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Terminals Of ECM

Fig 1: Identifying ECM Terminals
G04972990Courtesy 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, displayed in the Specified Condition column. The illustration above can be used as a reference to identify the ECM terminal locations.

TERMINAL DESCRIPTIONS SPECIFIED CONDITIONS CHART

Symbols (Terminal No.) Wiring Colors Terminal Descriptions Conditions Specified Conditions
BATT (A24-20) - E1 (C24-104) Y - W-B Battery (for measuring battery voltage and for ECM memory) Always 9 to 14 V
+BM (A24-3) - E1 (C24-104) LG - W-B Power source of throttle actuator Always 9 to 14 V
IGSW (A24-28) - E1 (C24-104) Y - W-B Ignition switch Ignition switch to the ON position 9 to 14 V
+B (A24-2) - E1 (C24-104) R - W-B Power source of ECM Ignition switch to the ON position 9 to 14 V
+B2 (A24-1) - E1 (C24-104) R - W-B Power source of ECM Ignition switch to the ON position 9 to 14 V
OC1+ (C24-100) - OC1- (C24-123) W-B Camshaft timing oil control valve (OCV) Idling Pulse generation (see  1waveform 1)
MREL (A24-44) - E1 (C24-104) O - W-B EFI relay Ignition switch to the ON position 9 to 14 V
VG (C24-118) - E2G (C24-116) SB - W Mass air flow meter Idling, Shift lever position P or N, A/ C switch OFF 0.5 to 3.0 V
THA (C24-65) - ETHA (C24-88) P-Y Intake air temperature sensor Idling, Intake air temperature 20°C (68°F) 0.5 to 3.4 V
THW (C24-97) - ETHW (C24-96) B-P Engine coolant temperature sensor Idling, Engine coolant temperature 80°C (176°F) 0.2 to 1.0 V
VCTA (C24-67) - ETA (C24-91) B-P Power source of throttle position sensor (specific voltage) Ignition switch to the ON position 4.5 to 5.5 V
VTA1 (C24-115) - ETA (C24-91) Y-P Throttle position sensor (for engine control) Ignition switch to the ON position, Throttle valve fully closed 0.5 to 1.1 V
Ignition switch to the ON position, Throttle valve fully open 3.3 to 4.9 V
VTA2 (C24-114) - ETA (C24-91) W-L-P Throttle position sensor (for sensor malfunction detection) Ignition switch to the ON position, Throttle valve fully closed 2.1 to 3.1 V
Ignition switch to the ON position, Throttle valve fully open 4.6 to 5.0 V
VPA (A24-55) - EPA (A24-59) G-Y Accelerator pedal position sensor (for engine control) Ignition switch to the ON position, Accelerator pedal released 0.5 to 1.1 V
Ignition switch to the ON position, Accelerator pedal fully depressed 2.6 to 4.5 V
VPA2 (A24-56) - EPA2 (A24-60) R-O Accelerator pedal position sensor (for sensor malfunctioning detection) Ignition switch to the ON position, Accelerator pedal released 1.2 to 2.0 V
Ignition switch to the ON position, Accelerator pedal fully depressed 3.4 to 5.0 V
VCPA (A24-57) - EPA (A24-59) B - Y Power source of accelerator pedal position sensor (for VPA) Ignition switch to the ON position 4.5 to 5.5 V
VCP2 (A24-58) - EPA2 (A24-60) L - O Power source of accelerator pedal position sensor, (for VPA2) Ignition switch to the ON position 4.5 to 5.5 V
HA1A (C24-109) - E04 (C24-46) G - W A/F sensor heater Idling Below 3.0 V
Ignition switch to the ON position 9 to 14 V
A1A+ (C24-112) - E1 (C24-104) L - W-B A/F sensor Ignition switch to the ON position 3.3 V*1
A1A- (C24-113) - E1 (C24-104) P - W-B A/F sensor Ignition switch to the ON position 3.0 V*1
HT1B (C24-47) - E03 (C24-86) LG - B Heated oxygen sensor heater Idling Below 3.0 V
Ignition switch to the ON position 9 to 14 V
OX1B (C24-64) - EX1B (C24-87) W - BR Heated oxygen sensor Engine speed maintained at 2,500 rpm for 2 minutes after warming up sensor Pulse generation (see  2waveform 2)
#10 (C24-108) - E01 (C24-45) B - W-B Injector Ignition switch to the ON position 9 to 14 V
#20 (C24-107) - E01 (C24-45) R - W-B Idling Pulse generation (see  3waveform 3)
#30 (C24-106) - E01 (C24-45) Y - W-B
#40 (C24-105) - E01 (C24-45) L - W-B
KNK1 (C24-110) - EKNK (C24-111) G-R Knock sensor Engine speed maintained at 4,000 after warming up engine Pulse generation (see  4waveform 4)
G2+ (C24-99) - G2- (C24-98) Y - BR Camshaft position sensor Idling Pulse generation (see  5waveform 5)
