SFI SYSTEM TERMINALS OF ECM

B006G09E72

Tech Tips

The standard 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 is also indicated. The result of checks should be compared with the standard voltage, resistance and waveform for each pair of the terminals as 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
A56-1 (BATT) - D65-53 (E1) B - W-B Battery (for measuring battery voltage and for ECM memory) Always 11 to 14 V
A56-2 (+B) - D65-53 (E1) R - W-B Power source of ECM Engine switch on (IG) 11 to 14 V
A56-3 (+B2) - D65-53 (E1) R - W-B Power source of ECM Engine switch on (IG) 11 to 14 V
A56-4 (IGSW) - D65-53 (E1) B - W-B Engine switch Engine switch on (IG) 11 to 14 V
A56-7 (IREL) - D65-53 (E1) G - W-B INJ relay operation signal Engine stopped, engine switch on (IG) 0 to 1.5 V
A56-8 (+BM) - D65-53 (E1) P - W-B Power source of throttle actuator Always 11 to 14 V
A56-12 (CANP) - D65-53 (E1) G - W-B CAN communication line Engine stopped, engine switch on (IG)

Pulse generation

(See waveform 1)
A56-13 (CANH) - D65-53 (E1) GR - W-B CAN communication line Engine stopped, engine switch on (IG)

Pulse generation

(See waveform 1)
A56-14 (EC) - Body ground W-B - - Ground Always Below 1 Ω
A56-18 (FPC) - D65-53 (E1) L - W-B Fuel pump control Engine stopped, engine switch on (IG) Below 1.5 V
A56-25 (CANN) - D65-53 (E1) W - W-B CAN communication line Engine stopped, engine switch on (IG)

Pulse generation

(See waveform 2)
A56-26 (CANL) - D65-53 (E1) W - W-B CAN communication line Engine stopped, engine switch on (IG)

Pulse generation

(See waveform 2)
A56-27 (STP) - D65-53 (E1) R - W-B Stop light switch assembly signal Brake pedal depressed 7.5 to 14 V
Brake pedal released Below 1.5 V
A56-30 (NEO) - D65-53 (E1) W - W-B Engine speed signal sent to other ECUs Idling with warm engine

Pulse generation

(See waveform 3)
A56-31 (TACH) - D65-53 (E1) GR - W-B Engine speed signal Idling with warm engine

Pulse generation

(See waveform 4)
A56-32 (E0M) - Body ground W-B - - Ground Always Below 1 Ω
A56-33 (TC) - D65-53 (E1) GR - W-B Terminal TC of DLC3 Engine stopped, engine switch on (IG) 11 to 14 V
A56-39 (SPD) - D65-53 (E1) SB - W-B Vehicle speed signal from combination meter assembly Driving at 20 km/h (12 mph)

Pulse generation

(See waveform 5)
A56-42 (ST1-) - D65-53 (E1) BR - W-B Stop light switch assembly signal (opposite to STP terminal) Engine switch on (IG), brake pedal depressed 0 to 1.5 V
Engine switch on (IG), brake pedal released 7.5 to 14 V
A56-43 (STA) - D65-53 (E1) B - W-B Starter assembly signal Cranking 6.0 V or higher
A56-46 (MREL) - D65-53 (E1) Y - W-B EFI-MAIN NO. 1 relay operation signal Engine switch on (IG) 11 to 14 V
A56-47 (VPA) - A56-48 (EPA) V - B 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
A56-49 (VCPA) - A56-48 (EPA) W - B Power source of accelerator pedal position sensor (for VPA) Engine stopped, engine switch on (IG) 4.5 to 5.5 V
A56-50 (VPA2) - A56-51 (EPA2) P - G 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
A56-52 (VCP2) - A56-51 (EPA2) L - G Power source of accelerator pedal position sensor (for VPA2) Engine stopped, engine switch on (IG) 4.5 to 5.5 V
A56-58 (KSW) - D65-53 (E1) L - W-B Key in vehicle signal Engine switch off → on (IG) 0 to 3.0 V
D65-2 (OE2+) - D65-3 (OE2-) W - G Cam timing oil control solenoid assembly (for exhaust camshaft of bank 2) operation signal Idling

