LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2008 >> LX 570 >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission >> Automatic Transmission System >> Terminals Of ECM
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Terminals Of ECM

  1. CHECK ECM 
    Fig 1: Identifying ECM Terminals
    G05628946Courtesy 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.

    ECM TERMINAL STANDARD VOLTAGE SPECIFICATION

    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  awaveform 1)
    C53-12 (SL2+) - C53-13 (SL2-) G-R - L-W Shift solenoid valve SL2 signal Engine idling Pulse generation (see  bwaveform 2)
    C53-9 (SLT+) - C53-8 (SLT-) B-G-B Shift solenoid valve SLT signal Engine idling Pulse generation (see  cwaveform 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  dwaveform 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  ewaveform 5)
    C53-124 (NT+) - C53-123 (NT-) Y-B Speed sensor NT signal Engine idling (shift lever in P or N) Pulse generation (see  fwaveform 6)
    A38-10 (CANH) - C53-81 (E1) P - W-B CAN communication line Engine switch on (IG) Pulse generation (see  gwaveform 7)
    A38-11 (CANL) - C53-81 (E1) B - W-B CAN communication line Engine switch on (IG) Pulse generation (see  hwaveform 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.

    Reference: 

    WAVEFORM REFERENCE CHART

    Terminal No. (Symbol) Tool Setting Condition
    C53-14 (SL1+) - C53-15 (SL1-) 5 V/DIV., 1 msec/DIV. Engine idling
    Fig 2: Waveform 1 Reference Graph
    G05628947Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Using an oscilloscope, check waveform 2.

    Reference: 

    WAVEFORM REFERENCE CHART

    Terminal No. (Symbol) Tool Setting Condition
    C53-12 (SL2+) - C53-13 (SL2-) 5 V/DIV., 1 msec/DIV. Engine idling
    Fig 3: Waveform 2 Reference Graph
    G05628947Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Using an oscilloscope, check waveform 3.

    Reference: 

    WAVEFORM REFERENCE CHART

    Terminal No. (Symbol) Tool Setting Condition
    C53-9 (SLT+) - C53-8 (SLT-) 5 V/DIV., 1 msec/DIV. Engine idling
    Fig 4: Waveform 3 Reference Graph
    G05628947Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. Using an oscilloscope, check waveform 4.

    Reference: 

    WAVEFORM REFERENCE CHART

    Terminal No. (Symbol) Tool Setting Condition
    C53-10 (SLU+) - C53-11 (SLU-) 5 V/DIV., 1 msec/DIV. 5th (lock-up)
    Fig 5: Waveform 4 Reference Graph
    G05628950Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. Using an oscilloscope, check waveform 5.

    Reference: 

    WAVEFORM REFERENCE CHART

    Terminal No. (Symbol) Tool Setting Condition
    C53-101 (SP2+) - C53-100 (SP2-) 2 V/DIV., 2 msec/DIV. Vehicle speed 20 km/h (12mph)
    Fig 6: Waveform 5 Reference Graph
    G05628951Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. Using an oscilloscope, check waveform 6.

    Reference: 

    WAVEFORM REFERENCE CHART

    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)
    Fig 7: Waveform 6 Reference Graph
    G05628952Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. Using an oscilloscope, check waveform 7.

    Reference: 

    WAVEFORM REFERENCE CHART

    Terminal No. (Symbol) Tool Setting Condition
    A38-10 (CANH) - C53-81 (E1) 1 V/DIV., 10 usec./DIV. Engine switch on (IG)
    Fig 8: Waveform 7 Reference Graph
    G05628953Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. Using an oscilloscope, check waveform 8.

Reference: 

WAVEFORM REFERENCE CHART

Terminal No. (Symbol) Tool Setting Condition
A38-11 (CANL) - C53-81 (E1) 1 V/DIV., 10 usec/DIV. Engine switch on (IG)
scientia non olet · About LEMON Manuals