SFI SYSTEM(w/o EGR System) TERMINALS OF ECM
Tech Tips
The standard 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 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 |
|---|---|---|---|---|
| A78-1 (BATT) - F5-16 (E1) | L - BR | Auxiliary battery (for measuring auxiliary battery voltage and for ECM memory) | Power switch off | 11 to 16 V |
| A78-2 (+B) - F5-16 (E1) | B-R - BR | Power source of ECM | Power switch on (IG) | 11 to 14 V |
| A78-3 (+B2) - F5-16 (E1) | B-R - BR | Power source of ECM | Power switch on (IG) | 11 to 14 V |
| F5-29 (+BM) - F5-16 (E1) | R - BR | Power source of throttle actuator | Power switch off | 11 to 14 V |
| A78-37 (IGSW) - F5-16 (E1) | LG - BR | Power switch on (IG) signal | Power switch on (IG) | 11 to 14 V |
| F5-74 (OC1+) - F5-75 (OC1-) | V - Y | Camshaft timing oil control valve assembly (intake camshaft) operation signal | Idling | Pulse generation (See waveform 1) |
| F5-65 (OE1+) - F5-64 (OE1-) | LG - L | Camshaft timing oil control valve assembly (exhaust camshaft) operation signal | Idling | Pulse generation (See waveform 2) |
| A78-46 (MREL) - F5-16 (E1) | Y - BR | EFI MAIN relay operation signal | Power switch on (IG) | 11 to 14 V |
| F5-91 (VG) - F5-92 (E2G) | G - R | Mass air flow meter sub-assembly signal | Idling, shift lever in P, A/C switch off | 0.5 to 3.0 V |
| F5-93 (THA) - F5-94 (ETHA) | Y - LG | Intake air temperature sensor signal | Idling, intake air temperature 20°C (68°F) | 0.5 to 3.4 V |
| F5-95 (THW) - F5-96 (ETHW) | B - BR | Engine coolant temperature sensor signal | Idling, engine coolant temperature 80°C (176°F) | 0.2 to 1.0 V |
| F5-125 (VCTA) - F5-16 (E1) | V - BR | Power source of throttle position sensor (specific voltage) | Power switch on (IG) | 4.5 to 5.5 V |
| F5-127 (VTA1) - F5-126 (ETA) | G - GR | Throttle position sensor signal (for engine control) | Accelerator pedal fully released | 0.5 to 1.1 V |
| F5-128 (VTA2) - F5-126 (ETA) | L - GR | Throttle position sensor signal (for sensor malfunction detection) | Accelerator pedal fully released | 2.1 to 3.1 V |
| F5-23 (HA1A) - F5-53 (E04) | B - W-B | Air fuel ratio sensor heater operation signal | Idling with cold engine | Pulse generation (See waveform 3) |
| Power switch on (IG) | 11 to 14 V | |||
| F5-133 (A1A+) - F5-16 (E1) | R - BR | Air fuel ratio sensor signal | Power switch on (IG) | 3.0 to 3.6 V |
| F5-134 (A1A-) - F5-16 (E1) | G - BR | Air fuel ratio sensor signal | Power switch on (IG) | 2.7 to 3.3 V |
| F5-24 (HT1B) - F5-53 (E04) | Y - W-B | Heated oxygen sensor heater operation signal | Idling | Below 3.0 V |
| Power switch on (IG) | 11 to 14 V | |||
| F5-100 (OX1B) - F5-132 (EX1B) | SB - P | Heated oxygen sensor signal | Engine speed maintained at 2500 rpm after warming up engine | Pulse generation (See waveform 4) |
| F5-20 (#10) - F5-50 (E01) | B - W-B | No. 1 fuel injector assembly (for port injection) signal | Idling with warm engine (port injection control) | Pulse generation (See waveform 5) |
| F5-17 (#20) - F5-50 (E01) | L - W-B | No. 2 fuel injector assembly (for port injection) signal | Idling with warm engine (port injection control) | Pulse generation (See waveform 5) |
| F5-18 (#30) - F5-50 (E01) | GR - W-B | No. 3 fuel injector assembly (for port injection) signal | Idling with warm engine (port injection control) | Pulse generation (See waveform 5) |
