SFI SYSTEM TERMINALS OF ECM

Tech Tips

The standard voltage, resistance and waveform between each pair of the ECM terminals are 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
A67-1 (BATT) - B53-59 (E1)	P - BR	Battery (for measuring battery voltage and for ECM memory)	Always	11 to 14 V
A67-2 (+B) - B53-59 (E1)	B - BR	Power source of ECM	Ignition switch ON	11 to 14 V
A67-3 (+B2) - B53-59 (E1)	B - BR	Power source of ECM	Ignition switch ON	11 to 14 V
A67-6 (IGSW) - B53-59 (E1)	B - BR	Ignition switch	Ignition switch ON	11 to 14 V
A67-9 (STP) - B53-59 (E1)	V - BR	Stop light switch	Brake pedal depressed	11 to 14 V
A67-9 (STP) - B53-59 (E1)	V - BR	Stop light switch	Brake pedal released	Below 1.5 V
A67-10 (ST1-) - B53-59 (E1)	R-L - BR	Stop light switch	Ignition switch ON, Brake pedal depressed	Below 1.5 V
A67-10 (ST1-) - B53-59 (E1)	R-L - BR	Stop light switch	Ignition switch ON, Brake pedal released	11 to 14 V
A67-13 (CANH) - B53-59 (E1)	Y - BR	CAN communication line	Ignition switch ON	Pulse generation (See waveform 1)
A67-23 (NSW) - B53-59 (E1)*1	G - BR	Park/neutral position switch	Ignition switch ON, shift lever in P or N	Below 1.5 V
A67-23 (NSW) - B53-59 (E1)*1	G - BR	Park/neutral position switch	Ignition switch ON, shift lever not in P or N	6.0 V or higher
A67-26 (CANL) - B53-59 (E1)	W - BR	CAN communication line	Ignition switch ON	Pulse generation (See waveform 2)
A67-27 (W) - B53-59 (E1)	P - BR	MIL	Ignition switch ON (MIL goes off)	Below 3.0 V
A67-27 (W) - B53-59 (E1)	P - BR	MIL	Idling	11 to 14 V
A67-29 (STA) - B53-59 (E1)	LG - BR	Starter signal	Cranking	5.5 V or higher
A67-30 (NEO) - B53-59 (E1)*2	P - BR	Engine speed signal to power management control ECU	Idling with warm engine	Pulse generation (See waveform 3)
A67-31 (TACH) - B53-59 (E1)	GR - BR	Engine speed	Idling	Pulse generation (See waveform 4)
A67-32 (EC) - Body ground	W-B - Body ground	Ground circuit of ECM	Always	Below 1 Ω
A67-33 (TC) - B53-59 (E1)	P - BR	Terminal TC of DLC3	Ignition switch ON	11 to 14 V
A67-41 (FC) - B53-59 (E1)	R - BR	Fuel pump control	Ignition switch ON	11 to 14 V
A67-41 (FC) - B53-59 (E1)	R - BR	Fuel pump control	Idling	Below 1.5 V
A67-44 (SPD) - B53-59 (E1)	Y - BR	Speed signal from combination meter	Vehicle being driven at 20 km/h (12 mph)	Pulse generation (See waveform 5)
A67-46 (MREL) - B53-59 (E1)	W - BR	EFI MAIN relay	Ignition switch ON	11 to 14 V
A67-47 (VPA) - A67-48 (EPA)	L-W - R	Accelerator pedal position sensor (for engine control)	Ignition switch ON, Accelerator pedal released	0.5 to 1.1 V
A67-47 (VPA) - A67-48 (EPA)	L-W - R	Accelerator pedal position sensor (for engine control)	Ignition switch ON, Accelerator pedal fully depressed	2.6 to 4.5 V
A67-49 (VCPA) - A67-48 (EPA)	P-L - R	Power source of accelerator pedal position sensor (for VPA)	Ignition switch ON	4.5 to 5.5 V
A67-50 (VPA2) - A67-51 (EPA2)	Y - G	Accelerator pedal position sensor (for sensor malfunctioning detection)	Ignition switch ON, Accelerator pedal released	1.2 to 2.0 V
A67-50 (VPA2) - A67-51 (EPA2)	Y - G		Ignition switch ON, Accelerator pedal fully depressed	3.4 to 4.75 V
A67-52 (VCP2) - A67-51 (EPA2)	B - G	Power source of accelerator pedal position sensor (for VPA2)	Ignition switch ON	4.5 to 5.5 V
A67-60 (RFC) - B53-59 (E1)	R-G - BR	Cooling fan control	Ignition switch ON, A/C switch on (max cool)	Pulse generation (See waveform 6)
