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HOMESERVICE MANUALSTOYOTA2009SEQUOIA LIMITED, 5.7 Y, RWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 27 (ENGINE CONTROL SYSTEM (2UZ-FE) - DIAGNOSTIC INTRODUCTION)SFI SYSTEMTERMINALS OF ECM
2009 Toyota Sequoia Limited, 5.7 Y, RWD

Terminals Of ECM

2009 Toyota Sequoia Limited, 5.7 Y, RWDSECTION Terminals Of ECM
WARNING: This page is about a different variant/trim than selected.
  1. CHECK ECM 
    Fig 1: Identifying D56 And A27 ECM Connector Terminals
    G05644829Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage according to the value(s) in the table below.

      HINT:

      The standard normal voltage between each pair of ECM terminals is shown in the table below. The appropriate conditions for checking each pair of terminals are also indicated. The result of checks should be compared with the standard normal voltage for that pair of terminals, displayed in the Specified Condition column. The illustration above can be used as a reference to identify the ECM terminal locations.

      CONNECTOR TERMINAL REFERENCE

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A27-1 (BATT) - D56-81 (E1) L - BR Battery (for measuring battery voltage and for ECM memory) Always 11 to 14 V
      D56-41 (+BM) - D56-81 (E1) P - BR Power source of throttle actuator Always 11 to 14 V
      A27-28 (IG SW) - D56-81 (E1) LG - BR Ignition switch Ignition switch ON 11 to 14 V
      A27-3 (+B) - D56-81 (E1) GR - BR Power source of ECM Ignition switch ON 11 to 14 V
      A27-2 (+B2) - D56-81 (E1) GR - BR Power source of ECM Ignition switch ON 11 to 14 V
      D56-58 (OC1+) - D56-57 (OC1-) B - B-L Camshaft timing oil control valve (OCV) Ignition switch ON Pulse generation (see  b waveform 1)
      D56-52 (OC2+) - D56-51 (OC2-) L-B - R-B Camshaft timing oil control valve (OCV) (Intake side (for bank 2)) Ignition switch ON Pulse generation (see  b waveform 1)
      A27-34 (MREL) - D56-81 (E1) W - BR EFI MAIN relay Ignition switch ON 11 to 14 V
      D56-74 (VG) - D56-75 (E2G) L-Y - G-W Mass air flow meter Idling, Shift lever in P or N, A/C switch OFF 0.5 to 3.0 V
      D56-73 (THA) - D56-97 (ETHW) Y-B - BR Intake air temperature sensor Idling, Intake air temperature 20°C (68°F) 0.5 to 3.4 V
      D56-76 (THW) - D56-97 (ETHW) G-B - BR Engine coolant temperature sensor Idling, Engine coolant temperature 80°C (176°F) 0.2 to 1.0 V
      D56-80 (VCTA) - D56-79 (ETA) L-Y Power source of throttle position sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
      D56-78 (VTA1) - D56-79 (ETA) R-Y - Y Throttle position sensor (for engine control) Ignition switch ON, Throttle valve fully closed 0.5 to 1.2 V
      Ignition switch ON, Throttle valve fully open 3.2 to 4.8 V
      D56-77 (VTA2) - D56-79 (ETA) Y-B - Y Throttle position sensor (for sensor malfunction detection) Ignition switch ON, Throttle valve fully closed 2.1 to 3.1 V
      Ignition switch ON, Throttle valve fully open 4.5 to 5.5 V
      A27-55 (VPA) - A27-58 (EPA) W - BE Accelerator pedal position sensor (for engine control) Ignition switch ON, Accelerator pedal released 0.5 to 1.1 V
      Ignition switch ON, Accelerator pedal fully depressed 2.6 to 4.5 V
      A27-56 (VPA2) - A27-60 (EPA2) LG - BR Accelerator pedal position sensor (for sensor malfunctioning detection) Ignition switch ON, Accelerator pedal released 1.2 to 2.0 V
      Ignition switch ON, Accelerator pedal fully depressed 3.4 to 5.3 V
      A27-57 (VCPA) - A27-58 (EPA) B - BE Power source of accelerator pedal position sensor (for VPA) Ignition switch ON 4.5 to 5.5 V
