SFI SYSTEM TERMINALS OF ECM
Tech Tips
The standard normal voltage, resistance and waveform 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, resistance and waveform for that pair of the terminals, and 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 |
|---|---|---|---|---|
| A50-1 (BATT) - B31-16 (E1) | P - BR | Battery (for measuring battery voltage and for ECM memory) | Always | 11 to 14 V |
| A50-2 (+B) - B31-16 (E1) | B - BR | Power source of ECM | Ignition switch ON | 11 to 14 V |
| A50-3 (+B2) - B31-16 (E1) | B - BR | Power source of ECM | Ignition switch ON | 11 to 14 V |
| A50-9 (STP) - B31-16 (E1) | L - BR | Stop light switch assembly signal | Brake pedal depressed | 7.5 to 14 V |
| Brake pedal released | Below 1.5 V | |||
| A50-10 (ST1-) - B31-16 (E1) | R - BR | Stop light switch assembly signal (opposite to voltage at STP terminal) |
Ignition switch ON, Brake pedal depressed | Below 1.5 V |
| Ignition switch ON, Brake pedal released | 7.5 to 14 V | |||
| A50-12 (CANP)*6 - B31-16 (E1) | B - BR | CAN communication line | Ignition switch ON | Pulse generation (See waveform 1) |
| A50-13 (CANH) - B31-16 (E1) | B - BR | CAN communication line | Ignition switch ON | Pulse generation (See waveform 1) |
| A50-17 (ELS2) - B31-16 (E1) | L - BR | Electric load signal | Defogger switch on | 11 to 14 V |
| Defogger switch off | Below 1.5 V | |||
| A50-21 (FC)*2 - B31-16 (E1) | R - BR | Fuel pump control | Ignition switch ON | 11 to 14 V |
| Idling | Below 1.5 V | |||
| A50-21 (FPC)*3 - B31-16 (E1) | V - BR | Fuel pump control | Engine stopped, ignition switch ON | Below 1.5 V |
| A50-22 (STA) - B31-16 (E1) | LG - BR | Starter assembly signal | Cranking | 6 V or higher |
| A50-23 (TC) - B31-16 (E1) | P - BR | Terminal TC of DLC3 | Ignition switch ON | 11 to 14 V |
| A50-25 (CANN)*6 - B31-16 (E1) | SB - BR | CAN communication line | Ignition switch ON | Pulse generation (See waveform 2) |
| A50-26 (CANL) - B31-16 (E1) | W - BR | CAN communication line | Ignition switch ON | Pulse generation (See waveform 2) |
| A50-27 (W) - B31-16 (E1) | LG - BR | Malfunction Indicator Lamp (MIL) operation signal | Ignition switch ON (MIL goes off) | Below 1.5 V |
| Idling | 11 to 14 V | |||
| A50-30 (NEO)*4 - B31-16 (E1) | L - BR | Crankshaft position sensor signal sent to certification ECU (smart key ECU assembly) | Idling with warm engine | Pulse generation (See waveform 3) |
| A50-31 (TACH) - B31-16 (E1) | GR - BR | Engine speed signal | Idling | Pulse generation (See waveform 4) |
| A50-37 (IGSW) - B31-16 (E1) | B - BR | Ignition switch signal | Ignition switch ON | 11 to 14 V |
| A50-44 (SPD) - B31-16 (E1) | V - BR | Vehicle speed signal from combination meter assembly signal | Driving at 20 km/h (12 mph) | Pulse generation (See waveform 5) |
| A50-45 (RFC) - B31-16 (E1) | R - BR | Cooling fan control signal | Ignition switch ON, A/C switch on (max cool) | Pulse generation (See waveform 6) |
| A50-46 (MREL) - B31-16 (E1) | L - BR | EFI-MAIN relay operation signal | Ignition switch ON | 11 to 14 V |
| A50-50 (EC) - Body ground | BR - Body ground | Earth (ground) circuit of ECM | Always | Below 1 Ω |
| A50-51 (VPA) - A50-52 (EPA) | W - Y | Accelerator pedal position sensor signal (for engine control) | Ignition switch ON, accelerator pedal fully released | 0.5 to 1.1 V |
