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SFI SYSTEM TERMINALS OF ECM

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Measure the voltage according to the value(s) in the table below.

Tip:

The standard voltage between each pair of ECM terminals is shown in the table below. The appropriate conditions for checking each pair of terminals are also indicated. The result of checks should be compared with the standard voltage for that pair of terminals, which is 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

A38*1-1 (BATT) - C45*1-81 (E1)

A52*2-1 (BATT) - C46*2-81 (E1)

 L - BR Battery (for measuring the battery voltage and for the ECM memory) Always 11 to 14 V

C45*1-41 (+BM) - C45*1-81 (E1)

C46*2-41 (+BM) - C46*2-81 (E1)

 P - BR Power source of throttle motor Always 11 to 14 V

A38*1-28 (IGSW) - C45*1-81 (E1)

A52*2-28 (IGSW) - C46*2-81 (E1)

 B - BR Ignition switch Ignition switch ON 11 to 14 V

A38*1-3 (+B) - C45*1-81 (E1)

A52*2-3 (+B) - C46*2-81 (E1)

 B - BR Power source of ECM Ignition switch ON 11 to 14 V

A38*1-2 (+B2) - C45*1-81 (E1)

A52*2-2 (+B2) - C46*2-81 (E1)

 B - BR Power source of ECM Ignition switch ON 11 to 14 V

C45*1-58 (OC1+) - C45*1-57 (OC1-)

C46*2-58 (OC1+) - C46*2-57 (OC1-)

 L-B - R-B Camshaft timing oil control valve (for intake side of bank 1) Ignition switch ON

Pulse generation

(See waveform 1)

C45*1-52 (OC2+) - C45*1-51 (OC2-)

C46*2-52 (OC2+) - C46*2-51 (OC2-)

 B - B-L Camshaft timing oil control valve (for intake side bank 2) Ignition switch ON

Pulse generation

(See waveform 1)

C45*1-56 (OE1+) - C45*1-55 (OE1-)

C46*2-56 (OE1+) - C46*2-55 (OE1-)

 G-W - B-R Camshaft timing oil control valve (for exhaust side of bank 1) Ignition switch ON

Pulse generation

(See waveform 1)

C45*1-50 (OE2+) - C45*1-49 (OE2-)

C46*2-50 (OE2+) - C46*2-49 (OE2-)

 R-W - L-W Camshaft timing oil control valve (for exhaust side of bank 2) Ignition switch ON

Pulse generation

(See waveform 1)

A38*1-34 (MREL) - C45*1-81 (E1)

A52*2-34 (MREL) - C46*2-81 (E1)

 W-R - BR EFI relay Ignition switch ON 11 to 14 V

C45*1-67 (VCV1) - C45*1-97 (ETHW)

C46*2-67 (VCV1) - C46*2-97 (ETHW)

 L - BR Power source of sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V

C45*1-66 (VCV2) - C45*1-98 (ETHA)

C46*2-66 (VCV2) - C46*2-98 (ETHA)

 L - BR Power source of sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V

C45*1-74 (VG) - C45*1-75 (E2G)

C46*2-74 (VG) - C46*2-75 (E2G)

 L-Y - G-W Mass air flow meter Idling, shift lever position P or N, A/C switch off 0.5 to 3.0 V

C45*1-73 (THA) - C45*1-98 (ETHA)

C46*2-73 (THA) - C46*2-98 (ETHA)

 Y-B - BR Intake air temperature sensor Idling, intake air temperature 20°C (68°F) 0.5 to 3.4 V

C45*1-76 (THW) - C45*1-97 (ETHW)

C46*2-76 (THW) - C46*2-97 (ETHW)

 G-B - BR Engine coolant temperature sensor Idling, engine coolant temperature 80°C (176°F) 0.2 to 1.0 V

C45*1-80 (VCTA) - C45*1-79 (ETA)

C46*2-80 (VCTA) - C46*2-79 (ETA)

 L - B Power source of throttle position sensor (specific voltage) Ignition switch ON 4.5 to 5.5 V

C45*1-78 (VTA1) - C45*1-79 (ETA)

C46*2-78 (VTA1) - C46*2-79 (ETA)

