Terminals Of Ecu

CHECK TRANSPONDER KEY AMPLIFIER

Disconnect the T9 amplifier connector.

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

Fig 1: Identifying T9 Connector Terminals

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TRANSPONDER KEY AMPLIFIER DISCONNECT

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
AGND (T9-7) - Body ground	Y - 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 T9 amplifier connector.

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

TRANSPONDER KEY AMPLIFIER (RECONNECT)

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
VC5 (T9-1) - AGND (T9-7)	GR - Y	Power source	No key in ignition key cylinder → Key inserted	0 V → 4.6 to 5.4 V
CODE (T9-4) - AGND (T9-7)	L - Y	Demodulated signal of key code data	No key in ignition key cylinder → Key inserted	Pulse generation (See WAVEFORM 1 )
TXCT (T9-5) - AGND (T9-7)	G - Y	Key code output signal	No key in ignition key cylinder → Key inserted	Pulse generation (See WAVEFORM 2 )

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

Inspect using an oscilloscope.

Waveform 1 (Reference):

WAVEFORM 1 REFERENCE

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

Fig 2: Waveform 1 Graph

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Waveform 2 (Reference):

WAVEFORM 2 REFERENCE

Terminal	CODE -AGND
Tool Setting	5 V/DIV., 20 ms/DIV.
Condition	No key in ignition key cylinder → Key inserted

Fig 3: Waveform 2 Graph

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CHECK TRANSPONDER KEY ECU ASSEMBLY

Fig 4: Identifying T10 Connector Terminals

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Disconnect the T10 ECU connector, and measure the voltage and resistance according to the value(s) in the table below.

TRANSPONDER KEY ECU ASSEMBLY VOLTAGE AND RESISTANCE SPECIFICATIONS

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
+B (T10-1) - GND (T10-16)	R-B - W-B	Battery	Always	10 to 14 V
IG (T10-2) - GND (T10-16)	B-W - W-B	Ignition switch	Ignition switch OFF → ON	Below 1 V → 10 to 14V
GND (T10-16) - 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.

Reconnect the T10 ECU connector, and measure the voltage according to the value(s) in the table below.

TRANSPONDER KEY ECU ASSEMBLY VOLTAGE SPECIFICATIONS

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
KSW (T10-3) - GND (T10-16)	L-B - W-B	Unlock warning switch	No key in ignition key cylinder → Key inserted	10 to 14 V → Below 1 V
TXCT (T10-4) - AGND (T10-5)	G - Y	Transponder key amplifier communication signal	Ignition switch ON	waveform 1
CTY (T10-7) - GND (T10-16)	R-W - W-B	Courtesy signal	Driver side door is open → closed	10 to 14 V → Below 1 V
IND (T10-8) - GND (T10-16)	R-W - W-B	Security indicator signal	Engine immobiliser system SET → UNSET	3 to 5 V → Below 1 V
D (T10-9) - GND (T10-16)	L-R - W-B	Diagnosis tester communication	Ignition switch ON	Pulse generation
EFII (T10-12) - GND (T10-16)	B - W-B	ECM input signal	Ignition switch ON	Waveform 4
EFIO (T10-13) - GND (T10-16)	W - W-B	ECM output signal	Ignition switch ON	Waveform 3
VC5 (T10-14) - AGND (T10-5)	GR - Y	Power source	Ignition switch OFF → ON	Below 1 V → 4.6 to 5.4 V
CODE (T10-15) - AGND (T10-5)	L - Y	Transponder key amplifier ground	Ignition switch ON	Waveform 2

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

Inspect using an oscilloscope.

Waveform 1 (Reference):

WAVEFORM 1 REFERENCE

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

Fig 5: Waveform 1 Graph

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Waveform 2 (Reference):

WAVEFORM 2 REFERENCE

Terminal	CODE -AGND
Tool Setting	5 V/DIV., 20 ms/DIV.
Condition	Ignition switch ON

Fig 6: Waveform 2 Graph

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Waveform 3 (Reference):

WAVEFORM 3 REFERENCE

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

Fig 7: Waveform 3 Graph

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Waveform 4 (Reference):

WAVEFORM 4 REFERENCE

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

Fig 8: Waveform 4 Graph

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

TRANSPONDER KEY ECU ASSEMBLY RESISTANCE

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
AGND (T10-5) - GND (T10-16)	Y - W-B	Amplifier ground circuit	Always	Below 1Ω

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

CHECK ECM

Fig 9: Identifying ECM Connectors

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

ECM VOLTAGE AND RESISTANCE SPECIFICATIONS

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
IMI(E5-27) - EOM(E6-15)	W - W-B	Transponder key ECU output signal	No key in ignition key cylinder → Key inserted	Pulse generation (see WAVEFORM 1 )
IMO(E5-26) - EOM(E6-15)	B - W-B	Transponder key ECU input signal	No key in ignition key cylinder → Key inserted	Pulse generation (see WAVEFORM 2 )
EOM (E6-15) - 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):

WAVEFORM 1 REFERENCE

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

Fig 10: Waveform 1 Graph

Waveform 2 (Reference):

WAVEFORM 2 REFERENCE

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

Fig 11: Waveform 2 Graph