The standard normal 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 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.

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
BATT (A5-4) - E1 (E4-7)	L - BR	Battery (for measuring battery voltage and for ECM memory)	Always	9 to 14 V
+BM (E3-5) - E1 (E4-7)	P - BR	Power source of throttle motor	Always	9 to 14 V
IGSW (A5-17) - E1 (E4-7)	B-W - BR	Engine switch	Engine switch on (IG)	9 to 14 V
+B (A5-6) - E1 (E4-7)	B-R - BR	Power source of ECM	Engine switch on (IG)	9 to 14 V
+B1 (A5-5) - E1 (E4-7)	B-R - BR	Power source of ECM	Engine switch on (IG)	9 to 14 V
OC1+ (E3-34) - OC1- (E3-33)	W - L	Camshaft timing oil control valve (OCV) (Intake side (bank 1))	Engine switch on (IG)	Pulse generation (see waveform 1)
OC2+ (E5-9) - OC2- (E5-8)	P - R	Camshaft timing oil control valve (OCV) (Intake side (bank 2))	Engine switch on (IG)	Pulse generation (see waveform 1)
OE1+ (E3-9) - OE1- (E3-8)	R - Y	Camshaft timing oil control valve (OCV) (Exhaust side (bank 1))	Engine switch on (IG)	Pulse generation (see waveform 1)
OE2+ (E5-24) - OE2- (E5-23)	W - R	Camshaft timing oil control valve (OCV) (Exhaust side (bank 2))	Engine switch on (IG)	Pulse generation (see waveform 1)
MREL (A5-13) - E1 (E4-7)	Y - BR	EFI MAIN relay	Engine switch on (IG)	9 to 14 V
VC (E3-29) - E2 (E3-28)	LG - BR	Power source for sensors (specific voltage)	Engine switch on (IG)	4.5 to 5.0 V
VC2 (E5-29) - E3 (E5-30)	L - BR	Power source for sensors (specific voltage)	Engine switch on (IG)	4.5 to 5.0 V
VG (E5-27) - E2G (E5-26)	G - V	Mass air flow meter	Idling, Shift lever position P or N, A/C switch OFF	0.5 to 3.0 V
THA (E5-25) - E3 (E5-30)	L - BR	Intake air temperature sensor	Idling, Intake air temperature 20°C (68°F)	0.5 to 3.4 V
THW (E5-20) - E2 (E3-28)	Y - BR	Engine coolant temperature sensor	Idling, Engine coolant temperature 80°C (176°F)	0.2 to 1.0 V
VTA1 (E3-23) - E3 (E5-30)	LG - BR	Throttle position sensor (for engine control)	Engine switch on (IG), Throttle valve fully closed	0.5 to 1.2 V
VTA1 (E3-23) - E3 (E5-30)	LG - BR	Throttle position sensor (for engine control)	Engine switch on (IG), Throttle valve fully open	3.2 to 4.8 V
VTA2 (E3-22) - E3 (E5-30)	P - BR	Throttle position sensor (for sensor malfunction detection)	Engine switch on (IG), Accelerator pedal released	2.1 to 3.1 V
VTA2 (E3-22) - E3 (E5-30)	P - BR	Throttle position sensor (for sensor malfunction detection)	Engine switch on (IG), Accelerator pedal depressed	4.5 to 5.0 V
VPA (A6-33) - EPA (A6-34)	G-W - L-Y	Accelerator pedal position sensor (for engine control)	Engine switch on (IG), Accelerator pedal released	0.5 to 1.1 V
VPA (A6-33) - EPA (A6-34)	G-W - L-Y	Accelerator pedal position sensor (for engine control)	Engine switch on (IG), Accelerator pedal depressed	2.6 to 4.5 V
VPA2 (A6-32) - EPA2 (A6-26)	P-L - G-B	Accelerator pedal position sensor (for sensor malfunctioning detection)	Engine switch on (IG), Accelerator pedal released	1.2 to 2.0 V
VPA2 (A6-32) - EPA2 (A6-26)	P-L - G-B	Accelerator pedal position sensor (for sensor malfunctioning detection)	Engine switch on (IG), Accelerator pedal depressed	3.4 to 5.0 V
VCPA (A6-35) - EPA2 (A6-26)	P - G-B	Power source of accelerator pedal position sensor (for VPA)	Engine switch on (IG)	4.5 to 5.0 V
