2001 Mercury Sable P1779, P1000, Speedometer, Tachometer

Tiny
JWALK
  • MEMBER
  • 2001 MERCURY SABLE
  • 3.0L
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 178,000 MILES
With this cold weather I have been having some issues. When the temperature outside dropped to near 0°F I had a check transaxle light illuminate on my dashboard. The specific engine code reads P1779. I have done some research and found that it could mean a variety of things. I have listed them below. However, I believe this is an electrical issue as I have not had any hard shifting or signs of errors in the transmission. My gas mileage continues to be normal. I checked the transmission fluid level and it is full. This code has been on since 1/11/14. Just recently, my speedometer and tachometer stop working until the engine stays warms for about 15 minutes and heats the cabin. I have driven the car with no heat on in the interior and the gages stay off. During this time the check transaxle light and the code P1779 do not illuminate or read when I check the engine codes. With these issues I purchased a code reader and I also found that there is a P1000 code. This P1000 code continues to read even when the P1779 code does not. With this same code reader (iPhone app DashCommander) I can still rerad RPM and speed when the gages are not working. This further leads me to think it is an electrical issue.

Any help with this issue would be much appreciated.

P1779 Defined:
1. Transmission control indicator light circuit
2. Engine Torque Delivered To TCM Signal
3. Solenoids in transmission could be malfunctioning
4. Low transmission fluid

P1000 Defined:
1. OBD system readiness test not complete

Transmission History:
Transmission fluid and filter have been changed aproximatly every 30,000 miles
Timeline of events:
1/11/14 Check transaxle light illuminates
1/25/14 Speedometer, tachometer, and check transaxle light stop working until car warms up
1/27/14 P1000 code found

Car information:
2001 Mercury Sable LS
179,000 miles
Engine is regular 3.0L (not DOHC)
Transmission type is AX4S
Oil changed every 5-7k miles
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Tuesday, February 4th, 2014 AT 9:11 AM

7 Replies

Tiny
MLDANIELS2000
  • EXPERT
Common issue for Sables and Taurus are the connector going into the top of the transmission gets water intrusion. Pull the plug (can be seen under master cylinder) and check for green or white corrosion. Clean with contact cleaner and re-install plug with dielectric grease. P1000 codes is just a code Ford uses whenever codes are cleared and all the diagnostic monitors the PCM must perform are not completed. It will clear this code on its on after all its internal diagnostic drive cycles are completed. Just run it for 30 minutes with all kinds of driving scenarios like highway, stop and go, normal back road.
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+1
Tuesday, February 4th, 2014 AT 9:36 AM
Tiny
JWALK
  • MEMBER
I checked the vehicle speed sensor (VSS) that you were referring to. Still no luck, it is in proper functioning order, I have verified this via the live feed of the PID as well as physical examination. Any other ideas? I believe it is in the instrument cluster or the wiring/connectors going there.
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Friday, February 7th, 2014 AT 11:47 AM
Tiny
MLDANIELS2000
  • EXPERT
The connector I am referring to has like 8 to 12 wires in it. It is the whole control harness for the transmission usually somewhere on the top of the transaxle.
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Friday, February 7th, 2014 AT 8:00 PM
Tiny
MLDANIELS2000
  • EXPERT
You are probably correct. Pull the instrument cluster and check the bulbs in the cluster. Transaxle light prob burned out.
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Friday, February 7th, 2014 AT 8:03 PM
Tiny
MLDANIELS2000
  • EXPERT
Check all connectors to see if the are properly seated to back on cluster.
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Friday, February 7th, 2014 AT 8:04 PM
Tiny
JWALK
  • MEMBER
SOLVED:

I found the issue. It was the connectors on the back of the instrument panel. There were two instances of them touching their adjacent connector.

Hope this helps someone else!
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Wednesday, February 26th, 2014 AT 12:11 PM
Tiny
MLDANIELS2000
  • EXPERT
Awesome job.
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Monday, March 3rd, 2014 AT 7:44 PM

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