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Terminals Of Ecu

  1. CHECK ECM 
    Fig 1: Identifying E1 To E6 ECU Connector Terminals
    G05289525Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage of the ECM connector.

      HINT:

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

      In the table, first follow the information under "Condition". Look under "Symbols (Terminal No.)" 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 ECM terminals.

      ECU CONNECTOR TERMINALS SPECIFIED CONDITION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      NSW (E3-4) - E1 (E3-7) L-Y - BR Park neutral switch signal Ignition switch ON and shift lever on P or N Below 1 V
      NSW (E3-4) - E1 (E3-7) L-Y - BR Park neutral switch signal Ignition switch ON and shift lever not on P or N 10 to 14 V
      P (E3-6) - E1 (E3-7) W - BR Park position switch signal Ignition switch ON and shift lever on P 10 to 14 V
      P (E3-6) - E1 (E3-7) W - BR Park position switch signal Ignition switch ON and shift lever not on P Below 1 V
      R (E3-8) - E1 (E3-7) G - BR R shift position switch signal Ignition switch ON and shift lever on R 10 to 14 V
      R (E3-8) - E1 (E3-7) G - BR R shift position switch signal Ignition switch ON and shift lever not on R Below 1 V
      N (E3-32) - E1 (E3-7) G-R - BR Neutral position switch signal Ignition switch ON and shift lever on N 10 to 14 V
      N (E3-32) - E1 (E3-7) G-R - BR Neutral position switch signal Ignition switch ON and shift lever not on N Below 1 V
      D (E3-9) - E1 (E3-7) G-Y - BR D shift position switch signal Ignition switch ON and shift lever on D or S 10 to 14 V
      D (E3-9) - E1 (E3-7) G-Y - BR D shift position switch signal Ignition switch ON and shift lever not on D or S Below 1 V
      S (E5-9) - E1 (E3-7) G-B - BR S shift position switch signal Ignition switch ON and shift lever on S 10 to 14 V
      S (E5-9) - E1 (E3-7) G-B - BR S shift position switch signal Ignition switch ON and shift lever not on S Below 1 V
      SFTU (E5-30) - E1 (E3-7) L-Y - BR Up-shift switch signal Ignition switch ON and shift lever on S 10 to 14 V
      SFTU (E5-30) - E1 (E3-7) L-Y - BR Up-shift switch signal Ignition switch ON and shift lever "+" position (upshift) Below 1 V
      SFTD (E5-19) - E1 (E3-7) Y - BR Down-shift switch signal Ignition switch ON and shift lever on S 10 to 14 V
      SFTD (E5-19) - E1 (E3-7) Y - BR Down-shift switch signal Ignition switch ON and shift lever "-" position (down-shift) Below 1 V
      STP (E5-4) - E1 (E3-7) G-R - BR Stop light switch signal Brake pedal is depressed 7.5 to 14 V
      STP (E5-4) - E1 (E3-7) G-R - BR Stop light switch signal Brake pedal is released Below 1.5 V
      OIL (E3-27) - EOIL (E3-26) G-Y - BR ATF temperature sensor signal ATF temperature 115°C (239°F) or more Below 1.5 V
      NT+ (E3-21) - NT- (E3-20) Y - L Speed sensor NT signal Engine idle speed (shift lever on P or N) Pulse generation (see  b waveform 1)
      SP2+ (E3-23) - SP2- (E3-22) G - R Speed sensor SP2 signal Vehicle speed 20 km/h (12 mph) Pulse generation (see  c waveform 2)
      S1 (E3-19) - E1 (E3-7) G-R - BR S1 solenoid signal 1st gear Below 1 V
      S1 (E3-19) - E1 (E3-7) G-R - BR S1 solenoid signal Not on 1st gear 10 to 14 V
      S2 (E3-18) - E1 (E3-7) L-R - BR S2 solenoid signal 1st, 2nd or 6th gear 10 to 14 V
      S2 (E3-18) - E1 (E3-7) L-R - BR S2 solenoid signal 3rd, 4th or 5th gear Below 1 V
      S3 (E3-17) - E1 (E3-7) R - BR S3 solenoid signal 1st, 2nd or 3rd gear 10 to 14 V
      S3 (E3-17) - E1 (E3-7) R - BR S3 solenoid signal 4th, 5th or 6th gear Below 1 V
      S4 (E3-16) - E1 (E3-7) W - BR S4 solenoid signal 5th or 6th gear 10 to 14 V
      S4 (E3-16) - E1 (E3-7) W - BR S4 solenoid signal 1st, 2nd, 3rd or 4th gear Below 1 V
      SR (E3-2) - E1 (E3-7) G - BR SR solenoid signal 1st, 2nd, 3rd or 4th gear 10 to 14 V
      SR (E3-2) - E1 (E3-7) G - BR SR solenoid signal 5th or 6th gear Below 1 V
      SL1+ (E3-25) - SL1- (E3-24) R-W - L SL1 solenoid signal 5th or 6th gear Pulse generation (see  d waveform 3)
      SL2+ (E3-11) - SL2- (E3-10) Y-G - Y SL2 solenoid signal Engine idle speed Pulse generation (see  e waveform 4)
      SLT+ (E3-35) - SLT- (E3-34) B-G - B SLT solenoid signal Engine idle speed Pulse generation (see  f waveform 5)
      SLU+ (E3-13) - SLU- (E3-12) L-Y - B-W SLU solenoid signal 5th (lock up) or 6th (lockup) gear Pulse generation (see  g waveform 6)
    2. Using an oscilloscope, check the waveform 1.