VCP2 (A6-27) - EPA2 (A6-26)	G-R - G-B	Power source of accelerator pedal position sensor (for VPA2)	Engine switch on (IG)	4.5 to 5.0 V
HA1A (E6-6) - E04 (E6-5)	V - W-B	A/F sensor heater	Idling	Below 3.0 V
HA2A (E6-4) - E05 (E6-3)	R - W-B	A/F sensor heater	Idling	Below 3.0 V
HA1A (E6-6) - E04 (E6-5)	V - W-B	A/F sensor heater	Engine switch on (IG)	9 to 14 V
HA2A (E6-4) - E05 (E6-3)	R - W-B	A/F sensor heater	Engine switch on (IG)	9 to 14 V
A1A+ (E6-18) - E1 (E4-7)	R - BR	A/F sensor	Engine switch on (IG)	3.3 V*
A2A+ (E6-28) - E1 (E4-7)	B - BR	A/F sensor	Engine switch on (IG)	3.3 V*
A1A- (E6-17) - E1 (E4-7)	G - BR	A/F sensor	Engine switch on (IG)	3.0 V*
A2A- (E6-27) - E1 (E4-7)	W - BR	A/F sensor	Engine switch on (IG)	3.0 V*
HT1B (A6-2) - E1 (E4-7)	L-R - BR	Heated oxygen sensor heater	Idling	Below 3.0 V
HT2B (A6-1) - E1 (E4-7)	L-W - BR	Heated oxygen sensor heater	Idling	Below 3.0 V
HT1B (A6-2) - E1 (E4-7)	L-R - BR	Heated oxygen sensor heater	Engine switch on (IG)	9 to 14 V
HT2B (A6-1) - E1 (E4-7)	L-W - BR	Heated oxygen sensor heater	Engine switch on (IG)	9 to 14 V
OX1B (A6-28) - O1B- (A6-29)	R - G	Heated oxygen sensor	Maintain engine speed at 2,500 rpm for 2 minutes after warming up sensor	Pulse generation (see waveform 2)
OX2B (A6-17) - O2B- (A6-18)	B - W	Heated oxygen sensor	Maintain engine speed at 2,500 rpm for 2 minutes after warming up sensor	Pulse generation (see waveform 2)
#10 (E3-15) - E1 (E4-7) #20 (E5-17) - E1 (E4-7) #30 (E3-14) - E1 (E4-7) #40 (E5-16) - E1 (E4-7) #50 (E3-13) - E1 (E4-7) #60 (E5-15) - E1 (E4-7)	R - BR GR - BR L - BR P - BR B - BR Y - BR	Injector	Engine switch on (IG)	0 to 5 V
#10 (E3-15) - E1 (E4-7) #20 (E5-17) - E1 (E4-7) #30 (E5-14) - E1 (E4-7) #40 (E5-16) - E1 (E4-7) #50 (E3-13) - E1 (E4-7) #60 (E5-15) - E1 (E4-7)	R - BR GR - BR L - BR P - BR B - BR Y - BR	Injector	Idling	Pulse generation (see waveform 3)
KNK1 (E4-28) - EKNK (E4-30)	B - W	Knock sensor	Maintain engine speed at 4,000 after warming up	Pulse generation (see waveform 4)
KNK2 (E4-29) - EKN2 (E4-31)	R - G	Knock sensor	Maintain engine speed at 4,000 after warming up	Pulse generation (see waveform 4)
VV1+ (E3-21) - VV1- (E3-20)	Y - P	Variable valve timing (VVT) sensor (Intake side (bank 1))	Idling	Pulse generation (see waveform 5)
VV2+ (E3-19) - VV2- (E3-18)	GR - W	Variable valve timing (VVT) sensor (Intake side (bank 2))	Idling	Pulse generation (see waveform 5)
NE+ (E3-32) - NE- (E3-31)	R - G	Crankshaft position sensor	Idling	Pulse generation (see waveform 5, 6)
EV1+ (E5-19) - EV1- (E5-18)	W - G	Variable valve timing (VVT) sensor (Exhaust side (bank 1))	Idling	Pulse generation (see waveform 6)
EV2+ (E6-13) - EV2- (E6-12)	W - B	Variable valve timing (VVT) sensor (Exhaust side (bank 2))	Idling	Pulse generation (see waveform 6)
IGT1 (E5-13) - E1 (E4-7) IGT2 (E3-17) - E1 (E4-7) IGT3 (E5-10) - E1 (E4-7) IGT4 (E5-12) - E1 (E4-7) IGT5 (E3-27) - E1 (E4-7) IGT6 (E3-26) - E1 (E4-7)	GR - BR G - BR B - BR L - BR B - BR BR - BR	Ignition coil (ignition signal)	Idling	Pulse generation (see waveform 7)
IGF1 (E5-7) - E1 (E4-7) IGF2 (E5-6) - E1 (E4-7)	G - BR B - BR	Ignition coil (ignition confirmation signal)	Engine switch on (IG)	4.5 to 5.0 V