 R-Y - B Throttle position sensor (for engine control) Ignition switch ON, throttle valve fully closed 0.5 to 1.2 V
Ignition switch ON, throttle valve fully open 3.2 to 4.8 V

C45*1-77 (VTA2) - C45*1-79 (ETA)

C46*2-77 (VTA2) - C46*2-79 (ETA)

 Y-B - B Throttle position sensor (for sensor malfunction detection) Ignition switch ON, throttle valve fully closed 2.1 to 3.1 V
Ignition switch ON, throttle valve fully open 4.5 to 5.0 V

A38*1-55 (VPA) - A38*1-58 (EPA)

A52*2-55 (VPA) - A52*2-58 (EPA)

R - W

R - W-L*4

 Accelerator pedal position sensor (for engine control) Ignition switch ON, accelerator pedal fully released 0.5 to 1.1 V
Ignition switch ON, accelerator pedal fully depressed 2.6 to 4.5 V

A38*1-56 (VPA2) - A38*1-60 (EPA2)

A52*2-56 (VPA2) - A52*2-60 (EPA2)

GR - BE

GR-G - BR*4

 Accelerator pedal position sensor (for sensor malfunction detection) Ignition switch ON, accelerator pedal fully released 1.2 to 2.0 V
Ignition switch ON, accelerator pedal fully depressed 3.4 to 5.0 V

A38*1-57 (VCPA) - A38*1-58 (EPA)

A52*2-57 (VCPA) - A52*2-58 (EPA)

L - W

L-W - W-L*4

 Power source of accelerator pedal position sensor (for VPA) Ignition switch ON 4.5 to 5.5 V

A38*1-59 (VCP2) - A38*1-60 (EPA2)

A52*2-59 (VCP2) - A52*2-60 (EPA2)

V - BE

V - BR*4

 Power source of accelerator pedal position sensor (for VPA2) Ignition switch ON 4.5 to 5.5 V

C45*1-22 (HA1A) - C45*1-23 (E04)

C46*2-22 (HA1A) - C46*2-23 (E04)

 L-R - W-B Air fuel ratio sensor heater Idling with warm engine

Pulse generation

(See waveform 16)
Ignition switch ON 11 to 14 V

C45*1-20 (HA2A) - C45*1-21 (E05)

C46*2-20 (HA2A) - C46*2-21 (E05)

 G - W-B Air fuel ratio sensor heater Idling with warm engine

Pulse generation

(See waveform 16)
Ignition switch ON 11 to 14 V

C45*1-126 (A1A+) - C45*1-81 (E1)

C46*2-126 (A1A+) - C46*2-81 (E1)

 G - BR Air fuel ratio sensor Ignition switch ON 3.3 V*3

C45*1-103 (A2A+) - C45*1-81 (E1)

C46*2-103 (A2A+) - C46*2-81 (E1)

 V - BR Air fuel ratio sensor Ignition switch ON 3.3 V*3

C45*1-125 (A1A-) - C45*1-81 (E1)

C46*2-125 (A1A-) - C46*2-81 (E1)

 R - BR Air fuel ratio sensor Ignition switch ON 2.9 V*3

C45*1-102 (A2A-) - C45*1-81 (E1)

C46*2-102 (A2A-) - C46*2-81 (E1)

 P - BR Air fuel ratio sensor Ignition switch ON 2.9 V*3

C45*1-45 (HT1B) - C45*1-46 (E03)

C46*2-45 (HT1B) - C46*2-46 (E03)

 G - W-B Heated oxygen sensor heater Idling Below 3.0 V
Ignition switch ON 11 to 14 V

C45*1-44 (HT2B) - C45*1-46 (E03)

C46*2-44 (HT2B) - C46*2-46 (E03)

 B - W-B Heated oxygen sensor heater Idling Below 3.0 V
Ignition switch ON 11 to 14 V

C45*1-114 (OX1B) - C45*1-115 (EX1B)

C46*2-114 (OX1B) - C46*2-115 (EX1B)

 W - B-R Heated oxygen sensor Engine speed maintained at 2500 rpm for 2 minutes after warming up engine

Pulse generation

(See waveform 2)

C45*1-112 (OX2B) - C45*1-113 (EX2B)

C46*2-112 (OX2B) - C46*2-113 (EX2B)

