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Terminals Of ECM

Fig 1: Identifying ECM Terminals
G05183447Courtesy 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

Symbols (Terminal No.) Wiring Colors Terminal Descriptions Conditions Specified Conditions
BATT (A9-20) - E1 (B30-104) W - BR Battery (for measuring battery voltage and for ECM memory) Always 9 to 14 V
+BM (A9-3) - E1 (B30-104) LG - BR Power source of throttle actuator Always 9 to 14 V
IGSW (A9-28) - E1 (B30-104) B - BR Ignition switch Ignition switch ON 9 to 14 V
+B (A9-2) - E1 (B30-104) B - BR Power source of ECM Ignition switch ON 9 to 14 V
+B2 (A9-1) - E1 (B30-104) B - BR Power source of ECM Ignition switch ON 9 to 14 V
OC1+ (B30-100) - OC1- (B30-123) BR-L Camshaft timing oil control valve (OCV) Idling Pulse generation (see  1waveform 1)
MREL (A9-44) - E1 (B30-104) O - BR EFI relay Ignition switch ON 9 to 14 V
VG (B30-118) - E2G (B30-116) R - LG Mass air flow meter Idling, Shift lever position P or N, A/C switch OFF 0.5 to 3.0 V
THA (B30-65) - ETHA (B30-88) W - BR Intake air temperature sensor Idling, Intake air temperature 20°C (68°F) 0.5 to 3.4 V
THW (B30-97) - ETHW (B30-96) GR - BR Engine coolant temperature sensor Idling, Engine coolant temperature 80°C (176°F) 0.2 to 1.0 V
VCTA (B30-67) - ETA (B30-91) Y - BR Power source of throttle position sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
VTA1 (B30-115) - ETA (B30-91) G - 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		 3.3 to 4.9 V
VTA2 (B30-114) - ETA (B30-91) L - 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		 4.6 to 5.0 V
VPA (A9-55) - EPA (A9-59) W - Y 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
VPA2 (A9-56) - EPA2 (A9-60) R - 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 5.0 V
VCPA (A9-57) - EPA (A9-59) B - Y Power source of accelerator pedal position sensor (for VPA) Ignition switch ON 4.5 to 5.5 V
VCP2 (A9-58) - EPA2 (A9-60) L - O Power source of accelerator pedal position sensor (for VPA2) Ignition switch ON 4.5 to 5.5 V
HA1A (B30-109) - E04 (B30-46) L - W-B A/F sensor heater Idling Below 3.0 V
Ignition switch ON 9 to 14 V
A1A+ (B30-112) - E1 (B30-104) G - BR A/F sensor Ignition switch ON 3.3 V*
A1A- (B30-113) - E1 (B30-104) R - BR A/F sensor Ignition switch ON 3.0 V*
HT1B (B30-47) - E03 (B30-86) R - W-B Heated oxygen sensor heater Idling Below 3.0 V
Ignition switch ON 9 to 14 V
OX1B (B30-64) - EX1B (B30-87) B - BR Heated oxygen sensor Engine speed maintained at 2,500 rpm for 2 minutes after warming up sensor Pulse generation (see  2waveform 2)
#10 (B30-108) - E01 (B30-45) L - W-B Injector Ignition switch ON 9 to 14 V
#20 (B30-107) - E01 (B30-45) G - W-B Idling Pulse generation (see  3waveform 3)
#30 (B30-106) - E01 (B30-45) B - W-B
#40 (B30-105) - E01 (B30-45) W - W-B
KNK1 (B30-110) - EKNK (B30-111) B-W Knock sensor Engine speed maintained at 4,000 after warming up engine Pulse generation (see  4waveform 4)
G2+ (B30-99) - G2- (B30-98) L - Y Camshaft position sensor Idling Pulse generation (see  5waveform 5)
NE+ (B30-122) - NE- (B30-121) W - B Crankshaft position sensor Idling Pulse generation (see  5waveform 5)
IGT1 (B30-85) - E1 (B30-104) R - BR Ignition coil (ignition signal) Idling Pulse generation (see  6waveform 6)
IGT2 (B30-84) - E1 (B30-104) P - BR
IGT3 (B30-83) - E1 (B30-104) G - BR
IGT4 (B30-82) - E1 (B30-104) L - BR
IGF1 (B30-81) - E1 (B30-104) W - BR Ignition coil (ignition confirmation signal) Ignition switch ON 4.5 to 5.5 V
Idling Pulse generation (see  6waveform 6)
PRG (B30-49) - E1 (B30-104) G - BR Purge VSV Ignition switch ON 9 to 14 V
Idling Pulse generation (see  7waveform 7)
SPD (A9-8) - E1 (B30-104) V - BR Speed signal from combination meter Driving at 20 km/h (12 mph) Pulse generation (see  8waveform 8)
STA (A9-48) - E1 (B30-104) LG - BR Starter signal Cranking 5.5 V or more
STAR (B30-52) - E1 (B30-104) W - BR Starter relay control Ignition switch ON Below 1.5 V
Cranking 6.0 V or more
STP (A9-36) - E1 (B30-104) L - BR Stop light switch Brake pedal depressed 7.5 to 14 V
Brake pedal released Below 1.5 V
ST1- (A9-35) - E1 (B30-104) GR - 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
M+ (B30-42) - ME01 (B30-43) B-W-B Throttle actuator Idling with warm engine Pulse generation (see  9waveform 9)
M- (B30-41) - ME01 (B30-43) W - W-B Throttle actuator Idling with warm engine Pulse generation (see  10waveform 10)
FC (A9-7) - E1 (B30-104) W - BR Fuel pump control Ignition switch ON 9 to 14 V
Idling Below 1.5 V
W (A9-24) - E1 (B30-104) R - BR MIL Ignition switch ON Below 1.5 V
Idling 9 to 14 V
TC (A9-27) - E1 (B30-104) G - BR Terminal TC of DLC3 Ignition switch ON 9 to 14 V
TACH (A9-15) - E1 (B30-104) GR - BR Engine speed Idling Pulse generation (see  11waveform 11)
VPMP (A9-42) - E1 (B30-104) W - BR Vent valve (built into canister pump module) Ignition switch ON 9 to 14 V
MPMP (A9-34) - E1 (B30-104) B - BR Leak detection pump (built into canister pump module) Leak detection pump OFF Below 3 V
Leak detection pump ON 9 to 14 V
VCPP (B30-70) - EPPM (B30-94) Y - BR Power source for canister pressure sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V
PPMP (B30-71) - EPPM (B30-94) V - BR Canister pressure sensor (built into canister pump module) Ignition switch ON 3 to 3.6 V
ELS1 (A9-31) - E1 (B30-104) O - BR Electric load Taillight switch ON 7.5 to 14 V
Taillight switch OFF Below 1.5 V
ELS3 (A9-33) - E1 (B30-104) G - BR Electric load Defogger switch ON 7.5 to 14 V
Defogger switch OFF Below 1.5 V
FANL (A9-21) - E1 (B30-104) R - BR Fan No. 1 relay Ignition switch ON 9 to 14 V
Idling with A/C ON, or high engine coolant temperature Below 1.5 V
FANH (A9-22) - E1 (B30-104) W - BR Fan No. 2 relay Idling with high engine coolant temperature Below 1.5 V
ALT (B30-50) - E1 (B30-104) B - BR Generator Ignition switch ON 9 to 14 V
CANH (A9-41) - E1 (B30-104) Y - BR CAN communication line Ignition switch ON Pulse generation (see  12waveform 12)
CANL (A9-49) - E1 (B30-104) W - BR CAN communication line Ignition switch ON Pulse generation (see  13waveform 13)
VCIB (B30-69) - EIB (B30-92) R - BR Battery current sensor Ignition switch ON 4.5 to 5.5 V
IB (B30-68) - EIB (B30-92) B - BR Battery current sensor Ignition switch ON 0.5 to 2.5 V
THB (B30-120) - EIB (B30-92) LG - BR Battery temperature sensor Ignition switch ON, Battery temperature -30 to 80°C (-22 to 176°F) 0.5 to 4.5 V
RLO (B30-51) - E1 (B30-104) GR - BR Generator After engine warmed up, during charging control, vehicle driven at constant speed Pulse generation (see  14waveform 14)
RLO (B30-51) - E1 (B30-104) GR - BR Generator After engine warmed up, during charging control, vehicle accelerated Pulse generation (see  15waveform 15)
RLO (B30-51) - E1 (B30-104) GR - BR Generator After engine warmed up, during charging control, vehicle decelerated Pulse generation (see  16waveform 16)
HINT:
*: The ECM terminal voltage is constant regardless of the output voltage from the sensor.
  1. WAVEFORM 1 

