tiago Posted February 22, 2023 Report Share Posted February 22, 2023 Hi, I have a Subaru Sti that is having the engine rebuilt and while it's not done I am planning to use the Link G4+ that I already have, to run my other Impreza 1999 non-turbo. I already have the connector to create a jumper harness and be able to use it as a plug-and-play unit. I am trying to figure out the Link G4+ pinout, can someone help with it? I realized that the G4X manual was updated and now it includes all the pins. I need something similar for the G4+. Subaru V5-6 WRX/STi - Link G4+ Pin Link ECU Function B134-1 Aux 1 Fuel Pump Relay B134-2 B134-3 B134-4 Aux – Ign 3 Fan Relay 1 B134-5 Aux 6 Idle Stepper Motor B134-6 Aux 5 Idle Stepper Motor B134-7 Ignition 1 Ignition 1 B134-8 B134-9 B134-10 B134-11 B134-12 B134-13 Aux – Ign 4 Fan Relay 2 B134-14 Aux 7 Idle Stepper Motor B134-15 Aux 8 Idle Stepper Motor B134-16 Ignition 2 Ignition 2 B134-17 B134-18 Injection 4 Injection 4 B134-19 Aux 2 Wastegate Solenoid B134-20 B134-21 Aux 1 Not Used B134-22 Aux 3 A/C Out B134-23 B134-24 B134-25 Injection 3 Injection 3 B134-26 B134-27 B134-28 Aux – Inj 5 CE Light B134-29 B134-30 B134-31 Injection 1 Injection 1 B134-32 Injection 2 Injection 2 B135-1 DI 2 Pow er Steer Signal B135-2 DI 1 Start Signal B135-3 B135-4 B135-5 B135-6 B135-7 B135-8 B135-9 B135-10 B135-11 DI 6 A/C In B135-12 B135-13 B135-14 Aux 4 Tacho B135-15 B135-16 B135-17 B135-18 B135-19 B135-20 B135-21 B135-22 B135-23 B135-24 B135-25 B135-26 DI 3 Vehicle Speed B135-27 B135-28 B135-29 B135-30 B135-31 B135-32 B136-1 An Volt 2 AFM Signal B136-2 B136-3 B136-4 B136-5 B136-6 B136-7 An Volt 1 Factory MAP Sensor B136-8 Aux - Inj 6 14V Main Relay B136-9 B136-10 B136-11 B136-12 B136-13 B136-14 B136-15 B136-16 B136-17 Ground B136-18 B136-19 An Temp 3 (V1.1 PCB ONLY) B136-20 An Volt 3 TPS (Main) B136-21 An Volt 4 Oxygen Sensor Signal B136-22 B136-23 B136-24 B136-25 DI 4 Ignition Sw itch B136-26 Knock 1 Knock sensor signal B136-27 B136-28 An Temp 1 ECT B136-29 B136-30 B136-31 B136-32 B136-33 Quote Link to comment Share on other sites More sharing options...
Adamw Posted February 22, 2023 Report Share Posted February 22, 2023 The G4X pinout was the same until a recent update. So below is an older G4X pinout which should match what you have. Assuming yours is a V1.3 bottom board. Quote Link to comment Share on other sites More sharing options...
tiago Posted March 2, 2023 Author Report Share Posted March 2, 2023 Thank you for the replay @Adamw. Checking my Link board, I can see printed on it V1.3 and a sticker showing PCB REV V1.5. I am assuming I do have the 1.3 board. Since I will not run the MAF plus a bunch of other oem stuff, I ended up with this configuration. The red rows are things I will not be using. I will be adding IAT and MAP later, just trying to figure out the basic oem stuff first. I have a couple of questions: For sensor ground (Injectors, Temperature, TPS, etc) can I use any Link ground like the pins: B134-17, B136-17, B136-18 Do the crank and camshaft pins look fine to you? Do you have any other input or tips? OEM ECU Subaru Impreza 1999 RS Subaru V5-6 WRX/STi - Link G4+ Pin Function Pin Function B135-1 Crank Position Sensor Signal + B136-5 Trig 1 / Trig 2 via dip switch B135-8 Signal - B136-24 Ground (Signal) B135-10 Shield B136-23 Ground (triggers) B135-2 Camshaft Position Sensor Signal + B136-6 Trig 2 / Trig 1 via dip switch B135-9 Signal - B136-30 Ground (Signal) B135-10 Shield B136-23 Ground (triggers) B136-5 Mass Airflow Sensor