Inspection of ECM and Its Circuits

Voltage Check

NOTE:

•As each terminal voltage is affected by battery voltage, check that battery voltage is 11 V or more when ignition is “ON”.
•Voltage with asterisk (*) cannot be measured with voltmeter because it is pulse signal. Use oscilloscope for its check.
•Before performing this inspection, read “Precautions for ECM Circuit Inspection” under Precautions for Engine (M16A).

[A]:	ECM connector (View: [a])

“C01” connector

Terminal No.	Wire color	Circuit	Normal voltage	Condition
C01-1*	WHT	Knock sensor signal circuit 1	1 to 2 V	Engine: Idle speed
C01-1*	WHT	Knock sensor signal circuit 1	Refer to reference waveform. Knock sensor signal
C01-2	LT BLU	MAP sensor power supply circuit	4.5 to 5.5 V	Ignition: “ON”
C01-3*	RED	CAN (high) communication circuit	Refer to reference waveform. CAN communication signal
C01-4*	BLU	Generator LIN communication circuit	Refer to reference waveform. Generator LIN communication signal
C01-5	BLK	TP sensor shield ground circuit	Below 0.3 V	Ignition: “ON”
C01-6	BEG	MAP sensor ground circuit	Below 0.3 V	Ignition: “ON”
C01-7*	RED	HO2S-1 signal circuit	Refer to reference waveform. HO2S-1 signal
C01-8	WHT	TP sensor (sub) signal circuit	4.1 to 4.7 V	Ignition: “ON” Accelerator pedal: Released
C01-8	WHT	TP sensor (sub) signal circuit	0.3 to 0.9 V	Ignition: “ON” Accelerator pedal: Fully depressed
C01-9	—	—	—	—
C01-10*	RED	Fuel injector No.3 drive circuit	10 to 14 V	Ignition: “ON”
C01-10*	RED	Fuel injector No.3 drive circuit	Refer to reference waveform. •Fuel injector signal •Fuel injector No.3 signal and ignition coil No.3 signal
C01-11*	YEL	Fuel injector No.1 drive circuit	10 to 14 V	Ignition: “ON”
C01-11*	YEL	Fuel injector No.1 drive circuit	Refer to reference waveform. •Fuel injector signal •Fuel injector No.1 signal and ignition coil No.1 signal
C01-12*	WHT	Fuel injector No.2 drive circuit	10 to 14 V	Ignition: “ON”
C01-12*	WHT	Fuel injector No.2 drive circuit	Refer to reference waveform. •Fuel injector signal •Fuel injector No.2 signal and ignition coil No.2 signal
C01-13*	BLU	Knock sensor signal circuit 2	1 to 2 V	Engine: Idle speed
C01-13*	BLU	Knock sensor signal circuit 2	Refer to reference waveform. Knock sensor signal
C01-14	RED	TP sensor power supply circuit	4.5 to 5.5 V	Ignition: “ON”
C01-15*	WHT	CAN (low) communication circuit	Refer to reference waveform. CAN communication signal
C01-16	YEL	HO2S-2 ground circuit	Below 0.3 V	Ignition: “ON”
C01-17	BLK	TP sensor ground circuit	Below 0.3 V	Ignition: “ON”
C01-18	GRN	HO2S-1 ground circuit	Below 0.3 V	Ignition: “ON”
C01-19*	BRN	HO2S-2 signal circuit	Refer to reference waveform. HO2S-2 signal
C01-20	BLU	ECT sensor signal circuit	3.4 to 3.5 V	Ignition: “ON” ECT: 0 °C (32 °F)
			1.1 to 1.2 V	Ignition: “ON” ECT: 50 °C (122 °F)
			0.3 to 0.4 V	Ignition: “ON” ECT: 100 °C (212 °F)
C01-21	—	—	—	—
C01-22*	LT GRN	Fuel injector No.4 drive circuit	10 to 14 V	Ignition: “ON”
C01-22*	LT GRN	Fuel injector No.4 drive circuit	Refer to reference waveform. •Fuel injector signal •Fuel injector No.4 signal and ignition coil No.4 signal
C01-23	—	—	—	—
C01-24	—	—	—	—
C01-25	YEL	IAT sensor signal circuit	Approx. 2.5 V	Ignition: “ON” IAT: 20 °C (68°F)
C01-25	YEL	IAT sensor signal circuit	Approx. 0.6 V	Ignition: “ON” IAT: 80 °C (176 °F)
