SFI SYSTEM(w/o Canister Pump Module) 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 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 |
|---|---|---|---|---|
| A70-7 (BATT) - F4-1 (E1) | L - BR | Battery (for measuring the battery voltage and for the ECM memory) | Always | 11 to 14 V |
| F1-1 (+BM) - F4-1 (E1) | P - BR | Power source of throttle actuator | Always | 11 to 14 V |
| A70-8 (IGSW) - F4-1 (E1) | LG - BR | Engine switch | Engine switch on (IG) | 11 to 14 V |
| A71-2 (+B) - F4-1 (E1) | B-R - BR | Power source of ECM | Engine switch on (IG) | 11 to 14 V |
| A71-1 (+B2) - F4-1 (E1) | B-R - BR | Power source of ECM | Engine switch on (IG) | 11 to 14 V |
| F1-12 (OC1+) - F1-11 (OC1-) | W - Y | Camshaft timing oil control valve assembly (for intake camshaft of bank 1) operation signal | Idling | Pulse generation (see waveform 1) |
| F1-10 (OC2+) - F1-9 (OC2-) | LG - L | Camshaft timing oil control valve assembly (for intake camshaft of bank 2) operation signal | Idling | Pulse generation (see waveform 1) |
| F2-4 (OE1+) - F2-3 (OE1-) | LG - B | Camshaft timing oil control valve assembly (for exhaust camshaft of bank 1) operation signal | Idling | Pulse generation (see waveform 2) |
| F3-18 (OE2+) - F3-28 (OE2-) | W - G | Camshaft timing oil control valve assembly (for exhaust camshaft of bank 2) operation signal | Idling | Pulse generation (see waveform 2) |
| A70-3 (MREL) - F4-1 (E1) | Y - BR | EFI-MAIN relay operation signal | Engine switch on (IG) | 11 to 14 V |
| F2-34 (VCTA) - F2-35 (ETA) | G - R | Power source for throttle position sensor (specific voltage) | Engine switch on (IG) | 4.5 to 5.5 V |
| F1-18 (VC) - F4-1 (E1) | L - BR | Power source for sensor (specific voltage) | Engine switch on (IG) | 4.5 to 5.5 V |
| F1-25 (VG) - F1-24 (E2G) | R - W | Mass air flow meter sub-assembly signal | Idling, shift lever position P or N, A/C switch OFF | 0.5 to 3.0 V |
| F1-22 (THA) - F1-28 (E2) | G - BR | Intake air temperature sensor | Idling, intake air temperature 0 to 80°C (32 to 176°F) | 0.5 to 3.4 V |
| F1-19 (THW) - F1-28 (E2) | R - BR | Engine coolant temperature sensor | Idling, engine coolant temperature 60 to 120°C (140 to 248°F) | 0.2 to 1.0 V |
| F2-26 (VTA) - F2-35 (ETA) | W - R | Throttle position sensor signal (for engine control) | Accelerator pedal fully released | 0.5 to 1.1 V |
| Accelerator pedal fully depressed (engine running) | 3.2 to 4.8 V | |||
| F2-27 (VTA2) - F2-35 (ETA) | L - R | Throttle position sensor signal (for sensor malfunction detection) | Accelerator pedal fully released | 2.1 to 3.1 V |
| Accelerator pedal fully depressed (engine running) | 4.6 to 5.0 V | |||
| A71-29 (NSW) - F4-1 (E1) | L - BR | Park/Neutral position switch assembly signal | Engine switch on (IG), shift lever in P or N | Below 1 V |
| A70-4 (IREL) - F4-1 (E1) | B - BR | INJ relay operation signal | Engine switch on (IG) | 11 to 14 V |
| A70-29 (VPA) - A70-20 (EPA) | G - L | Accelerator pedal position sensor signal (for engine control) | Engine switch on (IG), accelerator pedal fully released | 0.5 to 1.1 V |
| Engine switch on (IG), accelerator pedal fully depressed | 2.6 to 4.5 V | |||
| A70-28 (VPA2) - A70-21 (EPA2) | P - B | Accelerator pedal position sensor signal | Engine switch on (IG), accelerator pedal fully released | 1.2 to 2.0 V |
| Engine switch on (IG), accelerator pedal fully depressed | 3.4 to 4.75 V | |||
| A70-23 (VCPA) - A70-20 (EPA) | R - L | Power source of accelerator pedal position sensor (for VPA) | Engine switch on (IG) | 4.5 to 5.5 V |
