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Terminals Of ECM

  1. CHECK ECM 
    Fig 1: Identifying ECM Terminals
    GTY138377Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT: 

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

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

    Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
    A38-21 (L4) - C53-81 (E1) BR-R - W-B Transfer L4 position signal
    • Engine switch on (IG)
    • Transfer position switch on L4
    		 Below 1.5 V
    A38-21 (L4) - C53-81 (E1) BR-R - W-B Transfer L4 position signal
    • Engine switch on (IG)
    • Transfer position switch not on L4
    		 11 to 14 V
    A38-5 (TFN) - C53-81 (E1) G - W-B Transfer neutral position signal
    • Engine switch on (IG)
    • Transfer position in neutral
    		 Below 1.5 V
    A38-5 (TFN) - C53-81 (E1) G - W-B Transfer neutral position signal
    • Engine switch on (IG)
    • Transfer position not in neutral
    		 11 to 14 V
    C53-120 (NSW) - C53-81 (E1) L - W-B PNP switch signal
    • Engine switch on (IG)
    • Shift lever in P or N
    		 Below 1 V
    C53-120 (NSW) - C53-81 (E1) L - W-B PNP switch signal
    • Engine switch on (IG)
    • Shift lever not in P or N
    		 11 to 14 V
    C53-2 (P) - C53-81 (E1) G-B - W-B P shift position switch signal
    • Engine switch on (IG)
    • Shift lever in P
    		 11 to 14 V
    C53-2 (P) - C53-81 (E1) G-B - W-B P shift position switch signal
    • Engine switch on (IG)
    • Shift lever not in P
    		 Below 1 V
    C53-26 (R) - C53-81 (E1) L-R - W-B R shift position switch signal
    • Engine switch on (IG)
    • Shift lever in R
    		 11 to 14 V
    C53-26 (R) - C53-81 (E1) L-R - W-B R shift position switch signal
    • Engine switch on (IG)
    • Shift lever not in R
    		 Below 1 V
    C53-25 (N) - C53-81 (E1) G-W - W-B N shift position switch signal
    • Engine switch on (IG)
    • Shift lever in N
    		 11 to 14 V
    C53-25 (N) - C53-81 (E1) G-W - W-B N shift position switch signal
    • Engine switch on (IG)
    • Shift lever not in N
    		 Below 1 V
    C53-27 (D) - C53-81 (E1) G - W-B D shift position switch signal
    • Engine switch on (IG)
    • Shift lever in D
    		 11 to 14 V
    C53-27 (D) - C53-81 (E1) G - W-B D shift position switch signal
    • Engine switch on (IG)
    • Shift lever not in D
    		 Below 1 V
    A38-25 (S) - C53-81 (E1) W - W-B S shift position switch signal
    • Engine switch on (IG)
    • Shift lever in S
    		 11 to 14 V
    A38-25 (S) - C53-81 (E1) W - W-B S shift position switch signal
    • Engine switch on (IG)
    • Shift lever not in S
    		 Below 1 V
    A38-38 (SFTU) - C53-81 (E1) Y - W-B Up-shift position switch signal
    • Engine switch on (IG)
    • Shift lever in S
    		 11 to 14 V
    A38-38 (SFTU) - C53-81 (E1) Y - W-B Up-shift position switch signal
    • Engine switch on (IG)
    • Shift lever "+" position (up-shift)
    		 Below 1 V
    A38-27 (SFTD) - C53-81 (E1) L - W-B Down-shift position switch signal
    • Engine switch on (IG)
    • Shift lever in S
    		 11 to 14 V
    A38-27 (SFTD) - C53-81 (E1) L - W-B Down-shift position switch signal
    • Engine switch on (IG)
    • Shift lever "-" position (down-shift)
    		 Below 1 V
    A38-36 (STP) - C53-81 (E1) R - W-B Stop light switch signal Brake pedal depressed 11 to 14 V
    A38-36 (STP) - C53-81 (E1) R - W-B Stop light switch signal Brake pedal released Below 1.5 V
    C53-7 (S1) - C53-81 (E1) R - W-B Shift solenoid valve S1 signal 1st gear Below 1 V
    C53-7 (S1) - C53-81 (E1) R - W-B Shift solenoid valve S1 signal Not in 1st gear 11 to 14 V
    C53-6 (S2) - C53-81 (E1) W - W-B Shift solenoid valve S2 signal 1st, 2nd or 6th gear 11 to 14 V
    C53-6 (S2) - C53-81 (E1) W - W-B Shift solenoid valve S2 signal 3rd, 4th or 5th gear Below 1 V
    C53-3 (S3) - C53-81 (E1) B-R - W-B Shift solenoid valve S3 signal 1st, 2nd or 3rd gear 11 to 14 V
    C53-3 (S3) - C53-81 (E1) B-R - W-B Shift solenoid valve S3 signal 4th, 5th or 6th gear Below 1 V
    C53-5 (S4) - C53-81 (E1) G-R - W-B Shift solenoid valve S4 signal 5th or 6th gear 11 to 14 V
    C53-5 (S4) - C53-81 (E1) G-R - W-B Shift solenoid valve S4 signal 1st, 2nd, 3rd or 4th gear Below 1 V
    C53-4 (SR) - C53-81 (E1) G - W-B Shift solenoid valve SR signal 1st, 2nd, 3rd or 4th gear 11 to 14 V
    C53-4 (SR) - C53-81 (E1) G - W-B Shift solenoid valve SR signal 5th or 6th gear Below 1 V
    C53-14 (SL1+) - C53-15 (SL1-) Y - L Shift solenoid valve SL1 signal 5th or 6th gear Pulse generation
    (see waveform 1)
    C53-12 (SL2+) - C53-13 (SL2-) G-R - L-W Shift solenoid valve SL2 signal Engine idling Pulse generation
    (see waveform 2)
    C53-9 (SLT+) - C53-8 (SLT-) B - G-B Shift solenoid valve SLT signal Engine idling Pulse generation
    (see waveform 3)
    C53-10 (SLU+) - C53-11 (SLU-) L-Y - L-R Shift solenoid valve SLU signal 5th (lock-up) gear or 6th (lock-up) gear Pulse generation
    (see waveform 4)
    C53-122 (THO1) - C53-98 (ETHA) G-Y - BR No. 1 ATF temperature sensor signal No. 1 ATF temperature: 115°C (239°F) or higher Below 1.5 V
    C53-99 (THO2) - C53-98 (ETHA) L - BR No. 2 ATF temperature sensor signal No. 2 ATF temperature: 115°C (239°F) or higher Below 1.5 V
    C53-101 (SP2+) - C53-100 (SP2-) Y - B Speed sensor SP2 signal Vehicle speed 20 km/h (12 mph) Pulse generation
    (see waveform 5)
    C53-124 (NT+) - C53-123 (NT-) Y - B Speed sensor NT signal Engine idling
    (shift lever in P or N)    		 Pulse generation
    (see waveform 6)
    A38-10 (CANH) - C53-81 (E1) P - W-B CAN communication line Engine switch on (IG) Pulse generation
    (see waveform 7)
    A38-11 (CANL) - C53-81 (E1) B - W-B CAN communication line Engine switch on (IG) Pulse generation
    (see waveform 8)
    A38-51 (PWR) - C53-81 (E1) L-B - W-B Pattern select switch (PWR) signal
    • Engine switch on (IG)
    • Pattern select switch (PWR) off
    		 11 to 14 V
    A38-51 (PWR) - C53-81 (E1) L-B - W-B Pattern select switch (PWR) signal
    • Engine switch on (IG)
    • Pattern select switch (PWR) on
    		 Below 1.5 V
    A38-4 (SNWI) - C53-81 (E1) R - W-B Pattern select switch (2ND) signal
    • Engine switch on (IG)
    • Pattern select switch (2ND) off
    		 11 to 14 V
    A38-4 (SNWI) - C53-81 (E1) R - W-B Pattern select switch (2ND) signal
    • Engine switch on (IG)
    • Pattern select switch (2ND) pressed and held
    		 Below 1.5 V
    1. Using an oscilloscope, check waveform 1.
      Fig 2: ECM Connector Waveform Graph
      GTY125182Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      REFERENCE:

