SFI SYSTEM TERMINALS OF ECM

A000R7HE03

Tech Tips

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 terminals, displayed in the Specified Condition column. The illustration above can be used as a reference to identify the ECM terminal locations.

Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
A20-1 (BATT) - F5-49 (E1) L - BR Auxiliary battery (for measuring auxiliary battery voltage and for ECM memory) Always 11 to 14 V
F5-60 (+BM) - F5-49 (E1) R - BR Power source of throttle motor Always 11 to 14 V
A20-32 (IGSW) - F5-49 (E1) L - BR Power switch Power switch on (IG) 11 to 14 V
A20-2 (+B) - F5-49 (E1) W - BR Power source of ECM Power switch on (IG) 11 to 14 V
A20-3 (+B2) - F5-49 (E1) P - BR Power source of ECM Power switch on (IG) 11 to 14 V
F5-35 (OC1+) - F5-5 (OC1-) W - Y Camshaft timing oil control valve (OCV) (Intake side bank 1) Idling

Pulse generation

(see waveform 1)
F5-34 (OC2+) - F5-4 (OC2-) LG - L Camshaft timing oil control valve (OCV) (Intake side bank 2) Idling

Pulse generation

(see waveform 1)
F5-33 (OE1+) - F5-3 (OE1-) LG - L-W Camshaft timing oil control valve (OCV) (Exhaust side bank 1) Idling

Pulse generation

(see waveform 1)
F5-32 (OE2+) - F5-2 (OE2-) R-B - G-B Camshaft timing oil control valve (OCV) (Exhaust side bank 2) Idling

Pulse generation

(see waveform 1)
A20-46 (MREL) - F5-49 (E1) Y - BR EFI MAIN1 relay Power switch on (IG) 11 to 14 V
F5-126 (VCTA) - F5-125 (ETA) G - R Power source of throttle position sensor (specific voltage) Power switch on (IG) 4.5 to 5.5 V
F5-98 (VG) - F5-130 (E2G) G-B - B-W Mass air flow meter Idling, Shift lever position P or N, A/C switch OFF 0.5 to 3.0 V
F5-96 (THA) - F5-129 (ETHA) G - BR Intake air temperature sensor Idling, Intake air temperature 20°C (68°F) 0.5 to 3.4 V
F5-114 (THW) - F5-122 (ETHW) R - BR Engine coolant temperature sensor Idling, Engine coolant temperature 80°C (176°F) 0.2 to 1.0 V
F5-128 (VTA1) - F5-125 (ETA) W - R Throttle position sensor (for engine control) Accelerator pedal fully released 0.5 to 1.1 V
F5-127 (VTA2) - F5-125 (ETA) L-B - R Throttle position sensor (for sensor malfunction detection) Accelerator pedal fully released 2.1 to 3.1 V
F5-47 (IREL) - F5-49 (E1) B - BR INJ relay Power switch on (IG) 10 to 14 V

F5-26 (HA1A) - F5-27 (E04)

F5-20 (HA2A) - F5-21 (E05)

B - W-B

B - W-B

 A/F sensor heater Idling

Pulse generation

(see waveform 2)

F5-26 (HA1A) - F5-27 (E04)

F5-20 (HA2A) - F5-21 (E05)

B - W-B

B - W-B

 A/F sensor heater Power switch on (IG) 11 to 14 V
F5-100 (A1A+) - F5-49 (E1) R - BR A/F sensor Power switch on (IG) 3.3 V*2
F5-99 (A2A+) - F5-49 (E1) B - BR A/F sensor Power switch on (IG) 3.3 V*2
F5-132 (A1A-) - F5-49 (E1) G - BR A/F sensor Power switch on (IG) 2.9 V*2
F5-131 (A2A-) - F5-49 (E1) W - BR A/F sensor Power switch on (IG) 2.9 V*2

F5-28 (HT1B) - F5-49 (E1)

F5-22 (HT2B) - F5-49 (E1)

Y - BR

B - BR

 Heated oxygen sensor heater Idling Below 3.0 V

F5-28 (HT1B) - F5-49 (E1)

F5-22 (HT2B) - F5-49 (E1)

Y - BR

B - BR

 Heated oxygen sensor heater Power switch on (IG) 11 to 14 V

F5-101 (OX1B) - F5-102 (EX1B)

