Code Charts: Notes
NOTE:
To identify ECM connector terminals, see ECM TERMINAL IDENTIFICATION chart. To test ECM power supply, go to TEST NO . 1 chart.
ECM 26-PIN TERMINAL IDENTIFICATION
| Pin No. | Wire Color | Main Connection |
|---|---|---|
| 1 | Red | Power |
| 2 | Black/Green | Injector Ground |
| 3 | Black/Yellow | DLC (ALDL) |
| 4 | Blue/Yellow | Idle Input (WOT Switch) |
| 5 | Green/Black | AC Input |
| 6 | -- | Not Used |
| 7 | Green | CKP Sensor Signal |
| 8 | Green/White | Pressure Regulator Control |
| 9 | Not Used | 10 |
| Light Green | EGR Duty Solenoid | 11 |
| Not Used | 12 | White/Black |
| Injector No. 2 | 13 | White |
| Injector No. 1 | 14 | Red |
| Power | 15 | -- |
| Not Used | 16 | -- |
| Not Used | 17 | -- |
| Trans Input | 18 | Green/Black |
| Monitor | 19 | Green/Yellow |
| Monitor | 20 | White |
| CKP Sensor Reference | 21 | White/Green |
| EGR VSV | 22 | Green |
| MIL | 23 | Light 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 | Vehicle Speed Sensor |
| 6 | Shield | Oxygen Sensor |
| 7 | Black/White | ECT Sensor Ground |
| 8 | Brown/White | ECT Sensor Input |
| 9 | Blue/White | MAP Sensor Input |
| 10 | -- | Not Used |
| 11 | Black | Ground (Power) |
| 12 | -- | 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 | Black | Airflow Sensor Ground |
| 20 | Green | 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 minimum). Verify battery voltage is greater than 11 volts.