| A70-22 (VCP2) - A70-21 (EPA2) | R - B | Power source of accelerator pedal position sensor (for VPA2) | Engine switch on (IG) | 4.5 to 5.5 V |
| A70-14 (KD) - F4-1 (E1) | B - BR | Kick down switch signal | Engine switch on (IG), accelerator pedal released | 11 to 14 V |
| F4-5 (HA1A) - F4-4 (E04) F4-6 (HA2A) - F3-1 (E05) |
Y - W-B B - W-B |
Air fuel ratio sensor (sensor 1) heater operation signal | Engine switch on (IG) | 11 to 14 V |
| Idling | Pulse generation (see waveform 3) |
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| F3-23 (A1A+) - F4-1 (E1) | R - BR | Air fuel ratio sensor (bank 1 sensor 1) signal | Engine switch on (IG) | 3.3 V*1 |
| F3-21 (A2A+) - F4-1 (E1) | B - BR | Air fuel ratio sensor (bank 2 sensor 1) signal | Engine switch on (IG) | 3.3 V*1 |
| F3-22 (A1A-) - F4-1 (E1) | G - BR | Air fuel ratio sensor (bank 1 sensor 1) signal | Engine switch on (IG) | 2.9 V*1 |
| F3-20 (A2A-) - F4-1 (E1) | W - BR | Air fuel ratio sensor (bank 2 sensor 1) signal | Engine switch on (IG) | 2.9 V*1 |
| A71-4 (HT1B) - A71-5 (E03) A71-3 (HT2B) - A71-5 (E03) |
L - W-B P - W-B |
Heated oxygen sensor (sensor 2) heater operation signal | Engine switch on (IG) | 11 to 14 V |
| Idling | Below 3.0 V | |||
| A71-26 (OX1B) - F1-28 (E2) A71-27 (OX2B) - F1-28 (E2) |
G - BR W - BR |
Heated oxygen sensor (sensor 2) signal | Engine speed maintained at 2500 rpm for 2 minutes after warming up engine | Pulse generation (see waveform 4) |
| F4-20 (#1) - F4-1 (E1) F4-10 (#2) - F4-1 (E1) F4-9 (#3) - F4-1 (E1) F4-19 (#4) - F4-1 (E1) F4-8 (#5) - F4-1 (E1) F4-18 (#6) - F4-1 (E1) |
LG - BR L - BR R - BR P - BR V - BR W - BR |
Fuel injector assembly (for direct injection) signal | Engine switch on (IG) | 0 to 5.0 V |
| Idling with warm engine | Pulse generation (see waveform 5, 16) |
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| F3-17 (#10) - F2-2 (E01) F2-11 (#20) - F2-2 (E01) F3-16 (#30) - F2-2 (E01) F2-10 (#40) - F2-2 (E01) F3-15 (#50) - F2-2 (E01) F2-9 (#60) - F2-2 (E01) |
Y - W-B G - W-B L - W-B BR - W-B P - W-B R - W-B |
Fuel injector assembly (for port injection) signal | Engine switch on (IG) | 0 to 5.0 V |
| Idling, engine coolant temperature 60°C or less | Pulse generation (see waveform 6) |
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| F4-26 (KNK1) - F4-33 (EKNK) | B - W | Knock control sensor (bank 1) signal | Engine speed maintained at 4000 rpm after warming up engine | Pulse generation (see waveform 7) |
| F4-25 (KNK2) - F4-32 (EKN2) | R - G | Knock control sensor (bank 2) signal | Engine speed maintained at 4000 rpm after warming up engine | Pulse generation (see waveform 7) |
| F2-24 (VV1+) - F2-32 (VV1-) | Y - V | VVT sensor (for intake camshaft of bank 1) signal | Idling with warm engine | Pulse generation (see waveform 8) |
| F3-19 (VV2+) - F3-29 (VV2-) | GR - W | VVT sensor (for intake camshaft of bank 2) signal | Idling with warm engine | Pulse generation (see waveform 8) |
| F1-27 (NE+) - F1-34 (NE-) | W - B | Crankshaft position sensor signal | Idling with warm engine | Pulse generation (see waveform 8, 9) |
| F1-26 (EV1+) - F1-33 (EV1-) | P - LG | VVT sensor (for exhaust camshaft of bank 1) signal | Idling with warm engine | Pulse generation (see waveform 9) |
| F4-22 (EV2+) - F4-29 (EV2-) | G - R | VVT sensor (for exhaust camshaft of bank 2) signal | Idling with warm engine | Pulse generation (see waveform 9) |
| F3-27 (IGT1) - F4-1 (E1) | V - BR | No. 1 ignition coil assembly (ignition signal) | Idling with warm engine | Pulse generation (see waveform 10) |