F5-133 (OX2B) - F5-134 (EX2B)

R - G

G - R

 Heated oxygen sensor Engine speed maintained at 2500 rpm for 2 minutes after warming up engine

Pulse generation

(see waveform 3)

F5-13 (#1) - F5-49 (E1)

F5-15 (#2) - F5-49 (E1)

F5-45 (#3) - F5-49 (E1)

F5-43 (#4) - F5-49 (E1)

F5-75 (#5) - F5-49 (E1)

F5-73 (#6) - F5-49 (E1)

LG - BR

L - BR

R - BR

P - BR

V - BR

W - BR

 Injector for direct injection Power switch on (IG) 0 to 5.0 V

F5-13 (#1) - F5-49 (E1)

F5-15 (#2) - F5-49 (E1)

F5-45 (#3) - F5-49 (E1)

F5-43 (#4) - F5-49 (E1)

F5-75 (#5) - F5-49 (E1)

F5-73 (#6) - F5-49 (E1)

LG - BR

L - BR

R - BR

P - BR

V - BR

W - BR

 Injector for direct injection Idling

Pulse generation

(see waveform 4, 14)

F5-58 (#10) - F5-25 (E01)

F5-54 (#20) - F5-25 (E01)

F5-57 (#30) - F5-25 (E01)

F5-53 (#40) - F5-25 (E01)

F5-56 (#50) - F5-25 (E01)

F5-55 (#60) - F5-25 (E01)

Y - W-B

G - W-B

L - W-B

BR - W-B

R - W-B

R - W-B

 Injector for port injection Power switch on (IG) 0 to 5.0 V

F5-58 (#10) - F5-25 (E01)

F5-54 (#20) - F5-25 (E01)

F5-57 (#30) - F5-25 (E01)

F5-53 (#40) - F5-25 (E01)

F5-56 (#50) - F5-25 (E01)

F5-55 (#60) - F5-25 (E01)

Y - W-B

G - W-B

L - W-B

BR - W-B

R - W-B

R - W-B

 Injector for port injection Idling

Pulse generation

(see waveform 5)
F5-83 (KNK1) - F5-115 (EKNK) B - W Knock sensor Engine speed maintained at 2500 rpm after warming up engine

Pulse generation

(see waveform 6)
F5-84 (KNK2) - F5-116 (EKN2) R - G Knock sensor Engine speed maintained at 2500 rpm after warming up engine

Pulse generation

(see waveform 6)
F5-81 (VV1+) - F5-113 (VV1-) Y - V Variable valve timing (VVT) sensor (Intake side bank 1) Idling

Pulse generation

(see waveform 7)
F5-78 (VV2+) - F5-110 (VV2-) GR - W Variable valve timing (VVT) sensor (Intake side bank 2) Idling

Pulse generation

(see waveform 7)
F5-82 (VCV1) - F5-49 (E1) B - BR Power source of variable valve timing (VVT) sensor (Intake side bank 1) Power switch on (IG) 4.5 to 5.0 V
F5-111 (VCV2) - F5-49 (E1) G - BR Power source of variable valve timing (VVT) sensor (Intake side bank 2) Power switch on (IG) 4.5 to 5.0 V
F5-76 (NE+) - F5-109 (NE-) R - G Crankshaft position sensor Idling

Pulse generation

(see waveform 7, 8)
F5-79 (EV1+) - F5-117 (EV1-) P - LG Variable valve timing (VVT) sensor (Exhaust side bank 1) Idling

Pulse generation

(see waveform 8)
F5-80 (EV2+) - F5-118 (EV2-) G - R Variable valve timing (VVT) sensor (Exhaust side bank 2) Idling

Pulse generation

(see waveform 8)
F5-89 (VCE1) - F5-49 (E1) L - BR Power source of variable valve timing (VVT) sensor (Exhaust side bank 1) Power switch on (IG) 4.5 to 5.5 V
F5-90 (VCE2) - F5-49 (E1) Y - BR Power source of variable valve timing (VVT) sensor (Exhaust side bank 2) Power switch on (IG) 4.5 to 5.5 V

F5-107 (IGT1) - F5-49 (E1)

