14 KiB
14 KiB
1991-1996 Subaru Impreza
Engine
Turbocharged oposite 4 cylinder EJ20G
Stock ECU
A lot of useful info can be found at [http://www.alcyone.org.uk/ssm/index.html Diagnostics and Datalogging for Subaru SVX]
ECU pinout
This pinout can be partially correct for other Subaru from early 90s (with same yellow ECU connector). Like Legacy/Liberty, SVX and so on.
Connector: Hardware:OEM_connectors#76_pin
EDM connector B44 (JDM - B60)
| Terminal | Type | EDM Signal | JDM Signal | Note | Wire color |
|---|---|---|---|---|---|
| 1 | OD output | Idle air control solenoid: close end | same | ||
| 2 | OD output | Idle air control solenoid: open end | same | ||
| 3 | OD output | Wastgate control solenoid | same | ||
| 4 | OD output | Radiator fan 1 control | same | Ext relay | |
| 5 | Open Emiter output | Self shutoff control | same | +12 output to hold main relay on (serial diode protected on ECU side) | |
| 6 | OD output | Purge control solenoid valve | 5th injector relay (RA-version) | ||
| 7 | OD+Pull-up output | Ignition control #4 | same | ||
| 8 | OD+Pull-up output | Ignition control #3 | same | ||
| 9 | OD+Pull-up output | Ignition control #2 | same | ||
| 10 | OD+Pull-up output | Ignition control #1 | same | ||
| 11 | OD output | Fuel injector #3 | same | ||
| 12 | OD output | Fuel injector #2 | same | ||
| 13 | OD output | Fuel injector #1 | same | ||
| 14 | Power | GND (power supply) | same | (not sure) | |
| 15 | Power | Ignition GND | same | externaly connected to body | |
| 16 | Input | Power steering pressure switch | same | to GND | |
| 17 | OD output | Radiator fan 2 control | same | Ext relay | |
| 18 | - | No connection | same | ||
| 19 | OD output | Jakie Chan lamp | same | ||
| 20 | OD output | Pressure exchange solenoid valve | same | Used to switch pressure sensor between intake and atmosphere | |
| 21 | - | No connection | same | ||
| 22 | OD output | AC cut relay | same | ||
| 23 | OD output | Fuel pump relay | same | ||
| 24 | Power | Injectors GND | same | ||
| 25 | Power | Injectors GND | same | ||
| 26 | OD output | Fuel injector #4 | same |
EDM connector B96 (JDM B116)
| Terminal | Type | EDM Signal | JDM Signal | Note | Wire color |
|---|---|---|---|---|---|
| 1 | Input | Camshaft position sensor: signal + | same | ||
| 2 | Input | Camshaft position sensor: signal - | same | ||
| 3 | Shield | Camshaft position sensor: shield | same | ||
| 4 | Shield | Knock sensor: shield | same | ||
| 5 | Input | Knock sensor: signal | same | ||
| 6 | Input | Idle switch | ? | Throttle fully closed | |
| 7 | Tx | Subaru Select Monitor signal | same | 5V uart, 1953 baud, 8 data bits, 1 stop bit, Even Parity and no flow control | |
| 8 | Rx | Subaru Select Monitor signal | same | 5V uart, 1953 baud, 8 data bits, 1 stop bit, Even Parity and no flow control | |
| 9 | Input | AC switch | same | to gnd | |
| 10 | Input | Starter signal | same | ||
| 11 | Input | ? | Idle switch | Throttle fully closed | |
| 12 | Input | Read memory connector | same | connect to GND | |
| 13 | Input | Test connector | same | connect to GND | |
| 14 | - | No connection | same | ||
| 15 | - | No connection | same | ||
| 16 | Output 5V | Engine tachometer output | same | 2 pulses per rev |
EDM connector B95 (JDM B115)
| Terminal | Type | EDM Signal | JDM Signal | Note | Wire color |
|---|---|---|---|---|---|
| 1 | Power OUT | Throttle position switch: GND/Shield | same | ||
| 2 | Input | Throttle position switch: Signal | same | Fully closed: 4.7V, Fully opened: 0.9V | |
| 3 | Power OUT | Throttle position switch: 5V | same | 5V output | |
| 4 | Input | Crancshaft position sensor: signal + | same | ||
| 5 | Input | Crancshaft position sensor: signal - | same | ||
| 6 | Shield | Crancshaft position sensor: shield | same | ||
| 7 | - | No connection | same | ||
| 8 | - | No connection | same | ||
| 9 | - | No connection | same | ||
| 10 | Input | Neutral switch | same | ||
| 11 | Input | Vehicle speed | same | 5V level from dashboard | |
| 12 | Input | IGN signal | same |
EDM connector B43 (JDM B59)
| Terminal | Type | EDM Signal | JDM Signal | Note | Wire color |
|---|---|---|---|---|---|
| 1 | - | No connection | same | ||
| 2 | Power | Power supply | same | Through main relay | |
| 3 | Power OUT | Pressure sensor: 5V | same | 5V output | |
| 4 | Input | Pressure sensor: signal | same | ||
| 5 | Input | No connection | EGT sensor input | ||
| 6 | Input | O2 sensor: signal | same | Rich: 0.7-1.0, Leam: 0.0-0.2 | |
| 7 | Input | Engine coolant t | same | ||
| 8 | Power OUT | MAF: 12V | same | ||
| 9 | Input | MAF: signal | same | ||
| 10 | Power OUT | MAF: GND | same | ||
| 11 | Power | GND (control system) | same | ||
| 12 | Output | No connection | IP light ses (?) | ||
| 13 | Power | Power supply | same | Through main relay | |
| 14 | - | No connection | same | ||
| 15 | Power | Back-up power supply | same | Always on | |
| 16 | - | No connection | same | ||
| 17 | Input | O2 sensor: shield | same | ||
| 18 | - | No connection | same | ||
| 19 | Power OUT | MAF: shield | same | ||
| 20 | - | No connection | same | ||
| 21 | Power OUT | Pressure, coolant T, EGT sensors GND | same | ||
| 22 | Power | GND (control system) | same |
ECU connection
Impreza 1991+
Liberty RS 1993
Stock ECU internals
Output drivers:
4 x UPA1558H - 4 N-channel power MOSFETs
1 x 4AK19 - 4 N-channlel power MOSFETs (2.5 A) - seems to drive injectors
(2S)A1441 - 5A PNP transistors - seems to drive self-shutdown control output