SFI SYSTEM(w/o Canister Pump Module) TERMINALS OF ECM
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 |
|---|---|---|---|---|
| A58-1 (BATT) - G1-53 (E1) | B - W-B | Auxiliary battery (for measuring auxiliary battery voltage and for ECM memory) | Power switch off | 11 to 16 V |
| A58-2 (+B) - G1-53 (E1) | P - W-B | Power source of ECM | Engine stopped, power switch on (IG) | 11 to 14 V |
| A58-3 (+B2) - G1-53 (E1) | P - W-B | Power source of ECM | Engine stopped, power switch on (IG) | 11 to 14 V |
| A58-4 (IGSW) - G1-53 (E1) | B - W-B | Power switch signal | Engine stopped, power switch on (IG) | 11 to 14 V |
| A58-7 (IREL) - G1-53 (E1) | B - W-B | EDU relay operation signal | Power switch on (IG) | 0 to 1.5 V |
| A58-8 (+BM) - G1-53 (E1) | P - W-B | Power source of throttle actuator | Power switch off | 11 to 16 V |
| A58-12 (CAN+) - G1-53 (E1) | B - W-B | CAN communication line | Engine stopped, power switch on (IG) | Pulse generation (See waveform 1) |
| A58-13 (CANH) - G1-53 (E1) | B - W-B | CAN communication line | Engine stopped, power switch on (IG) | Pulse generation (See waveform 1) |
| A58-14 (EC) - Body ground | W-B - - | Ground | Always | Below 1 Ω |
| A58-18 (FPC) - G1-53 (E1) | Y - W-B | Fuel pump control signal | Engine stopped, power switch on (IG) | Below 1.5 V |
| A58-25 (CAN-) - G1-53 (E1) | W - W-B | CAN communication line | Engine stopped, power switch on (IG) | Pulse generation (See waveform 2) |
| A58-26 (CANL) - G1-53 (E1) | W - W-B | CAN communication line | Engine stopped, power switch on (IG) | Pulse generation (See waveform 2) |
| A58-30 (NEO) - G1-53 (E1) | B - W-B | Crankshaft revolution signal | Idling with warm engine | Pulse generation (See waveform 3) |
| A58-31 (TACH) - G1-53 (E1) | B - W-B | Engine speed signal | Idling with warm engine | Pulse generation (See waveform 4) |
| A58-45 (G2O) - G1-53 (E1) | W - W-B | Camshaft revolution signal | Idling with warm engine | Pulse generation (See waveform 5) |
| A58-46 (MREL) - G1-53 (E1) | V - W-B | EFI-MAIN NO. 1 relay operation signal | Engine stopped, power switch on (IG) | 11 to 14 V |
| A58-60 (RFC) - G1-53 (E1) | G - W-B | Cooling fan control signal | Power switch on (IG), A/C ON (Max Cool) | Pulse generation (see waveform 6) |
| G1-2 (OE2+) - G1-3 (OE2-) | W - G | Cam timing oil control solenoid assembly (for exhaust camshaft of bank 2) operation signal | Idling | Pulse generation (see waveform 7) |
| G1-4 (OE1+) - G1-5 (OE1-) | LG - B | Cam timing oil control solenoid assembly (for exhaust camshaft of bank 1) operation signal | Idling | Pulse generation (see waveform 7) |
| G1-9 (OC2+) - G1-8 (OC2-) | B - L | Cam timing oil control solenoid assembly (for intake camshaft of bank 2) operation signal | Idling | Pulse generation (see waveform 7) |
| G1-11 (OC1+) - G1-10 (OC1-) | B - R | Cam timing oil control solenoid assembly (for intake camshaft of bank 1) operation signal | Idling | Pulse generation (see waveform 7) |
| G1-12 (EGR4) - G1-53 (E1) | G - W-B | EGR valve assembly signal | EGR valve assembly operating | Pulse generation (see waveform 8) |
| G1-13 (EGR2) - G1-53 (E1) | L - W-B | EGR valve assembly signal | EGR valve assembly operating | Pulse generation (see waveform 8) |
| G1-14 (EGR1) - G1-53 (E1) | R - W-B | EGR valve assembly signal | EGR valve assembly operating | Pulse generation (see waveform 9) |
| G1-15 (EGR3) - G1-53 (E1) | W - W-B | EGR valve assembly signal | EGR valve assembly operating | Pulse generation (see waveform 9) |
| G1-16 (HA2B) - G1-46 (E05) | GR - W-B | Air fuel ratio sensor (bank 2 sensor 2) heater operation signal | Idling with cold engine | 0 to 3 V |
| Power switch on (IG) | 11 to 14 V | |||