| F5-19 (#40) - F5-50 (E01) | V - W-B | No. 4 fuel injector assembly (for port injection) signal | Idling with warm engine (port injection control) | Pulse generation (See waveform 5) |
| F5-123 (KNK1) - F5-124 (EKNK) | B - W | Knock control sensor signal | Engine speed maintained at 2500 rpm after warming up engine | Pulse generation (See waveform 6) |
| F5-113 (VCV1) - F5-16 (E1) | LG - BR | Power source of camshaft position sensor for intake camshaft (specific voltage) | Power switch on (IG) | 4.5 to 5.5 V |
| F5-82 (VV1+) - F5-114 (VV1-) | B - V | Camshaft position sensor for intake camshaft signal | Idling with warm engine | Pulse generation (See waveform 7) |
| F5-111 (VCE1) - F5-16 (E1) | L - BR | Power source of camshaft position sensor for exhaust camshaft (specific voltage) | Power switch on (IG) | 4.5 to 5.5 V |
| F5-81 (EV1+) - F5-112 (EV1-) | P - W | Camshaft position sensor for exhaust camshaft signal | Idling with warm engine | Pulse generation (See waveform 7) |
| A78-60 (G2O) - F5-16 (E1) | B - BR | Camshaft revolution signal | Idling with warm engine | Pulse generation (See waveform 8) |
| F5-76 (NE+) - F5-109 (NE-) | R - G | Crankshaft position sensor signal | Idling with warm engine | Pulse generation (See waveform 9) |
| F5-57 (IGT1) - F5-16 (E1) | P - BR | No. 1 ignition coil assembly (ignition signal) | Idling with warm engine | Pulse generation (See waveform 10) |
| F5-56 (IGT2) - F5-16 (E1) | LG - BR | No. 2 ignition coil assembly (ignition signal) | Idling with warm engine | Pulse generation (See waveform 10) |
| F5-55 (IGT3) - F5-16 (E1) | SB - BR | No. 3 ignition coil assembly (ignition signal) | Idling with warm engine | Pulse generation (See waveform 10) |
| F5-54 (IGT4) - F5-16 (E1) | V - BR | No. 4 ignition coil assembly (ignition signal) | Idling with warm engine | Pulse generation (See waveform 10) |
| F5-51 (IGF1) - F5-16 (E1) | P - BR | Ignition coil assembly (ignition confirmation signal) | Idling with warm engine | Pulse generation (See waveform 10) |
| F5-68 (PRG) - F5-50 (E01) | W - W-B | Purge VSV signal | Power switch on (IG) | 11 to 14 V |
| Idling, under purge control | Pulse generation (See waveform 11) |
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| F5-60 (M+) - F5-58 (ME01) | R - W-B | Throttle actuator operation signal (positive terminal) |
Idling with warm engine | Pulse generation (See waveform 12) |
| F5-30 (M-) - F5-58 (ME01) | G - W-B | Throttle actuator operation signal (negative terminal) |
Idling with warm engine | Pulse generation (See waveform 13) |
| A78-21 (FPC) - F5-50 (E01) | R - W-B | Fuel pump control | Power switch on (IG) | Bellow 1.5 V |
| A78-31 (TACH) - F5-16 (E1) | W - BR | Engine speed signal | Idling with warm engine | Pulse generation (See waveform 14) |
| A78-13 (CANH) - F5-16 (E1) | R - BR | CAN communication line | Power switch on (IG) | Pulse generation (See waveform 15) |
| A78-26 (CANL) - F5-16 (E1) | B - BR | CAN communication line | Power switch on (IG) | Pulse generation (See waveform 16) |
| F5-78 (VCPM) - F5-80 (EPIM) | BR - GR | Power source of manifold absolute pressure sensor | Power switch on (IG) | 4.75 to 5.25 V |
| F5-102 (VCPR) - F5-103 (EPR) | P - BR | Power source of fuel pressure sensor | Power switch on (IG) | 4.75 to 5.25 V |
| F5-101 (PR) - F5-103 (EPR) | L - BR | Fuel pressure sensor | Power switch on (IG) | 0.34 to 4.7 V |
