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 |
|---|---|---|---|---|
| A31-1 (BATT) - C31-59 (E1) | B - W-B | Auxiliary battery (for measuring auxiliary battery voltage and for ECM memory) | Power switch off | 11 to 16 V |
| A31-2 (+B) - C31-59 (E1) | R - W-B | Power source of ECM | Engine stopped, power switch on (IG) | 11 to 14 V |
| A31-3 (+B2) - C31-59 (E1) | R - W-B | Power source of ECM | Engine stopped, power switch on (IG) | 11 to 14 V |
| A31-6 (IGSW) - C31-59 (E1) | BE - W-B | Power switch signal | Engine stopped, power switch on (IG) | 11 to 14 V |
| A31-13 (CANH) - C31-59 (E1) | R - W-B | CAN communication line | Engine stopped, power switch on (IG) | Pulse generation (See waveform 1) |
| A31-26 (CANL) - C31-59 (E1) | W - W-B | CAN communication line | Engine stopped, power switch on (IG) | Pulse generation (See waveform 2) |
| A31-30 (NEO) - C31-59 (E1) | L - W-B | Crankshaft revolution signal | Idling with warm engine | Pulse generation (See waveform 3) |
| A31-31 (TACH) - C31-59 (E1) | V - W-B | Engine speed signal | Idling with warm engine | Pulse generation (See waveform 4) |
| A31-32 (EC) - Body ground | W-B - - | Ground | Always | Below 1 Ω |
| A31-41 (FC) - C31-59 (E1) | SB - W-B | Fuel pump control | Engine stopped, power switch on (IG) | 11 to 14 V |
| Idling | Below 1.5 V | |||
| A31-42 (FUEL) - C31-59 (E1) | P - W-B | Fuel lid opener switch signal | Fuel lid opener switch pressed | Below 1.0 V |
| Fuel lid opener switch not pressed | 4.5 to 5.5 V | |||
| A31-46 (MREL) - C31-59 (E1) | G - W-B | EFI-MAIN relay operation signal | Engine stopped, power switch on (IG) | 11 to 14 V |
| A31-59 (FREL) - C31-59 (E1) | LG - W-B | Fuel lid lock with motor assembly operation signal | Fuel lid lock with motor assembly operating | Below 1.0 V |
| Fuel lid lock with motor assembly not operating | 11 to 14 V | |||
| A31-60 (RFC) - C31-59 (E1) | B - W-B | Cooling fan signal | Power switch on (IG), Active Test "Control the Engine Cooling Fan Duty Ratio" is 30% | Pulse generation (See waveform 5) |
| C31-26 (E04) - Body ground | W-B - - | Ground | Always | Below 1 Ω |
| C31-27 (HA1A) - C31-26 (E04) | R - W-B | Air fuel ratio sensor heater operation signal | Engine stopped, power switch on (IG) | 11 to 14 V |
| Idling with cold engine | Pulse generation (See waveform 6) |
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| C31-28 (ME01) - Body ground | W-B - - | Ground | Always | Below 1 Ω |
| C31-29 (+BM) - C31-59 (E1) | R - W-B | Power source of throttle actuator | Power switch off | 11 to 16 V |
| C31-30 (M-) - C31-28 (ME01) | P - W-B | Throttle actuator operation signal (negative signal) | Idling with warm engine | Pulse generation (See waveform 7) |
| C31-31 (CAN+) - C31-59 (E1) | SB - W-B | CAN communication line | Engine stopped, power switch on (IG) | Pulse generation (See waveform 1) |
| C31-32 (CAN-) - C31-59 (E1) | W - W-B | CAN communication line | Engine stopped, power switch on (IG) | Pulse generation (See waveform 2) |
| C31-33 (PRG) - C31-59 (E1) | V - 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 8) |
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| C31-35 (OC1+) - C31-34 (OC1-) | L - G | Camshaft timing oil control valve assembly operation signal | Idling | Pulse generation (See waveform 9) |
| C31-56 (HT1B) - C31-26 (E04) | G - W-B | Heated oxygen sensor heater operation signal | Engine stopped, power switch on (IG) | 11 to 14 V |
| Idling with cold engine | Below 3.0 V | |||
| C31-57 (E01) - Body ground | W-B - - | Ground | Always | Below 1 Ω |
| C31-58 (E02) - Body ground | W-B - - | Ground | Always | Below 1 Ω |
| C31-59 (E1) - Body ground | W-B - - | Ground | Always | Below 1 Ω |
| C31-60 (M+) - C31-28 (ME01) | V - W-B | Throttle actuator operation signal (positive terminal) | Idling with warm engine | Pulse generation (See waveform 10) |