| G1-17 (HA2A) - G1-46 (E05) | P - W-B | Air fuel ratio sensor (bank 2 sensor 1) heater operation signal | Idling with cold engine | Pulse generation (see waveform 10) |
| Power switch on (IG) | 11 to 14 V | |||
| G1-18 (+BD2) - G1-53 (E1) | W - W-B | Power source of ECU (injector driver) | Engine stopped, power switch on (IG) | 11 to 14 V |
| G1-19 (+BD1) - G1-53 (E1) | B - W-B | Power source of ECU (injector driver) | Engine stopped, power switch on (IG) | 11 to 14 V |
| G1-20 (E02) - Body ground | W-B - - | Ground | Always | Below 1 Ω |
| G1-21 (E04) - Body ground | W-B - - | Ground | Always | Below 1 Ω |
| G1-23 (FP1+) - G1-22 (FP1-) | B - W | Fuel pump assembly (for high pressure side) signal | Engine started | Pulse generation |
| G1-24 (#6D+) - G1-54 (#6D-) | L - G | No. 6 fuel injector assembly (for direct injection) signal | Idling with warm engine, Data List item "Injection Mode" displaying "Direct" | Pulse generation |
| G1-25 (#3D+) - G1-26 (#3D-) | R - Y | No. 3 fuel injector assembly (for direct injection) signal | Idling with warm engine, Data List item "Injection Mode" displaying "Direct" | Pulse generation |
| G1-27 (#5D+) - G1-57 (#5D-) | L - G | No. 5 fuel injector assembly (for direct injection) signal | Idling with warm engine, Data List item "Injection Mode" displaying "Direct" | Pulse generation |
| G1-28 (#2D+) - G1-58 (#2D-) | B - W | No. 2 fuel injector assembly (for direct injection) signal | Idling with warm engine, Data List item "Injection Mode" displaying "Direct" | Pulse generation |
| G1-29 (#4D+) - G1-59 (#4D-) | R - Y | No. 4 fuel injector assembly (for direct injection) signal | Idling with warm engine, Data List item "Injection Mode" displaying "Direct" | Pulse generation |
| G1-30 (#1D+) - G1-60 (#1D-) | B - W | No. 1 fuel injector assembly (for direct injection) signal | Idling with warm engine, Data List item "Injection Mode" displaying "Direct" | Pulse generation |
| G1-35 (IGF2) - G1-53 (E1) | V - W-B | Ignition coil assembly signal (ignition confirmation signal) | Power switch on (IG) | 4.5 to 5.5 V |
| Idling with warm engine | Pulse generation (see waveform 11) |
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| G1-36 (IGF1) - G1-53 (E1) | G - W-B | Ignition coil assembly signal (ignition confirmation signal) | Power switch on (IG) | 4.5 to 5.5 V |
| Idling with warm engine | Pulse generation (see waveform 11) |
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| G1-40 (#60) - G1-51 (E01) | GR - W-B | No. 6 fuel injector assembly (for port injection) signal | Idling with warm engine | Pulse generation (see waveform 12) |
| G1-41 (#30) - G1-51 (E01) | L - W-B | No. 3 fuel injector assembly (for port injection) signal | Idling with warm engine | Pulse generation (see waveform 12) |
| G1-42 (#50) - G1-51 (E01) | P - W-B | No. 5 fuel injector assembly (for port injection) signal | Idling with warm engine | Pulse generation (see waveform 12) |
| G1-43 (#20) - G1-51 (E01) | G - W-B | No. 2 fuel injector assembly (for port injection) signal | Idling with warm engine | Pulse generation (see waveform 12) |
| G1-44 (#40) - G1-51 (E01) | BR - W-B | No. 4 fuel injector assembly (for port injection) signal | Idling with warm engine | Pulse generation (see waveform 12) |
| G1-45 (#10) - G1-51 (E01) | Y - W-B | No. 1 fuel injector assembly (for port injection) signal | Idling with warm engine | Pulse generation (see waveform 12) |
| G1-46 (E05) - Body ground | W-B - - | Ground | Always | Below 1 Ω |
| G1-47 (M-) - G1-49 (ME01) | L - W-B | Throttle actuator operation signal (negative terminal) | Idling with warm engine | Pulse generation (see waveform 13) |
