VSS help
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VSS help
I swapped out the body of my wrecked 1999 expedition to the body of a not so wrecked 1997 expedition. The VSS on the transmissions are different. How do I make the wire harnesses from the 1997 match the 1999 so the computer accepts it. I tried switching the harnesses from the 1999 drive train with the 1997 but the VSS is different. In short the 1999 has more wires. Does anybody know how to mirror these two together or do I to buy a trans control system?
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Joined: Jan 2001
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From: Central NYS
How many wires and what color are on the 1997 body's connector?
And how many and what color are the wires on the 1999 body's connector?
Did the donor 1997 body have the same engine, same transmission, and the same drive train (4X4 or 4X2) as your original 1999 Body?
Ford didn't use the term VSS (Variable Speed Sensor) on the Expy's.
They did use an OSS (Output Shaft Speed) sensor on the 4R70 transmission and both an OSS and a TSS (Turbine Shaft Speed) sensor on the 4R100 transmission.
I'm only guessing that your two bodys originally had different transmissions. Which PCM are you using - the one from the 1997 or the one from the 1999?
And how many and what color are the wires on the 1999 body's connector?
Did the donor 1997 body have the same engine, same transmission, and the same drive train (4X4 or 4X2) as your original 1999 Body?
Ford didn't use the term VSS (Variable Speed Sensor) on the Expy's.
They did use an OSS (Output Shaft Speed) sensor on the 4R70 transmission and both an OSS and a TSS (Turbine Shaft Speed) sensor on the 4R100 transmission.
I'm only guessing that your two bodys originally had different transmissions. Which PCM are you using - the one from the 1997 or the one from the 1999?
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The 97 has 24 wires and the 99 has 26 wires. Most match up. I found 5 differences between the pins. pin #3 on the 97 is a red wire and on the 99 it is a vt/wh. pin # 19 on the 97 is pk/o and it is empty on the 99. pin #20 on the 97 is gy/bk it is empty on the 99. pin 23 is empty on the 97 and it has a pk/bk on the 99. pin 24 is empty on the 97 but on the 99 it has a dg/w wire (none match up any where). The 97 had the E40D and the 99 is the 4R100 (both 4x4's). The PCM is from the 97
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From: Central NYS
Assuming you are using the 4R100 tranny from your 1999 body, the 1999 PCM will be looking for an OSS (Output Shaft Signal) AND a TSS (Turbine Shaft Signal) to control a 4R100 tranny and doesn't need a VSS signal to do that.
The extra two wires are probably the wires for the TSS (which the '97 PCM wouldn't know what to do with them).
I found 5 differences between the pins. pin #3 on the 97 is a red wire and on the 99 it is a vt/wh. pin # 19 on the 97 is pk/o and it is empty on the 99. pin #20 on the 97 is gy/bk it is empty on the 99. pin 23 is empty on the 97 and it has a pk/bk on the 99. pin 24 is empty on the 97 but on the 99 it has a dg/w wire (none match up any where). The 97 had the E40D and the 99 is the 4R100 (both 4x4's). The PCM is from the 97
Pin #19 & 20 is for the VSS signal used by the '97 PCM and is not available in the 4R100.
Pin #23 & 24 is for the TSS signal used by a '99 PCM in the 4R100 application but not available in the E4OD application.
BTW, for 1997 Pin #4 was for E4OD only, and Pins 8 & 9 was only for the 4R70W.
Looks to me like you really need to have a compatible combination of PCM/harness/transmission/engine. You are asking questions that are way above my pay grade!
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