Early 4L80E connector
1993 up 4L80E connector
4L60E connector
Trans controller wiring Microsquirt
(C) James Murray Oct 2007, 2008, 2009
The Microsquirt already contains most of the required electronics to support the transmission and only a few external 'mods' are required.
|
Microsquirt pin number |
Signal name |
Function |
|---|---|---|
|
33 |
VR- |
VSS negative (rear /side of trans or transfer case) |
|
32 |
VR+ |
VSS positive (rear /side of trans or transfer case) |
|
8 |
FP |
Solenoid A |
|
7 |
IDL |
Solenoid B |
|
11 |
IGNOUT2 |
3-2 Solenoid (4L60E only) |
|
9 |
INJ1 |
TCC solenoid (LU) |
|
10 |
INJ2 |
EPC solenoid |
|
26 |
MAT |
TPT pin A |
|
25 |
CLT |
TPT pin B |
|
34 |
EGO |
TPT pin C |
|
19 |
GND |
Trans temp sensor ground |
|
24 |
MAP |
Trans temp sensor |
|
28 |
VREF |
Connect 2.49k resistor to pin 34. Connect 2.49k resistor to pin 24 (should be ok for GM trans) Connect 2.49k resistor to pin 29 (adjust for different sensor in engine and omit if sharing sensor) If standalone TPS is used, connect to TPS. DO NOT CONNECT if sharing TPS with another ECU. |
|
27 |
TPS |
TPS signal “middle wire” (0-5v input) |
|
18 |
GND |
If standalone TPS is used, connect to TPS. DO NOT CONNECT if sharing TPS with another ECU. |
|
29 |
SPAREADC |
Engine temp sensor. |
|
21,22,23 |
GND |
Connect to a good ground location |
|
1 |
+12V |
Connect to a fused 12v supply live when ignition is on |
|
6 |
FLEX |
Brake switch signal. Use a relay to connect this to ground when brake pedal is pressed. DO NOT apply 12v to this pin. |
|
16 |
VR2IN+ |
Engine speed signal. Connect to tacho or crank sensor |
|
13,14,20 |
RXOUT,TXOUT, GND |
Serial connection to computer. |
|
2,3 |
CANH,CANL |
Optional, connect to MS2 CAN network to fetch RPM, TPS and engine temp from the main ECU. If not using CAN you can leave these disconnected, but tape the wires to avoid accidental shorts. |
|
16,17,35,12 |
ALED,WLED,TACHOUT,IGN |
Not used at this time. Do not connect. Maybe switched outputs in the future. |
|
30,31 |
OPTOIN+,OPTOIN- |
Do not connect. |
|
15 |
BOOTLOAD |
Required during initial setup. Connect to ground to load code. NEVER apply a voltage to this pin or damage will occur. |
It should be possible to use an MS2 card as an alternative, but it will be a little more involved. Send me an email if interested.
The following diagrams and pinout lists were taken from the yahoo Megashift group and corrected from service data. The 4L80E for sure is looking into the transmission, so the plug is reversed.
|
|
|
|
|
Early 4L80E connector |
1993 up 4L80E connector |
4L60E connector |
|
Function |
Microsquirt pin |
Early 4L80E |
Late 4L80E |
4L60E |
|
Sol A Switched Gnd |
8 |
A |
A (Light Green) |
A |
|
Sol B Switched Gnd |
7 |
B |
B ( Yellow/Black) |
B |
|
+12 Power |
fused 12v |
C & K |
E (Pink/Black) |
E |
|
Press Sw A (Pin A) |
26 |
D |
N (Pink) |
N |
|
Press Sw B (Pin B) |
25 |
E |
R (Blue) |
R |
|
Press Sw C (Pin C) |
34 |
F |
P (Red) |
P |
|
Temp Sensor GND |
19 |
H |
M (Purple) |
M |
|
Temp Sensor |
24 |
G |
L (Black/Yellow) |
L |
|
LU Sol Switched Gnd |
9 |
J |
S (Brown/Black) |
T |
|
EPC +12V |
fused 12v |
L |
C (Red/Black) |
C |
|
EPC Switched Gnd |
10 |
M |
D (Grey/White) |
D |
|
3-2 solenoid switched Gnd |
11 |
n/a |
n/a |
S |
|
Lock up feel solenoid switched Gnd (Cadillac only?) |
n/a |
n/a |
n/a |
U |
Note, the transmission requires a fused 12V supply. Suggest one 10A fuse to supply both +12V and EPC. The 4L60E may require a 15A fuse due to the additional solenoid.
The Microsquirt also requires its own fused supply 1-5A fuse preferred.
Last updated: 7th February 2009
Email: jsm@jsm-net.demon.co.uk