AE86 16V Japanese Specification
4A-GE ECU Pin Out Identification
AE 86 (Japanese) 16 Valve 4AGE ECU Connections
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| 4AGE | 1985 AE 86 Sprinter Trueno/Corolla Levin | 4AGE MAP RWD | Toyota part No 89661-12051 | Nippon Denso Part No 175700-0180 |
| Power Supply Source | Wire Color | Connected To |
| 'Run' via EFI Main Relay | Yellow | 4 x main injectors & ECU 'BF' terminal |
| 'Run' | Black/Orange | Power to main injectors via EFI Main Relay, EFI main relay trigger solenoid power, Ignition condenser, ignition coil +ve terminal & igniter |
| 'Run' | Black/Red | TVIS VSV solenoid, ECU 'B' & 'B1', Idle up computer & Circuit Open Relay power feed |
| 'Start' | Black/White | Starter SOLENOID, cold start injector & cold start injector timer |
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| 10 Pin Socket (Looking at ECU socket starting top left) |
| Terminal | PCB Code | Wire Color | Connected To | Function |
| 1 | E01 | Brown | Engine cylinder head earth point | ECU Earth |
| 2 | #10 | Blue | All Four Fuel Injectors | Fuel injector trigger signal |
| 3 | STA | Black/White | Starter Solenoid (from ignition switch 'start' position), cold start injector power feed and cold start injector timer (brown plug temp sensor at rear of head) | Start signal to ECU, cold start injector and cold start injector timer power feed |
| 4* | V max | Not Used | Not Used | Not Used |
| 5* | Not Used | Not Used | Not Used | Not Used |
| 6 | E02 | Brown | Engine cylinder head earth point | ECU Earth |
| 7 | #20 | Blue | All Four Fuel Injectors | Fuel injector trigger signal |
| 8 | IG t | Black/Blue | Igniter Assembly | Ignition timing signal |
| 9 | E 1 | Brown | Engine cylinder head earth point | ECU Earth |
| 10 | BF | Yellow | Power feed from 'Run' position to ECU and main injectors | ECU Power Feed (shared with injectors) |
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| 18 Pin Socket (Looking at ECU socket starting top left) |
| Terminal | PCB Code | Wire Colour | Connected To | Function |
| 1* | Not Used | Not Used | Not Used | Not Used |
| 2* | OX | Black | O2 Sensor | ECU Lambda sensor input |
| 3 | G- | Red | Distributor | 'G' pick up coil signal return to ECU |
| 4 | G1 | Black | Distributor | 'G' pick up coil feed from ECU |
| 5 | IGF | Black/Yellow | Igniter | Ignition confirmation signal |
| 6* | T | Black/Green | ? | ? |
| 7 | THA | Yellow/Black | Intake manifold air temperature sensor | Intake air temperature measurement |
| 8 | PIM | Lt Green/Red | Manifold Air Pressure (MAP) sensor | MAP signal to ECU |
| 9 | THW | Green | Water temperature sensor | Water temperature signal to ECU |
| 10 | VSV 1 | Red/White | TVIS relay | Activate TVIS butterflies |
| 11* | VF | Red/Blue | ? | ? |
| 12 | E 21 | Brown | Joins to ECU 'E2', TPS, MAP, THA & Engine cylinder head earth point | ECU, TPS, MAP, THA Earth |
| 13 | Ne | White | Distributor | Engine speed signal |
| 14* | @ | Not Used | Not Used | Not Used |
| 15 | IDL | Blue | Throttle position sensor | Closed throttle signal |
| 16 | Vcc | Blue/Red | Throttle position & MAP sensor | Constant 5 V DC supply |
| 17 | VTA | Red | Throttle position sensor | Throttle angle signal |
| 18 | E2 | Brown | Joins to ECU 'E21', TPS, MAP, THA & Engine cylinder head earth point | ECU, TPS, MAP, THA Earth |
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| 14 Pin Socket (Looking at ECU socket starting top left) |
| Terminal | PCB Code | Wire Colour | Connected To | Function |
| 1* | @ | Not Used | Not Used | Not Used |
| 2* | @ | Not Used | Not Used | Not Used |
| 3* | @ | Not Used | Not Used | Not Used |
| 4* | Fc | Green/Red | Fuel pump circuit open relay | Keeps fuel pump on when engine is running - acts as a latch to relay |
| 5* | CCO | Light Blue/White | ? | ? |
| 6 | Batt | Red/White | Stop fuse (permanent power) ? | Computer memory? |
| 7 | +B1 | Black(Purple?) /Red | EFI main relay output? | 'Run' power to ECU? |
| 8* | @ | Not Used | Not Used | Not Used |
| 9* | FS | Black/Lt Blue | EFI Main Relay solenoid trigger | EFI Main Relay fail safe trigger |
| 10* | SPD | Black(Purple?)/White | Chassis earth via magnetically triggered speed sensor reed switch | Speed limiter input signal |
| 11* | A/C | Black/White | A/C Amplifier | ECU A/C on detection |
| 12* | EGW | Red | ? | ? |
| 13* | W | Green/Red | Check engine light earth | Trigger for EFI warning/diagnostics |
| 14 | +B | Black(Purple?) /Red? | EFI main relay output? | 'Run' power to ECU? |
Notes: Terminals marked with an asterisk (*) need not be connected in order to run engine, however some emissions and fail safe compromises may be made Tachometer pulse is from black wire connected to Igniter plug (most likely from coil -ve terminal) This information was compiled using AE 86 wiring diagram and engine-ECU loom - 'car' loom was missing. Engine was bench run using all wires except those marked with an asterisk(*). Question marks (?) are 99% certainty. T, VF, CCO and EGW wiring connections/functions unknown but considered unnecessary.
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