NE+ (C24-122) - NE- (C24-121) G - R Crankshaft position sensor Idling Pulse generation (see  5waveform 5)
IGT1 (C24-85) - E1 (C24-104) W-W-B Ignition coil (ignition signal) Idling Pulse generation (see  6waveform 6)
IGT2 (C24-84) - E1 (C24-104) G-R - W-B
IGT3 (C24-83) - E1 (C24-104) G-W-B
IGT4 (C24-82) - E1 (C24-104) LG - W-B
IGF1 (C24-81) - E1 (C24-104) BR - W-B Ignition coil (ignition confirmation signal) Ignition switch to the ON position 4.5 to 5.5 V
Idling Pulse generation (see  7waveform 6)
PRG (C24-49) - E1 (C24-104) O - W-B Purge VSV Ignition switch to the ON position 9 to 14 V
Idling Pulse generation (see  7waveform 7)
SPD (A24-8) - E1 (C24-104) L - W-B Speed signal from combination meter Driving at 12 mph (20 km/h) Pulse generation (see  8waveform 8)
STA (A24-48) - E1 (C24-104) V - W-B Starter signal Cranking 5.5 V or more
NSW (C24-52)*2 - E1 (C24-104) SB - W-B Starter relay control Ignition switch to the ON position Below 1.5 V
Cranking 5.5 V or more
STP (A24-36) - E1 (C24-104) W - W-B Stop light switch Brake pedal depressed 7.5 to 14 V
Brake pedal released Below 1.5 V
ST1- (A24-35) - E1 (C24-104) GR - W-B Stop light switch (opposite to STP terminal) Ignition switch to the ON position, Brake pedal depressed Below 1.5 V
Ignition switch to the ON position, Brake pedal released 7.5 to 14 V
M+ (C24-42) - ME01 (C24-43) G - B Throttle actuator Idling with warm engine Pulse generation (see  9waveform 9)
M- (C24-41) - ME01 (C24-43) R - B Throttle actuator Idling with warm engine Pulse generation (see  10waveform 10)
FC (A24-7) - E1 (C24-104) Y - W-B Fuel pump control Ignition switch to the ON position 9 to 14 V
Idling Below 1.5 V
W (A24-24) - E1 (C24-104) BR - W-B MIL Ignition switch to the ON position Below 1.5 V
Idling 9 to 14 V
TC (A24-27) - E1 (C24-104) P - W-B Terminal TC of DLC3 Ignition switch to the ON position 9 to 14 V
TACH (A24-15) - E1 (C24-104) B - W-B Engine speed Idling Pulse generation (see  11waveform 11)
VPMP (A24-42) - E1 (C24-104) W - W-B Vent valve (built into canister pump module) Ignition switch to the ON position 9 to 14 V
MPMP (A24-34) - E1 (C24-104) G - W-B Leak detection pump (built into canister pump module) Leak detection pump OFF Below 3 V
Leak detection pump ON 9 to 14V
VCPP (C24-70) - EPPM (C24-94) R - G Power source for canister pressure sensor (specific voltage) Ignition switch to the ON position 4.5 to 5.5 V
PPMP (C24-71) - EPPM (C24-94) L - G Canister pressure sensor (built into canister pump module) Ignition switch to the ON position 3 to 3.6 V
FANL (A24-21) - E1 (C24-104) R - W-B Fan No. 1 relay Ignition switch to the ON position 9 to 14 V
Idling with A/C ON, or high engine coolant temperature Below 1.5 V
FANH (A24-22) - E1 (C24-104) W - W-B Fan No. 2, 3 relay Idling with high engine coolant temperature Below 1.5 V
ALT (C24-50) - E1 (C24-104) L - W-B Generator Ignition switch to the ON position 9 to 14 V
CANH (A24-41) - E1 (C24-104) B - W-B CAN communication line Ignition switch to the ON position Pulse generation (see  12waveform 12)
CANL (A24-49) - E1 (C24-104) W - W-B CAN communication line Ignition switch to the ON position Pulse generation (see  13waveform 13)
IAC+ (A24-33)*3 - E1 (C24-104) L - W-B Intake manifold runner valve motor Ignition switch to the ON position Pulse generation
IAC- (A24-52)*3 - E1 (C24-104) W - W-B Intake manifold runner valve motor Ignition switch to the ON position Pulse generation
VCIA (C24-103)*3 - EIA (C24-126)*3 B-L Power source of intake manifold runner valve position sensor (Specific voltage) Ignition switch to the ON position 4.5 to 5.5 V
IACA (C24-93)*3 - EIA (C24-126)*3 B - W-L Intake manifold runner valve position sensor Ignition switch to the ON position, intake manifold runner valve fully closed. 0.2 to 1.0 V
Ignition switch to the ON position, intake manifold runner valve fully opened. 3.2 to 4.8 V
HINT:
*1: The ECM terminal voltage is constant regardless of the output voltage from the sensor.
*2: Automatic transaxle only
*3: PZEV only
  1. WAVEFORM 1 

