LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Toyota >> 2009 >> Matrix XRS, Automatic >> Repair and Diagnosis >> Engine Performance >> Engine Control System (2AZ-FE) >> SFI System >> Terminals Of ECM
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Terminals Of ECM

Fig 1: Identifying ECM Connectors Terminals
G06039959Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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.

VOLTAGE SPECIFICATION

Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
A37-20 (BATT) - B29-104 (E1) P - BR Battery (for measuring battery voltage and for ECM memory) Always 11 to 14 V
A37-3 (+BM) - B29-104 (E1) B - BR Power source of throttle actuator Always 11 to 14 V
A37-28 (IGSW) - B29-104 (E1) B - BR Ignition switch Ignition switch ON 11 to 14 V
A37-2 (+B) - B29-104 (E1) B - BR Power source of ECM Ignition switch ON 11 to 14 V
A37-1 (+B2) - B29-104 (E1) B - BR Power source of ECM Ignition switch ON 11 to 14 V
B29-100 (OC1+) - B29-123 (OC1-) B-V Camshaft timing oil control valve Idling Pulse generation (see  1waveform 1)
A37-44 (MREL) - B29-104 (E1) L - BR EFI relay Ignition switch ON 11 to 14 V
B29-118 (VG) - B29-116 (E2G) V-B Mass air flow meter Idling, Shift lever position P or N, A/C switch OFF 0.5 to 3.0 V
B29-65 (THA) - B29-88 (ETHA) P - BR-W Intake air temperature sensor (built into mass air flow meter) Idling, Intake air temperature 20°C (68°F) 0.5 to 3.4 V
B29-97 (THW) - B29-96 (ETHW) B - BR Engine coolant temperature sensor Idling, Engine coolant temperature 80°C (176°F) 0.2 to 1.0 V
B29-67 (VCTA) - B29-91 (ETA) Y - BR Power source of throttle position sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
B29-115 (VTA1) - B29-91 (ETA) LG - BR Throttle position sensor (for engine control) Ignition switch ON, Throttle valve fully closed 0.5 to 1.1 V
Ignition switch ON, Throttle valve fully open 3.2 to 4.8 V
B29-114 (VTA2) - B29-91 (ETA) R - BR 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
A37-55 (VPA) - A37-59 (EPA) L-R 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 2.5 to 4.5 V
A37-56 (VPA2) - A37-60 (EPA2) Y-O 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 5.5 V
A37-57 (VCPA) - A37-59 (EPA) P-R Power source of accelerator pedal position sensor (for VPA) Ignition switch ON 4.5 to 5.5 V
A37-58 (VCP2) - A37-60 (EPA2) B-O Power source of accelerator pedal position sensor (for VPA2) Ignition switch ON 4.5 to 5.5 V
B29-109 (HA1A) - B29-46 (E04) R - W-B Air fuel ratio sensor heater Idling with warm engine Pulse generation (see  2waveform 2)
Ignition switch ON 11 to 14 V
B29-112 (A1A+) - B29-104 (E1) Y - BR Air fuel ratio sensor Ignition switch ON 3.3 V*1
B29-113 (A1A-) - B29-104 (E1) L - BR Air fuel ratio sensor Ignition switch ON 3.0 V*1
B29-47 (HT1B) - B29-86 (E03) P - W-B Heated oxygen sensor heater Ignition switch ON 11 to 14 V
B29-64 (OX1B) - B29-87 (EX1B) B - LG-B Heated oxygen sensor Engine speed maintained at 2500 rpm for 2 minutes after warming up sensor Pulse generation (see  3waveform 3)
B29-108 (#10) - B29-45 (E01)
B29-107 (#20) - B29-45 (E01)
B29-106 (#30) - B29-45 (E01)
B29-105 (#40) - B29-45 (E01)		 V - W-B
R - W-B
G - W-B
LG - W-B		 Fuel injector Ignition switch ON 11 to 14 V
Idling Pulse generation (see  4waveform 4)
B29-110 (KNK1) - B29-111 (EKNK) B-W Knock sensor Engine speed maintained at 4000 rpm after warming up engine Pulse generation (see  5waveform 5)
