SFI SYSTEM TERMINALS OF ECM
Tech Tips
The standard 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 voltage 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 |
|---|---|---|---|---|
| A18-20 (BATT) - B8-105 (E1) | B - BR | Battery (for measuring battery voltage and for ECM memory) | Always | 11 to 14 V |
| A18-2 (+B) - B8-105 (E1) | W - BR | Power source of ECM | Ignition switch ON | 11 to 14 V |
| A18-1 (+B2) - B8-105 (E1) | L - BR | Power source of ECM | Ignition switch ON | 11 to 14 V |
| A18-3 (+BM) - B8-105 (E1) | R-W - BR | Power source of throttle actuator | Always | 11 to 14 V |
| B8-109 (IGT1) - B8-105 (E1) | W - BR | Ignition coil (ignition signal) |
Idling | Pulse generation (see waveform 1) |
| B8-108 (IGT2) - B8-105 (E1) | L - BR | |||
| B8-107 (IGT3) - B8-105 (E1) | GR - BR | |||
| B8-106 (IGT4) - B8-105 (E1) | P - BR | |||
| B8-82 (IGF1) - B8-105 (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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| B8-116 (VCNE) - B8-105 (E1) | P - BR | Power source of crankshaft position sensor | Ignition switch ON | 4.5 to 5.5 V |
| B8-93 (NE+) - B8-117 (NE-) | L - V | Crankshaft position sensor | Idling with warm engine | Pulse generation (see waveform 2) |
| B8-119 (VCV1) - B8-105 (E1) | L - BR | Power source for camshaft position sensor (for intake camshaft) | Ignition switch ON | 4.5 to 5.5 V |
| B8-121 (VCE1) - B8-105 (E1) | G - BR | Power source for camshaft position sensor (for exhaust camshaft) | Ignition switch ON | 4.5 to 5.5 V |
| B8-94 (G2+) - B8-118 (G2-) | W - Y | Camshaft position sensor (for intake camshaft) | Idling with warm engine | Pulse generation (see waveform 3) |
| B8-98 (EV1+) - B8-120 (EV1-) | B - R | Camshaft position sensor (for exhaust camshaft) | Idling with warm engine | Pulse generation (see waveform 3) |
| B8-86 (#10) - B8-46 (E01) | LG - W-B | Fuel injector | Ignition switch ON | 11 to 14 V |
| B8-85 (#20) - B8-46 (E01) | P - W-B | |||
| B8-84 (#30) - B8-46 (E01) | V - W-B | Idling | Pulse generation (see waveform 4) |
|
| B8-83 (#40) - B8-46 (E01) | R - W-B | |||
| B8-104 (HA1A) - B8-41 (E04) | B - W-B | Air fuel ratio sensor (bank 1 sensor 1) heater | Ignition switch ON | 11 to 14 V |
| Idling with warm engine | Pulse generation (see waveform 5) |
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| B8-103 (A1A+) - B8-105 (E1) | L - BR | Air fuel ratio sensor (bank 1 sensor 1) | Idling | Below 3.3 V*1 |
| B8-126 (A1A-) - B8-105 (E1) | G - BR | Air fuel ratio sensor (bank 1 sensor 1) | Idling | Below 2.9 V*1 |
| B8-63 (HT1B) - B8-81 (E03) | B - W-B | Heated oxygen sensor (bank 1 sensor 2) heater | Ignition switch ON | 11 to 14 V |
| Idling | Below 3.0 V | |||
| B8-80 (OX1B) - B8-79 (O1B-) | G - R | Heated oxygen sensor (bank 1 sensor 2) | Engine speed maintained at 2500 rpm for 2 minutes after warming up sensor | Pulse generation (see waveform 6) |
| B8-110 (KNK1) - B8-111 (EKNK) | B - W | Knock sensor | Engine speed maintained at 4000 after warming up engine | Pulse generation (see waveform 7) |
| A18-38 (SPD) - B8-105 (E1) | R-B - BR | Speed signal from combination meter | Rotate driving wheel slowly | Pulse generation (see waveform 8) |
| B8-64 (THW) - B8-65 (ETHW) | LG - P | Engine coolant temperature sensor | Idling, Engine coolant temperature 80°C (176°F) | 0.2 to 1.0 V |
| B8-87 (THA) - B8-88 (ETHA) | W-L - LG-B | Intake air temperature sensor (built into mass air flow meter) | Idling, Intake air temperature 20°C (68°F) | 0.5 to 3.4 V |
| B8-69 (VG) - B8-92 (E2G) | B-W - L-W | Mass air flow meter | Idling, Shift lever position neutral, air conditioner OFF | 0.5 to 3.0 V |
| B8-67 (VCPM) - B8-91 (EPIM) | LG-R - G-R | Power source of manifold absolute pressure sensor | Ignition switch ON | 4.5 to 5.5 V |
| B8-114 (PIM) - B8-91 (EPIM) | L-Y - G-R | Manifold absolute pressure sensor | Idling | 1.2 to 2.0 V |
| A18-24 (W) - B8-105 (E1) | P-B - BR | MIL | Ignition switch ON (MIL goes on) | Below 3.0 V |
| Idling | 11 to 14 V | |||
| A18-48 (STA) - B8-105 (E1) | W-R - BR | Starter signal | Ignition switch ON | Below 1.5 V |