    Camshaft timing oil control valve (OCV) 

    WAVEFORM REFERENCE (WAVEFORM 1)

    ECM Terminal Names Between OC1+ and OC1-
    Tester Ranges 5 V/DIV., 1 msec./DIV.
    Conditions Idling
    Fig 2: Waveform Graph (Waveform 1)
    G04828019Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. WAVEFORM 2 

    Heated oxygen sensor 

    WAVEFORM REFERENCE (WAVEFORM 2)

    ECM Terminal Names Between OX1B and EX1B
    Tester Ranges 0.2 V/DIV., 200 msec./DIV.
    Conditions Engine speed maintained at 2,500 rpm for 2 minutes after warming up sensor
    Fig 3: Waveform Graph (Waveform 2)
    G05581432Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

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

  3. WAVEFORM 3 

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

    WAVEFORM REFERENCE (WAVEFORM 3)

    ECM Terminal Names Between #10 (to #40) and E01
    Tester Ranges 20 V/DIV., 20 msec./DIV.
    Conditions Idling
    Fig 4: Waveform Graph (Waveform 3)
    G04828021Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

  4. WAVEFORM 4 

    Knock sensor 

    WAVEFORM REFERENCE (WAVEFORM 4)

    ECM Terminal Names Between KNK1 and EKNK
    Tester Ranges 1 V/DIV., 1 msec./DIV.
    Conditions Engine speed maintained at 4,000 rpm after warming up engine
    Fig 5: Waveform Graph (Waveform 4)
    G04828022Courtesy 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.
  5. WAVEFORM 5 

