Engine immobiliser
Terminals of ecu
In this manual: Engine immobiliser
8steps
~48min
2/5difficulty
Done 0 of 8
- Check transponder key amplifier

- Disconnect the e5 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.
- Reconnect the e5 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.
- Using an oscilloscope, check the waveform 1.


- Using an oscilloscope, check the waveform 2.
- Check transponder key ecu

- Disconnect the e46 ecu connector.
- Measure the resistance and voltage of the wire harness side connector.

If the result is not as specified, there may be a malfunction on the wire harness side.
- Reconnect the e46 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.
- Using an oscilloscope, check the waveform 1.

- Using an oscilloscope, check the waveform 2.

- Using an oscilloscope, check the waveform 3.

- Using an oscilloscope, check the waveform 4.

- 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.
- Using an oscilloscope, check the waveform 1.

- Using an oscilloscope, check the waveform 2.

Test yourself
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