C01-26	GRN	TP sensor (main) signal circuit	0.4 to 0.6 V	Ignition: “ON” Accelerator pedal: Released
C01-26	GRN	TP sensor (main) signal circuit	4.1 to 4.7 V	Ignition: “ON” Accelerator pedal: Fully depressed
C01-27	—	—	—	—
C01-28*	RED	CMP sensor signal circuit	approx. 0 V or 4 to 5 V	Ignition: “ON”
C01-28*	RED	CMP sensor signal circuit	Refer to reference waveform. CMP sensor signal and CKP sensor signal
C01-29	—	—	—	—
C01-30	—	—	—	—
C01-31*	PNK	CKP sensor signal circuit	approx. 0 V or 4 to 5 V	Ignition: “ON”
C01-31*	PNK	CKP sensor signal circuit	Refer to reference waveform. CMP sensor signal and CKP sensor signal
C01-32*	YEL	Ignition coil No.1 drive circuit	approx. 0 V	Ignition: “ON”
C01-32*	YEL	Ignition coil No.1 drive circuit	Refer to reference waveform. •Ignition coil signal •Fuel injector No.1 signal and ignition coil No.1 signal
C01-33*	GRN	Ignition coil No.2 drive circuit	approx. 0 V	Ignition: “ON”
C01-33*	GRN	Ignition coil No.2 drive circuit	Refer to reference waveform. •Ignition coil signal •Fuel injector No.2 signal and ignition coil No.2 signal
C01-34*	BRN	Ignition coil No.3 drive circuit	approx. 0 V	Ignition: “ON”
C01-34*	BRN	Ignition coil No.3 drive circuit	Refer to reference waveform. •Ignition coil signal •Fuel injector No.3 signal and ignition coil No.3 signal
C01-35*	PNK	Ignition coil No.4 drive circuit	approx. 0 V	Ignition: “ON”
C01-35*	PNK	Ignition coil No.4 drive circuit	Refer to reference waveform. •Ignition coil signal •Fuel injector No.4 signal and ignition coil No.4 signal
C01-36	BEG	IAT sensor ground circuit	Below 0.3 V	Ignition: “ON”
C01-37	LT BLU	HO2S-1 shield ground circuit	Below 0.3 V	Ignition: “ON”
C01-38	BEG	HO2S-2 shield ground circuit	Below 0.3 V	Ignition: “ON”
C01-39	BRN	MAP sensor signal circuit	4.0 to 4.2 V	Ignition: “ON”
			1.5 to 1.8 V	Engine: Idle speed after warming up Barometric pressure: 100 kPa, 760 mmHg
			Refer to reference waveform. MAP sensor signal
C01-40*	BLK	EVAP canister purge valve drive circuit	10 to 14 V	Ignition: “ON”
C01-40*	BLK	EVAP canister purge valve drive circuit	Refer to reference waveform. EVAP canister purge valve signal
C01-41*	BLU	OCV drive circuit	10 to 14 V	Ignition: “ON”
C01-41*	BLU	OCV drive circuit	Refer to reference waveform. OCV signal
C01-42	—	—	—	—
C01-43	—	—	—	—
C01-44	—	—	—	—
C01-45	BEG	ECT sensor ground circuit	Below 0.3 V	Ignition: “ON”
C01-46	—	—	—	—
C01-47	—	—	—	—
C01-48*	YEL	IMT valve actuator drive circuit (open)	Below 0.3 V	Ignition: “ON”
C01-48*	YEL	IMT valve actuator drive circuit (open)	Refer to reference waveform. IMT valve actuator signal
C01-49*	RED	HO2S-2 heater drive circuit	10 to 14 V	Ignition: “ON”
C01-49*	RED	HO2S-2 heater drive circuit	Refer to reference waveform. HO2S-2 heater signal
C01-50	BLK	ECM ground circuit 1	Below 0.3 V	Ignition: “ON”
C01-51	BLK	ECM ground circuit 2	Below 0.3 V	Ignition: “ON”
C01-52*	YEL	HO2S-1 heater drive circuit	Refer to reference waveform. HO2S-1 heater signal
C01-53*	LT GRN	Throttle actuator drive circuit (close)	Refer to reference waveform. Throttle actuator signal
C01-54*	BRN	Throttle actuator drive circuit (open)	Refer to reference waveform. Throttle actuator signal
C01-55	—	—	—	—
C01-56*	BLU	IMT valve actuator drive circuit (close)	Below 0.3 V	Ignition: “ON”
C01-56*	BLU	IMT valve actuator drive circuit (close)	Refer to reference waveform. IMT valve actuator signal