    Camshaft timing oil control valve (OCV): 

    WAVEFORM 1 REFERENCE

    ECM Terminal Names Between OC1+ and OC1-
    Tester Ranges 5 V/DIV, 1 ms./DIV.
    Conditions Idling
    Fig 2: Waveform 1 Graph
    G05007651Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. WAVEFORM 2 

    Heated oxygen sensor: 

    WAVEFORM 2 REFERENCE

    ECM Terminal Names Between OX1B and EX1B
    Tester Ranges 0.2 V/DIV, 200 ms./DIV.
    Conditions Engine speed maintained at 2,500 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: Waveform 2 Graph
    G05558240Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. WAVEFORM 3 

    Injector No. 1 (to No. 4) injection signal: 

    WAVEFORM 3 REFERENCE

    ECM Terminal Names Between #10 (to #40) and E01
    Tester Ranges 20 V/DIV, 20ms./DIV.
    Conditions Idling

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

    Fig 4: Waveform 3 Graph
    G04972993Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. WAVEFORM 4 

    Knock sensor: 

    WAVEFORM 4 REFERENCE

    ECM Terminal Names Between KNK1 and EKNK
    Tester Ranges 1 V/DIV, 1 ms./DIV.
    Conditions Engine speed maintained at 4,000 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: Waveform 4 Graph
      G05007654Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. WAVEFORM 5 

    Crankshaft position sensor and Camshaft position sensor: 

    WAVEFORM 5 REFERENCE

    ECM Terminal Names CH1: Between G2+ and G2-
    CH2: Between NE+ and NE-
    Tester Ranges 5 V/DIV, 20ms./DIV.
    Conditions Idling

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

    Fig 6: Waveform 5 Graph
    G04972995Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. WAVEFORM 6 

    Igniter IGT signal (from ECM to igniter) and Igniter IGF signal (from igniter to ECM): 

    WAVEFORM 6 REFERENCE

    ECM Terminal Names Between IGT (1 to 4) and E1
    Between IGF1 and E1
    Tester Ranges 2 V/DIV, 20 ms./DIV.
    Conditions Idling

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

    Fig 7: Waveform 6 Graph
    G04972996Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. WAVEFORM 7 

    7 Purge VSV: 

    WAVEFORM 7 REFERENCE

    ECM Terminal Names Between PRG and E1
    Tester Ranges 5 V/DIV., 50 ms./DIV.
    Conditions Idling

    HINT:

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

    Fig 8: Waveform 7 Graph
    G04972997Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. WAVEFORM 8 

    Vehicle speed signal: 

    WAVEFORM 8 REFERENCE

    ECM Terminal Names Between SPD and E1
    Tester Ranges 2V/DIV., 20ms./DIV.
    Conditions Driving at 12 mph (20 km/h)

    HINT:

    The wavelength becomes shorter as the vehicle speed increases.

    Fig 9: Waveform 8 Graph
    G04972998Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  9. WAVEFORM 9 

    Throttle actuator positive terminal: 

    WAVEFORM 9 REFERENCE

    ECM Terminal Names Between M+ and ME01
    Tester Ranges 5 V/DIV., 1 ms./DIV.
    Conditions Idling with warm engine

    HINT:

    The duty ratio varies depending on the throttle actuator operation.

    Fig 10: Waveform 9 Graph
    G04972999Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  10. WAVEFORM 10 

    Throttle actuator negative terminal: 

    WAVEFORM 10 REFERENCE

    ECM Terminal Names Between M- and ME01
    Tester Ranges 5 V/DIV., 1 ms./DIV.
    Conditions Idling with warm engine

    HINT:

    The duty ratio varies depending on the throttle actuator operation.

    Fig 11: Waveform 10 Graph
    G04973000Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  11. WAVEFORM 11 

    Engine speed signal: 

    WAVEFORM 11 REFERENCE

    ECM Terminal Names Between TACH and E1
    Tester Ranges 5 V/DIV., 10ms./DIV.
    Conditions Idling

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

    Fig 12: Waveform 11 Graph
    G04973001Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  12. WAVEFORM 12 

    CAN communication signal: 

    WAVEFORM 12 REFERENCE

    ECM Terminal Names Between CANH and E1
    Tester Ranges 1 V/DIV., 10 μsec./DIV.
    Conditions Engine stops and ignition switch to the ON position

    HINT:

    The waveform varies depending on the CAN communication signal.

    Fig 13: Waveform 12 Graph
    G05558250Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  13. WAVEFORM 13 

    CAN communication signal: 

    WAVEFORM 13 REFERENCE

    ECM Terminal Names Between CANL and E1
    Tester Ranges 1 V/DIV., 10 μsec/DIV.
    Conditions Engine stops and ignition switch to the ON position

    HINT:

    The waveform varies depending on the CAN communication signal.

    Fig 14: Waveform 13 Graph
    G05558251Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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