| F2-23 (IGT2) - F4-1 (E1) | L - BR | No. 2 ignition coil assembly (ignition signal) | Idling with warm engine | Pulse generation (see waveform 10) |
| F3-26 (IGT3) - F4-1 (E1) | Y - BR | No. 3 ignition coil assembly (ignition signal) | Idling with warm engine | Pulse generation (see waveform 10) |
| F2-22 (IGT4) - F4-1 (E1) | P - BR | No. 4 ignition coil assembly (ignition signal) | Idling with warm engine | Pulse generation (see waveform 10) |
| F3-25 (IGT5) - F4-1 (E1) | V - BR | No. 5 ignition coil assembly (ignition signal) | Idling with warm engine | Pulse generation (see waveform 10) |
| F2-21 (IGT6) - F4-1 (E1) | W - BR | No. 6 ignition coil assembly (ignition signal) | Idling with warm engine | Pulse generation (see waveform 10) |
| F3-32 (IGF1) - F4-1 (E1) F2-28 (IGF2) - F4-1 (E1) |
G - BR V - BR |
Ignition coil assembly (ignition confirmation signal) | Engine switch on (IG) | 4.5 to 5.5 V |
| Idling with warm engine | Pulse generation (see waveform 10) |
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| F1-17 (PRG) - F4-1 (E1) | W - BR | Purge VSV for EVAP system operation signal | Engine switch on (IG) | 11 to 14 V |
| Idling, under purge control | Pulse generation (see waveform 11) |
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| A70-24 (SPD) - F4-1 (E1) | P - BR | Vehicle speed signal from combination meter assembly | Driving at 20 km/h (12 mph) | Pulse generation (see waveform 12) |
| A71-20 (STA) - F4-1 (E1) | R - BR | Starter signal | Cranking | 6.0 V or higher |
| A70-13 (STP) - F4-1 (E1) | R - BR | Stop light switch assembly signal | Brake pedal depressed | 7.5 to 14 V |
| Brake pedal released | Below 1.5 V | |||
| A70-12 (ST1-) - F4-1 (E1) | P - BR | Stop light switch assembly signal (opposite to STP terminal) | Engine switch on (IG), brake pedal depressed | Below 1.5 V |
| Engine switch on (IG), brake pedal released | 7.5 to 14 V | |||
| F2-7 (M+) - F2-5 (ME01) | B - W-B | Throttle actuator operation signal (positive terminal) | Idling with warm engine | Pulse generation (see waveform 13) |
| F2-6 (M-) - F2-5 (ME01) | W - W-B | Throttle actuator operation signal (negative terminal) | Idling with warm engine | Pulse generation (see waveform 14) |
| A70-5 (FPC) - F4-1 (E1) | P - BR | Fuel pump control | Engine stopped, engine switch on (IG) | Below 1.5 V |
| A71-21 (TC) - F4-1 (E1) | V - BR | Terminal TC of DLC3 | Engine switch on (IG) | 11 to 14 V |
| A70-15 (TACH) - F4-1 (E1) | W - BR | Engine speed signal | Idling with warm engine | Pulse generation (see waveform 15) |
| F2-13 (INJ1) - F4-1 (E1) | GR - BR | Fuel injector assembly (for direct injection) confirmation signal | Idling with warm engine | Pulse generation (see waveform 16) |
| F2-12 (INJ2) - F4-1 (E1) | B - BR | Fuel injector assembly (for direct injection) confirmation signal | Idling with warm engine | Pulse generation (see waveform 16) |
| F2-15 (INJ3) - F4-1 (E1) | Y - BR | Fuel injector assembly (for direct injection) confirmation signal | Idling with warm engine | Pulse generation (see waveform 16) |
| F3-10 (FPF1) - F4-1 (E1) | G - BR | Fuel pump (for high pressure side) signal | Idling with warm engine | Pulse generation (see waveform 17) |
| F3-11 (FPD) - F4-1 (E1) | LG - BR | Fuel pump (for high pressure side) signal | Idling with warm engine | Pulse generation (see waveform 17) |
| F4-27 (PR) - F1-28 (E2) | V - BR | Fuel pressure sensor | Idling with warm engine | 1.0 to 1.7 V |
| A70-27 (NEO) - F4-1 (E1) | B - BR | Engine speed signal sent to certification ECU (smart key ECU assembly) | Idling with warm engine | Pulse generation (see waveform 20) |
