ENGINE IMMOBILISER SYSTEM > TERMINALS OF ECU

CHECK TRANSPONDER KEY AMPLIFIER

Disconnect the T20 amplifier connector.
Measure the resistance of the wire harness side connector.

Symbols (Terminal No.)
Wiring Color
Terminal Description
Condition
Specified Condition
GND (T20-7) - Body ground
L-O - Body ground
Ground
Always
Below 1 Ω
1. If the result is not as specified, there may be a malfunction on the wire harness side.
Reconnect the T20 amplifier connector.

Measure the resistance and voltage of the connector.

Symbols (Terminal No.)
Wiring Color
Terminal Description
Condition
Specified Condition
GND (T20-7) - Body ground
L-O - Body ground
Ground
Always
Below 1 Ω
VC5 (T20-1) - GND (T20-7)
L - L-O
Power source
No key in ignition key cylinder
Below 1 V
Key inserted
4.6 to 5.4 V
CODE (T20-4) - GND (T20-7)
L-Y - L-O
Demodulated signal of key code data
No key in ignition key cylinder
Below 1 V
Key inserted
Pulse generation (see waveform 1)
TXCT (T20-5) - GND (T20-7)
L-B - L-O
Key code output signal
No key in ignition key cylinder
Below 1 V
Key inserted
Pulse generation (see waveform 2)

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

Inspect using an oscilloscope.
1. Waveform 1 (Reference)
  Symbols (Terminal No.)
  Tool Setting
  Condition
  CODE (T20-4) - GND (T20-7)
  2 V/DIV., 20 msec./DIV.
  Key inserted
2. Waveform 2 (Reference)
  Symbols (Terminal No.)
  Tool Setting
  Condition
  TXCT (T20-5) - GND (T20-7)
  2 V/DIV., 20 msec./DIV.
  Key inserted

CHECK TRANSPONDER KEY ECU ASSEMBLY

Disconnect the T21 ECU connector.

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

Symbols (Terminal No.)
Wiring Color
Terminal Description
Condition
Specified Condition
AGND (T21-5) - Body ground
L-O - Body ground
Ground
Always
Below 1 Ω
GND (T21-16) - Body ground
G - Body ground
Ground
Always
Below 1 Ω
+B (T21-1) - GND (T21-16)
L-Y - G
Power source supply
Always
10 to 14 V
IG (T21-2) - GND (T21-16)
B-O - G
Ignition power supply
Ignition switch OFF
Below 1 V
Ignition switch ON
10 to 14 V
KSW (T21-3) - GND (T21-16)
BR - G
Unlock warning switch
No key in ignition key cylinder
10 kΩ or higher
Key inserted
Below 1 Ω

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

Reconnect the T21 ECU connector.

Measure the voltage of the connector.

Symbols (Terminal No.)
Wiring Color
Terminal Description
Condition
Specified Condition
VC5 (T21-14) - AGND (T21-5)
L - L-O
Power source of transponder key amplifier
No key in ignition key cylinder
Below 1 V
Key is inserted
4.6 to 5.4 V
CODE (T21-15) - AGND (T21-5)
L-Y - L-O
Transponder key amplifier communication signal
No key in ignition key cylinder
Below 1 V
Key is inserted
Pulse generation (see waveform 1)
TXCT (T21-4) - AGND (T21-5)
L-B - L-O
Transponder key amplifier communication signal
No key in ignition key cylinder
Below 1 V
Key is inserted
Pulse generation (see waveform 2)
EFIO (T21-13) - E0M (T21-11)
Y-G - W-B
ECM output signal
Ignition switch OFF
Below 1 V
Ignition switch ON
Pulse generation (see waveform 3)
EFII (T21-12) - E0M (T21-11)
Y-B - W-B
ECM input signal
Ignition switch OFF
Below 1 V
Ignition switch ON
Pulse generation (see waveform 4)

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

Inspect using an oscilloscope.
1. Waveform 1 (Reference)
  Symbols (Terminal No.)
  Tool Setting
  Condition
  CODE (T21-15) - AGND (T21-5)
  2 V/DIV., 20 msec./DIV.
  Key inserted
2. Waveform 2 (Reference)
  Symbols (Terminal No.)
  Tool Setting
  Condition
  TXCT (T21-4) - AGND (T21-5)
  2 V/DIV., 20 msec./DIV.
  Key inserted
3. Waveform 3 (Reference)
  Symbols (Terminal No.)
  Tool Setting
  Condition
  EFIO (T21-13) - E0M (T21-11)
  10 V/DIV., 100 msec./DIV.
  Ignition switch ON
4. Waveform 4 (Reference)
  Symbols (Terminal No.)
  Tool Setting
  Condition
  EFII (T21-12) - E0M (T21-11)
  10 V/DIV., 100 msec./DIV.
  Ignition switch ON

CHECK ECM (2TR-FE)

Measure the voltage and resistance of the connectors.