Pulse generation

(See waveform 6)
D65-4 (OE1+) - D65-5 (OE1-) LG - B Cam timing oil control solenoid assembly (for exhaust camshaft of bank 1) operation signal Idling

Pulse generation

(See waveform 6)
D65-9 (OC2+) - D65-8 (OC2-) LG - L Cam timing oil control solenoid assembly (for intake camshaft of bank 2) operation signal Idling

Pulse generation

(See waveform 7)
D65-16 (HA2B) - D65-53 (E1) GR - W-B Air fuel ratio sensor (bank 2 sensor 2) heater operation signal Idling

Pulse generation

(See waveform 8)
Engine switch on (IG) 11 to 14 V
D65-17 (HA2A) - D65-53 (E1) R - W-B Air fuel ratio sensor (bank 2 sensor 1) heater operation signal Idling

Pulse generation

(See waveform 8)
Engine switch on (IG) 11 to 14 V
D65-18 (+BD2) - D65-53 (E1) W - W-B Power source of ECM (injector driver) Engine stopped, engine switch on (IG) 11 to 14 V
D65-19 (+BD1) - D65-53 (E1) B - W-B Power source of ECM (injector driver) Engine stopped, engine switch on (IG) 11 to 14 V
D65-20 (E02) - Body ground W-B - - Ground Always Below 1 Ω
D65-21 (E04) - Body ground W-B - - Ground Always Below 1 Ω
D65-23 (FP1+) - D65-22 (FP1-) R - G Fuel pump assembly (for high pressure side) signal Idling with warm engine Pulse generation
D65-24 (#6D+) - D65-54 (#6D-) L - G No. 6 fuel injector assembly (for direct injection) signal Idling with warm engine, Data List item "Injection Mode" displays "Direct" Pulse generation
D65-25 (#3D+) - D65-26 (#3D-) R - Y No. 3 fuel injector assembly (for direct injection) signal Idling with warm engine, Data List item "Injection Mode" displays "Direct" Pulse generation
D65-27 (#5D+) - D65-57 (#5D-) L - G No. 5 fuel injector assembly (for direct injection) signal Idling with warm engine, Data List item "Injection Mode" displays "Direct" Pulse generation
D65-28 (#2D+) - D65-58 (#2D-) B - W No. 2 fuel injector assembly (for direct injection) signal Idling with warm engine, Data List item "Injection Mode" displays "Direct" Pulse generation
D65-29 (#4D+) - D65-59 (#4D-) R - Y No. 4 fuel injector assembly (for direct injection) signal Idling with warm engine, Data List item "Injection Mode" displays "Direct" Pulse generation
D65-30 (#1D+) - D65-60 (#1D-) B - W No. 1 fuel injector assembly (for direct injection) signal Idling with warm engine, Data List item "Injection Mode" displays "Direct" Pulse generation
D65-34 (IGT6) - D65-53 (E1) W - W-B No. 6 ignition coil assembly signal (ignition signal) Idling with warm engine

Pulse generation

(See waveform 9)
D65-35 (IGT4) - D65-53 (E1) SB - W-B No. 4 ignition coil assembly signal (ignition signal) Idling with warm engine

Pulse generation

(See waveform 9)
D65-36 (IGT2) - D65-53 (E1) L - W-B No. 2 ignition coil assembly signal (ignition signal) Idling with warm engine

Pulse generation

(See waveform 9)
D65-38 (OC1+) - D65-68 (OC1-) W - R Cam timing oil control solenoid assembly (for intake camshaft of bank 1) operation signal Idling

Pulse generation

(See waveform 7)
D65-40 (#60) - D65-51 (E01) GR - W-B No. 6 fuel injector assembly (for port injection) signal Engine switch on (IG) 0 to 5 V
Idling with warm engine, Data List item "Injection Mode" displaying "Port"