| Ignition switch ON, accelerator] pedal fully depressed | 2.6 to 4.5 V | |||
| A50-53 (VCPA) - A50-52 (EPA) | B - Y | Power source of accelerator pedal position sensor (for VPA) | Ignition switch ON | 4.5 to 5.5 V |
| A50-54 (VPA2) - A50-55 (EPA2) | R - P | Accelerator pedal position sensor signal (for sensor malfunctioning detection) | Ignition switch ON, accelerator pedal fully released | 1.2 to 2.0 V |
| Ignition switch ON, Accelerator pedal fully depressed | 3.4 to 4.75 V | |||
| A50-56 (VCP2) - A50-55 (EPA2) | L - P | Power source of accelerator pedal position sensor (for VPA2) | Ignition switch ON | 4.5 to 5.5 V |
| B31-16 (E1) - Body ground | BR - Body ground | Earth (ground) circuit of ECM | Always | Below 1 Ω |
| B31-17 (#20) - B31-51 (E01) | Y - W-B | No. 2 fuel injector assembly signal | Ignition switch ON | 11 to 14 V |
| Idling | Pulse generation (See waveform 7) |
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| B31-18 (#30) - B31-51 (E01) | G - W-B | No. 3 fuel injector assembly signal | Ignition switch ON | 11 to 14 V |
| Idling | Pulse generation (See waveform 7) |
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| B31-19 (#40) - B31-51 (E01) | W - W-B | No. 4 fuel injector assembly signal | Ignition switch ON | 11 to 14 V |
| Idling | Pulse generation (See waveform 7) |
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| B31-20 (#10) - B31-51 (E01) | B - W-B | No. 1 fuel injector assembly signal | Ignition switch ON | 11 to 14 V |
| Idling | Pulse generation (See waveform 7) |
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| B31-21 (E02) - Body ground | W-B - Body ground | Earth (ground) circuit of ECM | Always | Below 1 Ω |
| B31-22 (HT1B) - B31-16 (E1) | L - BR | Heated oxygen sensor heater operation signal | Ignition switch ON | 11 to 14 V |
| Idling | Below 3.0 V | |||
| B31-23 (HA1A) - B31-52 (E04) | R - W-B | Air fuel ratio sensor heater operation signal | Ignition switch ON | 11 to 14 V |
| Idling | Pulse generation (See waveform 8) |
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| B31-29 (+BM) - B31-16 (E1) | B - BR | Power source of throttle actuator | Always | 11 to 14 V |
| B31-30 (M-) - B31-59 (ME01) | P - W-B | Throttle actuator operation signal (negative signal) | Idling with warm engine | Pulse generation (See waveform 9) |
| B31-49 (SDWN) - B31-16 (E1) | R - BR | Continuously variable valve lift controller assembly signal | Ignition switch ON | 5.4 to 8.6 V |
| B31-50 (ACIS) - B31-16 (E1) | Y - BR | Duty vacuum switching valve (for acoustic control induction system) operation signal | Ignition switch ON | 11 to 14 V |
| B31-51 (E01) - Body ground | W-B - Body ground | Earth (ground) circuit of ECM | Always | Below 1 Ω |
| B31-52 (E04) - Body ground | W-B - Body ground | Earth (ground) circuit of ECM | Always | Below 1 Ω |
| B31-54 (IGT4) - B31-16 (E1) | W - BR | No. 4 ignition coil assembly signal (ignition signal) |
Idling | Pulse generation (See waveform 10) |
| B31-55 (IGT3) - B31-16 (E1) | G - BR | No. 3 ignition coil assembly signal (ignition signal) |
Idling | Pulse generation (See waveform 10) |
| B31-56 (IGT2) - B31-16 (E1) | B - BR | No. 2 ignition coil assembly signal (ignition signal) |
Idling | Pulse generation (See waveform 10) |
