Sup guys

I want to confirm if this is correct. (this is how I connected my relay board to MS and sensors)


INJ 1: ground to injector 1
INJ 1: ground to injector 3
INJ 2: ground to injector 2
INJ 2: ground to injector 4
FP: empty
FIDLE: empty
S1: empty
S2: empty
S3: empty
S4: empty
S5: empty
Vref: empty (???)
TPS: wire to throttle position sensor
TPS ret: empty (???)
Tach: to crank position sensor (blue/white) (???)
MAT: wire to GM intake air temp sensor
MAT ret: wire to GM IAT sensor ground
CLT: wire to GM coolant temp sensor
CLT: wire to GM coolant temp sensor ground
O2: connect to a 470ohm to LC-1 WBo2 sensor
Injector +12V: to positive of all injectors


Below are the questions I have:

1)LC-1 WBo2 sensor ground to MS ground wire? or should I wire it to CLT/TPS/MAT return wires? (coz I thought those goes to pin19 sensor ground)

2) Do I need to get the ground wire for TPS also? coz I only tapped the signal wire not the ground wire.

3) Do I connect the IAT to MAT?

4) And is Tach for the crank position sensor wire?

Thanks guys!

Originally posted by gilee_8
1)LC-1 WBo2 sensor ground to MS ground wire? or should I wire it to CLT/TPS/MAT return wires? (coz I thought those goes to pin19 sensor ground)
2) Do I need to get the ground wire for TPS also? coz I only tapped the signal wire not the ground wire.
3) Do I connect the IAT to MAT?
4) And is Tach for the crank position sensor wire? Thanks guys!

1. It helps. You should always be sharing grounds, it reduces noise and increaces accuracy.
2. See #1.
4. Yes.