F5-140 (IGT2) - F5-49 (E1)

F5-106 (IGT3) - F5-49 (E1)

F5-139 (IGT4) - F5-49 (E1)

F5-105 (IGT5) - F5-49 (E1)

F5-138 (IGT6) - F5-49 (E1)

LG - BR

L - BR

V - BR

P - BR

V - BR

W - BR

 Ignition coil (ignition signal) Idling

Pulse generation

(see waveform 9)

F5-103 (IGF1) - F5-49 (E1)

F5-136 (IGF2) - F5-49 (E1)

G - BR

V - BR

 Ignition coil (ignition confirmation signal) Power switch on (IG) 4.5 to 5.5 V

F5-103 (IGF1) - F5-49 (E1)

F5-136 (IGF2) - F5-49 (E1)

G - BR

V - BR

 Ignition coil (ignition confirmation signal) Idling

Pulse generation

(see waveform 9)
F5-48 (PRG) - F5-49 (E1) W - BR Purge VSV Power switch on (IG) 11 to 14 V
F5-48 (PRG) - F5-49 (E1) W - BR Purge VSV Idling

Pulse generation

(see waveform 10)
F5-30 (M+) - F5-59 (ME01) B - W-B Throttle actuator Idling with warm engine

Pulse generation

(see waveform 11)
F5-29 (M-) - F5-59 (ME01) W - W-B Throttle actuator Idling with warm engine

Pulse generation

(see waveform 12)
A20-18 (FPC) - F5-49 (E1) W - BR Fuel pump control Power switch on (IG) Below 1.5 V
A20-45 (TC) - F5-49 (E1) B - BR Terminal TC of DLC3 Power switch on (IG) 11 to 14 V
A20-23 (TACH) - F5-49 (E1) GR - BR Engine speed Idling

Pulse generation

(see waveform 13)
A20-7 (VPMP)*1 - F5-49 (E1) G - BR Vent valve (built into canister pump module) Power switch on (IG) 11 to 14 V
A20-6 (MPMP)*1 - F5-49 (E1) R - BR Leak detection pump (built into canister pump module) Leak detection pump ON 9 to 14 V
A20-42 (PPMP)*1 - F5-49 (E1) LG - BR Canister pressure sensor (built into canister pump module) Power switch on (IG) 3 to 3.6 V
A20-35 (VC)*1 - A20-33 (E2)*1 L - BR Power source of canister pressure sensor (built into canister pump module) Power switch on (IG) 4.5 to 5.5 V
F5-14 (INJ1) - F5-49 (E1) W - BR Injector for direct injection confirmation signal Idling with warm engine

Pulse generation

(see waveform 14)
F5-44 (INJ2) - F5-49 (E1) B - BR Injector for direct injection confirmation signal Idling with warm engine

Pulse generation

(see waveform 14)
F5-74 (INJ3) - F5-49 (E1) Y - BR Injector for direct injection confirmation signal Idling with warm engine

Pulse generation

(see waveform 14)
F5-61 (FPF) - F5-49 (E1) G - BR High pressure side fuel pump (Spill valve) Idling with warm engine

Pulse generation

(see waveform 15)
F5-63 (FPD) - F5-49 (E1) LG - BR High pressure side fuel pump (Spill valve) Idling with warm engine

Pulse generation

(see waveform 15)
F5-86 (PR) - F5-85 (EPR) L-B - BR Fuel pressure sensor Idling 1.0 to 1.7 V
F5-88 (VCPR) - F5-85 (EPR) L - BR Power source of fuel pressure sensor Power switch on (IG) 4.5 to 5.5 V
A20-5 (RFC) - F5-49 (E1) B - BR Cooling fan control signal Power switch on (IG), A/C switch on (Max cool) Pulse generation (See waveform 18)
F5-95 (PIM) - F5-93 (EPIM) Y - BR Manifold absolute pressure sensor Power switch on (IG) 3.0 to 5.0 V
F5-94 (VCPM) - F5-93 (EPIM) BR - BR Manifold absolute pressure sensor Power switch on (IG) 4.75 to 5.25 V
A20-13 (CANH) - F5-49 (E1)

B - BR (for LHD)

G - BR (for RHD)

 CAN communication line Power switch on (IG)