| A70-25 (KSW) - F4-1 (E1) | P - BR | Key in vehicle signal | Engine switch off → on (IG) | 0 to 3.0 V |
| A70-19 (RFC) - F4-1 (E1) | G - BR | Cooling fan control | Engine switch on (IG), A/C switch on (max cool) | Pulse generation (see waveform 21) |
| F2-18 (ALT) - F4-1(E1) | G - BR | Generator assembly | Engine switch on (IG) | 11 to 14 V |
| A71-14 (CANH) - F4-1 (E1) | R - BR | CAN communication line | Engine switch on (IG) | Pulse generation (see waveform 18) |
| A71-10 (CAN+) - F4-1 (E1) | B - BR | CAN communication line | Engine switch on (IG) | Pulse generation (see waveform 18) |
| A71-13 (CANL) - F4-1 (E1) | B - BR | CAN communication line | Engine switch on (IG) | Pulse generation (see waveform 19) |
| A71-9 (CAN-) - F4-1 (E1) | W - BR | CAN communication line | Engine switch on (IG) | Pulse generation (see waveform 19) |
| A71-25 (SPCN) - F4-1 (E1) | G - BR | Drive mode switch signal (NORMAL mode) | Engine switch on (IG) | 11 to 14 V |
| Engine switch on (IG), NORMAL mode switch being pushed and held (NORMAL mode) | Below 1.5 V | |||
| A70-16 (SPSW)*2 - F4-1 (E1) | B - BR | Drive mode switch signal (SPORT mode) | Engine switch on (IG) | 11 to 14 V |
| Engine switch on (IG), SPORT mode switch being turned and held at SPORT position (SPORT mode) | Below 1.5 V | |||
| A71-23 (PWR)*3 - F4-1 (E1) | B - BR | Drive mode switch signal (SPORT mode) | Engine switch on (IG) | 11 to 14 V |
| Engine switch on (IG), SPORT mode switch being turned and held at SPORT position (SPORT mode) | Below 1.5 V | |||
| A71-22 (SNWI) - F4-1 (E1) | P - BR | SNOW mode switch signal | Engine switch on (IG) | 11 to 14 V |
| Engine switch on (IG), SNOW mode switch being pushed and held (SNOW mode) | Below 1.5 V | |||
| F4-11 (R) - F4-1 (E1) | R - BR | R shift position switch signal | Engine switch on (IG), shift lever in R | 11 to 14 V |
| Engine switch on (IG), shift lever not in R | Below 1 V | |||
| F4-14 (D) - F4-1 (E1) | W - BR | D shift position switch signal | Engine switch on (IG), shift lever in D or M | 11 to 14 V |
| Engine switch on (IG), shift lever not in D or M | Below 1 V | |||
| F4-13 (N) - F4-1 (E1) | G - BR | N shift position switch signal | Engine switch on (IG), shift lever in N | 11 to 14 V |
| Engine switch on (IG), shift lever not in N | Below 1 V | |||
| F4-12 (P) - F4-1 (E1) | B - BR | Park/Neutral position switch signal | Engine switch on (IG), shift lever in P | 11 to 14 V |
| Engine switch on (IG), shift lever not in P | Below 1 V | |||
| A71-16 (S) - F4-1 (E1) | GR - BR | M shift position switch signal | Engine switch on (IG), shift lever in M | 11 to 14 V |
| Engine switch on (IG), shift lever not in M | Below 1 V | |||
| F2-19 (GE01) - F4-1 (E1) | - - BR | Shielded earth (ground) circuit of throttle actuator | Always | Below 1 Ω |
| F2-5 (ME01) - Body ground | W-B - - | Ground | Always | Below 1 Ω |
| A70-1 (EC) - Body ground | W-B - - | Ground | Always | Below 1 Ω |
| F4-1 (E1) - Body ground | BR - - | Ground | Always | Below 1 Ω |
| F2-2 (E01) - Body ground | W-B - - | Ground | Always | Below 1 Ω |
| F2-1 (E02) - Body ground | W-B - - | Ground | Always | Below 1 Ω |
| A71-5 (E03) - Body ground | W-B - - | Ground | Always | Below 1 Ω |
| F4-4 (E04) - Body ground | W-B - - | Ground | Always | Below 1 Ω |
| F3-1 (E05) - Body ground | W-B - - | Ground | Always | Below 1 Ω |
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*1: The ECM terminal voltage is constant regardless of the output voltage from the sensor.