B53-26 (E04) - Body ground	W-B - Body ground	Ground circuit of ECM	Always	Below 1 Ω
B53-27 (HA1A) - B53-26 (E04)	R - W-B	Air fuel ratio sensor heater (sensor 1)	Ignition switch ON	11 to 14 V
B53-27 (HA1A) - B53-26 (E04)	R - W-B	Air fuel ratio sensor heater (sensor 1)	Idling	Pulse generation (See waveform 7)
B53-28 (ME01) - Body ground	W-B - Body ground	Ground circuit of ECM	Always	Below 1 Ω
B53-29 (+BM) - B53-59 (E1)	B - BR	Power source of throttle actuator	Always	11 to 14 V
B53-30 (M-) - B53-28 (ME01)	W - W-B	Throttle actuator	Idling with warm engine	Pulse generation (See waveform 8)
B53-31 (CAN+) - B53-59 (E1)	Y - BR	CAN communication line	Ignition switch ON	Pulse generation (See waveform 1)
B53-32 (CAN-) - B53-59 (E1)	W - BR	CAN communication line	Ignition switch ON	Pulse generation (See waveform 2)
B53-33 (PRG) - B53-59 (E1)	L-B - BR	Purge VSV	Ignition switch ON	11 to 14 V
B53-33 (PRG) - B53-59 (E1)	L-B - BR	Purge VSV	Idling	Pulse generation (See waveform 9)
B53-35 (OC1+) - B53-34 (OC1-)	B - V	Camshaft timing oil control valve assembly (for Intake side)	Idling	Pulse generation (See waveform 10)
B53-37 (OE1+) - B53-36 (OE1-)	BR - P	Camshaft timing oil control valve assembly (for Exhaust side)	Idling	Pulse generation (See waveform 11)
B53-56 (HT1B) - B53-59 (E1)	R - BR	Heated oxygen sensor heater (sensor 2)	Ignition switch ON	11 to 14 V
B53-56 (HT1B) - B53-59 (E1)	R - BR	Heated oxygen sensor heater (sensor 2)	Idling	Below 3.0 V
B53-57 (E01) - Body ground	BR - Body ground	Ground circuit of ECM	Always	Below 1 Ω
B53-58 (E02) - Body ground	W-B - Body ground	Ground circuit of ECM	Always	Below 1 Ω
B53-59 (E1) - Body ground	BR - Body ground	Ground circuit of ECM	Always	Below 1 Ω
B53-60 (M+) - B53-28 (ME01)	R - W-B	Throttle actuator	Idling with warm engine	Pulse generation (See waveform 12)
B53-62 (ACIS) - B53-59 (E1)	R-B - BR	Intake air control valve actuator	Ignition switch ON	11 to 14 V
B53-71 (IGF1) - B53-59 (E1)	Y - BR	Ignition coil assembly (ignition confirmation signal)	Ignition switch ON	4.5 to 5.5 V
B53-71 (IGF1) - B53-59 (E1)	Y - BR	Ignition coil assembly (ignition confirmation signal)	Idling	Pulse generation (See waveform 13)
B53-72 (IGT4) - B53-59 (E1)	B - BR	No. 4 ignition coil assembly (ignition signal)	Idling	Pulse generation (See waveform 13)
B53-73 (IGT3) - B53-59 (E1)	L-B - BR	No. 3 ignition coil assembly (ignition signal)	Idling	Pulse generation (See waveform 13)
B53-74 (IGT2) - B53-59 (E1)	B - BR	No. 2 ignition coil assembly (ignition signal)	Idling	Pulse generation (See waveform 13)
B53-75 (IGT1) - B53-59 (E1)	W-L - BR	No. 1 ignition coil assembly (ignition signal)	Idling	Pulse generation (See waveform 13)
B53-77 (VCPM) - B53-76 (EPIM)	R - BR-R	Power source for vacuum sensor (specific voltage)	Ignition switch ON	4.5 to 5.5 V
B53-78 (PIM) - B53-76 (EPIM)	V - BR-R	Vacuum sensor	Vacuum of 67 kPa (500 mmHg) applied	1.3 to 1.9 V
B53-78 (PIM) - B53-76 (EPIM)	V - BR-R	Vacuum sensor	No vacuum applied	3.3 to 3.9 V
B53-79 (PTO) - B53-109 (EPTO)*1	W - B	Oil pressure sensor	Idling and shift lever in P or N (for CVT), or neutral (for Manual Transaxle)	0.8 to 1.2 V
B53-80 (EV1+) - B53-112 (EV1-)	L - R	Camshaft position sensor (Exhaust side)	Idling with warm engine	Pulse generation (See waveform 14)
B53-82 (VV1+) - B53-115 (VV1-)	G - R	Camshaft position sensor (Intake side)	Idling with warm engine	Pulse generation (See waveform 14)
