Toyota Celica GT Four ECU Pinouts Schematic Guide

The Toyota Celica GT-Four is a high performance model of the Celica liftback, with a turbocharged 3S-GTE engine, and full-time AWD/All Wheel Drive (wikipedia.org). Herein is a schematic guide of Toyota Celica GT Four/GT4 (ST185 Celica) ECU Pinouts that might help you in case you meet electrical control unit problems.

Toyota Celica GT4 ST185 ECU Pinouts Schematic are detailed as follows:

1.  E01/E02    POWER GROUND
2.  No. 1/2/3/4    INJECTOR
3.  STJ  -     COLD START INJECTOR
4.  EGR – EGR VSV
5.  RSC/RSO    ISC VALVE
6.  HT    OXYGEN SENSOR HEATER
7.  IGT    IGNITER 
8.  TPC1      TURBO CHARGING PRESSURE VSV
9.  TVIS      INTAKE AIR VSV
10. FC    CIRCUIT OPENING RELAY

11. IGF    IGNITER
12. G2/G1/NE/G-   DISTRIBUTOR 
13. E1    ENGINE GROUND
14. +B1    MAIN RELAY
15. BATT      BATTERY
16. VF/T/OX1/OX2  CHECK CONNECTOR
17. KNK     KNOCK CONTROL SENSOR
18. PIM     TURBO CHARGING PRESSURE SENSOR
19. THW     WATER TEMP SENSOR
20. IDL/VTA   THROTTLE POSITION SENSOR
21. THA1     AIR TEMP SENSOR
22. VS    AIR FLOW METER
23. VC    SENSOR POWER SOURCE
24. E2    SENSOR GROUND
25. STA    STARTER SWITCH
26. AC1    A/C MAGNET SWITCH
27. ACT    A/C AMPLIFIER
28. SPD    SPEED SENSOR
29. FPR    FUEL PUMP RELAY
30. W    WARNING LIGHT
31. STP    STOP LIGHT SWITCH
32. ELS    TAILLIGHT AND DEFOGGER
33. +B    MAIN RELAY

Complete ECU schematic can be download here.