SFI SYSTEM TERMINALS OF ECM
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 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 No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| A40-20 (BATT) - B39-105 (E1) | P - BR | Battery (for measuring battery voltage and for ECM memory) | Always | 11 to 14 V |
| A40-2 (+B) - B39-105 (E1) | B - BR | Power source of ECM | Ignition switch ON | 11 to 14 V |
| A40-1 (+B2) - B39-105 (E1) | B - BR | Power source of ECM | Ignition switch ON | 11 to 14 V |
| A40-3 (+BM) - B39-105 (E1) | B - BR | Power source of throttle actuator | Always | 11 to 14 V |
| B39-109 (IGT1) - B39-105 (E1) | W-L - BR | Ignition coil (ignition signal) |
Idling | Pulse generation (See waveform 1) |
| B39-108 (IGT2) - B39-105 (E1) | B - BR | |||
| B39-107 (IGT3) - B39-105 (E1) | L-B - BR | |||
| B39-106 (IGT4) - B39-105 (E1) | B - BR | |||
| B39-82 (IGF1) - B39-105 (E1) | Y - BR | Ignition coil (ignition confirmation signal) |
Ignition switch ON | 4.5 to 5.5 V |
| Idling | Pulse generation (See waveform 1) |
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| B39-93 (NE+) - B39-117 (NE-) | B - W | Crankshaft position sensor | Idling with warm engine | Pulse generation (See waveform 2) |
| B39-94 (G2+) - B39-118 (G2-) | G - R | Variable valve timing (VVT) sensor (Intake side) | Idling with warm engine | Pulse generation (See waveform 2) |
| B39-86 (#10) - B39-46 (E01) | V - BR | Injector | Ignition switch ON | 11 to 14 V |
| B39-85 (#20) - B39-46 (E01) | Y - BR | Idling | Pulse generation (See waveform 3) |
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| B39-84 (#30) - B39-46 (E01) | G - BR | |||
| B39-83 (#40) - B39-46 (E01) | LG - BR | |||
| B39-104 (HA1A) - B39-41 (E04) | R - W-B | Air fuel ratio sensor heater (sensor 1) | Ignition switch ON | 11 to 14 V |
| Idling | Pulse generation (See waveform 15) |
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| B39-103 (A1A+) - B39-105 (E1) | L - BR | Air fuel ratio sensor (sensor 1) | Ignition switch ON | 3.0 V*1 |
| B39-126 (A1A-) - B39-105 (E1) | P - BR | Air fuel ratio sensor (sensor 1) | Ignition switch ON | 3.3 V*1 |
| B39-63 (HT1B) - B39-81 (E03) | P - W-B | Heated oxygen sensor heater (sensor 2) | Ignition switch ON | 11 to 14 V |
| Idling | Below 3.0 V | |||
| B39-80 (OX1B) - B39-79 (O1B-) | BR - Y | Heated oxygen sensor (sensor 2) | Engine speed maintained at 2500 rpm for 2 minutes after warming up sensor | Pulse generation (See waveform 4) |
| B39-110 (KNK1) - B39-111 (EKNK) | G - R | Knock sensor | Engine speed maintained at 4000 after warming up engine | Pulse generation (See waveform 5) |
| A40-38 (SPD) - B39-105 (E1) | Y - BR | Speed signal from combination meter | Driving at 20 km/h (12 mph) | Pulse generation (See waveform 6) |
| B39-64 (THW) - B39-65 (ETHW) | B - BR | Engine coolant temperature sensor | Idling, Engine coolant temperature 80°C (176°F) | 0.2 to 1.0 V |
| B39-87 (THA) - B39-88 (ETHA) | P - BR-W | Intake air temperature sensor | Idling, Intake air temperature 20°C (68°F) | 0.5 to 3.4 V |
| B39-69 (VG) - B39-92 (E2G) | V - R | Mass air flow meter | Idling, Shift lever in P or N (for CVT) or neutral (for M/T), air conditioner OFF | 0.5 to 3.0 V |
| A40-24 (W) - B39-105 (E1) | P - BR | MIL | Ignition switch ON (MIL goes off) | Below 3.0 V |
| Idling | 11 to 14 V | |||
| A40-48 (STA) - B39-105 (E1) | LG - BR | Starter signal | Cranking | 5.5 V or higher |
| B39-113 (VTA1) - B39-90 (ETA) | P - 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 | 3.2 to 4.8 V | |||
| B39-112 (VTA2) - B39-90 (ETA) | R - BR | Throttle position sensor (for sensor malfunction detection) | Ignition switch ON, Accelerator pedal released | 2.1 to 3.1 V |
| Ignition switch ON, Accelerator pedal depressed | 4.6 to 5.0 V | |||
| B39-89 (VCTA) - B39-90 (ETA) | V - BR | Power source of sensor (specific voltage) | Ignition switch ON | 4.5 to 5.5 V |
| A40-57 (VCPA) - A40-59 (EPA) | P-L - R | Power source of accelerator pedal position sensor (for VPA) | Ignition switch ON | 4.5 to 5.5 V |
| A40-55 (VPA) - A40-59 (EPA) | L-W - 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 | 2.6 to 4.5 V | |||
| A40-56 (VPA2) - A40-60 (EPA2) | Y - G | 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 | |||