Pulse generation

(See waveform 10)
D65-41 (#30) - D65-51 (E01) L - W-B No. 3 fuel injector assembly (for port injection) signal Engine switch on (IG) 0 to 5 V
Idling with warm engine, Data List item "Injection Mode" displaying "Port"

Pulse generation

(See waveform 10)
D65-42 (#50) - D65-51 (E01) P - W-B No. 5 fuel injector assembly (for port injection) signal Engine switch on (IG) 0 to 5 V
Idling with warm engine, Data List item "Injection Mode" displaying "Port"

Pulse generation

(See waveform 10)
D65-43 (#20) - D65-51 (E01) G - W-B No. 2 fuel injector assembly (for port injection) signal Engine switch on (IG) 0 to 5 V
Idling with warm engine, Data List item "Injection Mode" displaying "Port"

Pulse generation

(See waveform 10)
D65-44 (#40) - D65-51 (E01) BR - W-B No. 4 fuel injector assembly (for port injection) signal Engine switch on (IG) 0 to 5 V
Idling with warm engine, Data List item "Injection Mode" displaying "Port"

Pulse generation

(See waveform 10)
D65-45 (#10) - D65-51 (E01) Y - W-B No. 1 fuel injector assembly (for port injection) signal Engine switch on (IG) 0 to 5 V
Idling with warm engine, Data List item "Injection Mode" displaying "Port"

Pulse generation

(See waveform 10)
D65-46 (E05) - Body ground W-B - - Ground Always Below 1 Ω
D65-47 (M-) - D65-49 (ME01) G - W-B Throttle actuator operation signal (negative signal) Idling with warm engine

Pulse generation

(See waveform 11)
D65-48 (M+) - D65-49 (ME01) L - W-B Throttle actuator operation signal (positive terminal) Idling with warm engine

Pulse generation

(See waveform 12)
D65-49 (ME01) - Body ground W-B - - Ground Always Below 1 Ω
D65-50 (HA1B) - D65-53 (E1) L - W-B Air fuel ratio sensor (bank 1 sensor 2) heater operation signal Idling

Pulse generation

(See waveform 8)
Engine switch on (IG) 11 to 14 V
D65-51 (E01) - Body ground W-B - - Ground Always Below 1 Ω
D65-52 (HA1A) - D65-53 (E1) L - W-B Air fuel ratio sensor (bank 1 sensor 1) heater operation signal Idling

Pulse generation

(See waveform 8)
Engine switch on (IG) 11 to 14 V
D65-53 (E1) - Body ground W-B - - Ground Always Below 1 Ω
D65-55 (E1D2) - Body ground W-B - - Ground Always Below 1 Ω
D65-56 (E1D1) - Body ground W-B - - Ground Always Below 1 Ω
D65-64 (PTCR) - D65-53 (E1) Y - W-B Thermostat heater operation signal Engine switch on (IG) 11 to 14 V
D65-65 (PRG) - D65-53 (E1) R - W-B Purge VSV operation signal Engine switch on (IG) 11 to 14 V
Idling

Pulse generation

(See waveform 13)
D65-69 (IGT5) - D65-53 (E1) P - W-B No. 5 ignition coil assembly signal (ignition signal) Idling with warm engine

Pulse generation

(See waveform 9)
D65-70 (IGT3) - D65-53 (E1) V - W-B No. 3 ignition coil assembly signal (ignition signal) Idling with warm engine

Pulse generation

(See waveform 9)
D65-71 (IGT1) - D65-53 (E1) LG - W-B No. 1 ignition coil assembly signal (ignition signal) Idling with warm engine

Pulse generation

(See waveform 9)
D65-80 (IGF2) - D65-53 (E1) GR - W-B Ignition coil assembly (ignition confirmation signal) Engine switch on (IG) 4.5 to 5.5 V
Idling with warm engine