| F5-79 (PIM) - F5-80 (EPIM) | Y - GR | Manifold absolute pressure sensor signal | Power switch on (IG) | 3.0 to 5.0 V |
| A78-8 (IREL) - F5-50 (E01) | G - WB | INJ relay operation signal | Power switch on (IG) | 0 to 1.5 V |
| F5-116 (INJ1) - F5-16 (E1) | W - BR | Fuel injector assembly (for direct injection) confirmation signal | Idling with warm engine (direct injection control) | Pulse generation (See waveform 17) |
| F5-117 (INJ2) - F5-16 (E1) | B - BR | Fuel injector assembly (for direct injection) confirmation signal | Idling with warm engine (direct injection control) | Pulse generation (See waveform 17) |
| F5-85 (#1) - F5-16 (E1) | RG - BR | Fuel injector assembly (for direct injection) signal | Idling with warm engine (direct injection control) | Pulse generation (See waveform 17) |
| F5-86 (#2) - F5-16 (E1) | L - BR | Fuel injector assembly for (direct injection) signal | Idling with warm engine (direct injection control) | Pulse generation (See waveform 17) |
| F5-87 (#3) - F5-16 (E1) | R - BR | Fuel injector assembly (for direct injection) signal | Idling with warm engine (direct injection control) | Pulse generation (See waveform 17) |
| F5-88 (#4) - F5-16 (E1) | P - BR | Fuel injector assembly (for direct injection) signal | Idling with warm engine (direct injection control) | Pulse generation (See waveform 17) |
| F5-115 (FPF) - F5-16 (E1) | G - BR | Fuel pump (for high pressure) (spill valve) | Idling with warm engine | Pulse generation (See waveform 18) |
| F5-118 (FPD) - F5-16 (E1) | GR - BR | Fuel pump (for high pressure) (spill valve) | Idling with warm engine | Pulse generation (See waveform 18) |
| A78-44 (RFC) - F5-16 (E1) | G - BR | Cooling fan control | Power switch on (IG), A/C switch on (max cool) |
Pulse generation (See waveform 19) |
| F5-99 (SPCN) - F5-16 (E1) | G - BR | Drive mode switch (NORMAL mode) | Power switch on (IG) | 11 to 14 V |
| Power switch on (IG), NORMAL mode switch being pushed and held (NORMAL mode) | 0 to 1.5 V | |||
| A78-42 (SPSW)*1 - F5-16 (E1) | B - BR | Drive mode switch (SPORT mode) | Power switch on (IG) | 11 to 14 V |
| Power switch on (IG), SPORT mode switch being turned and held at SPORT position (SPORT mode) | 0 to 1.5 V | |||
| A78-9 (PWMS)*2 - F5-16 (E1) | B - BR | Drive mode switch (SPORT mode) | Power switch on (IG) | 11 to 14 V |
| Power switch on (IG), SPORT mode switch being turned and held at SPORT position (SPORT mode) | 0 to 1.5 V | |||
| A78-43 (SNWI) - F5-16 (E1) | P - BR | SNOW mode switch | Power switch on (IG) | 11 to 14 V |
| Power switch on (IG), SNOW mode switch being pushed and held (SNOW mode) | 0 to 1.5 V | |||
| A78-14 (EC) - body ground | W-B - - | Earth (ground) circuit of ECM | Always | Below 1 Ω |
| F5-16 (E1) - body ground | BR- - | Earth (ground) circuit of ECM | Always | Below 1 Ω |
| F5-50 (E01) - body ground | W-B - - | Earth (ground) circuit of ECM | Always | Below 1 Ω |
| F5-49 (E02) - body ground | W-B - - | Earth (ground) circuit of ECM | Always | Below 1 Ω |
| F5-53 (E04) - body ground | W-B - - | Earth (ground) circuit of ECM | Always | Below 1 Ω |
| F5-58 (ME01) - body ground | W-B - - | Earth (ground) circuit of ECM | Always | Below 1 Ω |
| F5-59 (GE01) - body ground | BR - - | Shielded earth (ground) circuit of throttle actuator | Always | Below 1 Ω |
*1: w/ Adaptive variable suspension.