Pulse generation

(see waveform 16)
A20-12 (CANP) - F5-49 (E1) B - BR CAN communication line Power switch on (IG)

Pulse generation

(see waveform 16)
A20-26 (CANL) - F5-49 (E1) W - BR CAN communication line Power switch on (IG)

Pulse generation

(see waveform 17)
A20-25 (CANN) - F5-49 (E1) W - BR CAN communication line Power switch on (IG)

Pulse generation

(see waveform 17)
A20-8 (RTNV) - F5-49 (E1) L - BR Fuel return pipe valve Power switch on (IG) 4.0 to 5.0 V

Tech Tips

*2: The ECM terminal voltage is constant regardless of the output voltage from the sensor.


  1. WAVEFORM 1

    A000QKXE08
    *a 5 V/DIV.
    *b 1 ms./DIV.
    Camshaft Timing Oil Control Valve (OCV)
    ECM Terminal Name

    Between OC1+ and OC1- or OC2+ and OC2-

    Between OE1+ and OE1- or OE2+ and OE2-
    Tester Range 5 V/DIV., 1 ms./DIV.
    Condition Idling

  2. WAVEFORM 2

    A000ORAE01
    *a 5 V/DIV.
    *b 10 ms./DIV.
    Air Fuel Ratio Sensor Heater:
    ECM Terminal Name Between HA1A and E04 or HA2A and E05
    Tester Range 5 V/DIV, 10 ms./DIV
    Condition Idling

    Tech Tips

    The wavelength varies in accordance with the engine operating condition.

  3. WAVEFORM 3

    A000NXGE18
    *1 0.2 V/DIV.
    *2 200 ms./DIV.
    Heated Oxygen Sensor
    ECM Terminal Name Between OX1B and E2 or OX2B and E2
    Tester Range 0.2 V/DIV., 200 ms./DIV.
    Condition Engine speed maintained at 2500 rpm for 2 minutes after warming up engine

    Tech Tips

    In Data List, item O2S B1S2 and O2S B2S2 shows the ECM input values from the heated oxygen sensor.

  4. WAVEFORM 4

    A000R8UE01
    *a 2 V/DIV.
    *b 20 ms./DIV.
    Injector for Direct Injection No. 1 (to No. 6) Injection Signal
    ECM Terminal Name Between #1 (to #6) and E1
    Tester Range 2 V/DIV., 20 ms./DIV.
    Condition Idling

    Tech Tips


    • The wavelength becomes shorter as the engine speed increases.

    • When the direct injection injectors are operating, Direct is displayed for Injection Way of the Data List.

  5. WAVEFORM 5

    A000SNDE05
    *a 20 V/DIV.
    *b 1 ms./DIV.
    Injector for Port Injection No. 1 (to No. 6) Injection Signal:
    ECM Terminal Name Between #10 (to #60) and E01
    Tester Range 20 V/DIV., 1 ms./DIV.
    Condition Idling

    Tech Tips


    • The wavelength becomes shorter as the engine speed increases.

    • When the port injection injectors are operating, Port is displayed for Injection Way of the Data List.

  6. WAVEFORM 6

    A000S5GE01
    *a 1 V/DIV.
    *b 1 ms./DIV.
    Knock Sensor
    ECM Terminal Name

    Between KNK1 and EKNK

    Between KNK2 and EKN2
    Tester Range 1 V/DIV., 1 ms./DIV.
    Condition Engine speed maintained at 4000 rpm after warming up engine

    Tech Tips


    • The wavelength becomes shorter as the engine speed increases.

    • The waveforms and amplitudes displayed differ slightly depending on the vehicle.

  7. WAVEFORM 7

    A000PXYE12
    *a 5 V/DIV.
    *b 20 ms./DIV.
    Crankshaft Position Sensor and VVT Sensor for Intake Camshaft
    ECM Terminal Name

    Between NE+ and NE-

    Between VV1+ and VV1- or VV2+ and VV2-
    Tester Range 5 V/DIV., 20 ms./DIV.
    Condition Idling

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  8. WAVEFORM 8

    A000OTJE07
    *a 5 V/DIV.
    *b 20 ms./DIV. (Idling)
    Crankshaft Position Sensor and VVT Sensor for Exhaust Camshaft
    ECM Terminal Name

