TOYOTA 20 VALVE 4AGE ECU CONECTIONS
The AE 101 Series (1991-1995) 20 valve ECU has 3 plugs, designated L (12 pins), M (16 pins) & N (26 pins) if a Manual transmission, or M (16 pins), N (26 pins), & O (22 pins) if Auto. The Plug terminal numbering is based on looking at the plug face and starts at the top left corner (Top is defined as the plug-locking tab). Some wire colours may differ. The following table applies to Manual Transmission only.
Any queries please contact - phil.bradshaw@clear.net.nz
|
Plug and Terminal |
ECU PCB Code |
Wire Colour |
Connected To |
Function |
|
L1 |
+B1 |
B/R |
Battery via EFI fuse and EFI Main Relay |
Power to ECU |
|
L2 |
BATT |
R/W |
Battery via EFI fuse |
Power to ECU memory |
|
L3 |
CCO |
Y/G |
CCO terminal on diagnostics plug and water temp sensor (?) |
|
|
L4 |
Not Used |
|||
|
L5 |
AC2 |
B/Y |
A/C Computer? |
Air Conditioning |
|
L6 |
A/C |
R/Y |
A/C Computer? |
Air Conditioning |
|
L7 |
+B |
B/R |
Battery via EFI fuse and EFI Main Relay |
Power to ECU |
|
L8 |
W |
Y/R |
Ground via Check Engine Light |
Diagnostics |
|
L9 |
EGW |
R |
Ground via Check Engine Light |
Diagnostics |
|
L10 |
AC1 |
Y/B |
Air Conditioning Computer? |
Air Conditioning |
|
L11 |
SPD |
Purple/W |
Ground via Speed Sensor |
Speed Sensor |
|
L12 |
ELS1 |
G/W |
Stop Light Switch connection to lights |
Emissions Control when brakes on |
|
M1 |
THE |
R |
? |
? |
|
M2 |
VS |
Y/W |
Air Flow Meter flap valve variable resistor |
Measures AFM flap opening |
|
M3 |
THA |
Y/B |
Air Flow Meter Inlet Air Temp sensor |
Measures inlet air temperature |
|
M4 |
THW |
W |
Ground via Water Temp Sensor |
Measures engine water jacket temperature |
|
M5 |
TT (?) - Not Used |
B |
T terminal on diagnostics plug |
Diagnostics |
|
M6 |
OX |
B |
OX terminal on diagnostics plug and O2 sensor |
Lambda Sensor |
|
M7 |
TE2 |
G/W |
TE2 terminal on diagnostics plug |
Diagnostics |
|
M8 |
VF |
R/W |
VF terminal on diagnostics plug |
Diagnostics |
|
M9 |
E2 |
Br |
Sensors |
Sensor Ground |
|
M10 |
VTA |
R |
Throttle Position Sensor variable resistor |
Measures throttle position |
|
M11 |
VC |
Y |
AFM and TPS |
Power to AFM and TPS variable resistors |
|
M12 |
IDL |
B |
TPS Idle microswitch |
Signals throttle at idle |
|
M13 |
OXL1 |
R/B |
O2 Sensor |
Lambda Sensor |
|
M14 |
KNK |
Knock Sensor |
Knock Sensor |
|
|
M15 |
TE1 |
BL/W |
TE1 terminal on diagnostics plug |
Diagnostics |
|
M16 |
Not Used |
|||
|
N1 |
ELE2 |
B |
Idle Up (?) |
|
|
N2 |
STA |
B/W |
ST1 terminal on Ignition Switch |
Start Signal |
|
N3 |
IGF |
B/Y |
Igniter |
Igniter |
|
N4 |
NE |
B |
N2 Distributor |
RPM Signal |
|
N5 |
G2 |
G |
G2 Distributor |
|
|
N6 |
Not Used |
|||
|
N7 |
VVT |
Purple/B |
VVT Solenoid |
Cam Advance |
|
N8 |
ISC |
BL/W |
Air Conditioner (?) |
|
|
N9 |
Not Known |
W |
||
|
N10 |
Not Known |
W/G |
||
|
N11 |
#3 |
B/W |
Injector #3 |
Pulse to Injector #3 |
|
N12 |
#1 |
B/Y |
Injector #1 |
Pulse to Injector #1 |
|
N13 |
E01 |
B/R |
Ground |
ECU Ground |
|
N14 |
Not Known |
Pink/B |
||
|
N15 |
Not Used |
|||
|
N16 |
IPV |
BL/W |
VSV (Parge) (?) |
Part of vacuum system under intake |
|
N17 |
G- |
W |
G- on Distributor |
|
|
N18 |
G1 |
R |
G1 on Distributor |
|
|
N19 |
L3 |
G/R |
Idle Up Computer |
|
|
N20 |
L2 |
G/O |
Idle Up Computer |
|
|
N21 |
L1 |
G/W |
Idle Up Computer |
|
|
N22 |
IGT |
B |
Igniter |
Igniter |
|
N23 |
#4 |
B |
Injector #4 |
Pulse to Injector #4 |
|
N24 |
E1 |
Br |
Ground |
ECU Ground |
|
N25 |
#2 |
B/R |
Injector #2 |
Pulse to Injector #2 |
|
N26 |
EO2 |
Br |
Ground |
ECU Ground |
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