SFI SYSTEM TERMINALS OF ECM
Tech Tips
The standard normal 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 normal 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 |
|---|---|---|---|---|
| A8-20 (BATT) - D41-104 (E1) | V - BR | Battery (for measuring battery voltage and for ECM memory) | Always | 11 to 14 V |
| A8-3 (+BM) - D41-104 (E1) | BR - BR | Power source of throttle actuator | Always | 11 to 14 V |
| A8-28 (IGSW) - D41-104 (E1) | L - BR | Engine switch | Engine switch on (IG) | 11 to 14 V |
| A8-2 (+B) - D41-104 (E1) | B - BR | Power source of ECM | Engine switch on (IG) | 11 to 14 V |
| A8-1 (+B2) - D41-104 (E1) | P - BR | Power source of ECM | Engine switch on (IG) | 11 to 14 V |
| D41-100 (OC1+) - D41-123 (OC1-) | P - V | Camshaft timing oil control valve | Idling with warm engine | Pulse generation (see waveform 1) |
| A8-44 (MREL) - D41-104 (E1) | GR - BR | EFI MAIN relay | Engine switch on (IG) | 11 to 14 V |
| D41-118 (VG) - D41-116 (E2G) | W - P | Mass air flow meter sub-assembly | Idling with warm engine, shift lever position P or N, A/C switch OFF | 0.5 to 3.0 V |
| D41-65 (THA) - D41-88 (ETHA) | R - V | Intake air temperature sensor (built into mass air flow meter sub-assembly) | Idling, intake air temperature 0 to 80°C (32 to 176°F) | 0.5 to 3.4 V |
| D41-97 (THW) - D41-96 (ETHW) | Y - B | Engine coolant temperature sensor | Idling, engine coolant temperature 60 to 120°C (140 to 248°F) | 0.2 to 1.0 V |
| D41-67 (VCTA) - D41-91 (ETA) | B - W | Power source of throttle position sensor (specific voltage) | Idling with warm engine | 4.5 to 5.5 V |
| D41-115 (VTA1) - D41-91 (ETA) | P - W | Throttle position sensor (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 |
3.2 to 4.8 V | |||
| D41-114 (VTA2) - D41-91 (ETA) | G - W | Throttle position sensor (for sensor malfunction detection) | Engine switch on (IG), Accelerator pedal fully released |
2.1 to 3.1 V |
| Engine switch on (IG), Accelerator pedal fully depressed |
4.6 to 5.0 V | |||
| A8-55 (VPA) - A8-59 (EPA) | V - R | Accelerator pedal position sensor (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 | |||
| A8-56 (VPA2) - A8-60 (EPA2) | Y - BR | Accelerator pedal position sensor (for sensor malfunctioning detection) | 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 | |||
| A8-57 (VCPA) - A8-59 (EPA) | P - R | Power source of accelerator pedal position sensor (for VPA) | Engine switch on (IG) | 4.5 to 5.5 V |
| A8-58 (VCP2) - A8-60 (EPA2) | B - BR | Power source of accelerator pedal position sensor (for VPA2) | Engine switch on (IG) | 4.5 to 5.5 V |
| D41-109 (HA1A) - D41-46 (E04) | B - BR | Air fuel ratio sensor heater | Engine switch on (IG) | 11 to 14 V |
| Idling | Below 3.0 V | |||
| D41-112 (A1A+) - D41-104 (E1) | B -BR | Air fuel ratio sensor | Engine switch on (IG) | 3.3 V*1 |
| D41-113 (A1A-) - D41-104 (E1) | W - BR | Air fuel ratio sensor | Engine switch on (IG) | 3.0 V*1 |
| D41-47 (HT1B) - D41-86 (E03) | R - BR | Heated oxygen sensor heater | Engine switch on (IG) | 11 to 14 V |
| Idling with warm engine | Below 3.0 V | |||
| D41-64 (OX1B) - D41-87 (EX1B) | W - Y | Heated oxygen sensor | Engine speed maintained at 2500 rpm for 2 minutes after warming up engine | Pulse generation (see waveform 2) |
| D41-108 (#10) - D41-45 (E01) D41-107 (#20) - D41-45 (E01) D41-106 (#30) - D41-45 (E01) D41-105 (#40) - D41-45 (E01) |
Y - BR R - BR G - BR L - BR |
Fuel injector | Engine switch on (IG) | 11 to 14 V |
