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