| G1-48 (M+) - G1-49 (ME01) | G - W-B | Throttle actuator operation signal (positive terminal) | Idling with warm engine | Pulse generation (see waveform 14) |
| G1-49 (ME01) - Body ground | W-B - - | Ground | Always | Below 1 Ω |
| G1-50 (HA1B) - G1-21 (E04) | LG - W-B | Air fuel ratio sensor (bank 1 sensor 2) heater operation signal | Idling with cold engine | 0 to 3 V |
| Power switch on (IG) | 11 to 14 V | |||
| G1-51 (E01) - Body ground | W-B - - | Ground | Always | Below 1 Ω |
| G1-52 (HA1A) - G1-21 (E04) | L - W-B | Air fuel ratio sensor (bank 1 sensor 1) heater operation signal | Engine stopped, power switch on (IG) | 11 to 14 V |
| Idling with cold engine | Pulse generation (see waveform 10) |
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| G1-53 (E1) - Body ground | W-B - - | Ground | Always | Below 1 Ω |
| G1-55 (E1D2) - Body ground | W-B - - | Ground | Always | Below 1 Ω |
| G1-56 (E1D1) - Body ground | W-B - - | Ground | Always | Below 1 Ω |
| G1-65 (PRG) - G1-53 (E1) | L - W-B | Purge VSV operation signal | Engine stopped, power switch on (IG) | 11 to 14 V |
| Idling with warm engine, under purge control | Pulse generation (see waveform 15) |
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| G1-69 (IGT5) - G1-53 (E1) | P - W-B | No. 5 ignition coil assembly signal (ignition signal) |
Idling with warm engine | Pulse generation (see waveform 11) |
| G1-70 (IGT3) - G1-53 (E1) | V - W-B | No. 3 ignition coil assembly signal (ignition signal) |
Idling with warm engine | Pulse generation (see waveform 11) |
| G1-71 (IGT1) - G1-53 (E1) | LG - W-B | No. 1 ignition coil assembly signal (ignition signal) |
Idling with warm engine | Pulse generation (see waveform 11) |
| G1-73 (IGT6) - G1-53 (E1) | W - W-B | No. 6 ignition coil assembly signal (ignition signal) |
Idling with warm engine | Pulse generation (see waveform 11) |
| G1-74 (IGT4) - G1-53 (E1) | SB - W-B | No. 4 ignition coil assembly signal (ignition signal) |
Idling with warm engine | Pulse generation (see waveform 11) |
| G1-75 (IGT2) - G1-53 (E1) | L - W-B | No. 2 ignition coil assembly signal (ignition signal) |
Idling with warm engine | Pulse generation (see waveform 11) |
| G1-77 (VCPM) - G1-53 (E1) | W - W-B | Power source of manifold absolute pressure sensor | Engine stopped, power switch on (IG) | 4.75 to 5.25 V |
| G1-78 (PIM) - G1-76 (EPIM) | R - L | Manifold absolute pressure sensor signal | Engine stopped, power switch on (IG) | 3.0 to 4.5 V |
| G1-79 (PFL) - G1-112 (EPFL) | B - BR | Fuel pressure sensor (for low pressure side) signal | Idling with warm engine | 0.75 to 4.5 V |
| G1-82 (KNK1) - G1-81 (EKNK) | B - W | Knock control sensor (bank 1) signal | Engine speed maintained at 2500 rpm after warming up engine | Pulse generation (see waveform 16) |
| G1-87 (PR) - G1-88 (EPR) | GR - BR | Fuel pressure sensor (for high pressure side) signal | Idling with warm engine | 0.5 to 4.5 V |
| G1-89 (VTA2) - G1-120 (ETA) | LG - R | Throttle position sensor signal (for sensor malfunction detection) | Engine stopped, power switch on (IG), accelerator pedal fully released | 2.1 to 3.1 V |
| G1-90 (VCVG) - G1-115 (E2G) | B - W | Power source of mass air flow meter sub-assembly | Power switch on (IG) | 4.8 to 5.2 V |
| G1-91 (A2B+) - G1-53 (E1) | B - W-B | Air fuel ratio sensor (bank 2 sensor 2) signal | Engine stopped, power switch on (IG) | 2.8 to 3.4 V* |
| G1-92 (A2B-) - G1-53 (E1) | W - W-B | Air fuel ratio sensor (bank 2 sensor 2) signal | Engine stopped, power switch on (IG) | 3.2 to 3.8 V* |
| G1-93 (A1B+) - G1-53 (E1) | R - W-B | Air fuel ratio sensor (bank 1 sensor 2) signal | Engine stopped, power switch on (IG) | 2.8 to 3.4 V* |