      A27-59 (VCP2) - A27-60 (EPA2) V - BR Power source of accelerator pedal position sensor (for VPA2) Ignition switch ON 4.5 to 5.5 V
      D56-22 (HA1A) - D56-23 (E04) L - W-B A/F sensor heater Idling Below 3.0 V
      D56-20 (HA2A) - D56-21 (E05) G - W-B Ignition switch ON 11 to 14 V
      D56-126 (A1A+) - D56-81 (E1) G - BR A/F sensor Ignition switch ON 3.3 V*
      D56-125 (A1A-) - D56-81 (E1) R - BR A/F sensor Ignition switch ON 2.9 V*
      D56-103 (A2A+) - D56-81 (E1) P - BR A/F sensor Ignition switch ON 3.3 V*
      D56-102 (A2A-) - D56-81 (E1) L - BR A/F sensor Ignition switch ON 2.9 V*
      D56-45 (HT1B) - D56-46 (E03) G-B - W-B Heated oxygen sensor heater Idling Below 3.0 V
      D56-44 (HT2B) - D56-46 (E03) B - W-B Ignition switch ON 11 to 14 V
      D56-114 (OX1B) - D56-115 (EX1B) W - BR Heated oxygen sensor Engine speed maintained at 2500 RPM for 2 minutes after warming up sensor Pulse generation (see  c waveform 2)
      D56-112 (OX2B) - D56-113 (EX2B) B - BR
      D56-86 (#10) - D56-43 (E01) R-L - W-B Injector Ignition switch ON 11 to 14 V
      D56-109 (#20) - D56-43 (E01) L - W-B
      D56-85 (#30) - D56-43 (E01) R - W-B
      D56-108 (#40) - D56-43 (E01) Y - W-B
      D56-84 (#50) - D56-43 (E01) G - W-B Idling Pulse generation (see  d waveform 3)
      D56-107 (#60) - D56-43 (E01) R - W-B
      D56-83 (#70) - D56-43 (E01) W - W-B
      D56-106 (#80) - D56-43 (E01) R-B - W-B
      D56-94 (KNK1) - D56-93 (EKNK) G - R Knock sensor Engine speed maintained at 4000 RPM after warming up engine Pulse generation (see  e waveform 4)
      D56-117 (KNK2) - D56-116 (EKN2) W - B
      D56-92 (VV1+) - D56-91 (VV1-) R - G Variable valve timing (VVT) sensor (Intake side (for bank 1)) Idling Pulse generation (see  f waveform 5)
      D56-87 (VV2+) - D56-88 (VV2-) R - W Variable valve timing (VVT) sensor (Intake side (for bank 2)) Idling Pulse generation (see  f waveform 5)
      D56-110 (NE+) - D56-111 (NE-) L - G Crankshaft position sensor Idling Pulse generation (see  f waveform 5)
      D56-40 (IGT1) - D56-81 (E1) B-Y - BR Ignition coil (ignition signal) Idling Pulse generation (see  g waveform 6)
      D56-33 (IGT2) - D56-81 (E1) L-Y - BR
      D56-37 (IGT3) - D56-81 (E1) B - BR
      D56-38 (IGT4) - D56-81 (E1) L-B - BR
      D56-35 (IGT5) - D56-81 (E1) G-R - BR
      D56-36 (IGT6) - D56-81 (E1) G - BR
      D56-34 (IGT7) - D56-81 (E1) G-W - BR
      D56-39 (IGT8) - D56-81 (E1) G-B - BR
      D56-104 (IGF1) - D56-81 (E1) G-B - BR Ignition coil (ignition confirmation signal) Ignition switch ON 4.5 to 5.5 V
      Idling Pulse generation (see  g waveform 6)
      D56-105 (IGF2) - D56-81 (E1) R - BR Ignition coil (ignition confirmation signal) Ignition switch ON 4.5 to 5.5 V
      Idling Pulse generation (see  g waveform 6)
      D56-63 (PRG) - D56-81 (E1) L-B - BR Purge VSV Ignition switch ON 11 to 14 V
      Idling Pulse generation (see  h waveform 7)
      A27-13 (SPD) - D56-81 (E1) B - BR Speed signal from combination meter Driving at 20 km/h (12 mph) Pulse generation (see  i waveform 8)
      A27-46 (STA) - D56-81 (E1) R - BR Starter signal Cranking 5.5 V or more
      D56-120 (NSW) - D56-81 (E1) L - BR Park/neutral position switch Ignition switch ON, Shift lever not in P or N 11 to 14 V
      Ignition switch ON, Shift lever in P or N Below 3.0 V
      A27-26 (STP) - D56-81 (E1) LG - BR Stop light switch Brake pedal depressed 7.5 to 14 V
      Brake pedal released Below 1.5 V
      A27-35 (ST1-) - D56-81 (E1) R - BR Stop light switch (opposite to STP terminal) Ignition switch ON, Brake pedal depressed Below 1.5 V
