MembersPage/GrantHendricks/CorollaWiring

For those new to VEMS, the ECIII header on these tables is just the name for the large connectors on the VEMS box. Number in setup refers to the name of the function when using MegaTune.


Power


Power
Wire Color Use number in setup ECIII pin
Black/Red EFI Relay #1 +13.8VBATT 25
Grounds
Wire Color Use number in setup ECIII pin
Brown ground to CLT GND 26
Brown ground to TPS GND 26
Brown ground to IAT GND 26
Brown ground to GND5 close to ECU GND 26
Coax Sheild ground to CAM Triggers GND 26
Black power grounds 2 each to intake GND5 32
Black power grounds to intake GND5 21
Black ground to GND close to ECU GND5 21
Black power grounds 2 each to intake GND5 5
GND and GND5 after tieing together go to intake

TPS

TPS switch
Wire Color Use number in setup ECIII pin
Purple-Gray Wiper TPS pin1
Yellow-Brown PWR TPS5V pin28
Brown common GND pin26
Gray Switch   

Injectors

Injector
Wire Color Injector number in setup ECIII pin
Green Injector power EFI Relay  
Purple-Pink Injector #1 INJA pin7
White Injector #2 INJB pin19
Red-Black Injector #3 INJC pin8
Yellow Injector #4 INJD pin20

Coils setup

The pairs I will use so I can run wasted is
Wire Color Transistor number in setup ECIII pin Cyl
?? Q16 #0 pin35 1,4
?? Q20 #3 pin36 2,3

CLT

Wire Color Use number in setup ECIII pin
Purple CLT CLT 14
Brown Gnd Gnd 26

IAT

Wire Color Use number in setup ECIII pin
Orange-Blue   MAT 2
Brown Gnd Gnd 26

CAM Trigers

CAM Trigers use coex
Wire Color Use number in setup ECIII pin
Ne Black - coax TRIGG1_CONN 27
G2 Green - coax TRIGG2_CONN 13
G- Red wire and White wire (1 in each pair) GND 26
Shield All three shields connected on ECU side only GND 26

WBO

ground the green coex to gnd

WBO
Wire Color Use ECIII18 pin WBO pin
White-Blue PUMP(-) 7 5
Blue PUMP(+) 9 6
(purple) coex NERNST_CELL1 13 1
Red HEATER1(-) 18 4
Green-Yellow Power N/A 3
Power will come from the old wire that went to the NBO

Tachometer

Tachometer
Wire Color Use number in setup ECIII18 pin
Black goes to cluster(tach) STEP_B 10
IS this really a stepper output? The stock tachometer seemed to fire off of the igniter output (once for every signal to the single coil that was sent).

Knock

|||||||| Knock Use coex||u

Wire Color Use number in setup ECIII pin
Blackn KNOCK1   34
Shield Knock gnd   36

Fan

Fan Reley
Wire Color Use ECIII18 pin
?? STEP_C 5

Fuel Pump Power Control

Fuel Pump
Wire Color Use number in setup ECIII pin
Green/Red relay STEP_A small#4

IAC

Need to add a flyback diode between the pins?

Wire Color Use number in setup ECIII pin
Neon-Purple? pin1 will be the IAC control INJG pin6
Orange? pin3 will be the IAC control INJF pin18
Green-Yellow pin2 Switched power N/A N/A

VVT valve

Wire Color Use number in setup ECIII pin
Smurf Blue Signal from ECU (ground) ?? ??
Green-Yellow 12V Switched ?? ??

Check Engine Light

Wire Color Use number in setup ECIII pin
Green/White ?? ?? ??

Charcoal Canister valve

Wire Color Use number in setup ECIII pin
Green-Yellow 12V Switched ?? ??
Purple-Pink =) EVAP ?? ??

EGR valve

Wire Color Use number in setup ECIII pin
?? ?? ?? ??

Serial Port

Wire Color Use number in setup ECIII18 pin
Red RxD? RxD? 14
Brown TxD? TxD? 15

Stepper_b = tachometer

step_c = fan relay

step_a = fuel pump

inj_f = iac

inj_g= iac

CEL = ?

Charcaol canister = Stepper D

VVT = injector E


C BLACK firewall connector

C_plug.gif

NOTE: Pins may have different uses on other trim models/year of AE86. This is specifically for a 1986 US spec "Kouki" GT-S with 4AG-EC (16V with EFI). Generally, auto transmission uses pin 8 for Starter Signal power and leaves 14 blank, Manual transmission uses pin 14 for the same purpose and leaves pin 8 blank.

My car has/had P/S, and A/C. Cars with out one or both will have subtle differences in the wiring. SR5s are different again.

Pins labeled with an "X" are BLANK on my car's connector and are not used, despite the image above!

PIN #ColorFunction
1Yellow/Green Water Temp
2Black/Orange Injector and Coil Power
3Red-BlackBackup Light
4 X X
5BlackIdle-Up
6 X X
7Yellow/Black Oil Pressure Sender
8 X Auto Tranny uses this but not M/T
9Red/Light BlueBackup Light (+12)
10 X X
11WhiteA/C PSI Switch
12Black/WhiteA/C Clutch
13BlackTacho
14Black/WhiteStarter Signal, STA, Cold start/Thermal time switch
15  A/C compressor swtch

Pin 14 is usually used to privides STA signal to 20V OEM ECUs for those not using a standalone. It is recommended to hook this up to the ECU.

ECU info

v3.3

coil #QECIII pinlevel
0Q1635LogicDRIVE_00
1Q2132IGBTDRIVE_01
2Q1534IGBTDRIVE_02
3Q2036LogicDRIVE_03
4Q0611IGBTDRIVE_04
5Q0912LogicDRIVE_05
6Q1224IGBTDRIVE_06
7Q0310LogicDRIVE_07