Engine Immobiliser System (W/O Entry And Start System) -- Terminals Of Ecu |
CHECK TRANSPONDER KEY AMPLIFIER |

Disconnect the E8 amplifier connector.
Measure the resistance of the wire harness side connector.
If the result is not as specified, there may be a malfunction in the wire harness.Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition AGND (E8-7) - Body ground R - Body ground Ground Always Below 1 Ω Reconnect the E8 amplifier connector.
Measure the resistance and voltage of the connector.
If the result is not as specified, there may be a malfunction in the amplifier.Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition AGND (E8-7) - Body ground R - Body ground Ground Always Below 1 Ω VC5 (E8-1) - AGND (E8-7) B - R Power source No key is in ignition key cylinder Below 1 V Key inserted 4.6 to 5.4 V CODE (E8-4) - AGND (E8-7) P - R Demodulated signal of key code data No key is in ignition key cylinder Below 1 V Key inserted Pulse generation (see waveform 1) TXCT (E8-5) - AGND (E8-7) G - R Key code output signal No key is in ignition key cylinder Below 1 V Key inserted Pulse generation (see waveform 2) Using an oscilloscope, check the waveform 1.
Waveform 1 (Reference): Item Content Symbols (Terminal No.) CODE (E8-4) - AGND (E8-7) Tool Setting 5 V/DIV., 20 msec./DIV. Condition Key inserted Using an oscilloscope, check the waveform 2.
Waveform 2 (Reference): Item Content Symbols (Terminal No.) TXCT (E8-5) - AGND (E8-7) Tool Setting 5 V/DIV., 20 msec./DIV. Condition Key inserted
![]() |
![]() |
CHECK TRANSPONDER KEY ECU |

Disconnect the E50 ECU connector.
Measure the voltage and resistance of the wire harness side connector.
If the result is not as specified, there may be a malfunction on the wire harness side.Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition GND (E50-16) - Body ground W-B - Body ground Ground Always Below 1 Ω +B (E50-1) - GND (E50-16) R - W-B Battery Always 11 to 14 V IG (E50-2) - GND (E50-16) B - W-B Ignition switch Ignition switch off Below 1 V Ignition switch ON 11 to 14 V Reconnect the E50 ECU connector.
Measure the resistance and voltage of the connector.
If the result is not as specified, there may be a malfunction in the ECU.Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition AGND (E50-5) - GND (E50-16) R - W-B Amplifier ground circuit Always Below 1 Ω KSW (E50-3) - GND (E50-16) L - W-B Unlock warning switch No key is in ignition key cylinder 11 to 14 V Key inserted Below 1 V VC5 (E50-14) - AGND (E50-5) B - R Power source No key is in ignition key cylinder Below 1 V Key inserted 4.6 to 5.4 V TXCT (E50-4) - AGND (E50-5) G - R Transponder key amplifier communication signal No key is in ignition key cylinder Below 1 V Key inserted Pulse generation (see waveform 1) CODE (E50-15) - AGND (E50-5) P - R Transponder key amplifier communication signal No key is in ignition key cylinder Below 1 V Key inserted Pulse generation (see waveform 2) EFIO (E50-13) - GND (E50-16) P - W-B ECM output signal Ignition switch off Below 1 V Ignition switch ON Pulse generation (see waveform 3) EFII (E50-12) - GND (E50-16) LG - W-B ECM input signal Ignition switch off Below 1 V Ignition switch ON Pulse generation (see waveform 4) IND (E50-8)- GND (E50-16) Y - W-B Security indicator light signal Engine immobiliser system SET Alternating between 11 to 14 V and below 1 V Engine immobiliser system UNSET Below 1 V D (E50-9) - GND (E50-16) W - W-B Diagnosis tester communication Ignition switch ON Pulse generation Using an oscilloscope, check the waveform 1.
Waveform 1 (Reference): Item Content Symbols (Terminal No.) TXCT (E50-4) - AGND (E50-5) Tool Setting 5 V/DIV., 20 msec./DIV. Condition Key inserted Using an oscilloscope, check the waveform 2.
Waveform 2 (Reference): Item Content Symbols (Terminal No.) CODE (E50-15) - AGND (E50-5) Tool Setting 5 V/DIV., 20 msec./DIV. Condition Key inserted Using an oscilloscope, check the waveform 3.
Waveform 3 (Reference): Item Content Symbols (Terminal No.) EFIO (E50-13) - GND (E50-16) Tool Setting 10 V/DIV., 100 msec./DIV. Condition Ignition switch ON Using an oscilloscope, check the waveform 4.
Waveform 4 (Reference): Item Content Symbols (Terminal No.) EFII (E50-12) - GND (E50-16) Tool Setting 10 V/DIV., 100 msec./DIV. Condition Ignition switch ON
![]() |
![]() |
![]() |
![]() |
CHECK ECM |

Measure the resistance and voltage of the wire harness side connector.
If the result is not as specified, there may be a malfunction in the wire harness.Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition IMI (A12-11) - Body ground P - Body ground Transponder key ECU input signal Ignition switch off Below 1 V Ignition switch ON Pulse generation (see waveform 1) IMO (A12-10) - Body ground LG - Body ground Transponder key ECU output signal Ignition switch off Below 1 V Ignition switch ON Pulse generation (see waveform 2) Using an oscilloscope, check the waveform 1.
Waveform 1 (Reference): Item Content Symbols (Terminal No.) IMI (A12-11) - Body ground Tool Setting 10 V/DIV., 100 msec./DIV. Condition Ignition switch ON Using an oscilloscope, check the waveform 2.
Waveform 2 (Reference): Item Content Symbols (Terminal No.) IMO (A12-10) - Body ground Tool Setting 10 V/DIV., 100 msec./DIV. Condition Ignition switch ON
![]() |
![]() |