Pulse generation

(See waveform 9)
D65-82 (KNK1) - D65-81 (EKNK) B - W Knock control sensor (bank 1) signal Engine speed maintained at 4000 rpm after warming up engine

Pulse generation

(See waveform 14)
D65-86 (THO1) - D65-133 (ETHW) G - BR ATF temperature sensor signal ATF temperature 115°C (239°F) or higher Below 1.5 V
D65-87 (PR) - D65-133 (ETHW) V - BR Fuel pressure sensor (for high pressure side) signal Idling with warm engine 0.5 to 4.5 V
D65-89 (VTA2) - D65-120 (ETA) P - W Throttle position sensor signal (for sensor malfunction detection) Engine switch on (IG), accelerator pedal fully released 2.1 to 3.1 V
Accelerator pedal fully depressed (engine running) 4.6 to 5.0 V
D65-90 (VC) - D65-53 (E1) L - W-B Power source for sensor (specific voltage) Engine switch on (IG) 4.5 to 5.5 V
D65-91 (A2B+) - D65-53 (E1) B - W-B Air fuel ratio sensor (bank 2 sensor 2) signal Engine stopped, engine switch on (IG) 2.8 to 3.4 V*
D65-92 (A2B-) - D65-53 (E1) W - W-B Air fuel ratio sensor (bank 2 sensor 2) signal Engine stopped, engine switch on (IG) 3.2 to 3.8 V*
D65-93 (A1B+) - D65-53 (E1) R - W-B Air fuel ratio sensor (bank 1 sensor 2) signal Engine stopped, engine switch on (IG) 2.8 to 3.4 V*
D65-94 (A1B-) - D65-53 (E1) G - W-B Air fuel ratio sensor (bank 1 sensor 2) signal Engine stopped, engine switch on (IG) 3.2 to 3.8 V*
D65-96 (VCNE) - D65-53 (E1) W - W-B Power source of crankshaft position sensor (specific voltage) Engine switch on (IG) 4.5 to 5.5 V
D65-101 (THW) - D65-133 (ETHW) R - BR Engine coolant temperature sensor Idling, engine coolant temperature 75 to 100°C (167 to 212°F) 0.2 to 1.0 V
D65-102 (THA) - D65-115 (E2G) G - W Intake air temperature sensor Idling, intake air temperature 0 to 80°C (32 to 176°F) 0.5 to 3.4 V
D65-112 (IGF1) - D65-53 (E1) G - W-B Ignition coil assembly (ignition confirmation signal) Engine switch on (IG) 4.5 to 5.5 V
Idling with warm engine

Pulse generation

(See waveform 9)
D65-114 (KNK2) - D65-113 (EKN2) R - G Knock control sensor (bank 2) signal Engine speed maintained at 4000 rpm after warming up engine

Pulse generation

(See waveform 14)
D65-116 (VG) - D65-115 (E2G) P - W Mass air flow meter sub-assembly signal Engine switch on (IG)

Pulse generation

(See waveform 15)
D65-121 (VCTA) - D65-120 (ETA) R - W Power source of throttle position sensor (specific voltage) Engine stopped, engine switch on (IG) 4.5 to 5.5 V
D65-122 (VTA1) - D65-120 (ETA) V - W Throttle position sensor signal (for engine control) Engine switch on (IG), accelerator pedal fully released 0.5 to 1.1 V
Accelerator pedal fully depressed (engine running) 3.2 to 4.8 V
D65-123 (A2A+) - D65-53 (E1) B - W-B Air fuel ratio sensor (bank 2 sensor 1) signal Engine switch on (IG) 3.3 V*
D65-124 (A2A-) - D65-53 (E1) W - W-B Air fuel ratio sensor (bank 2 sensor 1) signal Engine switch on (IG) 2.9 V*
D65-125 (A1A+) - D65-53 (E1) R - W-B Air fuel ratio sensor (bank 1 sensor 1) signal Engine switch on (IG) 3.3 V*
D65-126 (A1A-) - D65-53 (E1) G - W-B Air fuel ratio sensor (bank 1 sensor 1) signal Engine switch on (IG) 2.9 V*
D65-127 (GE01) - Body ground BR - - Shielded earth (ground) circuit of throttle actuator Always Below 1 Ω
D65-128 (NE+) - D65-95 (NE-) R - B Crankshaft position sensor Idling with warm engine