B53-89 (THEO) - B53-90 (ETHE)	R - LG	Engine oil temperature sensor	Idling with warm engine	0.3 to 0.85 V
B53-95 (#20) - B53-57 (E01)	Y - BR	No. 2 fuel injector assembly	Ignition switch ON	11 to 14 V
B53-95 (#20) - B53-57 (E01)	Y - BR	No. 2 fuel injector assembly	Idling	Pulse generation (See waveform 15)
B53-96 (#30) - B53-57 (E01)	G - BR	No. 3 fuel injector assembly	Ignition switch ON	11 to 14 V
B53-96 (#30) - B53-57 (E01)	G - BR	No. 3 fuel injector assembly	Idling	Pulse generation (See waveform 15)
B53-97 (#40) - B53-57 (E01)	LG - BR	No. 4 fuel injector assembly	Ignition switch ON	11 to 14 V
B53-97 (#40) - B53-57 (E01)	LG - BR	No. 4 fuel injector assembly	Idling	Pulse generation (See waveform 15)
B53-98 (#10) - B53-57 (E01)	V - BR	No. 1 fuel injector assembly	Ignition switch ON	11 to 14 V
B53-98 (#10) - B53-57 (E01)	V - BR	No. 1 fuel injector assembly	Idling	Pulse generation (See waveform 15)
B53-99 (OX1B) - B53-131 (EX1B)	BR - Y	Heated oxygen sensor (sensor 2)	Engine speed maintained at 2500 rpm for 2 minutes after warming up sensor	Pulse generation (See waveform 16)
B53-100 (A1A+) - B53-59 (E1)	L - BR	Air fuel ratio sensor (sensor 1)	Ignition switch ON	3.3 V*3
B53-101 (VTA2) - B53-133 (ETA)	R - BR	Throttle position sensor (for sensor malfunction detection)	Ignition switch ON, Accelerator pedal released	2.1 to 3.1 V
B53-101 (VTA2) - B53-133 (ETA)	R - BR	Throttle position sensor (for sensor malfunction detection)	Ignition switch ON, Accelerator pedal depressed	4.6 to 5.0 V
B53-108 (GE01) - Body ground	BR - Body ground	Shielded ground circuit of throttle actuator	Always	Below 1 Ω
B53-110 (VCPT) - B53-109 (EPTO)*1	P - B	Power source for oil pressure sensor (fixed voltage)	Ignition switch ON	4.5 to 5.5 V
B53-111 (VCE1) - B53-112 (EV1-)	W - R	Power source for camshaft position sensor (specific voltage)	Ignition switch ON	4.5 to 5.5 V
B53-114 (NE+) - B53-113 (NE-)	B - W	Crankshaft position sensor	Idling with warm engine	Pulse generation (See waveform 17)
B53-116 (VCV1) - B53-115 (VV1-)	W - R	Power source for camshaft position sensor (specific voltage)	Ignition switch ON	4.5 to 5.5 V
B53-120 (THW) - B53-119 (ETHW)	B - BR	Engine coolant temperature sensor	Idling, Engine coolant temperature 80°C (176°F)	0.2 to 1.0 V
B53-122 (KNK1) - B53-121 (EKNK)	G - R	Knock sensor	Engine speed maintained at 4000 rpm after warming up engine	Pulse generation (See waveform 18)
B53-132 (A1A-) - B53-59 (E1)	P - BR	Air fuel ratio sensor (sensor 1)	Ignition switch ON	2.9 V*3
B53-134 (VCTA) - B53-133 (ETA)	V - BR	Power source of sensor (specific voltage)	Ignition switch ON	4.5 to 5.5 V
B53-135 (VTA1) - B53-133 (ETA)	P - BR	Throttle position sensor (for engine control)	Ignition switch ON, Throttle valve fully closed	0.5 to 1.1 V
B53-135 (VTA1) - B53-133 (ETA)	P - BR	Throttle position sensor (for engine control)	Ignition switch ON, Throttle valve fully open	3.2 to 4.8 V
B53-136 (SDWN) - B53-59 (E1)	G - BR	Continuously variable valve lift controller	Ignition switch ON	11 to 14 V
B53-137 (VG) - B53-104 (E2G)	V - R	Mass air flow meter	Idling, Shift lever in P or N (for CVT) or neutral (for Manual Transaxle), air conditioner OFF	0.5 to 3.0 V
B53-138 (THA) - B53-139 (ETHA)	P - BR-W	Intake air temperature sensor	Idling, Intake air temperature 20°C (68°F)	0.5 to 3.4 V

