Terminals Of Ecu

WARNING: This page is about a different car, the 2004 Lexus ES 330. However, it is still accessible from the selected car via links, so may be relevant.

CHECK TRANSPONDER KEY AMPLIFIER

Fig 1: Checking Transponder Key Amplifier
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. Disconnect the T13 amplifier connector, and 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 & Body Ground Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the result is not as specified, there may be a malfunction on the wire harness side.
2. Reconnect the T13 amplifier connector, and measure the resistance and voltage of each terminal of the connector.
  Standard
  
  Fig 3: Measuring Resistance & Voltage Of Each Terminal Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the result is not as specified, the amplifier may have a malfunction.
3. Inspect using an oscilloscope.
  Waveform 1 (Reference):
  
  Fig 4: Identifying Waveform 1 (Reference) Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 5: Blinking Diagram Of Waveform 1 (Reference)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Waveform 2 (Reference):
  
  Fig 6: Identifying Waveform 2 (Reference) Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 7: Blinking Diagram Of Waveform 2 (Reference)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
CHECK TRANSPONDER KEY ECU ASSY

Fig 8: Checking Transponder Key ECU Assy
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. Disconnect the T20 ECU connector, and measure the voltage and resistance between each terminal of the wire harness side connector.
  Standard
  
  Fig 9: Measuring Voltage & Resistance Between Each Terminal Chart (T20 ECU Connector Disconnected)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the result is not as specified, there may be a malfunction on the wire harness side.
2. Reconnect the T20 ECU connector, and measure the voltage between each terminal of the connector.
  Standard
  
  Fig 10: Measuring Voltage Between Each Terminal (T20 ECU Connector Reconnected)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the result is not as specified, the ECU may have a malfunction.
3. Inspect using an oscilloscope.
  Waveform 1 (Reference):
  
  Fig 11: Identifying Waveform 1 (Reference) Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 12: Blinking Diagram Of Waveform 1 (Reference)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Waveform 2 (Reference):
  
  Fig 13: Identifying Waveform 2 (Reference) Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 14: Blinking Diagram Of Waveform 2 (Reference)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Waveform 3 (Reference):
  
  Fig 15: Identifying Waveform 3 (Reference) Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 16: Blinking Diagram Of Waveform 3 (Reference)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Waveform 4 (Reference):
  
  Fig 17: Identifying Waveform 4 (Reference) Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 18: Blinking Diagram Of Waveform 4 (Reference)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
CHECK ECM

Fig 19: Checking ECM
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. Disconnect the E7 and E8 ECM connectors, and measure the voltage and resistance between each terminal of the wire harness side connectors.
  Standard
  
  Fig 20: Measuring Voltage & Resistance Between Each Terminals (E7 & E8 ECM Disconnected) Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the result is not as specified, there may be a malfunction on the wire harness side.
2. Inspect using an oscilloscope.
  Waveform 1 (Reference):
  
  Fig 21: Identifying Waveform 1 (Reference) Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 22: Blinking Diagram Of Waveform 1 (Reference)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Waveform 2 (Reference):
  
  Fig 23: Identifying Waveform 2 (Reference) Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 24: Blinking Diagram Of Waveform 2 (Reference)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002