Engine Control Module

Fig. 4 ECM terminal pin identification:

Refer to Fig. 4 for the following pin numbers and corresponding functions:
1. Pin No. 1, ground.
2. Pin No. 2, ground.
3. Pin No. 3, oxygen sensor input.
4. Pin No. 4, system malfunction lamp driver.
5. Pin No. 5, throttle position sensor input.
6. Pin No. 6, battery (memory back-up).
7. Pin No. 7, throttle position reference voltage.
8. Pin No. 8, idle switch input.
9. Pin No. 9, inlet air temperature switch.
10. Pin No. 10, EFE heater relay.
11. Pin No. 11, 12 volts to ignition.
12. Pin No. 12, 12 volts to ignition.
13. Pin No. 13, not used.
14. Pin No. 14, fuel cut-off relay.
15. Pin No. 15, shift indicator lamp driver.
16. Pin No. 16, diagnosis decode.
17. Pin No. 17, coolant temperature sensor input.
18. Pin No. 18, barometric pressure switch.
19. Pin No. 19, ignition coil tachometer input.
20. Pin No. 20, oxygen sensor ground.
21. Pin No. 21, carburetor mixture control solenoid.
22. Pin No. 22, analog ground.