| B31-57 (IGT1) - B31-16 (E1) | R - BR | No. 1 ignition coil assembly signal (ignition signal) |
Idling | Pulse generation (See waveform 10) |
| B31-58 (GE01) - Body ground | BR - Body ground | Shielded earth (ground) circuit of throttle actuator | Always | Below 1 Ω |
| B31-59 (ME01) - Body ground | W-B - Body ground | Earth (ground) circuit of ECM | Always | Below 1 Ω |
| B31-60 (M+) - B31-59 (ME01) | V - W-B | Throttle actuator operation signal (positive terminal) | Idling with warm engine | Pulse generation (See waveform 11) |
| B31-61 (CAN+) - B31-16 (E1) | B - BR | CAN communication line | Ignition switch ON | Pulse generation (See waveform 1) |
| B31-62 (CAN-) - B31-16 (E1) | GR - BR | CAN communication line | Ignition switch ON | Pulse generation (See waveform 2) |
| B31-63 (NSW)*5 - B31-16 (E1) | W - BR | Park/Neutral position switch assembly signal | Ignition switch ON, shift lever not in P or N | 11 to 14 V |
| Ignition switch ON, shift lever in P or N | Below 3.0 V | |||
| B31-65 (OE1+) - B31-64 (OE1-) | G - P | Camshaft timing oil control valve assembly (for exhaust camshaft) operation signal | Idling | Pulse generation (See waveform 12) |
| B31-75 (OC1+) - B31-74 (OC1-) | B - Y | Camshaft timing oil control valve assembly (for intake camshaft) operation signal | Idling | Pulse generation (See waveform 13) |
| B31-76 (PRG) - B31-16 (E1) | L - BR | Purge VSV operation signal | Ignition switch ON | 11 to 14 V |
| Idling, under purge control | Pulse generation (See waveform 14) |
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| B31-78 (NE+) - B31-110 (NE-) | R - G | Crankshaft position sensor signal | Idling with warm engine | Pulse generation (See waveform 15) |
| B31-80 (EV1+) - B31-112 (EV1-) | P - B | Camshaft position sensor (for exhaust camshaft) signal | Idling with warm engine | Pulse generation (See waveform 16) |
| B31-82 (VV1+) - B31-114 (VV1-) | B - P | Camshaft position sensor (for intake camshaft) signal | Idling with warm engine | Pulse generation (See waveform 16) |
| B31-83 (VTA2) - B31-116 (ETA) | R - L | Throttle position sensor signal (for sensor malfunction detection) | Ignition switch ON, accelerator pedal fully released | 2.1 to 3.1 V |
| Ignition switch ON, accelerator pedal fully depressed | 4.6 to 5.0 V | |||
| B31-84 (VTA1) - B31-116 (ETA) | LG - L | Throttle position sensor signal (for engine control) | Ignition switch ON, accelerator pedal fully released | 0.5 to 1.1 V |
| Ignition switch ON, accelerator pedal fully depressed | 3.2 to 4.8 V | |||
| B31-87 (PIM) - B31-119 (EPIM) | V - Y | Manifold absolute pressure sensor signal | Ignition switch ON | 3.0 to 5.25 V |
| B31-90 (THA) - B31-122 (ETHA) | L - W | Intake air temperature sensor signal | Idling, intake air temperature 20°C (68°F) | 0.5 to 3.4 V |
| B31-91 (VG) - B31-92 (E2G) | V - B | Mass air flow meter sub-assembly signal | Idling, shift lever in P or N (neutral), A/C switch off | 0.5 to 3.0 V |
| B31-93 (THW) - B31-94 (ETHW) | B - BR | Engine coolant temperature sensor signal | Idling, engine coolant temperature 80°C (176°F) | 0.2 to 1.0 V |
| B31-100 (ALT)*7 - B31-16 (E1) | L - BR | Generator assembly signal | Ignition switch ON | 11 to 14 V |
| B31-102 (IGF1) - B31-16 (E1) | Y - BR | Ignition coil assembly (ignition confirmation signal) |