Symbols (Terminal No.)
Wiring Color
Terminal Description
Condition
Specified Condition
IMI (E10-16) - E0M (E9-29)
Y-G - W-B
Transponder key ECU input signal
Ignition switch OFF
Below 1 V
Ignition switch ON
Pulse generation (see waveform 1)
IMO (E10-15) - E0M (E9-29)
Y-B -W-B
Transponder key ECU output signal
Ignition switch OFF
Below 1 V
Ignition switch ON
Pulse generation (see waveform 2)
E01 (E12-7) - Body ground
W-B - Body ground
Ground
Always
Below 1 Ω
E02 (E12-6) - Body ground
W-B - Body ground
Ground
Always
Below 1 Ω
EC (E9-22) - Body ground
R - Body ground
Ground
Always
Below 1 Ω

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

Inspect using an oscilloscope.
1. Waveform 1 (Reference)
  Symbols (Terminal No.)
  Tool Setting
  Condition
  IMI (E10-16) - E0M (E9-29)
  10 V/DIV., 100 msec./DIV.
  Ignition switch ON
2. Waveform 2 (Reference)
  Symbols (Terminal No.)
  Tool Setting
  Condition
  IMO (E10-15) - E0M (E9-29))
  10 V/DIV., 100 msec./DIV.
  Ignition switch ON

CHECK ECM (1GR-FE)

Measure the voltage and resistance of the connectors.

Symbols (Terminal No.)
Wiring Color
Terminal Description
Condition
Specified Condition
IMI (E14-16) - E0M (E13-29)
Y-G - W-B
Transponder key ECU input signal
Ignition switch OFF
Below 1 V
Ignition switch ON
Pulse generation (see waveform 1)
IMO (E14-15) - E0M (E13-29)
Y-B -W-B
Transponder key ECU output signal
Ignition switch OFF
Below 1 V
Ignition switch ON
Pulse generation (see waveform 2)
E01 (E16-7) - Body ground
W-B - Body ground
Ground
Always
Below 1 Ω
E02 (E16-6) - Body ground
W-B - Body ground
Ground
Always
Below 1 Ω
EC (E13-22) - Body ground
R - Body ground
Ground
Always
Below 1 Ω

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

Inspect using an oscilloscope.
1. Waveform 1 (Reference)
  Symbols (Terminal No.)
  Tool Setting
  Condition
  IMI (E14-16) - E0M (E13-29)
  10 V/DIV., 100 msec./DIV.
  Ignition switch ON
2. Waveform 2 (Reference)
  Symbols (Terminal No.)
  Tool Setting
  Condition
  IMO (E14-15) - E0M (E13-29))
  10 V/DIV., 100 msec./DIV.
  Ignition switch ON

CHECK ECM (1KD-FTV)

Measure the voltage and resistance of the connectors.

Symbols (Terminal No.)
Wiring Color
Terminal Description
Condition
Specified Condition
IMI (E6-30) - E0M (E5-16)
Y-G - W-B
Transponder key ECU input signal
Ignition switch OFF
Below 1 V
Ignition switch ON
Pulse generation (see waveform 1)
IMO (E6-29) - E0M (E5-16)
Y-B -W-B
Transponder key ECU output signal
Ignition switch OFF
Below 1 V
Ignition switch ON
Pulse generation (see waveform 2)
E01 (E8-7) - Body ground
W-B - Body ground
Ground
Always
Below 1 Ω
E02 (E8-6) - Body ground
W - Body ground
Ground
Always
Below 1 Ω
E1 (E7-7) - Body ground
BR - Body ground
Ground
Always
Below 1 Ω

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

Inspect using an oscilloscope.
1. Waveform 1 (Reference)
  Symbols (Terminal No.)
  Tool Setting
  Condition
  IMI (E6-30) - E0M (E5-16)
  10 V/DIV., 100 msec./DIV.
  Ignition switch ON
2. Waveform 2 (Reference)
  Symbols (Terminal No.)
  Tool Setting
  Condition
  IMI (E7-30) - E0M (E6-16)
  10 V/DIV., 100 msec./DIV.
  Ignition switch ON

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
GND (T20-7) - Body ground	L-O - Body ground	Ground	Always	Below 1 Ω

Symbols (Terminal No.)	Tool Setting	Condition
CODE (T20-4) - GND (T20-7)	2 V/DIV., 20 msec./DIV.	Key inserted