IGF1 (E5-7) - E1 (E4-7) IGF2 (E5-6) - E1 (E4-7)	G - BR B - BR	Ignition coil (ignition confirmation signal)	Idling	Pulse generation (see waveform 7)
PRG (E3-11) - E1 (E4-7)	W - BR	VSV for EVAP	Engine switch on (IG)	9 to 14 V
PRG (E3-11) - E1 (E4-7)	W - BR	VSV for EVAP	Idling	Pulse generation (see waveform 8)
SPD (A5-22) - E1 (E4-7)	Y-G - BR	Speed signal from combination meter	Engine switch on (IG), Rotate driving wheel slowly	Pulse generation (see waveform 9)
STA (A5-12) - E1 (E4-7)	R - BR	Starter signal	Cranking	9 to 14 V
STAR (E4-4) - E1 (E4-7)	L - BR	Park/neutral position switch signal	Engine switch on (IG), Other shift position in P or N	9 to 14 V
STAR (E4-4) - E1 (E4-7)	L - BR	Park/neutral position switch signal	Cranking, Shift position in P or N	0 to 3.0 V
STSW (A5-19) - E1 (E4-7)	Y-B - BR	Engine switch signal	Shift lever position P or N, engine switch START	6.0 V or more
STP (A6-4) - E1 (E4-7)	R-B - BR	Stop light switch	Brake pedal depressed	7.5 to 14 V
STP (A6-4) - E1 (E4-7)	R-B - BR	Stop light switch	Brake pedal released	Below 1.5 V
ST1- (A5-8) - E1 (E4-7)	G-W - BR	Stop light switch (opposite to STP terminal)	Engine switch on (IG), Brake pedal depressed	Below 1.5 V
ST1- (A5-8) - E1 (E4-7)	G-W - BR	Stop light switch (opposite to STP terminal)	Engine switch on (IG), Brake pedal released	7.5 to 14 V
M+ (E3-2) - ME01 (E3-4)	B - W-B	Throttle actuator	Idling with warm engine	Pulse generation (see waveform 10)
M- (E3-1) - ME01 (E3-4)	W - W-B	Throttle actuator	Idling with warm engine	Pulse generation (see waveform 11)
FC (A5-14) - E1 (E4-7)	R-G - BR	Fuel pump control	Engine switch on (IG)	9 to 14 V
FC (A5-14) - E1 (E4-7)	R-G - BR	Fuel pump control	Idling	0 to 3 V
FPR (A5-15) - E1 (E4-7)	B-Y - BR	Fuel pump control	Cranking	9 to 14 V
FPR (A5-15) - E1 (E4-7)	B-Y - BR	Fuel pump control	Idling	9 to 14 V
W (A6-8) - E1 (E4-7)	R-L - BR	MIL	Engine switch on (IG)	Below 3.0 V
W (A6-8) - E1 (E4-7)	R-L - BR	MIL	Idling	0 to 3 V
TC (A6-3) - E1 (E4-7)	V - BR	Terminal TC of DLC 3	Engine switch on (IG)	9 to 14 V
TACH (A6-16) - E1 (E4-7)	R-W - BR	Engine speed	Idling	Pulse generation (see waveform 12)
ACIS (E5-3) - E1 (E4-7)	Y - BR	Intake air control valve actuator	Engine switch on (IG)	9 to 14 V
ACIS (E5-3) - E1 (E4-7)	Y - BR	Intake air control valve actuator	Engine RPM is 2,400 to 4,000 rpm and throttle opening percentage is 40 % or more	0 to 3 V
INJF (E6-26) - E1 (E4-7)	BR - BR	Injector injection confirmation signal	Idling	Pulse generation (see waveform 13)
FPF1 (E6-32) - E1 (E4-7)	W - BR	High pressure side fuel pump (spill valve)	Idling	Pulse generation (see waveform 14)
FPD (E6-33) - E1 (E4-7)	G - BR	High pressure side fuel pump (spill valve)	Idling	Pulse generation (see waveform 14)
PR (E6-25) - E2 (E3-28)	R - BR	Fuel pressure sensor	Idling	1.8 to 2.3 V
IAC1 (E6-31) - E1 (E4-7)	G - BR	SCV position sensor	Engine switch off to on (IG)	3.0 to 4.0 V
IA1+ (E6-2) - E01 (E5-2)	L - W-B	DC motor for SCV	Idling	Pulse generation (see waveform 15)
IA1- (E6-1) - E01 (E5-2)	W - W-B	DC motor for SCV	Idling	Pulse generation (see waveform 16)
CANH (A5-25) - E1 (E4-7)	B - BR	CAN communication line	Engine switch on (IG)	Pulse generation (see waveform 17)
CANL (A5-24) - E1 (E4-7)	W - BR	CAN communication line	Engine switch on (IG)	Pulse generation (see waveform 18)