    Between NE+ and NE-

    Between EV1+ and EV1- or EV2+ and EV2-
    Tester Range 5 V/DIV., 20 ms./DIV.
    Condition Idling

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  9. WAVEFORM 9

    A000P64E06
    *a 2 V/DIV.
    *b 20 ms./DIV.
    Igniter IGT Signal (from ECM to igniter) and Igniter IGF Signal (from igniter to ECM)
    ECM Terminal Name

    CH1: Between IGT (1 to 6) and E1

    CH2: Between IGF1 and E1 or IGF2 and E1
    Tester Range 2 V/DIV., 20 ms./DIV.
    Condition Idling

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  10. WAVEFORM 10

    A000N2AE10
    *1 10 V/DIV.
    *2 20 msec./DIV.
    Purge VSV
    ECM Terminal Name Between PRG and E1
    Tester Range 10 V/DIV., 20 ms./DIV.
    Condition Idling

    Tech Tips

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

  11. WAVEFORM 11

    A000QXLE03
    *a 5 V/DIV.
    *b 1 ms./DIV.
    Throttle Actuator Positive Terminal
    ECM Terminal Name Between M+ and ME01
    Tester Range 5 V/DIV., 1 ms./DIV.
    Condition Idling with warm engine

    Tech Tips

    The duty ratio varies depending on the throttle actuator operation.

  12. WAVEFORM 12

    A000RD7E01
    *a 5 V/DIV.
    *b 1 ms./DIV.
    Throttle Actuator Negative Terminal
    ECM Terminal Name Between M- and ME01
    Tester Range 5 V/DIV., 1 ms./DIV.
    Condition Idling with warm engine

    Tech Tips

    The duty ratio varies depending on the throttle actuator operation.

  13. WAVEFORM 13

    A000NAWE02
    *a 5 V/DIV.
    *b 10 ms./DIV.
    Engine Speed Signal
    ECM Terminal Name Between TACH and E1
    Tester Range 5 V/DIV., 10 ms./DIV.
    Condition Idling

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  14. WAVEFORM 14

    A000RHAE10
    *a 2 V/DIV.
    *b 20 ms./DIV.
    Injector for Direct Injection No. 1 (to No. 6) Injection Signal and Injection Confirmation Signal
    ECM Terminal Name

    CH1: Between #1 or #4 and E1, CH2: Between INJ1 and E1

    CH1: Between #2 or #5 and E1, CH2: Between INJ2 and E1

    CH1: Between #3 or #6 and E1, CH2: Between INJ3 and E1
    Tester Range 2 V/DIV., 20 ms./DIV.
    Condition Idling with warm engine

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  15. WAVEFORM 15

    A000RQGE01
    *a 2 V/DIV.
    *b 5 ms./DIV.
    Fuel Pump for High Pressure (Spill Valve)
    ECM Terminal Name

    CH1: Between FPD and E1

    CH2: Between FPF and E1
    Tester Range 2 V/DIV., 5 ms./DIV.
    Condition Idling with warm engine

  16. WAVEFORM 16

    A000QONE01
    *a 1 V/DIV.
    *b 10 μs./DIV.
    CAN Communication Signal
    ECM Terminal Name

    Between CANH and E1

    Between CANP and E1
    Tester Range 1 V/DIV., 10 μs/DIV.
    Condition Power switch on (IG)

    Tech Tips

    The waveform varies depending on the CAN communication signal.

  17. WAVEFORM 17

    A000PR6E01
    *a 1 V/DIV.
    *b 10 μs./DIV.
    CAN Communication Signal
    ECM Terminal Name

    Between CANL and E1

    Between CANN and E1
    Tester Range 1 V/DIV., 10 μs/DIV.
    Condition Power switch on (IG)

    Tech Tips

    The waveform varies depending on the CAN communication signal.

  18. WAVEFORM 18

    A000P02E28
    *a 1 V/DIV.
    *b 20 ms./DIV.
    Cooling Fan Control Signal
    ECM Terminal Name Between RFC and E1
    Tester Range 1 V/DIV., 20 ms./DIV.
    Condition Power switch on (IG), A/C switch on (max cool)

    Tech Tips

    The wavelength becomes shorter as the engine coolant temperature.