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| My 4.9 wiring thread (Page 14/16) |
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gen2muchwork
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JAN 11, 11:36 AM
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sometimes I need a diagram.
Is this how you normally power things phonedawgs?
I used reallybigs sheet to make this terrible drawing in paint 
I'm using a 95 harness with an early computer and trans so the trans is a little different, but that is irrellivant for this discussion I think.
 [This message has been edited by gen2muchwork (edited 01-11-2013).]
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lou_dias
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JAN 11, 04:20 PM
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| quote | Originally posted by phonedawgz:
Something is seriously wrong with that. Chassis ground SHOULD be the same as ECM ground. If swapping from one to the other causes significant differences, you have a grounding problem.
Are you talking about scanning the ECM and reading the temp sensor, or are you talking about the reading on the gauge?
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As you can see here, the TPS and coolant sensor share a 5v ref ground.
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gen2muchwork
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JAN 15, 12:13 PM
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thanks for the help everyone. I think I was succesful so far.
did you get that temp gauge figured out lou?
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lou_dias
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JAN 15, 12:56 PM
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I swapped the temp gauge wire and CTS signal wire and the gauge reported ~160 while the CTS reported about 73C so it looks like that's all set.
However my TPS still says 1.18v /60% thottle at idle at that temp. WOT sees it go to 4.88v.
I jumped on the ground from the MAP sensor since that's also supposed to be a 5v ref ground. For some reason Pin F11 is an open pin on my ECM. The pin is there but it acts open.
All readings were taken using TunerPro RT with the '2240 .ads file converted to .adx...
Looking at the page I linked 2 posts ago, the TPS signal goes to B4 before it goes to F13. What is meant by B4 here? I'm thinking B4 steps it down to the proper range at this point. Right now I take the TPS signal and it's going straight to F13...[This message has been edited by lou_dias (edited 01-15-2013).]
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phonedawgz
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JAN 15, 02:03 PM
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B4 is the pin of the bulkhead connector used in the Caddy. It does nothing electrically.
| quote | | I jumped on the ground from the MAP sensor since that's also supposed to be a 5v ref ground. For some reason Pin F11 is an open pin on my ECM. The pin is there but it acts open. |
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Doesn't the print say E11, not F11?[This message has been edited by phonedawgz (edited 01-15-2013).]
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SERGE144
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JAN 15, 02:07 PM
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I think B4 is the big rectangle bulkhead connector.
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gen2muchwork
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JAN 15, 02:18 PM
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| quote | Originally posted by lou_dias:
I swapped the temp gauge wire and CTS signal wire and the gauge reported ~160 while the CTS reported about 73C so it looks like that's all set.
However my TPS still says 1.18v /60% thottle at idle at that temp. WOT sees it go to 4.88v.
I jumped on the ground from the MAP sensor since that's also supposed to be a 5v ref ground. For some reason Pin F11 is an open pin on my ECM. The pin is there but it acts open.
All readings were taken using TunerPro RT with the '2240 .ads file converted to .adx...
Looking at the page I linked 2 posts ago, the TPS signal goes to B4 before it goes to F13. What is meant by B4 here? I'm thinking B4 steps it down to the proper range at this point. Right now I take the TPS signal and it's going straight to F13...
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are you using c225 or whatever the big connector is? I cut it out like many people have. The B4 is just a pin in a connector. the connector is the box around B4 and is refefenced on the print as a star.
If you are not using that connector, cross it out on your copy so you dont have to get confused looking at it. It helped me to just sharpie it out.[This message has been edited by gen2muchwork (edited 01-15-2013).]
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gen2muchwork
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JAN 15, 02:20 PM
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| quote | Originally posted by phonedawgz:
Doesn't the print say E11, not F11?
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yes it does
I have found a few of those when doing this that did not copy well for me too, and I almost mixed them up as well.
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lou_dias
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JAN 15, 03:47 PM
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| quote | Originally posted by gen2muchwork:
yes it does
I have found a few of those when doing this that did not copy well for me too, and I almost mixed them up as well.
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I had the wire there from the harness supplied by the Fiero Factory. I'm on the connector side and the 11th pin. I looked at all the other wires used and everything matches up...unless the schematic is wrong. Regardless I tied it to the MAT ground wire which should go to another 5v ref ground.
I am wondering if that bulkhead connector had some built-in resistance that knocked down the the voltage... Again, I'm using the Fiero Factory harness...
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gen2muchwork
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JAN 15, 06:05 PM
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| quote | Originally posted by lou_dias:
I had the wire there from the harness supplied by the Fiero Factory. I'm on the connector side and the 11th pin. I looked at all the other wires used and everything matches up...unless the schematic is wrong. Regardless I tied it to the MAT ground wire which should go to another 5v ref ground.
I am wondering if that bulkhead connector had some built-in resistance that knocked down the the voltage... Again, I'm using the Fiero Factory harness... |
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The only built in resistance is corrosion. Take a look at the schematic. There are two 5v returns. Tps goes with cts. Map and mat.
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