Signal B136-15 Power B136-25 Shield B136-8 GND B136-17 Throttle Position Sensor Signal B136-20 An Volt 3 TPS (Main) B136-15 Power B136-12 5v Out B136-16 GND (sensor) B136-17 Ground B136-7 Front O2 Signal (+) B136-20 Signal (-) B136-23 Shield B136-18 Rear O2 Signal B136-24 Shield B136-16 GND (sensor) B134-22 Front O2 heater Signal 1 B134-23 Signal 2 B134-21 Rear O2 heater B136-14 Coolant Temp Sensor Signal B136-28 An Temp 1 ECT B136-16 GND (sensor) B134-17 Ground B135-24 Vehicle Speed Signal B135-26 DI 3 Vehicle Speed B135-28 Starter Switch B135-2 DI 1 Start Signal B135-27 A/C Switch B135-11 DI 6 A/C In B135-7 Ignition Switch B136-25 DI 4 Ignition Switch B135-26 Neutral Position Switch (MT) B135-26 Neutral Position Switch (AT) B135-14 Test Mode Connector B136-4 Knock Sensor Signal B136-26 Knock 1 Knock sensor signal B136-25 Shield B136-29 Ground (Knock Shield) B135-25 AT/MT Identific B136-9 Backup Power Sup B136-32 Injector 6 (Aux) ECU Hold Power B136-1 Control Unit Power Supply B136-8 14V Main Relay ECU Power B136-2 B136-9 14V Main Relay ECU Power B136-15 Sensor Power Supply B136-12 5v Out B135-20 Line end check 1 B134-25 Ignition Control #1, #2 B134-7 Ignition 1 Ignition 1 B134-26 #3, #4 B134-16 Ignition 2 Ignition 2 B134-4 Fuel Injectors #1 B134-31 Injection 1 Injection 1 B134-13 #2 B134-32 Injection 2 Injection 2 B134-14 #3 B134-25 Injection 3 Injection 3 B134-15 #4 B134-18 Injection 4 Injection 4 B134-5 Idle Air Control Signal 1 B134-5 Aux 5 Idle Stepper Motor B134-6 Signal 2 B134-6 Aux 6 Idle Stepper Motor B134-19 Signal 3 B134-14 Aux 7 Idle Stepper Motor B134-29 Signal 4 B134-15 Aux 8 Idle Stepper Motor B136-2 Power Supply B136-12 5v Out B134-16 Fuel Pump Relay B134-1 Aux 1 Fuel Pump Relay B134-17 A/C Relay Control B134-22 Aux 3 A/C Out B134-3 Rad Fan Relay 1 B134-4 Aux – Ign 3 Fan Relay 1 B134-2 Rad Fan Relay 2 B134-13 Aux – Ign 4 Fan Relay 2 B135-19 Self Shutoff Control B134-11 Check Engine Light B134-28 Aux – Inj 5 CE Light B134-30 Engine Speed Output B135-14 Aux 4 Tacho B135-16 Torque Control 1 Signal B135-17 Torque Control 2 Signal B134-31 Torque control cut signal B136-11 MAF Signal for AT B134-2 Purge Control Valve B135-13 Power steering switch B135-1 DI 2 Power Steering Signal B136-29 Atmospheric Pressure Sensor Signal B136-15 Power B136-16 GND (sensor) B134-9 Pressure source switching valve B136-26 Fuel temperature sensor B136-27 Fuel level sensor B136-12 Fuel Tank Pressure Sensor Signal B136-15 Power Supply B136-16 GND (sensor) B134-1 Fuel Tank Pressure Control Valve B134-10 Drain Valve B135-4 AT Diagnostic Input Signal B135-21 Line end check 2 B136-16 GND (Sensors) B134-17 Ground B134-7 GND (Injectors) B134-17 Ground B134-27 GND (ignition system) B136-31 Ground (MAF) B134-8 GND (Power Supply) B136-18 Ground B136-21 GND (Control Systems) B134-8 Ground B136-22 B134-9 Ground B134-35 GND (O2 heater 1) B134-34 GND (O2 heater 2) I also have this editable file, if you prefer take a look at the editable spreadsheet: https://docs.google.com/spreadsheets/d/1uAMqdqBd-K18KtJRfYD8YoncJ6ZWb2UfyDar15K4iGw/edit?usp=sharing Quote Link to comment Share on other sites More sharing options...
Adamw Posted March 2, 2023 Report Share Posted March 2, 2023 Sensor ground pins are B136-23,24,29,30,31. Only sensors and/or shields should be connected to these. All the others a high power grounds that should connect to the engine - B134-8,9,17, B136-17,18. Quote Link to comment Share on other sites More sharing options...
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