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Terminals Of ECM

Fig 1: Identifying ECM Connector Terminals
G06040408Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

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

TERMINAL DESCRIPTIONS SPECIFIED CONDITIONS CHART

Terminal No. (Symbol) Wiring Colors Terminal Descriptions Conditions Specified Conditions
A37-20 (BATT) - B29-104 (E1) P - BR Battery (for measuring battery voltage and for ECM memory) Always 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
A37-3 (+BM) - B29-104 (E1) B - BR Power source of throttle actuator Always 11 to 14 V
B29-85 (IGT1) - B29-104 (ED W-L - BR Ignition coil (ignition signal) Idling Pulse generation (see  1waveform 1)
B29-84 (IGT2) - B29-104 (E1) B - BR
B29-83 (IGT3) - B29-104 (E1) L-B - BR
B29-82 (IGT4) - B29-104 (E1) B - BR
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  1waveform 1)
B29-122 (NE+) - B29-121 (NE-) R - G Crankshaft position sensor Idling Pulse generation (see  2waveform 2)
B29-99 (G2+) - B29-98 (G2-) R - W Camshaft position sensor (for intake camshaft) Idling Pulse generation (see  2waveform 2)
B29-76 (EV1+) - B29-75 (EV1-) R - W Camshaft position sensor (for exhaust camshaft) Idling Pulse generation (see  2waveform 2)
B29-108 (#10) - B29-45 (E01) V - W-B Fuel injector Ignition switch ON 11 to 14 V
B29-107 (#20) - B29-45 (E01) Y - W-B
B29-106 (#30) - B29-45 (E01) G - W-B Idling Pulse generation (see  3waveform 3)
B29-105 (#40) - B29-45 (E01) L-G - W-B
B29-109 (HA1A) - B29-46 (E04) R - W-B Air fuel ratio sensor (sensor 1) heater Ignition switch ON 11 to 14 V
Idling Pulse generation (see  4waveform 4)
B29-112 (A1A+) - B29-113 (A1A-) Y-L Air fuel ratio sensor (sensor 1) Idling Below 3.3 V*1
B29-47 (HT1B) - B29-86 (E03) P - W-B Heated oxygen sensor (sensor 2) heater Ignition switch ON 11 to 14 V
Idling Below 3.0 V
B29-64 (OX1B) - B29-87 (EX1B) B - LG-B Heated oxygen sensor (sensor 2) Engine speed maintained at 2500 rpm for 2 minutes after warming up sensor Pulse generation (see  5waveform 5)
B29-110 (KNK1) - B29-111 (EKNK) B - W Knock sensor Engine speed maintained at 4000 rpm after warming up engine Pulse generation (see  6waveform 6)
A37-8 (SPD) - B29-104 (E1) V - BR Speed signal from combination meter Driving at 12 mph (20 km/h) Pulse generation (see  7waveform 7)
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
B29-65 (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
B29-118 (VG) - B29-116 (E2G) V - B Mass air flow meter Idling, shift lever in P or N, A/C switch OFF 0.5 to 3.0 V
A37-24 (W) - B29-104 (E1) R - BR MIL Ignition switch ON (MIL goes ON) Below 3.0 V
Idling 11 to 14 V
A37-48 (STA) - B29-104 (E1) LG - BR Starter signal Ignition switch ON Below 1.5 V
Cranking 5.5 V or more
B29-52 (STAR) - B29-104 (E1) W - BR Starter relay control Ignition switch ON Shift position P or N Below 1.5 V
Cranking 5.5 V or more
A37-13 (ACCR) - B29-104 (E1) L-Y - BR ACC (cut) relay control signal Ignition switch ON 8 to 14 V
Cranking 0.1 to 0.8 V
A37-14 (STSW) - B29-104 (E1) W-G - BR Starter relay operation signal Ignition switch ON Below 1.5 V
Ignition switch START Shift position P or N 5.5 V or more
B29-115 (VTA1) - B29-91 (ETA) LG - BR Throttle position sensor (for engine control) Ignition switch ON, Accelerator pedal released (Throttle valve fully closed) 0.5 to 1.1 V
