i am attemting to add another function to my Innovate LM-1. currently i can log the A/F -RPM- TPS. adding the MAP which will be helpfull in tuning the notorious AE. pulled out the Chilton manual and found schematic. of the 3 wires it appears i chose wrong wire. i picked "sensor 1-5 volt- grey". i was able to verify 4 volts at that wire. wired into aux input of LM1.
closed hood. this morn it appears it is drawing continuous current as battery now 9.9 V and when i crank engine does not fire. yot no sparks at MAP nor AUX input harness. low voltage?looks like wrong wire. i will assume i blew a fuse? can anyone determine which wire i should use? not by color but by label. chilton labels each by function. can i assume one of 3 is the ground? help.

 

Three wires should be: 1) 5 volts into sensor 2) Ground 3) Voltage return to ECM, which will vary when load on engine changes. #3 is the one you want to connect to for the aux box.

 

id ign was off all night why would battery drain and engine not start. it cranked OK. fuse blown? only 4 V.

 

Normally the 5 volts to the MAP sensor is not on until the ignition is turned on. If you have voltage on the wire with key off something is not right.
Not sure what fuse you are talking about? But if you indeed did blow one, this would not cause your battery to drain.

Testing for battery drain usually involves connecting an amp meter in series with battery cable and checking how many amps are being drawn with everything off, more than 150 ma usually is too much.

 

i hooked up wrong wire prior evening. ign off and Innovated WB off. next morn i tried to start car. engine cranked (seemed a bit slower) and would not fire. it was not battery drain. the inj do not spray. the FP is not humming with ign on. so checked fuse inj 1 and 2. fine. checked fuse to FP and OK. what else would cause FP not to run? that V flowed to WB adapter and if anything would damage it. however i think 1-4 V is input V anyway to Innovate? so possibly ECU would never see the spike.
coinsidence the FP is not working?.

 

Not real familiar with TBI but you should have a spot on the fuel rail to tap in a fuel pressure gauge to check the pressure. On the TPI tuning key on only runs pump for a couple seconds then it shuts down until engine fires.
You should also have a pin on the ALDL plug where you can make the fuel pump run by using a jumper wire so you can check the pressure using your gauge.
Fuel and spark make fire! If you have both you should at the very least get a bang! May not run, but a bang is a start.
Can't say what would be wrong when it ran O.K. before the WB was connected, try disconnecting the WB entirely and see what happens. Do you get any fault codes from ecm?

 

wil jump ALDL and look for pressure and fuel pump hhhuuummmm tonight.

pump is 2 years old and a GM unit.

the Innovate WM is stand alone and seperate from ECU cept for it receives same data ECU receives.

a couple weeks ago i fried the positive lead from alternator to battery. took 2 years for header to melt away the insulation. destroyed the alternator and the fusable link. ran fine past two weeks?

i have FP gauge attached to my FP regulator. it does not budge. when i jump ALDL i will verify FP on gauge.