ECM Terminal Identification

Fig 1: ECM Terminal Identification Courtesy Isuzu Motor Co

ECM 26-PIN TERMINAL IDENTIFICATION

Pin No.	Wire Color	Main Connection
1	Light/Green Red	Power
2	Black/Green	Injector Ground
3	Black/Yellow	DLC
4	Blue/Yellow	Idle Input (WOT Switch)
5	Black/Green	AC Input
6	Not Used	Not Used
7	Green/Blue	CKP Sensor Signal
8	Light Green/Yellow	Pressure Regulator Control
9	Green/White	Air Management VSV
10	Light Green	EGR Duty Solenoid
11	Not Used	Not Used
12	White/Black	Injector No. 2
13	Violet/White	Injector No. 1
14	Light Green/Black	Power
15	Not Used	Not Used
16	Not Used	Not Used
17	Black/Pink	Trans Input
18	Not Used	Not Used
19	Not Used	Not Used
20	White	CKP Sensor Reference
21	White/Green	EGR VSV
22	Green	MIL
23	Green/White	EVAP VSV
24	White/Blue	Injector No. 4
25	White/Red	Injector No. 3
26	Black/Green	Injector Ground

ECM 22-PIN TERMINAL IDENTIFICATION

Pin No.	Wire Color	Main Connection
1	Blue	Power Signal
2	Black/Red	Ground (Power, Ignition)
3	Green/Orange	MAP Sensor Reference
4	Red/White	Power (Backup)
5	White/Green	Vehicle Speed Sensor
6	Shield	Oxygen Sensor
7	Green/Blue	ECT Sensor Ground
8	Brown/White	ECT Sensor Input
9	Blue/White	MAP Sensor Input
10	0	Not Used
11	Black	Ground (Power)
12	Not Used	Not Used
13	Black/Red	Ground (Power, Ignition)
14	Red	Airflow Sensor (Power)
15	Green/Red	WOT Input (WOT Switch)
16	Yellow/Black	Starter Switch
17	Shield	Airflow Sensor
18	Blue/Red	MAP Sensor Ground
19	Violet	Airflow Sensor Ground
20	Red	Oxygen Sensor Input
21	White	Airflow Sensor Input
22	Black	Ground (Power)

CAUTION: Perform all voltage measurements with ECM harness connector installed. Use a high-impedance voltmeter (10,000 ohm/volt minimum). Verify battery voltage is greater than 11 volts.