HINT:

*: The ECM terminal voltage is constant regardless of the output voltage from the sensor.

WAVEFORM 1

Sfi System - Terminals Of Ecm. 4GR-FSE ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20

Camshaft timing oil control valve (OCV):
Item	Content
Symbols (Terminal No.)	OC1+ (E3-34) - OC1- (E3-33) OC2+ (E5-9) - OC2- (E5-8) OE1+ (E3-9) - OE1- (E3-8) OE2+ (E5-24) - OE2- (E5-23)
Tool setting	5 V/DIV., 1 ms./DIV.
Condition	Idling

HINT:

The wavelength becomes shorter as the engine rpm increases.

WAVEFORM 2

Heated oxygen sensor:
Item	Content
Symbols (Terminal No.)	OX1B (A6-28) - O1B- (A6- 29) OX2B (A6-17) - O2B- (A6- 18)
Tool setting	0.2 V/DIV., 200 ms./DIV.
Condition	Engine speed maintained at 2,500 rpm for 2 minutes after warming up engine

HINT:

In the Data List, item O2S B1 S2 shows the ECM input values from the heated oxygen sensor.

WAVEFORM 3

Injector No. 1 (to No. 6) injection signal:
Item	Content
Symbols (Terminal No.)	#10 (E3-15) - E1 (E4-7) #20 (E5-17) - E1 (E4-7) #30 (E3-14) - E1 (E4-7) #40 (E5-16) - E1 (E4-7) #50 (E3-13) - E1 (E4-7) #60 (E5-15) - E1 (E4-7)
Tool setting	2 V/DIV., 20 ms./DIV.
Condition	Idling

HINT:

The wavelength becomes shorter as the engine rpm increases.

WAVEFORM 4

Knock sensor:
Item	Content
Symbols (Terminal No.)	KNK1 (E4-28) - EKNK (E4-30) KNK2 (E4-29) - EKN2 (E4- 31)
Tool setting	0.01 to 10 V/DIV., 0.01 to 10 ms./DIV.
Condition	Engine speed maintained a 4,000 rpm after warming up engine

HINT:

The wavelength becomes shorter as the engine rpm increases.

The waveforms and amplitudes displayed differ slightly depending on the vehicle.

WAVEFORM 5

Crankshaft position sensor and VVT sensor for intake camshaft:
Item	Content
Symbols (Terminal No.)	NE+ (E3-32) - NE- (E3-31) VV1+ (E3-21) - VV1- (E3- 20) VV2+ (E3-19) - VV2- (E3- 18)
Tool setting	5 V/DIV., 20 ms./DIV.
Condition	Idling

HINT:

The wavelength becomes shorter as the engine rpm increases.

WAVEFORM 6

Crankshaft position sensor and VVT sensor for exhaust camshaft:
Item	Content
Symbols (Terminal No.)	NE+ (E3-32) - NE- (E3-31) EV1+ (E5-19) - EV1- (E5- 18) EV2+ (E6-13) - EV2- (E6-12)
Tool setting	5 V/DIV., 20 ms./DIV.
Condition	Idling

HINT:

The wavelength becomes shorter as the engine rpm increases.

WAVEFORM 7

Igniter IGT signal (from ECM to igniter) and Igniter IGF signal (from igniter to ECM):
Item	Content
Symbols (Terminal No.)	CH1: IGT1 (E5-13) - E1 (E4-7) CH1: IGT2 (E3-17) - E1 (E4-7) CH1: IGT3 (E5-10) - E1 (E4-7) IGT4 (E5-12) - E1 (E4-7) CH1: IGT5 (E3-27) - E1 (E4-7) CH1: IGT6 (E3-26) - E1 (E4-7) CH2: IGF1 (E5-7) - E1 (E4-7) CH2: IGF2 (E5-6) - E1 (E4-7)
Tool setting	2 V/DIV., 20 ms./DIV.
Condition	Idling

HINT:

The wavelength becomes shorter as the engine rpm increases.