| Cranking | 11 to 14 V | |||
| A18-25 (NSW) - B8-105 (E1) | GR - BR | Clutch start switch signal*2 Park/Neutral position switch signal*3 |
Ignition switch ON, Clutch pedal fully depressed*2 | Below 1.5 V |
| Ignition switch ON, Clutch pedal released*2 | 11 to 14 V | |||
| Ignition switch ON, shift lever in P, N*3 | Below 1.5 V | |||
| Ignition switch ON, shift lever not in P, N*3 | 11 to 14 V | |||
| Cranking | 11 to 14 V | |||
| B8-113 (VTA1) - B8-90 (ETA) | W - B | 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 | |||
| B8-112 (VTA2) - B8-90 (ETA) | GR - B | 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 | 4.5 to 5.5 V | |||
| B8-89 (VCTA) - B8-90 (ETA) | Y - B | Power source of sensor (specific voltage) | Ignition switch ON | 4.5 to 5.5 V |
| A18-57 (VCPA) - A18-59 (EPA) | G-R - LG | Power source of accelerator pedal position sensor (for VPA) | Ignition switch ON | 4.5 to 5.5 V |
| A18-55 (VPA) - A18-59 (EPA) | LG-R - LG | 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 | |||
| A18-56 (VPA2) - A18-60 (EPA2) | V-Y - V | 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 4.75 V | |||
| A18-58 (VCP2) - A18-60 (EPA2) | L-W - V | Power source of accelerator pedal position sensor (for VPA2) | Ignition switch ON | 4.5 to 5.5 V |
| B8-43 (M+) - B8-44 (ME01) | G - BR | Throttle actuator | Idling with warm engine | Pulse generation (see waveform 9) |
| B8-42 (M-) - B8-44 (ME01) | R - BR | Throttle actuator | Idling with warm engine | Pulse generation (see waveform 10) |
| A18-36 (STP) - B8-105 (E1) | Y - BR | Stop light switch | Brake pedal depressed | 11 to 14 V |
| Brake pedal released | Below 1.5 V | |||
| A18-35 (ST1-) - B8-105 (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 | |||
| B8-62 (PRG) - B8-105 (E1) | L-W - BR | Purge valve | Ignition switch ON | 11 to 14 V |
| Idling, under purge control | Pulse generation (see waveform 11) |
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| A18-19 (FC) - B8-105 (E1) | P - BR | Fuel pump control | Ignition switch ON | 11 to 14 V |
| Idling | Below 1.5 V | |||
| A18-15 (TACH) - B8-105 (E1) | R-Y - BR | Engine speed | Idling | Pulse generation (see waveform 12) |
| A18-41 (TC) - B8-105 (E1) | R-G - BR | Terminal TC of DLC3 | Ignition switch ON | 11 to 14 V |
| B8-74 (OC1+) - B8-96 (OC1-) | G - R-W | Camshaft timing oil control valve (for intake camshaft) | Idling | Pulse generation (see waveform 13) |
| B8-75 (OE1+) - B8-97 (OE1-) | L-R - P-L | Camshaft timing oil control valve (for exhaust camshaft) | Idling | Pulse generation (see waveform 14) |
| A18-4 (CAN+) - B8-105 (E1) | B-BR | CAN communication | Ignition switch ON | Pulse generation (see waveform 15) |
| A18-5 (CAN-) - B8-105 (E1) | W-BR | CAN communication | Ignition switch ON | Pulse generation (see waveform 16) |
| A18-8 (CANH) - B8-105 (E1) | L - BR | CAN communication line | Ignition switch ON | Pulse generation (see waveform 15) |
| A18-9 (CANL) - B8-105 (E1) | W - BR | CAN communication line | Ignition switch ON | Pulse generation (see waveform 16) |
| B8-76 (R) - B8-105 (E1) | R - BR | Back-up light switch signal | Back-up light switch on | 11 to 14 V |
| B8-52 (ALT) - B8-105 (E1) | B-L - BR | Generator | Ignition switch ON | 11 to 14 V |
| B8-50 (EGR1) - B8-105 (E1) | R-B - BR | EGR valve | Repeated quick engine rpm acceleration | Pulse generation (see waveform 17) |
| B8-49 (EGR2) - B8-105 (E1) | B-Y - BR | |||
| B8-48 (EGR3) - B8-105 (E1) | W-G - BR | |||
| B8-47 (EGR4) - B8-105 (E1) | B-R - BR | |||
| A18-39 (NEO)*4 - B8-105 (E1) | V-W - BR | Crankshaft position sensor signal | Idling with warm engine | Pulse generation (see waveform 18) |
| A18-21 (FANL) - B8-105 (E1) | LG - BR | NO. 1 FAN relay | Ignition switch ON | 11 to 14 V |
| Idling with A/C on or High engine coolant temperature |
Below 1.5 V | |||
| A18-22 (FANH) - B8-105 (E1) | G-R - BR | NO. 2 FAN relay | Idling with high engine coolant temperature | Below 1.5 V |
| A18-27 (IGSW) - B8-105 (E1) | G-W - BR | Ignition switch | Ignition switch ON | 11 to 14 V |