Ignition switch ON | 4.5 to 5.5 V |
| Idling | Pulse generation (See waveform 10) |
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| B31-103 (OX1B) - B31-135 (EX1B) | B - Y | Heated oxygen sensor signal | Engine speed maintained at 2500 rpm for 2 minutes after warming up engine | Pulse generation (See waveform 17) |
| B31-111 (VCE1) - B31-16 (E1) | W - BR | Power source of camshaft position sensor (for exhaust camshaft) (specific voltage) | Ignition switch ON | 4.5 to 5.5 V |
| B31-113 (VCV1) - B31-16 (E1) | W - BR | Power source of camshaft position sensor (for intake camshaft) (specific voltage) | Ignition switch ON | 4.5 to 5.5 V |
| B31-115 (VCTA) - B31-116 (ETA) | G - L | Power source of throttle position sensor (specific voltage) | Ignition switch ON | 4.5 to 5.5 V |
| B31-118 (VCPM) - B31-119 (EPIM) | R - Y | Power source of manifold absolute pressure sensor | Ignition switch ON | 4.75 to 5.25 V |
| B31-123 (KNK1) - B31-124 (EKNK) | B - W | Knock control sensor signal | Engine speed maintained at 4000 rpm after warming up engine | Pulse generation (See waveform 18) |
| B31-133 (A1A+) - B31-16 (E1) | Y - BR | Air fuel ratio sensor signal | Ignition switch ON | 3.3 V*1 |
| B31-134 (A1A-) - B31-16 (E1) | L - BR | Air fuel ratio sensor signal | Ignition switch ON | 2.9 V*1 |
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*1: The ECM terminal voltage is constant regardless of the output voltage from the sensor.
*2: w/o fuel pump control ECU assembly
*3: w/ fuel pump control ECU assembly
*4: w/ Entry and Start System
*5: for CVT models
*6: w/ generator control ECU assembly
*7: w/o generator control ECU assembly
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WAVEFORM 1
*a 1 V/DIV. *b 10 μs./DIV. CAN Communication Signal (Reference) ECM Terminal Name Between CANH and E1
Between CAN+ and E1
Between CANP and E1
Tester Range 1 V/DIV., 10 μs./DIV. Condition Ignition switch ON Tech Tips
The waveform varies depending on the CAN communication signal.
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WAVEFORM 2
*a 1 V/DIV. *b 10 μs./DIV. CAN Communication Signal (Reference) ECM Terminal Name Between CANL and E1
Between CAN- and E1
Between CANN and E1
Tester Range 1 V/DIV., 10 μs./DIV. Condition Ignition switch ON Tech Tips
The waveform varies depending on the CAN communication signal.
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WAVEFORM 3
*a 1 V/DIV. *b 2 ms./DIV. Crankshaft Position Sensor Signal ECM Terminal Name Between NEO and E1 Tester Range 1 V/DIV., 2 ms./DIV. Condition Idling with warm engine -
WAVEFORM 4
*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.
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WAVEFORM 5
*a 5 V/DIV. *b 20 ms./DIV. Vehicle Speed Signal ECM Terminal Name Between SPD and E1 Tester Range 5 V/DIV., 20 ms./DIV. Condition Driving at 20 km/h (12 mph) Tech Tips
The wavelength becomes shorter as the vehicle speed increases.
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WAVEFORM 6
*a 1 V/DIV. *b 2 ms./DIV. Cooling Fan Control Signal ECM Terminal Name Between RFC and E1 Tester Range 1 V/DIV., 2 ms./DIV. Condition Ignition switch ON, A/C switch on (max cool) Tech Tips
The duty ratio varies depending on the engine coolant temperature.