    Crankshaft position sensor and Camshaft position sensor 

    WAVEFORM REFERENCE (WAVEFORM 5)

    ECM Terminal Names CH1: Between G2+ and G2-
    CH2: Between NE+ and NE-
    Tester Ranges 5 V/DIV., 20 msec./DIV.
    Conditions Idling
    Fig 6: Waveform Graph (Waveform 5)
    G04828023Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

  6. WAVEFORM 6 

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

    WAVEFORM REFERENCE (WAVEFORM 6)

    ECM Terminal Names Between IGT (1 to 4) and E1
    Between IGF1 and E1
    Tester Ranges 2 V/DIV., 20 msec./DIV.
    Conditions Idling
    Fig 7: Waveform Graph (Waveform 6)
    G04828024Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

  7. WAVEFORM 7 

    Purge VSV 

    WAVEFORM REFERENCE (WAVEFORM 7)

    ECM Terminal Names Between PRG and E1
    Tester Ranges 5 V/DIV., 50 msec./DIV.
    Conditions Idling
    Fig 8: Waveform Graph (Waveform 7)
    G04828025Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

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

  8. WAVEFORM 8 

    Vehicle speed signal 

    WAVEFORM REFERENCE (WAVEFORM 8)

    ECM Terminal Names Between SPD and E1
    Tester Ranges 2 V/DIV., 20 msec./DIV.
    Conditions Driving at 20 km/h (12 mph)
    Fig 9: Waveform Graph (Waveform 8)
    G04828026Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The wavelength becomes shorter as the vehicle speed increases.

  9. WAVEFORM 9 

    Throttle actuator positive terminal 

    WAVEFORM REFERENCE (WAVEFORM 9)

    ECM Terminal Names Between M+ and ME01
    Tester Ranges 5 V/DIV., 1 msec./DIV.
    Conditions Idling with warm engine
    Fig 10: Waveform Graph (Waveform 9)
    G04828027Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The duty ratio varies depending on the throttle actuator operation.

  10. WAVEFORM 10 

    Throttle actuator negative terminal 

    WAVEFORM REFERENCE (WAVEFORM 10)

    ECM Terminal Names Between M- and ME01
    Tester Ranges 5 V/DIV., 1 msec./DIV.
    Conditions Idling with warm engine
    Fig 11: Waveform Graph (Waveform 10)
    G04828028Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The duty ratio varies depending on the throttle actuator operation.

  11. WAVEFORM 11 

    Engine speed signal 

    WAVEFORM REFERENCE (WAVEFORM 11)

    ECM Terminal Names Between TACH and E1
    Tester Ranges 5 V/DIV., 10 msec./DIV.
    Conditions Idling
    Fig 12: Waveform Graph (Waveform 11)
    G04828029Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The wavelength becomes shorter as the engine rpm increases.

  12. WAVEFORM 12 

    CAN communication signal 

    WAVEFORM REFERENCE (WAVEFORM 12)

    ECM Terminal Names Between CANH and E1
    Tester Ranges 1 V/DIV., 10 μsec./DIV.
    Conditions Engine stops and ignition switch ON
    Fig 13: Waveform Graph (Waveform 12)
    G04828030Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The waveform varies depending on the CAN communication signal.

  13. WAVEFORM 13 

    CAN communication signal 

    WAVEFORM REFERENCE (WAVEFORM 13)

    ECM Terminal Names Between CANL and E1
    Tester Ranges 1V/DIV., 10 μsec/DIV.
    Conditions Engine stops and ignition switch ON
    Fig 14: Waveform Graph (Waveform 13)
    G04828031Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    The waveform varies depending on the CAN communication signal.

  14. WAVEFORM 14 

    Generator 

    WAVEFORM REFERENCE (WAVEFORM 14)

    ECM Terminal Names Between RLO and E1
    Tester Ranges 2 V/DIV., 50 msec./DIV.
    Conditions After engine warmed up, during charging control, vehicle driven at constant speed
    Fig 15: Waveform Graph (Waveform 14)
    G05183461Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    A constant value is not output, as the duty ratio varies depending on the electrical load and battery condition.

  15. WAVEFORM 15 

    Generator 

    WAVEFORM REFERENCE (WAVEFORM 15)

    ECM Terminal Names Between RLO and E1
    Tester Ranges 2 V/DIV., 50 msec./DIV.
    Conditions After engine warmed up, during charging control, vehicle accelerated
    Fig 16: Waveform Graph (Waveform 15)
    G05183462Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    A constant value is not output, as the duty ratio varies depending on the electrical load and battery condition.

  16. WAVEFORM 16 

    Generator 

    WAVEFORM REFERENCE (WAVEFORM 16)

    ECM Terminal Names Between RLO and E1
    Tester Ranges 2 V/DIV., 50 msec./DIV.
    Conditions After engine warmed up, during charging control, vehicle decelerated
    Fig 17: Waveform Graph (Waveform 16)
    G05183463Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    A constant value is not output, as the duty ratio varies depending on the electrical load and battery condition.

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