Got the car running and driving, and beggining to tune.....
Setting the basics, We ran through the IAC/TPS how to's and have run into a snag. The readings are off from what the manual is claiming we should have, as follows:
factory says 5V feed, closed TPS should be .2 to 1.0, WOT should be 4.0-4.5.
Mine reads 6.65V, closed is .8, WOT 5.73.
How am I getting more than 5V in? Is that not supplied by the ECM?
Setting the basics, We ran through the IAC/TPS how to's and have run into a snag. The readings are off from what the manual is claiming we should have, as follows:
factory says 5V feed, closed TPS should be .2 to 1.0, WOT should be 4.0-4.5.
Mine reads 6.65V, closed is .8, WOT 5.73.
How am I getting more than 5V in? Is that not supplied by the ECM?
Moderator
The +5V reference is generated by the ECM. So either the DVM is bad, the voltage is being measured incorrectly, the ECM is bad, or there is a bad ground(s) in the EFI system
RBob.
RBob.
TunerPro is reading these within the factory limits. Car is running OK, but not good enough.
Now to the VSS. I am trying to figure out how to get the signal from the Caprice wiring (with a VSS buffer) to the 730 ECM, which wants the input directly from the VSS. So, at this point, comparing the schematics of both cars, I am of the opinion that I need to provide the PPL and YEL wires to thier respective pin locations on the ECM. My fear is what that may do to the cruise control in the Caprice, as it appears the VSS is controlled by these wires, and then to the buffer-then to the ECM. Am I way off?
Now to the VSS. I am trying to figure out how to get the signal from the Caprice wiring (with a VSS buffer) to the 730 ECM, which wants the input directly from the VSS. So, at this point, comparing the schematics of both cars, I am of the opinion that I need to provide the PPL and YEL wires to thier respective pin locations on the ECM. My fear is what that may do to the cruise control in the Caprice, as it appears the VSS is controlled by these wires, and then to the buffer-then to the ECM. Am I way off?