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WAVEFORM 7
*1 20 V/DIV. *2 20 ms./DIV. No. 1 (to No. 4) Fuel Injector Assembly Signal ECM Terminal Name Between #10 (to #40) and E01 Tester Range 20 V/DIV., 20 ms./DIV. Condition Idling Tech Tips
The wavelength becomes shorter as the engine speed increases.
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WAVEFORM 8
*a 5 V/DIV. *b 10 ms./DIV. Air Fuel Ratio Sensor Heater Operation Signal ECM Terminal Name Between HA1A and E04 Tester Range 5 V/DIV., 10 ms./DIV. Condition Idling -
WAVEFORM 9
*a 5 V/DIV. *b 1 ms./DIV. Throttle Actuator Negative Terminal Signal 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.
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WAVEFORM 10
*a 2 V/DIV. *b 20 ms./DIV. Ignition Coil Assembly Signal (IGT and IGF Signal) ECM Terminal Name CH1: Between IGT (1 to 4) and E1
CH2: Between IGF1 and E1
Tester Range 2 V/DIV., 20 ms./DIV. Condition Idling Tech Tips
The wavelength becomes shorter as the engine speed increases.
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WAVEFORM 11
*a 5 V/DIV. *b 1 ms./DIV. Throttle Actuator Positive Terminal Signal 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.
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WAVEFORM 12
*a 5 V/DIV. *b 1 ms./DIV. Camshaft Timing Oil control Valve Assembly (for Exhaust Camshaft) Signal ECM Terminal Name Between OE1+ and OE1- Tester Range 5 V/DIV., 1 ms./DIV. Condition Idling -
WAVEFORM 13
*a 5 V/DIV. *b 1 ms./DIV. Camshaft Timing Oil Control Valve Assembly (for Intake Camshaft) Signal ECM Terminal Name Between OC1+ and OC1- Tester Range 5 V/DIV., 1 ms./DIV. Condition Idling -
WAVEFORM 14
*1 10 V/DIV. *2 20 ms./DIV. Purge VSV Operation Signal ECM Terminal Name Between PRG and E1 Tester Range 10 V/DIV., 20 ms./DIV. Condition Idling, under purge control Tech Tips
If the waveform is not similar to the illustration, check the waveform again after idling for 10 minutes or more.
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WAVEFORM 15
*a 5 V/DIV. *b 20 ms./DIV. Crankshaft Position Sensor Signal ECM Terminal Name Between NE+ and NE- Tester Range 5 V/DIV., 20 ms./DIV. Condition Idling with warm engine Tech Tips
The wavelength becomes shorter as the engine speed increases.
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WAVEFORM 16
*a 5 V/DIV. *b 20 ms./DIV. Camshaft Position Sensor Signal ECM Terminal Name CH1: Between VV1+ and VV1-
CH2: Between EV1+ and EV1-
Tester Range 5 V/DIV., 20 ms./DIV. Condition Idling with warm engine Tech Tips
The wavelength becomes shorter as the engine speed increases.
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WAVEFORM 17
*1 0.2 V/DIV. *2 200 ms./DIV. Heated Oxygen Sensor Signal ECM Terminal Name Between OX1B and EX1B 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 the Data List, the items O2S B1S2 show the values input to the ECM from the heated oxygen sensor.
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WAVEFORM 18
*a 1 V/DIV. *b 1 ms./DIV. Knock Control Sensor Signal ECM Terminal Name Between KNK1 and EKNK Tester Range 1 V/DIV., 1 ms./DIV. Condition Engine speed maintained at 4000 rpm after warming up engine Tech Tips
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The wavelength becomes shorter as the engine speed increases.
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The waveforms and amplitudes displayed differ slightly depending on the vehicle.
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