| Idling with warm engine | Pulse generation (see waveform 3) | |||
| D41-110 (KNK1) - D41-111 (EKNK) | B - W | Knock control sensor | Engine speed maintained at 4000 rpm after warming up engine | Pulse generation (see waveform 4) |
| D41-99 (G2+) - D41-98 (G2-) | L - Y | Camshaft position sensor | Idling with warm engine | Pulse generation (see waveform 5) |
| D41-122 (NE+) - D41-121 (NE-) | R - G | Crankshaft position sensor | Idling with warm engine | Pulse generation (see waveform 5) |
| D41-85 (IGT1) - D41-104 (E1) D41-84 (IGT2) - D41-104 (E1) D41-83 (IGT3) - D41-104 (E1) D41-82 (IGT4) - D41-104 (E1) |
W - BR Y - BR G - BR G - BR |
Ignition coil (ignition signal) | Idling with warm engine | Pulse generation (see waveform 6) |
| D41-63 (GE01) - D41-104 (E1) | BR - BR | Shielded earth (ground) circuit of throttle drive motor | Always | Below 1 V |
| D41-81 (IGF1) - D41-104 (E1) | R - BR | Ignition coil (ignition confirmation signal) | Idling with warm engine | Pulse generation (see waveform 6) |
| D41-49 (PRG) - D41-104 (E1) | B - BR | Purge VSV | Engine switch on (IG) | 11 to 14 V |
| Idling with warm engine | Pulse generation (see waveform 7) | |||
| A8-8 (SPD) - D41-104 (E1) | BE - BR | Speed signal from combination meter | Driving at 20 km/h (12 mph) | Pulse generation (see waveform 8) |
| A8-48 (STA) - D41-104 (E1) | LG - BR | Starter signal | Cranking | 5.5 V or more |
| A8-14 (STSW) - D41-104 (E1) | V - BR | Starter relay operation signal | Engine switch pressed and held for about 1 second with the brake pedal depressed → engine switch released | 9 to 13 V → Below 1 V |
| D41-52 (STAR) - D41-104 (E1) | LG*2, G*3 - BR | Starter relay control | Engine switch on (IG), any shift position other than P or N | Below 1.5 V |
| Cranking | 5.5 V higher | |||
| A8-13 (ACCR) - D41-104 (E1) | GR - BR | ACC relay control signal | Cranking | Below 1.5 V |
| A8-36 (STP) - D41-104 (E1) | R - BR | Stop light switch | Brake pedal depressed | 7.5 to 14 V |
| Brake pedal released | Below 1.5 V | |||
| A8-35 (ST1-) - D41-104 (E1) | W - BR | Stop light switch (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 | |||
| D41-42 (M+) - D41-43 (ME01) | R - BR | Throttle actuator | Idling with warm engine | Pulse generation (see waveform 9) |
| D41-41 (M-) - D41-43 (ME01) | G - BR | Throttle actuator | Idling with warm engine | Pulse generation (see waveform 10) |
| A8-7 (FC) - D41-104 (E1) | L - BR | Fuel pump control | Engine switch on (IG) | 11 to 14 V |
| Idling with warm engine | Below 1.5 V | |||
| A8-24 (W) - D41-104 (E1) | G - BR | MIL | Engine coolant temperature sensor disconnected (MIL illuminated) | Below 1.5 V |
| Idling with warm engine (MIL not illuminated) | 11 to 14 V | |||
| A8-27 (TC) - D41-104 (E1) | R - BR | Terminal TC of DLC3 | Engine switch on (IG) | 11 to 14 V |
| A8-15 (TACH) - D41-104 (E1) | B - BR | Engine speed | Idling with warm engine | Pulse generation (see waveform 11) |
| A8-21 (FANL) - D41-104 (E1) | GR - BR | FAN No. 3 relay | Engine switch on (IG) | 11 to 14 V |
| Idling with A/C on, or high engine coolant temperature | Below 1.5 V | |||
| D41-69 (VCIB) - D41-92 (EIB) | P - BR | Battery current sensor | Idling with warm engine | 4.5 to 5.5 V |
| D41-68 (IB) - D41-92 (EIB) | W - BR | Battery current sensor | Engine switch on (IG), battery thermometer sensor surrounding temperature -30 to 90°C (-22 to 194°F) | 0.5 to 4.5 V |
| D41-120 (THB) - D41-92 (EIB) | B - BR | Battery current sensor | Engine switch on (IG) | 0.5 to 4.5 V |