| G1-94 (A1B-) - G1-53 (E1) | G - W-B | Air fuel ratio sensor (bank 1 sensor 2) signal | Engine stopped, power switch on (IG) | 3.2 to 3.8 V* |
| G1-96 (VCNE) - G1-53 (E1) | R - W-B | Power source of crankshaft position sensor | Power switch on (IG) | 4.5 to 5.5 V |
| G1-98 (VCV2) - G1-53 (E1) | P - W-B | Power source of VVT sensor (for intake camshaft of bank 2) | Power switch on (IG) | 4.5 to 5.5 V |
| G1-99 (VCV1) - G1-53 (E1) | L - W-B | Power source of VVT sensor (for intake camshaft of bank 1) | Power switch on (IG) | 4.5 to 5.5 V |
| G1-101 (THW) - G1-133 (ETHW) | V - BR | Engine coolant temperature sensor signal | Idling, engine coolant temperature 75 to 100°C (167 to 212°F) | 0.2 to 1.0 V |
| G1-102 (THA) - G1-115 (E2G) | G - W | Intake air temperature sensor (mass air flow meter sub-assembly) signal | Idling, intake air temperature 0 to 80°C (32 to 176°F) | 0.5 to 3.4 V |
| G1-111 (VCPF) - G1-53 (E1) | Y - W-B | Power source of fuel pressure sensor (for low pressure side) | Power switch on (IG) | 4.75 to 5.25 V |
| G1-114 (KNK2) - G1-113 (EKN2) | R - G | Knock control sensor (bank 2) signal | Engine speed maintained at 2500 rpm after warming up engine | Pulse generation (see waveform 16) |
| G1-116 (VG) - G1-115 (E2G) | R - W | Mass air flow meter sub-assembly signal | Power switch on (IG) | Pulse generation (see waveform 17) |
| G1-119 (VCPR) - G1-53 (E1) | L - W-B | Power source of fuel pressure sensor (for high pressure side) | Power switch on (IG) | 4.75 to 5.25 V |
| G1-121 (VCTA) - G1-120 (ETA) | G - R | Power source of throttle position sensor (specific voltage) | Engine stopped, power switch on (IG) | 4.5 to 5.5 V |
| G1-122 (VTA1) - G1-120 (ETA) | W - R | Throttle position sensor signal (for engine control) | Engine stopped, power switch on (IG), accelerator pedal fully released | 0.6 to 1.1 V |
| G1-123 (A2A+) - G1-53 (E1) | B - W-B | Air fuel ratio sensor (bank 2 sensor 1) signal | Engine stopped, power switch on (IG) | 3.0 to 3.6 V* |
| G1-124 (A2A-) - G1-53 (E1) | W - W-B | Air fuel ratio sensor (bank 2 sensor 1) signal | Engine stopped, power switch on (IG) | 2.7 to 3.3 V* |
| G1-125 (A1A+) - G1-53 (E1) | R - W-B | Air fuel ratio sensor (bank 1 sensor 1) signal | Engine stopped, power switch on (IG) | 3.0 to 3.6 V* |
| G1-126 (A1A-) - G1-53 (E1) | G - W-B | Air fuel ratio sensor (bank 1 sensor 1) signal | Engine stopped, power switch on (IG) | 2.7 to 3.3 V* |
| G1-127 (GE01) - Body ground | BR - - | Shielded (ground) circuit of throttle actuator | Always | Below 1 Ω |
| G1-128 (NE+) - G1-95 (NE-) | B - W | Crankshaft position sensor signal | Idling with warm engine | Pulse generation (see waveform 18) |
| G1-129 (VV2+) - G1-97 (VV2-) | GR - V | VVT sensor (for intake camshaft of bank 2) signal | Idling with warm engine | Pulse generation (see waveform 19) |
| G1-130 (EV2+) - G1-107 (EV2-) | G - Y | VVT sensor (for exhaust camshaft of bank 2) signal | Idling with warm engine | Pulse generation (see waveform 20) |
| G1-131 (EV1+) - G1-108 (EV1-) | SB - W | VVT sensor (for exhaust camshaft of bank 1) signal | Idling with warm engine | Pulse generation (see waveform 20) |
| G1-132 (VV1+) - G1-100 (VV1-) | Y - R | VVT sensor (for intake camshaft of bank 1) signal | Idling with warm engine | Pulse generation (see waveform 19) |
| G1-139 (VCE2) - G1-53 (E1) | B - W-B | Power source of VVT sensor (for exhaust camshaft of bank 2) | Power switch on (IG) | 4.5 to 5.5 V |
| G1-140 (VCE1) - G1-53 (E1) | L - W-B | Power source of VVT sensor (for exhaust camshaft of bank 1) | Power switch on (IG) | 4.5 to 5.5 V |
*: The ECM terminal voltage is constant regardless of the voltage output from the sensor.