      Ignition switch ON, Brake pedal released 7.5 to 14 V
      D56-19 (M+) - D56-82 (ME01) R - W-B Throttle actuator Idling with warm engine Pulse generation (see  j waveform 9)
      D56-18 (M-) - D56-82 (ME01) G - W-B Throttle actuator Idling with warm engine Pulse generation (see  k waveform 10)
      A27-48 (FC) - D56-81 (E1) L - BR Fuel pump control Ignition switch ON 11 to 14 V
      A27-52 (FPC) - D56-81 (E1) BE - BR Fuel pump control Ignition switch ON Below 1.5 V
      A27-24 (W) - D56-81 (E1) P - BR MIL Ignition switch ON Below 3.0 V
      Idling 11 to 14 V
      A27-16 (TC) - D56-81 (E1) R - BR Terminal TC of DLC3 Ignition switch ON 11 to 14 V
      A27-15 (TACH) - D56-81 (E1) W - BR Engine speed Idling Pulse generation (see  l waveform 11)
      A27-30 (VPMP) - D56-81 (E1) V - BR Vent valve (built into canister pump module) Ignition switch ON 11 to 14 V
      A27-49 (MPMP) - D56-81 (E1) G - BR Leak detection pump (built into canister pump module) Leak detection pump OFF Below 3.0 V
      Leak detection pump ON 11 to 14 V
      D56-66 (VC) - D56-97 (ETHW) L - BR Power source for sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
      D56-121 (PPMP) - D56-97 (ETHW) P - BR Canister pressure sensor (built into canister pump module) Ignition switch ON 3.3 to 4.0 V
      D56-32 (ALT) - D56-81 (E1) R - BR Generator Ignition switch ON 11 to 14 V
      A27-10 (CANH) - D56-81 (E1) GR - BR CAN communication line Ignition switch ON Pulse generation (see  m waveform 12)
      A27-11 (CANL) - D56-81 (E1) W - BR CAN communication line Ignition switch ON Pulse generation (see  n waveform 13)
      D56-62 (ACIS) - D56-81 (E1) R-W - BR VSV for ACIS (Acoustic Control Induction System) operation signal Ignition switch ON 11 to 14 V
      D56-28 (AIRV) - D56-81 (E1) BR - BR Air switching valve for secondary air injection system Ignition switch ON 11 to 14 V
      D56-54 (AIRP) - D56-81 (E1) P - BR Air pump control Ignition switch ON 11 to 14 V
      D56-30 (AIDI) - D56-81 (E1) G - BR Diagnostic information signal for air injection system Air injection system operates Pulse generation (see  p waveform 15)
      A27-54 (AIP) - D56-98 (ETHA) Y - BR Secondary air injection system pressure signal Ignition switch ON 3.0 to 3.6 V
      A27-43 (ARV2) - D56-81 (E1) V - BR Air switching valve for secondary air injection system Ignition switch ON 11 to 14 V
      D56-53 (ARP2) - D56-81 (E1) P-L - BR Air pump control Ignition switch ON 11 to 14 V
      D56-29 (AID2) - D56-81 (E1) G - BR Diagnostic information signal for air injection system Air injection system operates Pulse generation (see  p waveform 15)
      A27-53 (AIP2) - D56-97 (ETHW) G - BR Secondary air injection system pressure signal Ignition switch ON 3.0 to 3.6 V
      D56-90 (G2) - D56- 89 (G2-) R - G Camshaft position sensor Idling Pulse generation (see  o waveform 14)
      A27-18 (DI) - D56-81 (E1) Y - BR Fuel pump control Ignition switch ON 0 to 3.0 V
      A27-14 (STSW) - D56-81 (E1) BR - BR Starter switch Shift lever in P or N, Cranking 6.0 V or more
      A27-41 (ACCR) - D56-81 (E1) BR - BR ACC relay control signal Ignition switch ON → Cranking 11 to 14 V → Below 1 V
      D56-16 (STAR) - D56-81 (E1) L - BR Starter relay control Ignition switch ON Below 1.5 V
      Cranking 5.5 V or more
      D56-72 (PSP) - D56-81 (E1) G - BR Power steering oil pressure sensor Ignition switch ON 0.5 to 4.5 V
      HINT:
      *: The ECM terminal voltage is constant regardless of the output voltage from the sensor.
    2. WAVEFORM 1:

      Camshaft Timing Oil Control Valve (OCV) 

      WAVEFORM REFERENCE CHART

      Terminal No. (Symbol) Tool Setting Condition
      D56-58 (OC1+) - D56-57 (OC1-)
      D56-52 (OC2+) - D56-51 (OC2-)      		 5 V/DIV., 1 msec./DIV. Idling
      Fig 2: Identifying Camshaft Timing Oil Control Valve (OCV) Waveform
      G04828019Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. WAVEFORM 2:

      Heated Oxygen Sensor 

      WAVEFORM REFERENCE CHART

      Terminal No. (Symbol) Tool Setting Condition
      D56-114 (OX1B) - D56-115 (EX1B)
      D56-112 (OX2B) - D56-113 (EX2B)      		 0.2 V/DIV., 200 msec./DIV. Engine speed maintained at 2500 RPM for 2 minutes after warming up sensor

      HINT:

      In Data List, item O2S B1 S2 shows the ECM input values from the heated oxygen sensor.

      Fig 3: Identifying Heated Oxygen Sensor Waveform
      G04828020Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. WAVEFORM 3:

      Injector No. 1 (to No. 8) Injection Signal 

      WAVEFORM REFERENCE CHART

      Terminal No. (Symbol) Tool Setting Condition
      D56-86 (#10) - D56-43 (E01)
      D56-109 (#20) - D56-43 (E01)
      D56-85 (#30) - D56-43 (E01)
      D56-108 (#40) - D56-43 (E01)
      D56-84 (#50) - D56-43 (E01)
      D56-107 (#60) - D56-43 (E01)
      D56-83 (#70) - D56-43 (E01)
      D56-106 (#80) - D56-43 (E01)      		 20 V/DIV., 20 msec./DIV. Idling
      Fig 4: Identifying Injection Signal Waveform
      G04828021Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      The wavelength becomes shorter as the engine RPM increases.

    5. WAVEFORM 4

      Knock Sensor 

      WAVEFORM REFERENCE CHART

      Terminal No. (Symbol) Tool Setting Condition
      D56-94 (KNK1) - D56-93 (EKNK)
      D56-117 (KNK2) - D56-116 (EKN2)      		 1 V/DIV., 1 msec./DIV. Engine speed maintained at 4000 RPM after warming up engine

      HINT:

      • The wavelength becomes shorter as the engine RPM increases.
      • The waveforms and amplitudes displayed differ slightly depending on the vehicle.
        Fig 5: Identifying Knock Sensor Waveform
        G04828022Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. WAVEFORM 5:

      Variable Valve Timing (VVT) Sensor (for Bank 1, 2) and Crankshaft Position Sensor 

      WAVEFORM REFERENCE CHART

      Terminal No. (Symbol) Tool Setting Condition
      CH1: D56-92 (VV1+) - D56-91 (VV1-)
      CH2: D56-87 (VV2+) - D56-88 (VV2-)
      CH3: D56-110 (NE+) - D56-111 (NE-)      		 2 V/DIV., 20 msec./DIV. Idle after engine warmed-up

      HINT:

      The wavelength becomes shorter as engine RPM increases.

      Fig 6: Identifying Variable Valve Timing (VVT) Sensor (For Bank 1, 2) And Crankshaft Position Sensor Waveform
      G05150107Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    7. WAVEFORM 6:

      Igniter IGT Signal (from ECM to Igniter) and Igniter IGF Signal (from Igniter to ECM) 

      WAVEFORM REFERENCE CHART

      Terminal No. (Symbol) Tool Setting Condition
      (a) D56-40 (IGT1) - D56-81 (E1)
      (a) D56-33 (IGT2) - D56-81 (E1)
      (a) D56-37 (IGT3) - D56-81 (E1)
      (a) D56-38 (IGT4) - D56-81 (E1)
      (a) D56-35 (IGT5) - D56-81 (E1)
      (a) D56-36 (IGT6) - D56-81 (E1)
      (a) D56-34 (IGT7) - D56-81 (E1)
      (a) D56-39 (IGT8) - D56-81 (E1)
      (b) D56-104 (IGF1) - D56-81 (E1)
      (b) D56-105 (IGF2) - D56-81 (E1)      		 2 V/DIV., 20 msec./DIV. Idling
      Fig 7: Identifying Igniter IGT Signal (From ECM To Igniter) And Igniter IGF Signal (From Igniter To ECM) Waveform
      G04967774Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      The wavelength becomes shorter as engine RPM increases.