      Terminal No. (Symbol) Tool Setting Condition
      C53-14 (SL1+) - C53-15 (SL1-) 5 V/DIV., 1 msec./DIV. Engine idling
    2. Using an oscilloscope, check waveform 2.
      Fig 3: ECM Connector Waveform Graph
      GTY125182Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      REFERENCE:

      Terminal No. (Symbol) Tool Setting Condition
      C53-12 (SL2+) - C53-13 (SL2-) 5 V/DIV., 1 msec./DIV. Engine idling
    3. Using an oscilloscope, check waveform 3.
      Fig 4: ECM Connector Waveform Graph
      GTY125182Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      REFERENCE:

      Terminal No. (Symbol) Tool Setting Condition
      C53-9 (SLT+) - C53-8 (SLT-) 5 V/DIV., 1 msec./DIV. Engine idling
    4. Using an oscilloscope, check waveform 4.
      Fig 5: ECM Connector Waveform Graph
      GTY136107Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      REFERENCE:

      Terminal No. (Symbol) Tool Setting Condition
      C53-10 (SLU+) - C53-11 (SLU-) 5 V/DIV., 1 msec./DIV. 5th (lock-up)
    5. Using an oscilloscope, check waveform 5.
      Fig 6: ECM Connector Waveform Graph
      GTY123185Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      REFERENCE:

      Terminal No. (Symbol) Tool Setting Condition
      C53-101 (SP2+) - C53-100 (SP2-) 2 V/DIV., 2 msec./DIV. Vehicle speed 20 km/h (12 mph)
    6. Using an oscilloscope, check waveform 6.
      Fig 7: ECM Connector Waveform Graph
      GTY109370Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      REFERENCE:

      Terminal No. (Symbol) Tool Setting Condition
      C53-124 (NT+) - C53-123 (NT-) 1 V/DIV., 2 msec./DIV. Engine idling (shift lever in P or N)
    7. Using an oscilloscope, check waveform 7.
      Fig 8: Waveform 7 Reference Graph
      GTY125332Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      REFERENCE:

      Terminal No. (Symbol) Tool Setting Condition
      A38-10 (CANH) - C53-81 (E1) 1 V/DIV., 10 μsec./DIV. Engine switch on (IG)
    8. Using an oscilloscope, check waveform 8.
      Fig 9: Waveform 8 Reference Graph
      GTY122014Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      REFERENCE:

      Terminal No. (Symbol) Tool Setting Condition
      A38-11 (CANL) - C53-81 (E1) 1 V/DIV., 10 μsec./DIV. Engine switch on (IG)
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