“E01” connector

Terminal No.	Wire color	Circuit	Normal voltage	Condition
E01-1*	RED	CAN (high) communication circuit	Refer to reference waveform. CAN communication signal
E01-2*	WHT	CAN (low) communication circuit	Refer to reference waveform. CAN communication signal
E01-3	—	—	—	—
E01-4	BLK	APP sensor (sub) power supply circuit	4.5 to 5.5 V	Ignition: “ON”
E01-5	YEL	APP sensor (sub) signal circuit	0.2 to 0.5 V	Ignition: “ON” Accelerator pedal: Released
E01-5	YEL	APP sensor (sub) signal circuit	1.8 to 2.2 V	Ignition: “ON” Accelerator pedal: Fully depressed
E01-6	WHT	Ignition ON signal circuit	approx. 0 V	Ignition: “OFF” or “ACC”
E01-6	WHT	Ignition ON signal circuit	10 to 14 V	Ignition: “ON”
E01-7	—	—	—	—
E01-8	LT GRN	A/C refrigerant pressure sensor ground circuit (A/C model)	Below 0.3 V	Ignition: “ON”
E01-9	—	—	—	—
E01-10	—	—	—	—
E01-11	—	—	—	—
E01-12	—	—	—	—
E01-13	—	—	—	—
E01-14	GRY	A/C refrigerant pressure sensor supply circuit (A/C model)	4.5 to 5.5 V	Ignition: “ON”
E01-15	BRN	APP sensor (main) power supply circuit	4.5 to 5.5 V	Ignition: “ON”
E01-16	GRN	CPP No.1 switch signal circuit (M/T model) (if equipped) or transmission range sensor signal circuit (A/T model)	approx. 0 V	Ignition: “ON” Clutch pedal: Fully depressed (M/T model) Select lever: “P” or “N” (A/T model)
E01-16	GRN		10 to 14 V	Ignition: “ON” Clutch pedal: Released (M/T model) Select lever: Other than “P” or “N” (A/T model)
E01-17	RED	A/C refrigerant pressure sensor signal circuit (A/C model)	0.9 to 1.3 V	Engine: Running A/C compressor: Not operating
E01-17	RED	A/C refrigerant pressure sensor signal circuit (A/C model)	1.3 to 2.2 V	Engine: Running A/C compressor: Operating
E01-18	LT BLU	APP sensor (main) signal circuit	0.6 to 0.9 V	Ignition: “ON” Accelerator pedal: Released
E01-18	LT BLU	APP sensor (main) signal circuit	3.7 to 4.4 V	Ignition: “ON” Accelerator pedal: Fully depressed
E01-19	GRY	Blower motor signal circuit (non-A/C model and manual A/C model)	approx. 0 V	Ignition: “ON” Blower speed switch: 2nd or more
			5 to 7 V	Ignition: “ON” Blower speed switch: 1st position
			10 to 14 V	Ignition: “ON” Blower speed switch: OFF
E01-20	WHT	APP sensor (sub) ground circuit	Below 0.3 V	Ignition: “ON”
E01-21	BLU	APP sensor (main) ground circuit	Below 0.3 V	Ignition: “ON”
E01-22	—	—	—	—
E01-23	BEG	Cruise control command switch ground circuit (if equipped)	Below 0.3 V	Ignition: “ON”
E01-24	—	—	—	—
E01-25	—	—	—	—
E01-26	—	—	—	—
E01-27	PPL	CPP No.2 switch signal circuit (M/T model)	10 to 14 V	Ignition: “ON” Clutch pedal: Released
E01-27	PPL	CPP No.2 switch signal circuit (M/T model)	approx. 0 V	Ignition: “ON” Clutch pedal: Fully depressed