      Waveform 1 (Reference) 

      WAVEFORM REFERENCE CHART

      Item Content
      Symbols (Terminal No.) NT+ (E3-21) - NT- (E3-20)
      Tool Setting 1 V/DIV., 2 msec./DIV.
      Condition Engine idle speed (shift lever on P or N)
      Fig 2: Identifying Oscilloscope Waveform Graph 1
      G05289526Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Using an oscilloscope, check the waveform 2.

      Waveform 2 (Reference) 

      WAVEFORM REFERENCE CHART

      Item Content
      Symbols (Terminal No.) SP2+ (E3-23) - SP2- (E3-22)
      Tool Setting 2 V/DIV., 2 msec./DIV.
      Condition Vehicle speed 20 km/h (12 mph)
      Fig 3: Identifying Oscilloscope Waveform Graph 2
      G05289527Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Using an oscilloscope, check the waveform 3.

      Waveform 3 (Reference) 

      WAVEFORM REFERENCE CHART

      Item Content
      Symbols (Terminal No.) SL1+ (E3-25) - SL1- (E3-24)
      Tool Setting 5 V/DIV., 1 msec./DIV.
      Condition 5th or 6th gear
      Fig 4: Identifying Oscilloscope Waveform Graph 3
      G05289528Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Using an oscilloscope, check the waveform 4.

      Waveform 4 (Reference) 

      WAVEFORM REFERENCE CHART

      Item Content
      Symbols (Terminal No.) SL2+ (E3-11) - SL2- (E3-10)
      Tool Setting 5 V/DIV., 1 msec./DIV.
      Condition Engine idle speed
      Fig 5: Identifying Oscilloscope Waveform Graph 4
      G05289529Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Using an oscilloscope, check the waveform 5.

      Waveform 5 (Reference) 

      WAVEFORM REFERENCE CHART

      Item Content
      Symbols (Terminal No.) SLT+ (E3-35) - SLT- (E3-34)
      Tool Setting 5 V/DIV., 1 msec./DIV.
      Condition Engine idle speed
      Fig 6: Identifying Oscilloscope Waveform Graph 5
      G05289530Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    7. Using an oscilloscope, check the waveform 6.

      Waveform 6 (Reference) 

      WAVEFORM REFERENCE CHART

      Item Content
      Symbols (Terminal No.) SLU+ (E3-13) - SLU- (E3-12)
      Tool Setting 5 V/DIV., 1 msec./DIV.
      Condition 5th (lock up) or 6th (lock up) gear
      Fig 7: Identifying Oscilloscope Waveform Graph 6
      G05289531Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. CHECK PASSENGER SIDE JUNCTION BLOCK (PASSENGER SIDE JUNCTION BLOCK ECU) 
    Fig 8: Identifying P4 Passenger Side Junction Block Connector Terminals
    G05289532Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage of the ECU connector.

      HINT.

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

      In the table, first follow the information under "Condition". Look under "Symbols (Terminal No.)" for the terminals to inspected. The standard voltage between the terminals is shown under "Specified Condition".

      Use the illustration above as a reference for the ECU terminals.

      ECU CONNECTOR TERMINALS SPECIFIED CONDITION

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      PWR (P4-18) - Body ground GR-L PWR switch signal Ignition switch ON and pattern select switch (PWR) ON 0 to 1.5 V
      PWR (P4-18) - Body ground GR-L PWR switch signal Ignition switch ON and pattern select switch (PWR) OFF Pulse generation*
      SNOW (P4-17) - Body ground L-R SNOW switch signal Ignition switch ON and pattern select switch (SNOW) ON 0 to 1.5 V
      SNOW (P4-17) - Body ground L-R SNOW switch signal Ignition switch ON and pattern select switch (SNOW) OFF Pulse generation*
      HINT:
      *: Voltage is input intermittently as this is an intermittent circuit. (Voltage varies between a peak of 7.5 to 14 V and a low of 0 to 1.5 V.)
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