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*2 w/ adaptive variable suspension.
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*3: 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-, or OC2+ and OC2- 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-, or OE2+ and OE2- 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, or HA2A and E05 Tester Range 5 V/DIV., 10 ms./DIV. Condition Idling -
WAVEFORM 4
*1 0.2 V/DIV. *2 200 ms./DIV. Heated Oxygen Sensor (Sensor 2) Signal 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 the Data List, item O2S B1S2 and O2S B2S2 shows the ECM values from the heated oxygen sensor.
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WAVEFORM 5
*a 2 V/DIV. *b 20 ms./DIV. Fuel Injector Assembly (for Direct Injection) Signal ECM Terminal Name Between #1 (to #6) and E1 Tester Range 2 V/DIV., 20 ms./DIV. Condition Idling with warm engine 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 6
*1 20 V/DIV. *2 20 ms./DIV. Fuel Injector Assembly (for Port Injection) Signal ECM Terminal Name Between #10 (to #60) and E01 Tester Range 20 V/DIV., 20 ms./DIV. Condition Idling, engine coolant temperature 60°C or less 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 7
*a 1 V/DIV. *b 1 ms./DIV. Knock Control Sensor Signal ECM Terminal Name Between KNK1 and EKNK, or KNK2 and EKN2 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 condition.
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WAVEFORM 8
*a 5 V/DIV. *b 20 ms./DIV. Crankshaft Position Sensor Signal and VVT Sensor (for Intake Camshaft) Signal ECM Terminal Name Between NE+ and NE-
Between VV1+ and VV1-
Between VV2+ and VV2-
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 9
*a 5 V/DIV. *b 20 ms./DIV. Crankshaft Position Sensor Signal and VVT Sensor (for Exhaust Camshaft) Signal ECM Terminal Name Between NE+ and NE-
Between EV1+ and EV1-
Between EV2+ and EV2-
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: IGT1, 3 or 5 and E1
CH2: IGF1 and E1
CH1: IGT2, 4 or 6 and E1
CH2: IGF2 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 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
*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 13
*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 14
*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 15
*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 16
*a 2 V/DIV. *b 20 ms./DIV Fuel Injector Assembly (for Direct 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
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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 17
*a 2 V/DIV. *b 5 ms./DIV. Fuel Pump for High Pressure Side Signal (Spill Control Valve) ECM Terminal Name CH1: Between FPD and E1
CH2: Between FPF1 and E1
Tester Range 2 V/DIV., 5 ms./DIV. Condition Idling with warm engine -
WAVEFORM 18
*a 1 V/DIV. *b 10 μs./DIV. CAN Communication Signal (Reference) ECM Terminal Name Between CANH and E1
Between CAN+ and E1
Tester Range 1 V/DIV., 10 μs./DIV. Condition Engine switch on (IG) Tech Tips
The waveform varies depending on the CAN communication signal.
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WAVEFORM 19
*a 1 V/DIV. *b 10 μs./DIV. CAN Communication Signal (Reference) ECM Terminal Name Between CANL and E1
Between CAN- and E1
Tester Range 1 V/DIV., 10 μs./DIV. Condition Engine switch on (IG) Tech Tips
The waveform varies depending on the CAN communication signal.
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WAVEFORM 20
*a 2 V/DIV. *b 2 ms./DIV. Engine Speed Signal ECM Terminal Name Between NEO and E1 Tester Range 2 V/DIV., 2 ms./DIV. Condition Idling with warm engine Tech Tips
The wavelength becomes shorter as the engine speed increases.
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WAVEFORM 21
*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 Engine switch on (IG), A/C switch on (max cool) Tech Tips
The duty ratio varies depending on the engine coolant temperature.