 B - BR Heated oxygen sensor Engine speed maintained at 2500 rpm for 2 minutes after warming up engine

Pulse generation

(See waveform 2)

C45*1-86 (#10) - C45*1-43 (E01)

C46*2-86 (#10) - C46*2-43 (E01)

 R-L - W-B Fuel injector Ignition switch ON 11 to 14 V
Idling

Pulse generation

(See waveform 3)

C45*1-109 (#20) - C45*1-43 (E01)

C46*2-109 (#20) - C46*2-43 (E01)

 L - W-B Fuel injector Ignition switch ON 11 to 14 V
Idling

Pulse generation

(See waveform 3)

C45*1-85 (#30) - C45*1-43 (E01)

C46*2-85 (#30) - C46*2-43 (E01)

 R-B - W-B Fuel injector Ignition switch ON 11 to 14 V
Idling

Pulse generation

(See waveform 3)

C45*1-108 (#40) - C45*1-43 (E01)

C46*2-108 (#40) - C46*2-43 (E01)

 Y - W-B Fuel injector Ignition switch ON 11 to 14 V
Idling

Pulse generation

(See waveform 3)

C45*1-84 (#50) - C45*1-43 (E01)

C46*2-84 (#50) - C46*2-43 (E01)

 G - W-B Fuel injector Ignition switch ON 11 to 14 V
Idling

Pulse generation

(See waveform 3)

C45*1-107 (#60) - C45*1-43 (E01)

C46*2-107 (#60) - C46*2-43 (E01)

 R - W-B Fuel injector Ignition switch ON 11 to 14 V
Idling

Pulse generation

(See waveform 3)

C45*1-94 (KNK1) - C45*1-93 (EKNK)

C46*2-94 (KNK1) - C46*2-93 (EKNK)

 G - R Knock sensor (bank 1) Engine speed maintained at 4000 rpm after warming up engine

Pulse generation

(See waveform 4)

C45*1-117 (KNK2) - C45*1-116 (EKN2)

C46*2-117 (KNK2) - C46*2-116 (EKN2)

 W - B Knock sensor (bank 2) Engine speed maintained at 4000 rpm after warming up engine

Pulse generation

(See waveform 4)

C45*1-90 (VV1+) - C45*1-89 (VV1-)

C46*2-90 (VV1+) - C46*2-89 (VV1-)

 R - L-R VVT sensor (intake side of bank 1) Idling

Pulse generation

(See waveform 5)

C45*1-87 (VV2+) - C45*1-88 (VV2-)

C46*2-87 (VV2+) - C46*2-88 (VV2-)

 R - G VVT sensor (intake side of bank 2) Idling

Pulse generation

(See waveform 5)

C45*1-69 (EV1+) - C45*1-68 (EV1-)

C46*2-69 (EV1+) - C46*2-68 (EV1-)

 L-B - L-W VVT sensor (exhaust side of bank 1) Idling

Pulse generation

(See waveform 15)

C45*1-64 (EV2+) - C45*1-65 (EV2-)

C46*2-64 (EV2+) - C46*2-65 (EV2-)

 G-W - R-W VVT sensor (exhaust side of bank 2) Idling

Pulse generation

(See waveform 15)

C45*1-110 (NE+) - C45*1-111 (NE-)

C46*2-110 (NE+) - C46*2-111 (NE-)

 B - W Crankshaft position sensor Idling

Pulse generation

(See waveform 5)

C45*1-40 (IGT1) - C45*1-81 (E1)

C46*2-40 (IGT1) - C46*2-81 (E1)

 B-R - BR

Ignition coil

(ignition signal)

 Idling

Pulse generation

(See waveform 6)

C45*1-39 (IGT2) - C45*1-81 (E1)

C46*2-39 (IGT2) - C46*2-81 (E1)

 L-B - BR

Ignition coil

(ignition signal)

 Idling

Pulse generation

(See waveform 6)

C45*1-38 (IGT3) - C45*1-81 (E1)

C46*2-38 (IGT3) - C46*2-81 (E1)

 B - BR

Ignition coil

(ignition signal)

 Idling

Pulse generation

(See waveform 6)

C45*1-37 (IGT4) - C45*1-81 (E1)