| C31-62 (WSV) - C31-59 (E1) | G - W-B | Flow shutting valve (water valve) operation signal | Engine stopped, power switch on (IG) | 11 to 14 V |
| C31-68 (WPI) - C31-59 (E1) | P - W-B | Engine water pump assembly signal | Idling with warm engine | Pulse generation (See waveform 11) |
| C31-69 (WPO) - C31-59 (E1) | L - W-B | Engine water pump assembly signal | Idling with warm engine | Pulse generation (See waveform 12) |
| C31-70 (G2O) - C31-59 (E1) | W - W-B | Camshaft revolution signal | Idling with warm engine | Pulse generation (See waveform 13) |
| C31-71 (IGF1) - C31-59 (E1) | L - 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 14) |
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| C31-72 (IGT4) - C31-59 (E1) | V - W-B | No. 4 ignition coil assembly signal (ignition signal) |
Idling with warm engine | Pulse generation (See waveform 14) |
| C31-73 (IGT3) - C31-59 (E1) | G - W-B | No. 3 ignition coil assembly signal (ignition signal) |
Idling with warm engine | Pulse generation (See waveform 14) |
| C31-74 (IGT2) - C31-59 (E1) | B - W-B | No. 2 ignition coil assembly signal (ignition signal) |
Idling with warm engine | Pulse generation (See waveform 14) |
| C31-75 (IGT1) - C31-59 (E1) | GR - W-B | No. 1 ignition coil assembly signal (ignition signal) |
Idling with warm engine | Pulse generation (See waveform 14) |
| C31-77 (VCPM) - C31-76 (EPIM) | GR - V | Power source of manifold absolute pressure sensor | Engine stopped, power switch on (IG) | 4.75 to 5.25 V |
| C31-78 (PIM) - C31-76 (EPIM) | B - V | Manifold absolute pressure sensor signal | Engine stopped, power switch on (IG) | 3.0 to 4.5 V |
| C31-82 (VV1+) - C31-115 (VV1-) | SB - W | Camshaft position sensor signal | Idling with warm engine | Pulse generation (See waveform 15) |
| C31-95 (#20) - C31-57 (E01) | LG - W-B | No. 2 fuel injector assembly signal | Idling with warm engine | Pulse generation (See waveform 16) |
| C31-96 (#30) - C31-57 (E01) | L - W-B | No. 3 fuel injector assembly signal | Idling with warm engine | Pulse generation (See waveform 16) |
| C31-97 (#40) - C31-57 (E01) | R - W-B | No. 4 fuel injector assembly signal | Idling with warm engine | Pulse generation (See waveform 16) |
| C31-98 (#10) - C31-57 (E01) | BE - W-B | No. 1 fuel injector assembly signal | Idling with warm engine | Pulse generation (See waveform 16) |
| C31-99 (OX1B) - C31-131 (EX1B) | V - P | Heated oxygen sensor signal | Engine speed maintained at 2500 rpm for 2 minutes after warming up engine | Pulse generation (See waveform 17) |
| C31-100 (A1A+) - C31-59 (E1) | Y - W-B | Air fuel ratio sensor signal | Engine stopped, power switch on (IG) | 3.0 to 3.6 V |
| C31-101 (VTA2) - C31-133 (ETA) | B - G | Throttle position sensor signal (for sensor malfunction detection) | Engine stopped, power switch on (IG), accelerator pedal fully released | 2.1 to 3.1 V |
| C31-105 (EGR4) - C31-59 (E1) | LG - W-B | EGR valve assembly signal | EGR valve assembly operating | Pulse generation (See waveform 18) |
| C31-106 (EGR2) - C31-59 (E1) | R - W-B | EGR valve assembly signal | EGR valve assembly operating | Pulse generation (See waveform 18) |
| C31-107 (EGR3) - C31-59 (E1) | BE - W-B | EGR valve assembly signal | EGR valve assembly operating | Pulse generation (See waveform 18) |
| C31-108 (GE01) - Body ground | L - - | Shielded (ground) circuit of throttle actuator | Always | Below 1 Ω |
| C31-114 (NE+) - C31-113 (NE-) | B - W | Crankshaft position sensor signal | Idling with warm engine | Pulse generation (See waveform 19) |
| C31-116 (VCV1) - C31-59 (E1) | R - W-B | Power source of camshaft position sensor | Engine stopped, power switch on (IG) | 4.5 to 5.5 V |
| C31-120 (THW) - C31-119 (ETHW) | L - BR | Engine coolant temperature sensor signal | Idling, engine coolant temperature 75 to 100°C (167 to 212°F) | 0.2 to 1.0 V |
| C31-122 (KNK1) - C31-121 (EKNK) | B - W | Knock control sensor signal | Engine speed maintained at 2500 rpm after warming up engine | Pulse generation (See waveform 20) |