| A18-44 (MREL) - B8-105 (E1) | L-Y - BR | EFI relay | Ignition switch ON | 11 to 14 V |
| A18-31 (ELS) - B8-105 (E1) | L-R - BR | Electric load | Taillight switch on | 7.5 to 14 V |
| Taillight switch off | Below 1.5 V | |||
| A18-50 (ELS2) - B8-105 (E1) | W-L - BR | Electric load | Defogger switch on | 7.5 to 14 V |
| Defogger switch off | Below 1.5 V | |||
| A18-47 (D) - B8-105 (E1) | L-R- BR | Clutch switch*2 Park/Neutral position switch signal*3 |
Ignition switch ON, clutch pedal depressed*2 | Below 1.5 V |
| Ignition switch ON, clutch pedal released*2 | 11 to 14 V | |||
| Ignition switch ON (shift lever in D)*3 | 11 to 14 V | |||
| Ignition switch ON (shift lever not in D)*3 | Below 1.5 V |
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*1: The ECM terminal voltage is constant regardless of the output voltage from the sensor.
*2: for Manual transaxle
*3: for CVT
*4: w/ Entry and start system
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WAVEFORM 1
Igniter IGT Signal (from ECM to Igniter) 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 rpm increases.
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WAVEFORM 2
Crankshaft Position Sensor Signal ECM Terminal Name Between NE+ and NE- Tester Range 2 V/DIV., 20 ms./DIV. Condition Idling with warm engine Tech Tips
The wavelength becomes shorter as the engine rpm increases.
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WAVEFORM 3
Camshaft Position Sensor Signal ECM Terminal Name CH1: Between G2+ and G2-
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 rpm increases.
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WAVEFORM 4
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 rpm increases.
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WAVEFORM 5
Air Fuel Ratio Sensor (Bank 1 Sensor 1) Heater Signal ECM Terminal Name Between HA1A and E04 Tester Range 5 V/DIV., 10 ms./DIV. Condition Idling with warm engine Tech Tips
The wavelength varies in accordance with the engine operating condition.
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WAVEFORM 6
Heated Oxygen Sensor (Bank 1 Sensor 2) Signal 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 item O2S B1S2 shows the values input to the ECM from the heated oxygen sensor.
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WAVEFORM 7
Knock Sensor Signal 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 rpm increases.
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The waveforms and amplitudes displayed differ slightly depending on the vehicle condition.
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WAVEFORM 8
Vehicle Speed Signal ECM Terminal Name Between SPD and E1 Tester Range 5 V/DIV., 20 ms./DIV. Condition Rotate driving wheel slowly Tech Tips
The wavelength becomes shorter as the vehicle speed increases.
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WAVEFORM 9
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 10
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 11
Purge Valve 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 12
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 rpm increases.
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WAVEFORM 13
Camshaft Timing Oil Control Valve (for Intake Camshaft Signal) ECM Terminal Name Between OC1+ and OC1- Tester Range 5 V/DIV., 1 ms./DIV. Condition Idling -
WAVEFORM 14
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 15
CAN Communication Signal (Reference) ECM Terminal Name Between CAN+ and E1
Between CANH 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 16
CAN Communication Signal (Reference) ECM Terminal Name Between CAN- and E1
Between CANL 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 17
EGR Valve Signal ECM Terminal Name EGR1, EGR2, EGR3, EGR4 and E1 Tester Range 20 V/DIV., 50 ms./DIV. Condition Repeated quick engine rpm acceleration -
WAVEFORM 18
Crankshaft Position Sensor Signal ECM Terminal Name Between NEO and E1 Tester Range 1 V/DIV., 2 ms./DIV. Condition Idling with warm engine Tech Tips
The wavelength becomes shorter as the engine rpm increases.