Ignition switch ON, Accelerator pedal depressed (Throttle valve fully open) 3.2 to 4.8 V
B29-114 (VTA2) - B29-91 (ETA) R-G - BR Throttle position sensor (for sensor malfunction detection) Ignition switch ON, Accelerator pedal released (Throttle valve fully closed) 2.1 to 3.1 V
Ignition switch ON, Accelerator pedal depressed (Throttle valve fully open) 4.5 to 5.5 V
B29-67 (VCTA) - B29-91 (ETA) Y - BR Power source of sensor (specific voltage) Ignition switch ON 4.5 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
A37-55 (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 malfunction 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
A37-58 (VCP2) - A37-60 (EPA2) B - O Power source of accelerator pedal position sensor (for VPA2) Ignition switch ON 4.5 to 5.5 V
B29-42 (M+) - B29-43 (ME01) P - W-B Throttle actuator Idling with warm engine Pulse generation (see  8waveform 8)
B29-41 (M-) - B29-43 (ME01) L - W-B Throttle actuator Idling with warm engine Pulse generation (see  9waveform 9)
A37-36 (STP) - B29-104 (E1) L - BR Stop light switch Brake pedal depressed 11 to 14 V
Brake pedal released Below 1.5 V
A37-35 (ST1-) - B29-104 (E1) R - BR Stop light switch Ignition switch ON, Brake pedal depressed Below 1.5 V
Ignition switch ON, Brake pedal released 11 to 14 V
B29-49 (PRG) - B29-104 (E1) L-B - BR Purge VSV Ignition switch ON 11 to 14 V
Idling, under purge control Pulse generation (see  10waveform 10)
A37-7 (FC) - B29-104 (E1) O - BR Fuel pump control Ignition switch ON 11 to 14 V
Idling Below 1.5 V
A37-15 (TACH) - B29-104 (E1) GR - BR Engine speed Idling Pulse generation (see  11waveform 11)
A37-27 (TC) - B29-104 (E1) P - BR Terminal TC of DLC3 Ignition switch ON 11 to 14 V
B29-100 (OC1+) - B29-123 (OC1-) B - V-Y Camshaft timing oil control valve (for intake camshaft) Idling Pulse generation (see  12waveform 12)
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)
A37-28 (IGSW) - B29-104 (E1) B - BR Ignition switch Ignition switch ON 11 to 14 V
A37-44 (MREL) - B29-104 (E1) L - BR EFI MAIN relay Ignition switch ON 11 to 14 V
B29-60 (OE1+) - B29-61 (OE1-) BR-B - P Camshaft timing oil control valve (for exhaust camshaft) Idling Pulse generation (see  15waveform 15)
B29-70 (VCV1) - B29-104 (E1) BR-R - BR Power source of camshaft position sensor (for intake camshaft) Ignition switch ON 4.5 to 5.5 V
B29-117 (VC) - B29-104 (E1) BR-R - BR Power source of camshaft position sensor (for exhaust camshaft) Ignition switch ON 4.5 to 5.5 V
A37-31 (ELS1) - B29-104 (E1) G - BR Electric load Taillight switch ON 7.5 to 14 V
Taillight switch OFF Below 1.5 V
A37-33 (ELS2) - B29-104 (E1) B - BR Electric load Defogger switch ON 7.5 to 14 V
Defogger switch OFF Below 1.5 V
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
B29-69 (VCPP) - B29-92 (EPPM) V - G Power source for canister pressure sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
B29-68 (PPMP) - B29-92 (EPPM) Y - G Canister pressure sensor (built into canister pump module) Ignition switch ON 3 to 3.6 V
A37-43 (RFC) - B29-104 (E1) R-G - BR Cooling fan control Ignition switch ON Below 1.5 V
HINT:
*1: The ECM terminal voltage is constant regardless of the output voltage from the sensor.
  1. WAVEFORM 1 

