 and E4 ECM connectors.

Measure the voltage and resistance of the wire harness side connectors.

Standard:

ECM CONNECTORS - REFERENCE TABLE

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
IMI (E2-6) - E01 (E4-2)	GR-G - W-B	Transponder key ECU input signal	No key in ignition key cylinder --> Key inserted	Pulse generation (see waveform 1)
IMO (E2-7) - E01 (E4-2)	GR-R - W-B	Transponder key ECU output signal	No key in ignition key cylinder --> Key inserted	Pulse generation (see waveform 2)
E01 (E4-2) - Body ground	W-B - Body ground	Ground	Always	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):

Fig 10: Identifying Waveform 1 Graph

WAVEFORM 1 REFERENCE TABLE

Terminal	IMI - GND
Tool Setting	10 V/DIV., 500 ms/DIV.
Condition	No key in ignition key cylinder --> Key inserted

Waveform 2 (Reference):

Fig 11: Identifying Waveform 2 Graph

WAVEFORM 2 REFERENCE TABLE

Terminal	IMO - GND
Tool Setting	10 V/DIV., 500 ms/DIV.
Condition	No key in ignition key cylinder --> Key inserted