Originally posted by unisys12:
As for the other thing that I mentioned above... It states in the article that there are two different solenoid assemblies. One with a black connector is a low impedance assembly (1.0-2.0 ohms) and the other is a high impedance (12.5-19.0 ohms) with a beige connector. The resistance can be checked across pins 3 and 4 to check this. Well I have a black connector(on the solenoid assembly) and I check the resistance across pins 3 and 4 and got 20 ohms? It also states in the article that the low impedance assembly should not be used in any CD4E beyond the 95 model year. So now This really confuses the hell out of me because I have a black solenoid body and the resistance measures 1 ohm over what the high impedance should. I should have the high impedance assembly in mine since I have a 98.



unisys12,

You aren't crazy.
You probably still have the original solenoid assembly still in your tranny
after all the work that has been done in it so far.
Replacement solenoids have a BROWN connector, and the replacement solenoids with the BLACK connectors
are limited to use on only 95 years or older,
but the BROWN solenoids can be used on all years.
The reason for the warning is because the PCM used in the 95 is different from the 96+ years.
The PCM in the 96+ years will short out if used with the low impedance solenoid pack.
I wouldn't worry. If that was the case here, you'd have more problems than what you have now.

Looking at my 98 FORD Workshop Manual CD, here's what I found out for you...
It is a lot of info, with some of it replicating what horsedug already stated.

P0743 - TCC - Torque Converter Clutch Solenoid circuit failure during self test.
TCC solenoid circuit fails to provide voltage drop across solenoid.
Circuit shorted or processor drive failure during self-test.
Failed ON - Engine stalls in manual second, engine lugging,
poor performance at low engine speeds, harsh shift.
GO to pinpoint test C.

Transmission Vehicle Harness connector...
Pins labeled pretty much as horsedug said but they are labeled here as follows...

Pin1 - GN/WH TCC Power
Pin2 - BN/RD Signal Return
Pin3 - WH/RD TFT Signal
Pin4 - BK/YE SSA Signal
Pin5 - GN/YE Solenoid Power
Pin6 - BK/BU SSB Signal
Pin7 - BK/WH TCC Signal
Pin8 - BK/RD EPC Signal
Pin9 - GN/OG EPC Power
Pin10 - BK/OG 3-2T/CCS Signal

Manual indicates the need to perform the Solenoid Voltage test via the Rotunda Transmission Tester.
This tool is used to separate the Transmission from the PCM.
This will rule out or prove shorted Solenoid.

Voltage out of PCM needs a scan tool to command Output State Test Mode ON and OFF for TCC Solenoid driver (OTM).
Connect Scan tool to DLC.
Turn KOEO (Key On Engine Off)
Select OTM and PCM will respond ALL ON?
Push START to turn ON, STOP to turn OFF.

While in OTM, turn off key.
Discoonect Transaxle Connector and inspect terminsla for corrosion,
damaged or pushed pins, loose wires, missing or damaged seals.
Turn Key to ON
Connect VOM positive lead to VPWR Pin1 and negative test lead to TCC circuit pin7.
Place VOM on 20V scale.
While observing VOM press START and STOP.
Voltage will change at least 0.5v if PCM Output driver is working.

No voltage means Harness may be shorted.

Then on to testing the TCC Solenoid.
Test Procedure states that if resistance of TCC Solenoid is NOT between 12.5 and 19 ohms, replace solenoid body assembly.
Your 20 ohms may be just enough out of range to produce the CEL.
Under the DVOM, it looks okay, but under VPWR, it may short out.

Under the Diagnose by Symptom chart it indicates Inspect and/or
repair damaged or misaligned transmission range sensor.

Also conduct TCC Operation test...
Drive vehicle at highway for approx 15 minutes to bring to operating temperature.
Maintain constant 50 mph and tap brake with left foot.
Engine RPM should increase and then decrease after 5 seconds.
If this doesn't occur refer to Torque Converter Operation concerns.

If vehicle is at a stop and stalls in D, mover transaxle range selector to Manual 1.
If vehicle doesn't stalll at stop in Manual 1 refer to Toque Converter Diagnosis by Symptoms.

Basically, if you got this far, you may need a new Torque Converter...

Pete...

Pete... 2004 Mercury Marauder 300A Black Clearcoat/Dark Charcoal LEATHER DOB 10/31/2003 DOP 1/2/2004 www.mercurymarauder.net