E01-28	YEL	Brake light switch signal circuit (normal open)	approx. 0 V	Ignition: “ON” Brake pedal: Released
E01-28	YEL	Brake light switch signal circuit (normal open)	10 to 14 V	Ignition: “ON” Brake pedal: Fully depressed
E01-29	—	—	—	—
E01-30	LT GRN	Cruise control command switch signal circuit (if equipped)	3.5 to 4.3 V	Ignition: “ON”
			2.9 V	Ignition: “ON” Distance switch: ON (Distance switch kept depressed)
			2.0 to 2.4 V	Ignition: “ON” “RES / +” switch: ON (RES / + switch kept depressed)
			1.2 to 1.6 V	Ignition: “ON” “SET / –” switch: ON (SET / – switch kept depressed)
			0.88 V	Ignition: “ON” “LIMIT” switch: ON (LIMIT switch kept depressed)
			0.3 to 0.6 V	Ignition: “ON” “CANCEL” switch: ON (CANCEL switch kept depressed)
			0 to 0.2 V	Ignition: “ON” “CRUISE” switch: ON (CRUISE switch kept depressed)
E01-31	—	—	—	—
E01-32	—	—	—	—
E01-33	—	—	—	—
E01-34	—	—	—	—
E01-35	—	—	—	—
E01-36	GRN	Radiator cooling fan relay No.2 and No.3 drive circuit	10 to 14 V	Engine: Idle speed ECT < 100 °C (212 °F) A/C switch: OFF
E01-36	GRN	Radiator cooling fan relay No.2 and No.3 drive circuit	approx. 0 V	Engine: Idle speed ECT > 103 °C (217.4 °F) A/C switch: OFF
E01-37	—	—	—	—
E01-38	—	—	—	—
E01-39	BLU	Brake switch signal circuit (normal close)	10 to 14 V	Ignition: “ON” Brake pedal: Released
E01-39	BLU	Brake switch signal circuit (normal close)	approx. 0 V	Ignition: “ON” Brake pedal: Fully depressed
E01-40	—	—	—	—
E01-41	—	—	—	—
E01-42	—	—	—	—
E01-43	—	—	—	—
E01-44	—	—	—	—
E01-45	—	—	—	—
E01-46	LT GRN	Radiator cooling fan relay No.1 drive circuit	10 to 14 V	Engine: Idle speed ECT < 97 °C (206.6 °F) A/C switch: OFF
E01-46	LT GRN	Radiator cooling fan relay No.1 drive circuit	approx. 0 V	Engine: Idle speed ECT > 100 °C (212 °F) A/C switch: OFF
E01-47	—	—	—	—
E01-48	GRY	A/C compressor relay drive circuit (A/C model)	10 to 15 V	A/C compressor: Not operating
E01-48	GRY	A/C compressor relay drive circuit (A/C model)	approx. 0 V	A/C compressor: Operating
E01-49	PNK	Main relay drive circuit	approx. 0 V	Ignition: “ON”
E01-49	PNK	Main relay drive circuit	10 to 14 V	Ignition: 25 sec. after ignition “OFF”
E01-50	—	—	—	—
E01-51	—	—	—	—
E01-52	LT GRN	Starting motor control relay signal circuit	approx. 0 V	Ignition: “ON”
E01-52	LT GRN	Starting motor control relay signal circuit	6 to 12 V	Ignition: “START”
E01-53	—	—	—	—
E01-54	GRN	Fuel pump relay drive circuit	Refer to reference waveform. Fuel pump relay signal
E01-55	BLU	Main power supply circuit 2	10 to 14 V	Ignition: “ON”
E01-56	BLU	Main power supply circuit 1	10 to 14 V	Ignition: “ON”

