Terminals Of Ecu

WARNING: This page is about a different car, the 2004 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.

CHECK TRANSPONDER KEY AMPLIFIER

Fig 1: Identifying Transponder Key Amplifier
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1. Disconnect the T8 amplifier connector.
2. Measure the resistance between the terminal of the wire harness side connector and body ground.
  Standard:
  
  Fig 2: Measuring Resistance Between Terminal Of Wire Harness Side Connector And Body Ground
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the result is not as specified, there may be a malfunction on the wire harness side.
3. Reconnect the T8 amplifier connector.
4. Measure the voltage and resistance between each terminal of the connector and body ground.
  Standard:
  
  Fig 3: Measuring Voltage And Resistance Between Each Terminal Of Connector And Body Ground
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the result is not as specified, the amplifier may have a malfunction.
5. Inspect using an oscilloscope.
  Waveform 1 (Reference):
  
  Fig 4: Identifying Waveform 1
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  Fig 5: Terminal Specification
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Waveform 2 (Reference):

Fig 6: Identifying Waveform 2 Graph
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Fig 7: Terminal Specification
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Waveform 3 (Reference):

Fig 8: Identifying Waveform 3
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Fig 9: Checking Steering Lock ECU
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CHECK STEERING LOCK ECU

Fig 10: Checking Steering Lock ECU
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1. Disconnect the S46 ECU connector.
2. Measure the voltage and resistance between each terminal of the wire harness side connector and body ground.
  Standard:
  
  Fig 11: Disconnecting S46 ECU Connector
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  If the result is not as specified, there may be a malfunction on the wire harness side.
3. Reconnect the S46 ECU connector.
4. Measure the voltage between each terminal of the connector
  Standard:
  
  Fig 12: Measuring Voltage Between Each Terminal Of Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the result is not as specified, the ECU may have a malfunction.
5. Inspect using an oscilloscope.
  Waveform 1 (Reference):
  
  Fig 13: Inspecting Using An Oscilloscope
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  Fig 14: Identifying Waveform 1
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  Waveform 2 (Reference):
  
  Fig 15: Identifying Waveform 2
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  Fig 16: Identifying Waveform 3
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  Waveform 3 (Reference):
  
  Fig 17: Identifying Waveform 4
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  Fig 18: Identifying Gnd Graph
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  Waveform 4 (Reference):
  
  Fig 19: Identifying Waveform 4
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  Fig 20: Identifying Gnd Graph
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  Waveform 5 (Reference):
  
  Fig 21: Identifying Waveform 5
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  Fig 22: Identifying Gnd Graph
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CHECK ECM

Fig 23: Checking ECM
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1. Disconnect the E2 and E4 ECM connectors.
2. Measure the voltage and resistance between each terminal of the wire harness side connectors and body ground.
  Standard:
  
  Fig 24: Measuring Voltage And Resistance Between Each Terminal
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the result is not as specified, there may be a malfunction on the wire harness side.
3. Inspect using an oscilloscope.
  Waveform 1 (Reference):
  
  Fig 25: Identifying Waveform 1 Table
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  Fig 26: Identifying Oscilloscope Graph
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  Waveform 2 (Reference):
  
  Fig 27: Identifying Waveform 2 Table
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  Fig 28: Identifying Oscilloscope Graph
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