| D41-104 (E1) - Body ground | BR - - | Earth (ground) circuit of ECM | Always | Below 1 Ω |
| D41-43 (ME01) - Body ground | BR - - | Earth (ground) circuit of ECM | Always | Below 1 Ω |
| D41-86 (E03) - Body ground | BR - - | Earth (ground) circuit of ECM | Always | Below 1 Ω |
| D41-45 (E01) - Body ground | BR - - | Earth (ground) circuit of ECM | Always | Below 1 Ω |
| D41-44 (E02) - Body ground | BR - - | Earth (ground) circuit of ECM | Always | Below 1 Ω |
| D41-46 (E04) - Body ground | BR - - | Earth (ground) circuit of ECM | Always | Below 1 Ω |
| A8-32 (EC) - Body ground | W-B - - | Earth (ground) circuit of ECM | Always | Below 1 Ω |
| A8-22 (FANH) - D41-104 (E1) | L - BR | FAN No. 1 and FAN No. 2 relay | Idling with high engine coolant temperature | Below 1.5 V |
| D41-50 (ALT) - D41-104 (E1) | B - BR | Generator | Engine switch on (IG) | 11 to 14 V |
| A8-41 (CANH) - D41-104 (E1) | B*2, L*3 - BR | CAN communication line | Engine stopped and engine switch on (IG) | Pulse generation (see waveform 12) |
| A8-49 (CANL) - D41-104 (E1) | W*2, Y*3 - BR | CAN communication line | Engine stopped and engine switch on (IG) | Pulse generation (see waveform 13) |
Tech Tips
*1: The ECM terminal voltage is constant regardless of the output voltage shown on the intelligent tester.
*2: for RHD
*3: for LHD
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WAVEFORM 1
Camshaft Timing Oil Control Valve ECM Terminal Name Between OC1+ and OC1- Tester Range 5 V/DIV., 1 ms./DIV. Condition Idling with warm engine -
WAVEFORM 2
Heated Oxygen Sensor (Sensor 2) ECM Terminal Name Between OX1B and EX1B 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 Data List, item O2S B1S2 shows the ECM input values from the heated oxygen sensor.
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WAVEFORM 3
Fuel Injector No. 1 (to No. 4) Injection Signal ECM Terminal Name Between #10 (to #40) 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 4
Knock Control Sensor ECM Terminal Name Between KNK1 and EKNK 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.
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WAVEFORM 5
Crankshaft Position Sensor and Camshaft Position Sensor ECM Terminal Name CH1: Between G2+ and G2-
CH2: 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 6
Igniter IGT Signal (from ECM to igniter) and Igniter IGF Signal (from igniter to ECM) ECM Terminal Name (1) Between IGT (1 to 4) and E1
(2) 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 7
Purge VSV ECM Terminal Name Between PRG and E1 Tester Range 10 V/DIV., 20 ms./DIV. Condition Idling with warm engine 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 8
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.
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WAVEFORM 9
Throttle Actuator Positive Terminal 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 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
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 12
CAN Communication Signal (Reference) ECM Terminal Name Between CANH and E1 Tester Range 1 V/DIV., 10 μsec./DIV. Condition Engine stopped and engine switch on (IG) Tech Tips
The waveform varies depending on the CAN communication signal.
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WAVEFORM 13
CAN Communication Signal (Reference) ECM Terminal Name Between CANL and E1 Tester Range 1 V/DIV., 10 μsec./DIV. Condition Engine stopped and engine switch on (IG) Tech Tips
The waveform varies depending on the CAN communication signal.