C46*2-37 (IGT4) - C46*2-81 (E1)

 L-B - BR

Ignition coil

(ignition signal)

 Idling

Pulse generation

(See waveform 6)

C45*1-36 (IGT5) - C45*1-81 (E1)

C46*2-36 (IGT5) - C46*2-81 (E1)

 G-R - BR

Ignition coil

(ignition signal)

 Idling

Pulse generation

(See waveform 6)

C45*1-35 (IGT6) - C45*1-81 (E1)

C46*2-35 (IGT6) - C46*2-81 (E1)

 G - BR

Ignition coil

(ignition signal)

 Idling

Pulse generation

(See waveform 6)

C45*1-104 (IGF1) - C45*1-81 (E1)

C46*2-104 (IGF1) - C46*2-81 (E1)

 G-B - BR

Ignition coil

(ignition confirmation signal)

 Ignition switch ON 4.5 to 5.5 V
Idling

Pulse generation

(See waveform 6)

C45*1-63 (PRG) - C45*1-81 (E1)

C46*2-63 (PRG) - C46*2-81 (E1)

 L-B - BR Purge VSV Ignition switch ON 11 to 14 V
Idling

Pulse generation

(See waveform 7)

A38*1-13 (SPD) - C45*1-81 (E1)

A52*2-13 (SPD) - C46*2-81 (E1)

V -BR

V-R - BR*4

 Speed signal from combination meter Ignition switch ON, driving wheels rotated slowly

Pulse generation

(See waveform 8)

A38*1-46 (STA) - C45*1-81 (E1)

A52*2-46 (STA) - C46*2-81 (E1)

R - BR

R-B - BR*4

 Starter signal Cranking 6.0 V or higher

A38*1-36 (STP) - C45*1-81 (E1)

A52*2-36 (STP) - C46*2-81 (E1)

 R - BR Stop light switch Brake pedal depressed 7.5 to 14 V
Brake pedal released Below 1.5 V

A38*1-35 (ST1-) - C45*1-81 (E1)

A52*2-35 (ST1-) - C46*2-81 (E1)

P - BR

R-W - BR*4

 Stop light switch (opposite to STP terminal) Ignition switch ON, brake pedal depressed Below 1.5 V
Ignition switch ON, brake pedal released 7.5 to 14 V

C45*1-120 (NSW) - C45*1-81 (E1)

C46*2-120 (NSW) - C46*2-81 (E1)

 L - BR Park/neutral position switch Ignition switch ON, shift lever in P or N Below 3.0 V
Ignition switch ON, shift lever not in P or N 11 to 14 V

C45*1-19 (M+) - C45*1-82 (ME01)

C46*2-19 (M+) - C46*2-82 (ME01)

 R - W-B Throttle actuator Idling with warm engine

Pulse generation

(See waveform 9)

C45*1-18 (M-) - C45*1-82 (ME01)

C46*2-18 (M-) - C46*2-82 (ME01)

 G - W-B Throttle actuator Idling with warm engine

Pulse generation

(See waveform 10)

A38*1-24 (W) - C45*1-81 (E1)

A52*2-24 (W) - C46*2-81 (E1)

R - BR

R-Y - BR*4

 MIL Ignition switch ON Below 3.0 V
Idling 11 to 14 V

A38*1-16 (TC) - C45*1-81 (E1)

A52*2-16 (TC) - C46*2-81 (E1)

V - BR

V-W - BR*4

 Terminal TC of DLC3 Ignition switch ON 11 to 14 V

A38*1-15 (TACH) - C45*1-81 (E1)

A52*2-15 (TACH) - C46*2-81 (E1)

W - BR

W-G - BR*4

 Engine speed Idling

Pulse generation

(See waveform 11)

C45*1-72 (PSP) - C45*1-97 (ETHW)

C46*2-72 (PSP) - C46*2-97 (ETHW)

 L-R - BR Power steering oil pressure sensor Ignition switch ON 0.33 to 3.60 V
C45*1-28 (AIRV) - C45*1-81 (E1) BR - BR Emission control valve signal for secondary air injection system Ignition switch ON 11 to 14 V
C45*1-54 (AIRP) - C45*1-81 (E1) P - BR Air pump control signal for secondary air injection system Ignition switch ON 11 to 14 V
C45*1-30 (AIDI) - C45*1-81 (E1) G - BR Diagnostic information signal for secondary air injection system Air injection system operating