| C31-129 (THHW) - C31-130 (ETHH) | P - BR | No. 2 engine coolant temperature sensor signal | Idling, engine coolant temperature 75 to 100°C (167 to 212°F) | 0.2 to 1.0 V |
| C31-132 (A1A-) - C31-59 (E1) | BR - W-B | Air fuel ratio sensor signal | Engine stopped, power switch on (IG) | 2.7 to 3.3 V |
| C31-134 (VCTA) - C31-133 (ETA) | R - G | Power source of throttle position sensor (specific voltage) | Engine stopped, power switch on (IG) | 4.5 to 5.5 V |
| C31-135 (VTA1) - C31-133 (ETA) | BE - G | Throttle position sensor signal (for engine control) | Engine stopped, power switch on (IG), accelerator pedal fully released | 0.6 to 1.1 V |
| C31-137 (VG) - C31-104 (E2G) | G - L | Mass air flow meter sub-assembly signal | Idling, park (P) or neutral (N) selected, A/C switch off | 0.5 to 3.0 V |
| C31-138 (THA) - C31-139 (ETHA) | V - GR | 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 |
| C31-140 (EGR1) - C31-59 (E1) | P - W-B | EGR valve assembly signal | EGR valve assembly operating | Pulse generation (See waveform 18) |
*: 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 CANH and E1
Between CAN+ 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 CANL and E1
Between CAN- 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 1 V/DIV. *b 1 ms./DIV. Cooling Fan Control Signal ECM Terminal Name Between RFC and E1 Tester Range 1 V/DIV., 1 ms./DIV. Condition Power switch on (IG), Active Test "Control the Engine Cooling Fan Duty" is 30% -
WAVEFORM 6
*a 5 V/DIV. *b 10 ms./DIV. Air Fuel Ratio Sensor Heater Operation Signal ECM Terminal Name Between HA1A and E04 Tester Range 5 V/DIV., 10 ms./DIV. Condition Idling with cold engine -
WAVEFORM 7
*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 8
*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 9
*a 5 V/DIV. *b 1 ms./DIV. Camshaft Timing Oil Control Valve Assembly Operation Signal ECM Terminal Name Between OC1+ and OC1- Tester Range 5 V/DIV., 1 ms./DIV. Condition Idling -
WAVEFORM 10
*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 11
*a 5 V/DIV. *b 20 ms./DIV. Engine Water Pump Assembly Signal (from Engine Water Pump Assembly to ECM) ECM Terminal Name Between WPI and E1 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.
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WAVEFORM 12
*a 5 V/DIV. *b 20 ms./DIV. Engine Water Pump Assembly Signal (from ECM to Engine Water Pump Assembly) ECM Terminal Name Between WPO and E1 Tester Range 5 V/DIV., 20 ms./DIV. Condition Idling with warm engine Tech Tips
The duty ratio varies depending on the engine water pump assembly speed.
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WAVEFORM 13
*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 Tech Tips
The wavelength becomes shorter as the engine speed increases.
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WAVEFORM 14
*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 15
*a 5 V/DIV. *b 20 ms./DIV. Camshaft Position Sensor Signal ECM Terminal Name Between VV1+ and VV1- 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 16
*1 20 V/DIV. *2 20 ms./DIV. No. 1 (to No. 4) Fuel Injector Assembly 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 17
*1 0.2 V/DIV. *2 200 ms./DIV. Heated Oxygen Sensor Signal 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
Data List item "O2 Sensor Voltage B1S2" shows the ECM values from the heated oxygen sensor.
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WAVEFORM 18
*1 20 V/DIV. *2 50 ms./DIV. EGR Valve Assembly Signal ECM Terminal Name Between EGR1 ( to EGR4) and E1 Tester Range 20 V/DIV., 50 ms./DIV. Condition EGR valve assembly operating -
WAVEFORM 19
*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 20
*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 will differ slightly depending on the vehicle.
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