*2: w/o Adaptive variable suspension.
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WAVEFORM 1
*a 5 V/DIV. *b 1 ms./DIV. Camshaft Timing Oil Control Valve Assembly (for Intake Camshaft) Operation Signal ECM Terminal Name Between OC1+ and OC1- Tester Range 5 V/DIV., 1 ms./DIV. Condition Idling -
WAVEFORM 2
*a 5 V/DIV. *b 1 ms./DIV. Camshaft Timing Oil Control Valve Assembly (for Exhaust Camshaft) Operation Signal ECM Terminal Name Between OE1+ and OE1- Tester Range 5 V/DIV., 1 ms./DIV. Condition Idling -
WAVEFORM 3
*a 5 V/DIV. *b 10 ms./DIV. Air Fuel Ratio Sensor (Sensor 1) Heater Operation Signal ECM Terminal Name Between HA1A and E04 Tester Range 5 V/DIV., 10 ms./DIV. Condition Idling with cold engine -
WAVEFORM 4
*1 0.2 V/DIV. *2 200 ms./DIV. Heated Oxygen Sensor (Sensor 2) Signal ECM Terminal Name Between OX1B and EX1B Tester Range 0.2 V/DIV., 200 ms./DIV. Condition Engine speed maintained at 2500 rpm after warming up engine 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 5
*1 20 V/DIV. *2 20 ms./DIV. No. 1 (to No. 4) Fuel Injector Assembly (for Port Injection) Signal ECM Terminal Name Between #10 (to #40) and E01 Tester Range 20 V/DIV., 20 ms./DIV. Condition Idling with warm engine (port injection control) Tech Tips
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The wavelength becomes shorter as the engine speed increases.
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When the port injection injectors are operating, Port is displayed for Injection Way of the Data List.
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WAVEFORM 6
*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 2500 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 condition.
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WAVEFORM 7
*a 5 V/DIV. *b 20 ms/DIV. Camshaft Position Sensor (Intake and Exhaust Camshaft) 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 8
*a 5 V/DIV. *b 20 ms./DIV. Camshaft Revolution Signal from ECM to Power Management Control ECU and Inverter with Converter Assembly ECM Terminal Name Between G2O and E1 Tester Range 5 V/DIV., 20 ms./DIV. Condition Idling Tech Tips
The wavelength becomes shorter as the engine speed increases.
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WAVEFORM 9
*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 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 with warm engine Tech Tips
The wavelength becomes shorter as the engine speed increases.
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WAVEFORM 11
*1 10 V/DIV. *2 20 ms./DIV. Purge VSV Operation Signal ECM Terminal Name Between PRG and E01 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
*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 13
*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 14
*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 with warm engine Tech Tips
The wavelength becomes shorter as the engine speed increases.
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WAVEFORM 15
*a 1 V/DIV. *b 10 μs./DIV. CAN Communication Signal (Reference) ECM Terminal Name Between CANH 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.
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WAVEFORM 16
*a 1 V/DIV. *b 10 μs./DIV. CAN Communication Signal (Reference) ECM Terminal Name Between CANL 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.
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WAVEFORM 17
*a 2 V/DIV. *b 20 ms./DIV No. 1 (to No. 4) Fuel Injector Assembly (for Direct Injection) Signal ECM Terminal Name CH1: Between #1 and E1
CH2: Between INJ1 and E1
CH1: Between #2 and E1
CH2: Between INJ2 and E1
CH1: Between#3 and E1
CH2: Between INJ2 and E1
CH1: Between #4 and E1
CH2: Between INJ1 and E1
Tester Range 20 V/DIV., 20 ms./DIV. Condition Idling with warm engine (direct injection control) Tech Tips
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The wavelength becomes shorter as the engine speed increases.
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When the direct injection injectors are operating, Direct is displayed for Injection Way of the Data List.
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WAVEFORM 18
*a 2 V/DIV. *b 5 ms./DIV. Fuel Pump (for High Pressure) (Spill Control Valve) Operation Signal 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 -
WAVEFORM 19
*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 duty ratio varies depending on the engine coolant temperature.