GSIC - Global Service Information Center

# ENGINE IMMOBILISER SYSTEM > TERMINALS OF ECU

CHECK TRANSPONDER KEY AMPLIFIER

1. Disconnect the T20 amplifier connector.

2. 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.

3. Reconnect the T20 amplifier connector.

4. 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)

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

5. 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

1. Disconnect the T21 ECU connector.

2. 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

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

3. Reconnect the T21 ECU connector.

4. 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)

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

5. 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)

1. 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

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

2. 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)

1. 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

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

2. 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)

1. 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

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

2. 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