Pulse generation

(See waveform 16)
D65-129 (VV2+) - D65-133 (ETHW) GR - BR VVT sensor (for intake camshaft of bank 2) signal Idling

Pulse generation

(See waveform 17)
D65-130 (EV2+) - D65-133 (ETHW) LG - BR VVT sensor (for exhaust camshaft of bank 2) signal Idling

Pulse generation

(See waveform 18)
D65-131 (EV1+) - D65-133 (ETHW) SB - BR VVT sensor (for exhaust camshaft of bank 1) signal Idling

Pulse generation

(See waveform 18)
D65-132 (VV1+) - D65-133 (ETHW) Y - BR VVT sensor (for intake camshaft of bank 1) signal Idling

Pulse generation

(See waveform 17)
D65-134 (PFL) - D65-133 (ETHW) B - BR Fuel pressure sensor (for low pressure side) signal Idling with warm engine 0.75 to 4.5 V
D65-135 (LIN) - D65-53 (E1) V - W-B LIN communication line Engine switch on (IG)

Pulse generation

(See waveform 19)
D65-136 (RFC) - D65-53 (E1) GR - W-B Cooling fan control signal Engine switch on (IG), A/C switch on (max cool)

Pulse generation

(See waveform 20)

*: The ECM terminal voltage is constant regardless of the voltage output from the sensor.


  1. WAVEFORM 1

    B006BKOE01
    *a 1 V/DIV.
    *b 10 μs./DIV.
    CAN Communication Signal (Reference)
    ECM Terminal Name

    Between CANH and E1

    Between CANP and E1
    Tester Range 1 V/DIV., 10 μs./DIV.
    Condition Engine stopped, engine switch on (IG)

    Tech Tips

    The waveform varies depending on the CAN communication signal.

  2. WAVEFORM 2

    B006F9VE01
    *a 1 V/DIV.
    *b 10 μs./DIV.
    CAN Communication Signal (Reference)
    ECM Terminal Name

    Between CANL and E1

    Between CANN and E1
    Tester Range 1 V/DIV., 10 μs./DIV.
    Condition Engine stopped, engine switch on (IG)

    Tech Tips

    The waveform varies depending on the CAN communication signal.

  3. WAVEFORM 3

    B006D5XE02
    *a 1 V/DIV.
    *b 2 ms./DIV.
    Engine Speed 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 speed increases.

  4. WAVEFORM 4

    B006AT5E01
    *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.

  5. WAVEFORM 5

    B006F2AE11
    *a 2 V/DIV.
    *b 20 ms./DIV.
    Vehicle Speed Signal
    ECM Terminal Name Between SPD and E1
    Tester Range 2 V/DIV., 20 ms./DIV.
    Condition Driving at 20 km/h (12 mph)

    Tech Tips

    The wavelength becomes shorter as the vehicle speed increases.

  6. WAVEFORM 6

    B006GLQE01
    *a 5 V/DIV.
    *b 1 ms./DIV.
    Cam Timing Oil Control Solenoid Assembly (for Exhaust Camshaft) Signal
    ECM Terminal Name

    Between OE1+ and OE1-

    Between OE2+ and OE2-
    Tester Range 5 V/DIV., 1 ms./DIV.
    Condition Idling

  7. WAVEFORM 7

    B006GLQE01
    *a 5 V/DIV.
    *b 1 ms./DIV.
    Cam Timing Oil Control Solenoid Assembly (for Intake Camshaft) Signal
    ECM Terminal Name

