900 Turbo Convertible L4-1985cc 2.0L DOHC Turbo EFI (1994)
ECM Power Supply
+30 voltage is supplied from maxi fuse 2 to the main relay, fuel pump relay and fuse 28. From fuse 28 voltage is supplied to ECM pins 1 and 48.
The ECM uses +30 for its memory. The engine does not start without +30.
+15 voltage is supplied from fuse 17 to ECM pin 60. When +15 is applied to pin 60, the ECM is activated, the main and fuel pump relays operate
and all the injectors are activated for pre-injection dependent on engine temperature. The engine will not start without +15.
Manual/Automatic Programming
The Saab Trionic ECM has the same part number for cars with manual and automatic transmission.
When pin 14 is energized through a position other than P or N being selected, the ECM is programmed for a car with automatic transmission.
On cars with manual transmission, the circuit to pin 14 is open.