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WAVEFORM 1
*a 1 V/DIV. *b 10 μs./DIV. CAN Communication Signal (Reference) ECM Terminal Name Between CAN+ and E1, or CANH and E1 Tester Range 1 V/DIV., 10 μs./DIV. Condition Engine stopped, power switch on (IG) Tech Tips
The waveform varies depending on the CAN communication signal.
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WAVEFORM 2
*a 1 V/DIV. *b 10 μs./DIV. CAN Communication Signal (Reference) ECM Terminal Name Between CAN- and E1, or CANL and E1 Tester Range 1 V/DIV., 10 μs./DIV. Condition Engine stopped, power switch on (IG) Tech Tips
The waveform varies depending on the CAN communication signal.
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WAVEFORM 3
*a 5 V/DIV. *b 20 ms./DIV. Crankshaft Revolution Signal from ECM to Inverter with Converter Assembly ECM Terminal Name Between NEO and E1 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 4
*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 5
*a 5 V/DIV. *b 20 ms./DIV. Camshaft Revolution Signal from ECM to Inverter with Converter Assembly ECM Terminal Name Between G2O and E1 Tester Range 5 V/DIV., 20 ms./DIV. Condition Idling with warm engine -
WAVEFORM 6
*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 ON (MAX Cool) Tech Tips
The duty ratio varies depending on the engine coolant temperature.
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WAVEFORM 7
*a 5 V/DIV. *b 1 ms./DIV. Cam Timing Oil Control Solenoid Assembly Operation Signal ECM Terminal Name Between OC1+ and OC1-, or OC2+ and OC2- Between OE1+ and OE1-, or OE2+ and OE2- Tester Range 5 V/DIV., 1 ms./DIV. Condition Idling -
WAVEFORM 8
*1 10 V/DIV. *2 20 ms./DIV. EGR Valve Assembly Signal (EGR2, EGR4) ECM Terminal Name CH1: EGR2 and E1
CH2: EGR4 and E1
Tester Range 10 V/DIV., 20 ms./DIV. Condition EGR valve assembly operating -
WAVEFORM 9
*1 10 V/DIV. *2 20 ms./DIV. EGR Valve Assembly Signal (EGR1, EGR3) ECM Terminal Name CH1: EGR1 and E1
CH2: EGR3 and E1
Tester Range 10 V/DIV., 20 ms./DIV. Condition EGR valve assembly operating -
WAVEFORM 10
*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 with cold engine -
WAVEFORM 11
*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 -
WAVEFORM 12
*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 with warm engine Tech Tips
The wavelength becomes shorter as the engine speed increases.
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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 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 15
*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 with warm engine, 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 16
*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 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 will differ slightly depending on the vehicle.
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WAVEFORM 17
*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 Power switch on (IG) -
WAVEFORM 18
*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.
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WAVEFORM 19
*a 5 V/DIV. *b 20 ms./DIV. VVT Sensor (for Intake Camshaft) Signal ECM Terminal Name CH1: Between VV1+ and VV1-
CH2: 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 20
*a 5 V/DIV. *b 20 ms./DIV. VVT Sensor (for Exhaust Camshaft) Signal ECM Terminal Name CH1: Between EV1+ and EV1-
CH2: 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 water pump speed increases.