| A40-58 (VCP2) - A40-60 (EPA2) | B - G | Power source of accelerator pedal position sensor (for VPA2) | Ignition switch ON | 4.5 to 5.0 V |
| B39-43 (M+) - B39-44 (ME01) | P - W-B | Throttle actuator | Idling with warm engine | Pulse generation (See waveform 7) |
| B39-42 (M-) - B39-44 (ME01) | L - W-B | Throttle actuator | Idling with warm engine | Pulse generation (See waveform 8) |
| A40-36 (STP) - B39-105 (E1) | V - BR | Stop light switch | Brake pedal depressed | 11 to 14 V |
| Brake pedal released | Below 1.5 V | |||
| A40-35 (ST1-) - B39-105 (E1) | R-L - BR | Stop light switch | Ignition switch ON, Brake pedal depressed | Below 1.5 V |
| Ignition switch ON, Brake pedal released | 11 to 14 V | |||
| B39-62 (PRG) - B39-105 (E1) | L-B - BR | Purge VSV | Ignition switch ON | 11 to 14 V |
| Idling | Pulse generation (See waveform 9) |
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| A40-19 (FC) - B39-105 (E1) | R - BR | Fuel pump control | Ignition switch ON | 11 to 14 V |
| Idling | Below 1.5 V | |||
| A40-15 (TACH) - B39-105 (E1) | GR - BR | Engine speed | Idling | Pulse generation (See waveform 10) |
| A40-41 (TC) - B39-105 (E1) | P - BR | Terminal TC of DLC3 | Ignition switch ON | 11 to 14 V |
| B39-74 (OC1+) - B39-96 (OC1-) | B - V | Camshaft timing oil control valve (Intake side) | Idling | Pulse generation (See waveform 11) |
| A40-8 (CANH) - B39-105 (E1) | Y - BR | CAN communication line | Ignition switch ON | Pulse generation (See waveform 12) |
| A40-9 (CANL) - B39-105 (E1) | W - BR | CAN communication line | Ignition switch ON | Pulse generation (See waveform 13) |
| A40-27 (IGSW) - B39-105 (E1) | B - BR | Ignition switch | Ignition switch ON | 11 to 14 V |
| A40-44 (MREL) - B39-105 (E1) | W - BR | EFI MAIN relay | Ignition switch ON | 11 to 14 V |
| B39-75 (OE1+) - B39-97 (OE1-) | BR - P | Camshaft timing oil control valve (Exhaust side) | Idling | Pulse generation (See waveform 14) |
| B39-98 (EV1+) - B39-120 (EV1-) | L - R | Variable valve timing (VVT) sensor (Exhaust side) | Idling with warm engine | Pulse generation (See waveform 2) |
| B39-119 (VCV1) - B39-105 (E1) | W - BR | Power source for VVT sensor (specific voltage) | Ignition switch ON | 4.5 to 5.5 V |
| B39-121 (VCE1) - B39-105 (E1) | W - BR | Power source for VVT sensor (specific voltage) | Ignition switch ON | 4.5 to 5.5 V |
| A40-43 (RFC) - B39-105 (E1) | R-G - BR | Cooling fan control | Ignition switch ON | 4.5 to 5.5 V |
| B39-38 (ACIS) - B39-105 (E1) | R-B - BR | Intake air control valve actuator | Ignition switch ON | 11 to 14 V |
| B39-67 (VCPM) - B39-105 (E1)*2 | R - BR | Power source for oil pressure sensor (specific voltage) | Ignition switch ON | 4.5 to 5.5 V |
| B39-114 (PIM) - B39-91 (EPIM)*2 | V - BR-R | Oil pressure sensor | Idling and shift lever in P | 0.8 to 1.2 V |
| A40-39 (NEO) - B39-105 (E1)*3 | R - BR | Engine speed signal to power management control ECU | Idling with warm engine | Pulse generation (See waveform 16) |
| A40-25 (NSW) - B39-105 (E1)*2 | G - BR | Park/neutral position switch | Ignition switch ON, shift lever in P or N | Below 1.5 V |
| Ignition switch ON, shift lever not in P or N | 6.0 V or higher | |||
| B39-52 (ALT) - B39-105 (E1) | L - BR | Generator | Ignition switch ON | 11 to 14 V |
| A40-37 (SDWN) - B39-105 (E1) | G - BR | Continuously variable valve lift controller | Ignition switch ON | 11 to 14 V |
| A40-4 (CAN+) - B39-105 (E1) | Y - BR | CAN communication line | Ignition switch ON | Pulse generation (See waveform 12) |
| A40-5 (CAN-) - B39-105 (E1) | W - BR | CAN communication line | Ignition switch ON | Pulse generation (See waveform 13) |
| A40-6 (CANP) - B39-105 (E1) | W - BR | CAN communication line | Ignition switch ON | Pulse generation (See waveform 12) |
| A40-7 (CANN) - B39-105 (E1) | R - BR | CAN communication line | Ignition switch ON | Pulse generation (See waveform 13) |
| B39-76 (R) - B39-105 (E1)*4 | R - BR | Back-up light switch | Ignition switch ON and shift lever in R | 11 to 14 V |
| Ignition switch ON and shift lever not in R | Below 1 V |
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*1: The ECM terminal voltage is constant regardless of the output voltage from the sensor.