    8. WAVEFORM 7:

      Purge VSV 

      WAVEFORM REFERENCE CHART

      Terminal No. (Symbol) Tool Setting Condition
      D56-63 (PRG) - D56-81 (E1) 10 V/DIV., 10 to 100 msec./DIV. Idling

      HINT:

      If the waveform is not similar to the illustration, check the waveform again after idling for 10 minutes or more.

      Fig 8: Identifying Purge VSV Waveform
      G05149265Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    9. WAVEFORM 8:

      Vehicle Speed Signal 

      WAVEFORM REFERENCE CHART

      Terminal No. (Symbol) Tool Setting Condition
      A27-13 (SPD) - D56-81 (E1) 2 V/DIV., 20 msec./DIV. Driving at 20 km/h (12 mph)

      HINT:

      The wavelength becomes shorter as the vehicle speed increases.

      Fig 9: Identifying Vehicle Speed Signal Waveform
      G04828026Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    10. WAVEFORM 9:

      Throttle Actuator Positive Terminal 

      WAVEFORM REFERENCE CHART

      Terminal No. (Symbol) Tool Setting Condition
      D56-19 (M+) - D56-82 (ME01) 5 V/DIV., 1 msec./DIV. Idling with warm engine

      HINT:

      The duty ratio varies depending on the throttle actuator operation.

      Fig 10: Identifying Throttle Actuator Positive Terminal Waveform
      G04828027Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    11. WAVEFORM 10:

      Throttle Actuator Negative Terminal 

      WAVEFORM REFERENCE CHART

      Terminal No. (Symbol) Tool Setting Condition
      D56-18 (M-) - D56-82 (ME01) 5 V/DIV., 1 msec./DIV. Idling with warm engine

      HINT:

      The duty ratio varies depending on the throttle actuator operation.

      Fig 11: Identifying Throttle Actuator Negative Terminal Waveform
      G04828028Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    12. WAVEFORM 11:

      Engine Speed Signal 

      WAVEFORM REFERENCE CHART

      Terminal No. (Symbol) Tool Setting Condition
      A27-15 (TACH) - D56-81 (E1) 5 V/DIV., 10 msec./DIV. Idling

      HINT:

      The wavelength becomes shorter as the engine RPM increases.

      Fig 12: Identifying Engine Speed Signal Waveform
      G05149668Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    13. WAVEFORM 12:

      CAN Communication Signal (Reference) 

      WAVEFORM REFERENCE CHART

      Terminal No. (Symbol) Tool Setting Condition
      A27-10 (CANH) - D56-81 (E1) 1 V/DIV., 10 μsec./DIV. Engine stops and ignition switch ON

      HINT:

      The waveform varies depending on the CAN communication signal.

      Fig 13: Identifying CAN Communication Signal Waveform
      G05149669Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    14. WAVEFORM 13:

      CAN Communication Signal (Reference) 

      WAVEFORM REFERENCE CHART

      Terminal No. (Symbol) Tool Setting Condition
      A27-11 (CANL) - D56-81 (E1) 1 V/DIV., 10 μsec./DIV. Engine stops and ignition switch ON

      HINT:

      The waveform varies depending on the CAN communication signal.

      Fig 14: Identifying CAN Communication Signal Waveform
      G05149670Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    15. WAVEFORM 14:

      Camshaft Position Sensor 

      WAVEFORM REFERENCE CHART

      Terminal No. (Symbol) Tool Setting Condition
      D56-90 (G2) - D56- 89 (G2-) 2 V/DIV., 20 msec./DIV. Idle after engine warmed up

      HINT:

      • The wavelength becomes shorter as engine RPM increases.
      • *1: 720°
      • *2: 180°
      • *3: 120°
      • *4: 60°
        Fig 15: Identifying Camshaft Position Sensor Waveform
        G05644843Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    16. WAVEFORM 15:

      Terminal PI of Air Injection Control Driver 

      WAVEFORM REFERENCE CHART

      Terminal No. (Symbol) Tool Setting Condition
      D56-30 (AIDI) - D56-81 (E1)
      D56-29 (AID2) - D56-81 (E1)      		 5 V/DIV., 20 to 40 msec./DIV. Performing system check using Techstream (air injection check)

      HINT:

      The wavelength changes when the air injection control driver detects malfunctions in the air injection system (See DTC P0412 SECONDARY AIR INJECTION SYSTEM SWITCHING VALVE "A" CIRCUIT; DTC P0415 SECONDARY AIR INJECTION SYSTEM SWITCHING VALVE "B" CIRCUIT ).

      Fig 16: Terminal DI Of Air Injection Control Driver Waveform
      G05196599Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.