*1: for CVT
*2: w/ Entry and Start System
*3: The ECM terminal voltage is constant regardless of the output voltage from the sensor.

WAVEFORM 1


*a	1 V/DIV.
*b	10 μs./DIV.

CAN Communication Signal
ECM Terminal Name	Between CANH and E1 Between CAN+ and E1
Tester Range	1 V/DIV., 10 μs./DIV.
Condition	Engine stop and ignition switch ON

Tech Tips

The waveform varies depending on the CAN communication signal.

WAVEFORM 2


*a	1 V/DIV.
*b	10 μs./DIV.

CAN Communication Signal
ECM Terminal Name	Between CANL and E1 Between CAN- and E1
Tester Range	1 V/DIV., 10 μs./DIV.
Condition	Engine stop and ignition switch ON

Tech Tips

The waveform varies depending on the CAN communication signal.

WAVEFORM 3


*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

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

Tech Tips

The wavelength becomes shorter as the engine speed increases.

WAVEFORM 5


*a	5 V/DIV.
*b	20 ms./DIV.

Vehicle Speed Signal
ECM Terminal Name	Between SPD and E1
Tester Range	5 V/DIV., 20 ms./DIV.
Condition	Driving at 20 km/h (12 mph)

Tech Tips

The wavelength becomes shorter as the vehicle speed increases.

WAVEFORM 6


*a	1 V/DIV.
*b	2 ms./DIV.

Cooling Fan Control Signal
ECM Terminal Name	Between RFC and E1
Tester Range	1 V/DIV., 2 ms./DIV.
Condition	Ignition switch ON, A/C switch on (max cool)

Tech Tips

The duty ratio varies depending on the engine coolant temperature.

WAVEFORM 7


*a	5 V/DIV.
*b	10 ms./DIV.

Air Fuel Ratio Sensor Heater
ECM Terminal Name	Between HA1A and E04
Tester Range	5 V/DIV., 10 ms./DIV.
Condition	Idling with warm engine

Tech Tips

The wavelength becomes shorter as the engine speed increases.

WAVEFORM 8


*a	5 V/DIV.
*b	1 ms./DIV.

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.

WAVEFORM 9


*1	10 V/DIV.
*2	20 ms./DIV.

Purge VSV
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.

WAVEFORM 10


*a	5 V/DIV.
*b	1 ms./DIV.

Camshaft Timing Oil Control Valve Assembly for Intake Camshaft
ECM Terminal Name	Between OC1+ and OC1-
Tester Range	5 V/DIV., 1 ms./DIV.
Condition	Idling

WAVEFORM 11


*a	5 V/DIV.
*b	1 ms./DIV.

Camshaft Timing Oil Control Valve Assembly for Exhaust Camshaft
ECM Terminal Name	Between OE1+ and OE1-
Tester Range	5 V/DIV., 1 ms./DIV.
Condition	Idling

WAVEFORM 12


*a	5 V/DIV.
*b	1 ms./DIV.

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.

WAVEFORM 13


*a	2 V/DIV.
*b	IGT1 to 4
*c	20 ms./DIV.

Ignition Coil Signal (IGT and IGF Signal)
ECM Terminal Name	Between IGT (1 to 4) and E1 Between IGF1 and E1
Tester Range	2 V/DIV., 20 ms./DIV.
Condition	Idling

Tech Tips

The wavelength becomes shorter as the engine speed increases.

WAVEFORM 14


*a	5 V/DIV.
*b	20 ms./DIV.

Camshaft Position Sensor
ECM Terminal Name	Between VV1+ and VV1- Between EV1+ and EV1-
Tester Range	5 V/DIV., 20 ms./DIV.
Condition	Idling with warm engine

Tech Tips

The wavelength becomes shorter as the engine speed increases.

WAVEFORM 15


*1	20 V/DIV.
*2	20 ms./DIV.

No. 1 (to No. 4) Fuel Injector Signal
ECM Terminal Name	Between #10 (to #40) and E01
Tester Range	20 V/DIV., 20 ms./DIV.
Condition	Idling

Tech Tips

The wavelength becomes shorter as the engine speed increases.

WAVEFORM 16


*1	0.2 V/DIV.
*2	200 ms./DIV.

Heated Oxygen Sensor
ECM Terminal Name	Between OX1B and EX1B
Tester Range	0.2 V/DIV., 200 ms./DIV.
Condition	Maintain engine speed at 2500 rpm for 2 minutes after warming up sensor

Tech Tips

In the Data List, the items O2S B1S2 show the values input to the ECM from the heated oxygen sensor.

WAVEFORM 17


*a	5 V/DIV.
*b	20 ms./DIV.

Crankshaft Position Sensor
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.

WAVEFORM 18


*a	1 V/DIV.
*b	1 ms./DIV.

Knock Sensor
ECM Terminal Name	Between KNK1 and EKNK
Tester Range	1 V/DIV., 1 ms./DIV.
Condition	Maintain engine speed at 4000 rpm after warming up engine

Tech Tips

The wavelength becomes shorter as the engine speed increases.
The waveforms and amplitudes displayed differ slightly depending on the vehicle.