Reference Waveform

NOTE:

•Display includes the following types of data:

[A]:	Waveform of channel 1	[C]:	VOLT/DIV of each channel
[B]:	Ground level of each channel	[D]:	TIME/DIV

•Waveform varies depending on measurement condition and vehicle spec.

Fuel injector signal

Channel	Probe	Terminal No.
1	+	C01-11 (No.1)
		C01-12 (No.2)
		C01-10 (No.3)
		C01-22 (No.4)
	–	C01-50

Measurement condition

•Engine: Idle speed after warming up

1.	Fuel injector signal

Fuel injector No.1 signal and ignition coil No.1 signal

Fuel injector No.1 signal (1)

Channel	Probe	Terminal No.
1	+	C01-11
1	–	C01-50

Ignition coil No.1 signal (2)

Channel	Probe	Terminal No.
2	+	C01-32
2	–	C01-50

CMP sensor signal (3)

Channel	Probe	Terminal No.
3	+	C01-28
3	–	C01-50

CKP sensor signal (4)

Channel	Probe	Terminal No.
4	+	C01-31
4	–	C01-50

Measurement condition

•Engine: Idle speed after warming up

Camshaft 360° angle

Crankshaft 720° angle

Fuel injector No.2 signal and ignition coil No.2 signal

Fuel injector No.2 signal (1)

Channel	Probe	Terminal No.
1	+	C01-12
1	–	C01-50

Ignition coil No.2 signal (2)

Channel	Probe	Terminal No.
2	+	C01-33
2	–	C01-50

CMP sensor signal (3)

Channel	Probe	Terminal No.
3	+	C01-28
3	–	C01-50

CKP sensor signal (4)

Channel	Probe	Terminal No.
4	+	C01-31
4	–	C01-50

Measurement condition

•Engine: Idle speed after warming up

Camshaft 360° angle

Crankshaft 720° angle

Fuel injector No.3 signal and ignition coil No.3 signal

Fuel injector No.3 signal (1)

Channel	Probe	Terminal No.
1	+	C01-10
1	–	C01-50

Ignition coil No.3 signal (2)

Channel	Probe	Terminal No.
2	+	C01-34
2	–	C01-50

CMP sensor signal (3)

Channel	Probe	Terminal No.
3	+	C01-28
3	–	C01-50

CKP sensor signal (4)

Channel	Probe	Terminal No.
4	+	C01-31
4	–	C01-50

Measurement condition

•Engine: Idle speed after warming up

Camshaft 360° angle

Crankshaft 720° angle

Fuel injector No.4 signal and ignition coil No.4 signal

Fuel injector No.4 signal (1)

Channel	Probe	Terminal No.
1	+	C01-22
1	–	C01-50

Ignition coil No.4 signal (2)

Channel	Probe	Terminal No.
2	+	C01-35
2	–	C01-50

CMP sensor signal (3)

Channel	Probe	Terminal No.
3	+	C01-28
3	–	C01-50

CKP sensor signal (4)

Channel	Probe	Terminal No.
4	+	C01-31
4	–	C01-50

Measurement condition

•Engine: Idle speed after warming up

Camshaft 360° angle

Crankshaft 720° angle

HO2S-2 heater signal

Channel	Probe	Terminal No.
1	+	C01-49
1	–	C01-50

Measurement condition

•Engine: Idle speed after warming up

1.	HO2S-2 heater signal

HO2S-2 signal

Channel	Probe	Terminal No.
1	+	C01-19
1	–	C01-50

Measurement condition

•Engine: Racing after warming up

1.	Engine: Racing	3.	HO2S-2 signal
2.	Engine: Idle speed

Ignition coil signal

Channel	Probe	Terminal No.
1	+	C01-32 (No.1)
		C01-33 (No.2)
		C01-34 (No.3)
		C01-35 (No.4)
	–	C01-50