Pulse generation

(See waveform 14)
C45*1-60 (AIR1) - C45*1-81 (E1) G-W - BR No. 2 emission control valve for secondary air injection system Idling 11 to 14 V
A38*1-54 (AIP) - C45*1-98 (ETHA) P-L - BR Secondary air injection system pressure signal Ignition switch ON 0.5 to 4.5 V
A38*1-53 (AIP2) - C45*1-98 (ETHA) L-B - BR Secondary air injection system pressure signal Ignition switch ON 0.5 to 4.5 V
C45*1-61 (HAI1) - C45*1-81 (E1) G - BR Air pump heater for secondary air injection system Air pump heater operating 11 to 14 V

A38*1-10 (CANH) - C45*1-81 (E1)

A52*2-10 (CANH) - C46*2-81 (E1)

 P - BR CAN communication line Ignition switch ON

Pulse generation

(See waveform 12)

A38*1-11 (CANL) - C45*1-81 (E1)

A52*2-11 (CANL) - C46*2-81 (E1)

 B - BR CAN communication line Ignition switch ON

Pulse generation

(See waveform 13)

A38*1-52 (FPC) - C45*1-81 (E1)

A52*2-52 (FPC) - C46*2-81 (E1)

 W - BR Fuel pump control Engine stopped and ignition switch ON Below 1.5 V

A38*1-14 (STSW) - C45*1-81 (E1)

A52*2-14 (STSW) - C46*2-81 (E1)

 R - BR Ignition switch signal Shift lever in P or N, ignition switch START 6.0 V or higher

A38*1-41 (ACCR) - C45*1-81 (E1)

A52*2-41 (ACCR) - C46*2-81 (E1)

 L-Y - BR ACC (accessory) relay control signal Cranking Below 1.5 V

C45*1-16 (STAR) - C45*1-81 (E1)

C46*2-16 (STAR) - C46*2-81 (E1)

 L - BR Starter relay control Ignition switch ON Below 1.5 V
Cranking 6.0 V or higher

C45*1-32 (ALT) - C45*1-81 (E1)

C46*2-32 (ALT) - C46*2-81 (E1)