B29-99 (G2+) - B29-98 (G2-) R-W Camshaft position sensor Idling Pulse generation (see  6waveform 6)
B29-122 (NE+) - B29-121 (NE-) R-G Crankshaft position sensor Idling Pulse generation (see  6waveform 6)
B29-85 (IGT1) - B29-104 (E1)
B29-84 (IGT2) - B29-104 (E1)
B29-83 (IGT3) - B29-104 (E1)
B29-82 (IGT4) - B29-104 (E1)		 W-L - BR
B - BR
L-B - BR
B - BR		 Ignition coil (ignition signal) Idling Pulse generation (see  7waveform 7)
B29-81 (IGF1) - B29-104 (E1) Y - BR Ignition coil (ignition confirmation signal) Ignition switch ON 4.5 to 5.5 V
Idling Pulse generation (see  7waveform 7)
B29-49 (PRG) - B29-104 (E1) L-B - BR Purge VSV Ignition switch ON 11 to 14 V
Idling Pulse generation (see  8waveform 8)
A37-8 (SPD) - B29-104 (E1) V - BR Speed signal from combination meter Driving at 12 mph (20 km/h) Pulse generation (see  9waveform 9)
A37-48 (STA) - B29-104 (E1) LG - BR Starter signal Cranking 5.5 V or more
B29-52 (NSW)*2 - B29-104 (E1) W - BR Park/neutral position switch signal Ignition switch ON, transmission gear position in P or N Below 1.5 V
Ignition switch ON, transmission gear position in except P or N 6.0 V or more
A37-36 (STP) - B29-104 (E1) L - BR Stop light switch Brake pedal depressed 7.5 to 14 V
Brake pedal released Below 1.5 V
A37-35 (ST1-) - B29-104 (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
B29-42 (M+) - B29-43 (ME01) P - W-B Throttle actuator Idling with warm engine Pulse generation (see  10waveform 10)
B29-41 (M-) - B29-43 (ME01) L - W-B Throttle actuator Idling with warm engine Pulse generation (see  11waveform 11)
A37-7 (FC) - B29-104 (E1) O - BR Fuel pump control Ignition switch ON 11 to 14 V
Idling Below 1.5 V
A37-24 (W) - B29-104 (E1) R - BR MIL Ignition switch ON (MIL goes on) Below 1.5 V
Idling 11 to 14 V
A37-27 (TC) - B29-104 (E1) P - BR Terminal TC of DLC3 Ignition switch ON 11 to 14 V
A37-15 (TACH) - B29-104 (E1) GR - BR Engine speed Idling Pulse generation (see  12waveform 12)
A37-42 (VPMP) - B29-104 (E1) W - BR Vent valve (built into canister pump module) Ignition switch ON 11 to 14 V
A37-34 (MPMP) - B29-104 (E1) R - BR Leak detection pump (built into canister pump module) Leak detection pump OFF Below 3 V
Leak detection pump ON 11 to 14 V
B29-70 (VCPP) - B29-94 (EPPM) V-G Power source for canister pressure sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
B29-71 (PPMP) - B29-94 (EPPM) Y-G Canister pressure sensor (built into canister pump module) Ignition switch ON 3 to 3.6 V
A37-31 (ELS1) - B29-104 (E1) B - BR Electric load Taillight switch ON 7.5 to 14 V
Taillight switch OFF Below 1.5 V
A37-33 (ELS3) - B29-104 (E1) G - BR Electric load Defogger switch ON 7.5 to 14 V
Defogger switch OFF Below 1.5 V
A37-21 (FANL) - B29-104 (E1) R - BR No. 3 fan relay Ignition switch ON 11 to 14 V
Idling with A/C ON, or high engine coolant temperature Below 1.5 V
A37-22 (FANH) - B29-104 (E1) W - BR No. 1 and No. 2 fan relay Idling with high engine coolant temperature Below 1.5 V
B29-50 (ALT) - B29-104 (E1) L - BR Generator Ignition switch ON 11 to 14 V
A37-41 (CANH) - B29-104 (E1) Y - BR CAN communication line Ignition switch ON Pulse generation (see  13waveform 13)
A37-49 (CANL) - B29-104 (E1) W - BR CAN communication line Ignition switch ON Pulse generation (see  14waveform 14)
HINT:
*1: The ECM terminal voltage is constant regardless of the output voltage from the sensor.
*2: Automatic Transaxle
  1. WAVEFORM 1 