    Between OC1+ and OC1-

    Between OC2+ and OC2-
    Tester Range 5 V/DIV., 1 ms./DIV.
    Condition Idling

  8. WAVEFORM 8

    B0069S0E04
    *a 5 V/DIV.
    *b 10 ms./DIV.
    Air Fuel Ratio Sensor Heater Operation Signal
    ECM Terminal Name

    Between HA1A and E1

    Between HA2A and E1

    Between HA1B and E1

    Between HA2B and E1
    Tester Range 5 V/DIV., 10 ms./DIV.
    Condition Idling

  9. WAVEFORM 9

    B006ATGE01
    *a 2 V/DIV.
    *b 20 ms./DIV.
    Ignition Coil Assembly Signal (IGT and IGF Signal)
    ECM Terminal Name

    CH1: Between IGT (1 to 6) and E1

    CH2: Between IGF (1 or 2) and E1
    Tester Range 2 V/DIV., 20 ms./DIV.
    Condition Idling with warm engine

  10. WAVEFORM 10

    B006A91E11
    *1 20 V/DIV.
    *2 20 ms./DIV.
    No. 1 (to No. 6) 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 with warm engine, Data List item "Injection Mode" displaying "Port"

    Tech Tips


    • The wavelength becomes shorter as the engine speed increases.

    • When the port injection injectors are operating, Port is displayed for Injection Way of the Data List.

  11. WAVEFORM 11

    B006G8QE22
    *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.

  12. WAVEFORM 12

    B006DDCE20
    *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.

  13. WAVEFORM 13

    B006D07E05
    *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

    Tech Tips

    If the waveform is not similar to the illustration, check the waveform again after idling for 10 minutes or more.

  14. WAVEFORM 14

    B006BURE01
    *a 1 V/DIV.
    *b 1 ms./DIV.
    Knock Control Sensor Signal
    ECM Terminal Name

    Between KNK1 and EKNK

    Between KNK2 and EKN2
    Tester Range 1 V/DIV., 1 ms./DIV.
    Condition Engine speed maintained at 4000 rpm after warming up engine

    Tech Tips


    • The wavelength becomes shorter as the engine speed increases.

    • The waveforms and amplitudes displayed will differ slightly depending on the vehicle.

  15. WAVEFORM 15

    B006A4KE05
    *a 1 V/DIV.
    *b 100 μs./DIV.
    Mass Air Flow Meter Sub-assembly Signal
    ECM Terminal Name Between VG and E2G
    Tester Range 1 V/DIV., 100 μs./DIV.
    Condition Engine switch on (IG)

  16. WAVEFORM 16

    B006AZ0E03
    *a 2 V/DIV.
    *b 20 ms./DIV.
    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 speed increases.

  17. WAVEFORM 17

    B006G6PE02
    *a 5 V/DIV.
    *b 20 ms./DIV.
    VVT Sensor (for Intake Camshaft) Signal
    ECM Terminal Name

    CH1: Between VV1+ and ETHW

    CH2: Between VV2+ and ETHW
    Tester Range 5 V/DIV., 20 ms./DIV.
    Condition Idling

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  18. WAVEFORM 18

    B0069T9E02
    *a 5 V/DIV.
    *b 20 ms./DIV.
    VVT Sensor (for Exhaust Camshaft) Signal
    ECM Terminal Name

    CH1: Between EV1+ and ETHW

    CH2: Between EV2+ and ETHW
    Tester Range 5 V/DIV., 20 ms./DIV.
    Condition Idling

    Tech Tips

    The wavelength becomes shorter as the engine speed increases.

  19. WAVEFORM 19

    B006GBIE01
    *a 2 V/DIV.
    *b 10 msec./DIV.
    LIN Communication Signal
    ECM Terminal Name Between LIN and E1
    Tester Range 2 V/DIV., 10 msec./DIV.
    Condition Engine stopped, engine switch on (IG)

    Tech Tips

    The waveform varies depending on the LIN communication signal.

  20. WAVEFORM 20

    B006AESE08
    *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.