Measurement condition

•Engine: Idle speed after warming up

1.	Ignition coil signal

HO2S-1 heater signal

Channel	Probe	Terminal No.
1	+	C01-52
1	–	C01-50

Measurement condition

•Engine: Idle speed after warming up

1.	HO2S-1 heater signal

HO2S-1 signal

Channel	Probe	Terminal No.
1	+	C01-7
1	–	C01-50

Measurement condition

•Engine: Idle speed after warming up

1.	HO2S-1 signal

EVAP canister purge valve signal

Channel	Probe	Terminal No.
1	+	C01-40
1	–	C01-50

Measurement condition

•EVAP canister purge valve: 10% open
(using “Active Test” on SUZUKI scan tool)

1.	EVAP canister purge valve signal

Throttle actuator signal

Throttle actuator signal (Open) (1)

Channel	Probe	Terminal No.
1	+	C01-54
1	–	C01-50

Throttle actuator signal (Close) (2)

Channel	Probe	Terminal No.
2	+	C01-53
2	–	C01-50

Measurement condition

•Ignition: For 10 sec. after ignition “ON”
•Accelerator pedal: Idle position

Measurement condition

•Ignition: More than 10 sec. after ignition “ON”
•Accelerator pedal: Idle position

Measurement condition

•Ignition: “ON”
•Accelerator pedal: Fully depressed position

CMP sensor signal and CKP sensor signal

CMP sensor signal (1)

Channel	Probe	Terminal No.
1	+	C01-28
1	–	C01-50

CKP sensor signal (2)

Channel	Probe	Terminal No.
3	+	C01-31
3	–	C01-50

Measurement condition

•Engine: Idle speed after warming up

Knock sensor signal

Channel	Probe	Terminal No.
1	+	C01-1
	+	C01-13
	–	C01-50

Measurement condition

•Engine: Running at 4,000 rpm after warming up

1.	Knock sensor signal

MAP sensor signal

MAP sensor signal (1)

Channel	Probe	Terminal No.
1	+	C01-39
1	–	C01-50

TP sensor (Main) signal circuit (2)

Channel	Probe	Terminal No.
2	+	C01-26
2	–	C01-50

Measurement condition

•Engine: Racing after warming up

Engine: Idle speed

Engine: Racing

OCV signal

Channel	Probe	Terminal No.
1	+	C01-41
1	–	C01-50

Measurement condition

•Engine: Racing after warming up
•Accelerator pedal: Fully depressed position

Fuel pump relay signal

Channel	Probe	Terminal No.
1	+	E01-54
1	–	C01-50

Measurement condition

•Ignition: “OFF” → “ON” → “START”

1.	Fuel pump relay signal	3.	Ignition: “ON”
2.	Ignition: “OFF”	4.	Ignition: “START”

CAN communication signal

CAN (High) communication signal (1)

Channel	Probe	Terminal No.
1	+	C01-3 E01-1
1	–	C01-50

CAN (Low) communication signal (2)

Channel	Probe	Terminal No.
2	+	C01-15 E01-2
2	–	C01-50

Measurement condition

•Engine: Stop
•Ignition: “ON”

IMT valve actuator signal

IMT valve actuator signal (Close) (1)

Channel	Probe	Terminal No.
1	+	C01-56
1	–	C01-50

IMT valve actuator signal (Open) (2)

Channel	Probe	Terminal No.
2	+	C01-48
2	–	C01-50

Measurement condition

•IMT valve: OPEN → CLOSE (using “Active Test” on SUZUKI scan tool)

•IMT valve: CLOSE → OPEN (using “Active Test” on SUZUKI scan tool)

Generator LIN communication signal

Channel	Probe	Terminal No.
1	+	C01-4
1	–	C01-50

Measurement condition

•Engine: Idle speed after warming up

1.	Generator LIN communication signal