    Camshaft Timing Oil Control Valve 

    WAVEFORM REFERENCE

    ECM Terminal Name Between OC1+ and OC1-
    Tester Range 5 V/DIV., 1 msec./DIV.
    Condition Idling
    Fig 2: Identifying Waveform 1
    G04828019Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. WAVEFORM 2 

    Air Fuel Ratio Sensor (Sensor 1) Heater 

    WAVEFORM REFERENCE

    ECM Terminal Name Between HA1A and E04
    Tester Range 5 V/DIV., 10 msec./DIV.
    Condition Idling with warm engine

    HINT:

    The wavelength varies in accordance with the engine operating condition.

    Fig 3: Identifying Waveform 2
    G06007270Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. WAVEFORM 3 

    Heated Oxygen Sensor (Sensor 2) 

    WAVEFORM REFERENCE

    ECM Terminal Name Between OX1B and EX1B
    Tester Range 0.2 V/DIV., 200 msec./DIV.
    Condition 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 4: Identifying Waveform 3
    G04828020Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. WAVEFORM 4 

    Injector No. 1 (to No. 4) Injection Signal 

    WAVEFORM REFERENCE

    ECM Terminal Name Between #10 (to #40) and E01
    Tester Range 20 V/DIV., 20 msec./DIV.
    Condition Idling

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

    Fig 5: Identifying Waveform 4
    G06007272Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. WAVEFORM 5 

    Knock Sensor 

    WAVEFORM REFERENCE

    ECM Terminal Name Between KNK1 and EKNK
    Tester Range 1 V/DIV., 1 msec./DIV.
    Condition Engine speed maintained at 4000 rpm after warming up engine
    Fig 6: Identifying Waveform 5
    G06039964Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    • The wavelength becomes shorter as the engine rpm increases.
    • The waveforms and amplitudes displayed differ slightly depending on the vehicle.
  6. WAVEFORM 6 

    Crankshaft Position Sensor and Camshaft Position Sensor 

    WAVEFORM REFERENCE

    ECM Terminal Name CH1: Between G2+ and G2-
    CH2: Between NE+ and NE-
    Tester Range 5 V/DIV., 20 msec./DIV.
    Condition Idling

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

    Fig 7: Identifying Waveform 6
    G06007274Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. WAVEFORM 7 

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

    WAVEFORM REFERENCE

    ECM Terminal Name Between IGT (1 to 4) and E1
    Between IGF1 and E1
    Tester Range 2 V/DIV., 20 msec./DIV.
    Condition Idling

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

    Fig 8: Identifying Waveform 7
    G06007275Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. WAVEFORM 8 

    Purge VSV 

    WAVEFORM REFERENCE

    ECM Terminal Name Between PRG and E1
    Tester Range 10 V/DIV., 20 msec./DIV.
    Condition Idling

    HINT:

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

    Fig 9: Identifying Waveform 8
    G06007276Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  9. WAVEFORM 9 

    Vehicle Speed Signal 

    WAVEFORM REFERENCE

    ECM Terminal Name Between SPD and E1
    Tester Range 2V/DIV., 20 msec./DIV.
    Condition Driving at 12 mph (20 km/h)

    HINT:

    The wavelength becomes shorter as the vehicle speed increases.

    Fig 10: Identifying Waveform 9
    G05199988Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  10. WAVEFORM 10 

    Throttle Actuator Positive Terminal 

    WAVEFORM REFERENCE

    ECM Terminal Name Between M+ and ME01
    Tester Range 5 V/DIV., 1 msec./DIV.
    Condition Idling with warm engine

    HINT:

    The duty ratio varies depending on the throttle actuator operation.

    Fig 11: Identifying Waveform 10
    G06007278Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  11. WAVEFORM 11 

    Throttle Actuator Negative Terminal 

    WAVEFORM REFERENCE

    ECM Terminal Name Between M- and ME01
    Tester Range 5 V/DIV., 1 msec./DIV.
    Condition Idling with warm engine

    HINT:

    The duty ratio varies depending on the throttle actuator operation.

    Fig 12: Identifying Waveform 11
    G06007279Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  12. WAVEFORM 12 

    Engine Speed Signal 

    WAVEFORM REFERENCE

    ECM Terminal Name Between TACH and E1
    Tester Range 5 V/DIV., 10 msec./DIV.
    Condition Idling

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

    Fig 13: Identifying Waveform 12
    G06007280Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  13. WAVEFORM 13 

    CAN Communication Signal (Reference) 

    WAVEFORM REFERENCE

    ECM Terminal Name Between CANH and E1
    Tester Range 1 V/DIV., 10 μsec./DIV.
    Condition Engine stops and ignition switch ON

    HINT:

    The waveform varies depending on the CAN communication signal.

    Fig 14: Identifying Waveform 13
    G06039972Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  14. WAVEFORM 14 

    CAN Communication Signal (Reference) 

    WAVEFORM REFERENCE

    ECM Terminal Name Between CANL and E1
    Tester Range 1 V/DIV., 10 μsec./DIV.
    Condition Engine stops and ignition switch ON

    HINT:

    The waveform varies depending on the CAN communication signal.

    Fig 15: Identifying Waveform 14
    G04828031Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
scientia non olet · About LEMON Manuals