AE86 16V Japanese Specification 

 4A-GE ECU Pin Out Identification

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AE 86 (Japanese) 16 Valve 4AGE ECU Connections

AE86 Japan ECUa.jpg (151860 bytes)AE86 Japan ECUb.jpg (47819 bytes) AE86_Japan_ECU ignition.jpg (82781 bytes)

Freedom 16V and 20V ECU.jpg (51566 bytes)

ECU Japan AE86 1984-85.jpg (24523 bytes)

ECU Japan AE86 1986-87.jpg (31392 bytes)

 

 
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

 
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)

 
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

 
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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