WAVEFORM 8

VSV for EVAP:
Item	Content
Symbols (Terminal No.)	PRG (E3-11) - E1 (E4-7)
Tool setting	5 V/DIV., 50 ms./DIV.
Condition	Idling

HINT:

If the waveform is not similar to the illustration, check the waveform again after idling for 10 minutes or more.

WAVEFORM 9

Vehicle speed signal:
Item	Content
Symbols (Terminal No.)	SPD (A5-22) - E1 (E4-7)
Tool setting	2 V/DIV., 20 ms./DIV.
Condition	Driving at 20 km/h (12 mph)

HINT:

The wavelength becomes shorter as the vehicle speed increases.

WAVEFORM 10

Throttle actuator positive terminal:
Item	Content
Symbols (Terminal No.)	M+ (E3-2) - ME01 (E3-4)
Tool setting	5 V/DIV., 1 ms./DIV.
Condition	Idling with warm engine

HINT:

The duty ratio varies depending on the throttle actuator operation.

WAVEFORM 11

Throttle actuator negative terminal:
Item	Content
Symbols (Terminal No.)	M- (E3-1) - ME01 (E3-4)
Tool setting	5 V/DIV., 1 ms./DIV.
Condition	Idling with warm engine

HINT:

The duty ratio varies depending on the throttle actuator operation.

WAVEFORM 12

Engine speed signal:
Item	Content
Symbols (Terminal No.)	TACH (A6-16) - E1 (E4-7)
Tool setting	5 V/DIV., 10 ms./DIV.
Condition	Idling

HINT:

The wavelength becomes shorter as the engine rpm increases.

WAVEFORM 13

Injector No. 1 (to No. 6) injection signal and Injection confirmation signal:
Item	Content
Symbols (Terminal No.)	CH1: #10 (E3-15) - E1 (E4-7) CH1: #20 (E5-17) - E1 (E4-7) CH1: #30 (E3-14) - E1 (E4-7) CH1: #40 (E5-16) - E1 (E4-7) CH1: #50 (E3-13) - E1 (E4-7) CH1: #60 (E5-15) - E1 (E4-7) CH2: INJF (E6-26) - E1 (E4-7)
Tool setting	2 V/DIV., 20 ms./DIV.
Condition	Idling with warm engine

HINT:

The wavelength becomes shorter as the engine rpm increases.

WAVEFORM 14

High pressure side fuel pump (Spill valve):
Item	Content
Symbols (Terminal No.)	CH1: FPD (E6-33) - E1 (E4-7) CH2: FPF1 (E6-32) - E1 (E4-7)
Tool setting	2 V/DIV., 5 ms./DIV.
Condition	Idling with warm engine

WAVEFORM 15

DC motor for SCV positive terminal:
Item	Content
Symbols (Terminal No.)	IA1+ (E6-2) - E01 (E5-2)
Tool setting	5 V/DIV., 1 ms./DIV.
Condition	Idling with warm engine

WAVEFORM 16

DC motor for SCV negative terminal:
Item	Content
Symbols (Terminal No.)	IA1- (E6-1) - E01 (E5-2)
Tool setting	5 V/DIV., 1 ms./DIV.
Condition	Idling with warm engine

WAVEFORM 17

CAN communication signal:
Item	Content
Symbols (Terminal No.)	CANH (A5-25) - E1 (E4-7)
Tool setting	1 V/DIV., 10 μs/DIV.
Condition	Stop engine and engine switch on (IG)

HINT:

The waveform varies depending on the CAN communication signal.

WAVEFORM 18

CAN communication signal:
Item	Content
Symbols (Terminal No.)	CANL (A5-24) - E1 (E4-7)
Tool setting	1 V/DIV., 10 μs/DIV.
Condition	Stop engine and engine switch on (IG)

HINT:

The waveform varies depending on the CAN communication signal.

LEXUS IS250, IS220d / GSE20 ALE20

4GR-FSE ENGINE CONTROL SYSTEM

Lexus IS250 IS220d GSE20 ALE20

SFI SYSTEM