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Terminals Of Ecu

  1. TCM 
    Fig 1: Identifying B51 Connector Terminals
    G05405711Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    Each TCM terminal's standard voltage is shown in the table below.

    In the table, first follow the information under "Condition". Look under "Terminals No. (Symbols)" for the terminals to be inspected. The standard voltage between the terminals is shown under "Specified Condition". Use the illustration above as a reference for the TCM terminals.

    VOLTAGE SPECIFICATION

    Terminals No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
    B51-15 (R) - B51-8 (E1) W - B R shift position switch signal IG switch ON (IG) and shift lever in R position 11 to 14 V
    IG switch ON (IG) and shift lever except R position Below 1 V
    B51-16 (D) - B51-8 (E1) R - B D shift position switch signal IG switch ON (IG) and shift lever in D and S position 11 to 14 V
    IG switch ON (IG) and shift lever except D and S position Below 1 V
    B51-12 (STP) - B51-8 (E1) B - B Stop light switch signal Brake pedal is depressed 7.5 to 14 V
    Brake pedal is released Below 1.5 V
    B51-11 (NSW) - B51-8 (E1) L - B Park/neutral switch signal IG switch ON (IG) and shift lever in P or N position Below 2 V
    IG switch ON (IG) and shift lever except P or N position 11 to 14 V
    B51-10 (STA) - B51-8 (E1) Y - B Starter signal Cranking (shift lever position in P or N position, ignition switch START) 11 to 14 V
    IG switch ON (IG) and shift lever except P or N position Below 2 V
    B51-3 (SPD) - B51-8 (E1) BR - B Speed signal from combination meter Vehicle speed 12 mph (20 km/h) Pulse generation (See  awaveform 1)
    B51-1 (BATT) - B51-8 (E1) W-L - B Battery (for measuring battery voltage and for TCM memory) Always 9 to 14 V
    B51-13 (IGSW) - B51-8 (E1) L-B - B Ignition switch Ignition switch ON (IG) 9 to 14 V
    B51-18 (+B) - B51-8 (E1) G - B Power source of TCM Ignition switch ON (IG) 9 to 14 V
    B51-6 (CAN+) - B51-8 (E1) B - B CAN communication line Ignition switch ON (IG) Pulse generation (See  bwaveform 2)
    B51-7 (CAN-) - B51-8 (E1) Y - B CAN communication line Ignition switch ON (IG) Pulse generation (See  cwaveform 3)
    1. Waveform 1

      Reference: 

      WAVEFORM REFERENCE

      Terminal SPD - E1
      Tool setting 2 V/DIV., 20 ms./DIV.
      Vehicle condition Vehicle speed 12 mph (20 km/h)
      Fig 2: Identifying Waveform 1
      G04976529Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Waveform 2

      Reference: 

      WAVEFORM REFERENCE

      Terminal CAN+ - E1
      Tool setting 1 V/DIV., 10 ms./DIV.
      Vehicle condition Engine is stopped, ignition ON (IG)
      Fig 3: Identifying Waveform 2
      G04948288Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Waveform 3

      Reference: 

      WAVEFORM REFERENCE

      Terminal CAN- - E1
      Tool setting 1 V/DIV., 10 ms./DIV.
      Vehicle condition Engine is stopped, ignition ON (IG)
  2. ECM 

    HINT:

    Each ECM terminal's standard voltage is shown in the table below.

    In the table, first follow the information under "Condition". Look under "Terminals No. (Symbols)" for the terminals to be inspected. The standard voltage between the terminals is shown under "Specified Condition". Use the illustration below as a reference for the ECM terminals.

    Fig 4: Identifying Waveform 3
    G04948289Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 5: Identifying B50 And A55 Connector Terminals
    G05405715Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    VOLTAGE SPECIFICATION

    Terminals No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
    A55-25 (S) - B50-81 (E1) Y - W-B S shift position switch signal IG switch ON (IG) and shift lever in S position 11 to 14 V
    IG switch ON (IG) and shift lever except S position Below 1 V
    A55-16 (SFTU) - B50-81 (E1) R - W-B Up shift switch signal IG switch ON (IG) and shift lever in S position 11 to 14 V
    IG switch ON (IG) and shift lever in "+" position (Up shift) Below 1 V
    A55-51 (SFTD) - B50-81 (E1) L - W-B Down shift switch signal IG switch ON (IG) and shift lever in S position 11 to 14 V
    IG switch ON (IG) and shift lever in "-" position (Down shift) Below 1 V
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