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*2: for CVT
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*3: w/ Entry and Start System
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*4: for M/T
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WAVEFORM 1
*a 2 V/DIV. *b IGT1 to 4 *c 20 ms./DIV. Igniter IGT signal (from ECM to igniter) ECM Terminal Name Between IGT (1 to 4) and E1
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 2
*a 5 V/DIV. *b 20 ms./DIV. Crankshaft position sensor and Variable valve timing (VVT) sensor ECM Terminal Name Between G2+ and G2-
Between EV1+ and EV1-
Between NE+ and NE-
Tester Range 5 V/DIV., 20 ms./DIV. Condition Idle after engine warmed-up Tech Tips
The wavelength becomes shorter as the engine speed increases.
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WAVEFORM 3
*1 20 V/DIV. *2 20 ms./DIV. Injector No. 1 (to No. 4) injector 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 4
*1 0.2 V/DIV. *2 200 ms./DIV. Heated oxygen sensor (bank 1 sensor 2) ECM Terminal Name Between OX1B and O1B- Tester Range 0.2 V/DIV., 200 ms./DIV. Condition Maintain engine speed at 2500 rpm for 2 minutes after warming up sensor Tech Tips
In the Data List, the items O2S B1 S2 show the values input to the ECM from the heated oxygen sensor.
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WAVEFORM 5
*a 1 V/DIV. *b 1 ms./DIV. Knock sensor ECM Terminal Name Between KNK1 and EKNK Tester Range 1 V/DIV., 1 ms./DIV. Condition Maintain engine speed at 4000 rpm after engine warmed-up 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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WAVEFORM 6
*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 7
*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 Idle after engine warmed-up Tech Tips
The duty ratio varies depending on the throttle actuator operation.
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WAVEFORM 8
*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 Idle after engine warmed-up Tech Tips
The duty ratio varies depending on the throttle actuator operation.
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WAVEFORM 9
*1 10 V/DIV. *2 20 ms./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.
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WAVEFORM 10
*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 11
*a 5 V/DIV. *b 1 ms./DIV. Camshaft timing oil control valve for intake camshaft ECM Terminal Name Between OC1+ and OC1- Tester Range 5 V/DIV., 1 ms./DIV. Condition Idling -
WAVEFORM 12
*a 1 V/DIV. *b 10 μsec./DIV. CAN communication signal ECM Terminal Name Between CANH and E1
Between CAN+ and E1
Between CANP and E1
Tester Range 1 V/DIV., 10 μsec./DIV. Condition Engine stop and ignition switch ON Tech Tips
The waveform varies depending on the CAN communication signal.
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WAVEFORM 13
*a 1 V/DIV. *b 10 μsec./DIV. CAN communication signal ECM Terminal Name Between CANL and E1
Between CAN- and E1
Between CANN and E1
Tester Range 1 V/DIV., 10 μsec./DIV. Condition Engine stop and ignition switch ON Tech Tips
The waveform varies depending on the CAN communication signal.
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WAVEFORM 14
*a 5 V/DIV. *b 1 ms./DIV. Camshaft timing oil control valve for exhaust camshaft ECM Terminal Name Between OE1+ and OE1- Tester Range 5 V/DIV., 1 ms./DIV. Condition Idling -
WAVEFORM 15
*a 5 V/DIV. *b 10 ms./DIV. A/F sensor heater ECM Terminal Name Between HA1A and E04 Tester Range 5 V/DIV., 10 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 1 V/DIV. Engine speed signal ECM Terminal Name Between NEO and E1 Tester Range 1 V/DIV., 2 ms./DIV. Condition Idling with warm engine