 R - BR Generator Ignition switch ON 11 to 14 V



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    Table 1. *a 5 V/DIV. *b Ground *c 1 msec./DIV. WAVEFORM 1 Table 2. Camshaft Timing Oil Control Valve ECM Terminal Name Between OC1+ and OC1- Between OC2+ and OC2- Between OE1+ and OE1- Between OE2+ and OE2- Tester Range 5 V/DIV., 1 msec./DIV. Condition Idling Table 3. *1 0.2 V/DIV. *2 Ground *3 200 msec./DIV. WAVEFORM 2 Table 4. Heated Oxygen Sensor ECM Terminal Name Between OX1B and EX1B or OX2B and EX2B Tester Range 0.2 V/DIV., 200 msec./DIV. Condition Engine speed maintained at 2500 rpm for 2 minutes after warming up engine Tip: In the Data List, items O2S B1S2 and O2S B2S2 show the ECM input values from the heated oxygen sensors. Table 5. *1 30 V/DIV. *2 Ground *3 20 msec./DIV. WAVEFORM 3 Table 6. Fuel Injector ECM Terminal Name Between #10 (to #60) and E01 Tester Range 30 V/DIV., 20 msec./DIV. Condition Idling Tip: The wavelength becomes shorter as the engine speed increases. Table 7. *a KNK1 Signal Waveform *b 1 V/DIV. *c Ground *d 1 msec./DIV. WAVEFORM 4 Table 8. Knock Sensor ECM Terminal Name Between KNK1 and EKNK or KNK2 and EKN2 Tester Range 1 V/DIV., 0.01 to 1 msec./DIV. Condition Engine speed maintained at 4000 rpm after warming up engine Tip: The wavelength becomes shorter as the engine speed increases. The waveforms and amplitudes displayed differ slightly depending on the vehicle condition. WAVEFORM 5 Crankshaft position sensor VVT sensor ECM Terminal Name (a) Between NE+ and NE- (b) Between VV1+ and VV1- or VV2+ and VV2- Tester Range 2 V/DIV., 20 msec./DIV. Condition Idling Tip: The wavelength becomes shorter as the engine speed increases. WAVEFORM 6 Igniter IGT signal (from ECM to igniter) Igniter IGF signal (from igniter to ECM) ECM Terminal Name (a) Between IGT (1 to 6) and E1 (b) Between IGF1 and E1 Tester Ranges 2 V/DIV., 20 msec./DIV. Condition Idling Tip: The wavelength becomes shorter as the engine speed increases. Table 9. *1 10 V/DIV. *2 20 msec./DIV. WAVEFORM 7 Table 10. Purge VSV ECM Terminal Name Between PRG and E1 Tester Range 10 V/DIV., 20 msec./DIV. Condition Idling Tip: If the waveform is not similar to the illustration, check the waveform again after idling for 10 minutes or more. Table 11. *a 2 V/DIV. *b Ground *c 20 msec./DIV. WAVEFORM 8 Table 12. Vehicle Speed Signal ECM Terminal Name Between SPD and E1 Tester Range 2 V/DIV., 20 msec./DIV. Condition Ignition switch ON, driving wheels rotated slowly Tip: The wavelength becomes shorter as the vehicle speed increases. Table 13. *a 5 V/DIV. *b 1 msec./DIV. WAVEFORM 9 Table 14. Positive Terminal of Throttle Actuator ECM Terminal Name Between M+ and ME01 Tester Range 5 V/DIV., 1 msec./DIV. Condition Idling with warm engine Tip: The duty ratio varies depending on the throttle actuator operation. Table 15. *a 5 V/DIV. *b 1 msec./DIV. WAVEFORM 10 Table 16. Negative Terminal of Throttle Actuator ECM Terminal Name Between M- and ME01 Tester Range 5 V/DIV., 1 msec./DIV. Condition Idling with warm engine Tip: The duty ratio varies depending on the throttle actuator operation. Table 17. *a 5 V/DIV. *b Ground *c 10 msec./DIV. WAVEFORM 11 Table 18. Engine Speed Signal ECM Terminal Name Between TACH and E1 Tester Range 5 V/DIV., 10 msec./DIV. Condition Idling Tip: The wavelength becomes shorter as the engine speed increases. Table 19. *a 1 V/DIV. *b 10 μsec./DIV. WAVEFORM 12 Table 20. CAN Communication Signal (Reference) ECM Terminal Name Between CANH and E1 Tester Range 1 V/DIV., 10 μsec./DIV. Condition Ignition switch ON Tip: The waveform varies depending on the CAN communication signal. Table 21. *a 1 V/DIV. *b 10 μsec./DIV. WAVEFORM 13 Table 22. CAN Communication Signal (Reference) ECM Terminal Name Between CANL and E1 Tester Range 1 V/DIV., 10 μsec./DIV. Condition Ignition switch ON Tip: The waveform varies depending on the CAN communication signal. Table 23. *a 5 V/DIV. *b 50 msec./DIV. WAVEFORM 14 Table 24. Terminal AID of Air Injection Control Driver ECM Terminal Name Between AIDI and E1 Tester Range 5 V/DIV., 50 msec./DIV. Condition Performing Active Test using GTS (Secondary Air Injection Check) Tip: The wavelength changes when the air injection control driver detects malfunctions in the secondary air injection system (Click here). Table 25. *a 5 V/DIV. *b 20 msec./DIV. WAVEFORM 15 Table 26. Crankshaft Position Sensor and VVT Sensor ECM Terminal Name Between NE+ and NE- Between EV1+ and EV1- Between EV2+ and EV2- Tester Range 5 V/DIV., 20 msec./DIV. Condition Idling Tip: The wavelength becomes shorter as the engine speed increases. Table 27. *a 5 V/DIV. *b 10 msec./DIV. WAVEFORM 16 Table 28. Air Fuel Ratio Sensor Heater ECM Terminal Name Between HA1A and E04 Between HA2A and E05 Tester Range 5 V/DIV., 10 msec./DIV. Condition Idling with warm engine Tip: The wavelength varies in accordance with the engine operating conditions.