    Igniter IGT Signal (from ECM to Igniter) 

    WAVEFORM REFERENCE

    ECM Terminal Name Between IGT (1 to 4) and E1

    Between IGF1 and E1
    Tester Range 2 V/DIV, 20 ms/DIV
    Condition Idling

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

    Fig 2: Identifying Waveform 1
    G06007711Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. WAVEFORM 2 

    Crankshaft Position Sensor and Camshaft Position Sensors 

    WAVEFORM REFERENCE

    ECM Terminal Name Between NE+ and NE-
    Between G2+ and G2-
    Between EV1+ and EV1-
    Tester Range 5 V/DIV, 20 ms/DIV
    Condition Idle after engine warmed-up

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

    Fig 3: Identifying Waveform 2
    G06007712Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. WAVEFORM 3 

    No. 1 (to No. 4) Injector Signal 

    WAVEFORM REFERENCE

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

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

    Fig 4: Identifying Waveform 3
    G06007713Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. WAVEFORM 4 

    Air Fuel Ratio Sensor (Sensor 1) Heater 

    WAVEFORM REFERENCE

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

    HINT:

    The wavelength varies in accordance with the engine operating condition.

    Fig 5: Identifying Waveform 4
    G06007714Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. WAVEFORM 5 

    Heated Oxygen Sensor (Sensor 2) 

    WAVEFORM REFERENCE

    ECM Terminal Name Between OX1B and EX1B
    Tester Range 0.2 V/DIV. 200 ms/DIV
    Condition Maintain engine speed at 2500 rpm for 2 minutes after warming up sensor

    HINT:

    In the Data List, the items O2S B1 S2 show the values input to the ECM from the heated oxygen sensor.

    Fig 6: Identifying Waveform 5
    G06007715Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. WAVEFORM 6 

    Knock Sensor 

    WAVEFORM REFERENCE

    ECM Terminal Name Between KNK1 and EKNK
    Tester Range 500 mv/DIV, 1 ms/DIV
    Condition Maintain engine RPM at 4000 rpm after engine warmed-up

    HINT:

    • The wavelength becomes shorter as the engine rpm increases.
    • The waveforms and amplitudes displayed differ slightly depending on the vehicle condition.
    Fig 7: Identifying Waveform 6
    G05398384Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. WAVEFORM 7 

    Vehicle Speed Signal 

    WAVEFORM REFERENCE

    ECM Terminal Name Between SPD and E1
    Tester Range 5 V/DIV, 20 ms/DIV
    Condition Rotate driving wheel slowly

    HINT:

    The wavelength becomes shorter as the vehicle speed increases.

    Fig 8: Identifying Waveform 7
    G06007717Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. WAVEFORM 8 

    Throttle Actuator Positive Terminal 

    WAVEFORM REFERENCE

    ECM Terminal Name Between M+ and ME01
    Tester Range 5 V/DIV, 1 ms/DIV
    Condition Idle after engine warmed-up

    HINT:

    The duty ratio varies depending on the throttle actuator operation.

    Fig 9: Identifying Waveform 8
    G06007718Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  9. WAVEFORM 9 

    Throttle Actuator Negative Terminal 

    WAVEFORM REFERENCE

    ECM Terminal Name Between M- and ME01
    Tester Range 5 V/DIV, 1 ms/DIV
    Condition Idle after engine warmed-up

    HINT:

    The duty ratio varies depending on the throttle actuator operation.

    Fig 10: Identifying Waveform 9
    G06007719Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  10. WAVEFORM 10 

    Purge VSV 

    WAVEFORM REFERENCE

    ECM Terminal Name Between PRG and E1
    Tester Range 10 V/DIV, 20 ms/DIV
    Condition Idling, under purge control

    HINT:

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

    Fig 11: Identifying Waveform 10
    G06007720Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  11. WAVEFORM 11 

    Engine Speed Signal 

    WAVEFORM REFERENCE

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

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

    Fig 12: Identifying Waveform 11
    G06007721Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  12. WAVEFORM 12 

    Camshaft Timing Oil Control Valve (for Intake Camshaft) 

    WAVEFORM REFERENCE

    ECM Terminal Name Between OC1+ and OC1-
    Tester Range 5 V/DIV, 1 ms/DIV
    Condition Idling
    Fig 13: Identifying Waveform 12
    G06007722Courtesy 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 μs/DIV
    Condition Engine stopped and ignition switch ON

    HINT:

    The waveform varies depending on the CAN communication signal.

    Fig 14: Identifying Waveform 13
    G06007723Courtesy 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 μs/DIV
    Condition Engine stopped and ignition switch ON

    HINT:

    The waveform varies depending on the CAN communication signal.

    Fig 15: Identifying Waveform 14
    G06007724Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  15. WAVEFORM 15 

    Camshaft Timing Oil Control Valve (for Exhaust Camshaft) 

    WAVEFORM REFERENCE

    ECM Terminal Name Between OE1+ and OE1-
    Tester Range 5 V/DIV, 1 ms/DIV
    Condition Idling
    Fig 16: Identifying Waveform 15
    G06007725Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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