P1714 and P1715

[Lechuga]

My Explorer is (apparently) an early 98 with the V6 SOHC engine and the OSS in the TC, which was broken and disconnected (I used to get a P0720 DTC). I bought a replaced the broken OSS and connected it. The result is the P0720 is now gone, but it now shifts really late (around 5000-6000rpm) sometimes even hitting the rev limiter regardless how soft I drive on flat ground. Also I got two new error codes (P1714 and P1715), which disappear if I disconnect the OSS.

Disconnecting the OSS causes the P0720 back and shifting is more or less back to normal (the way it used to before).

I am hoping someone will suggest an easy fix. Because so far, nothing has been easy with this Ex and I don't particularly fancy another ATF bath (but I will do it if necessary).

So far in the last 5000 miles, I've done a full tune up, replaced the transmission VB gaskets and transmission oil filter, full oil change (engine, TC, front and rear diffs).

My gut feeling is wiring, but where to look... Any input will be much appreciated. TIA
Chris

 

[jremington59]

P1714 is for a SS1 (shfit solenoid 1) mechanical failure.

 

[Lechuga]

I'll add some for details:

1. All (fwd and reverse) gears work regardless with or without the OSS connected. It's just that without the OSS if doesn't downshift on kickdown and struggles uphill (shuddering). With the OSS, it downshifts on kickdown instantly but takes coaxing to get into the next gear.

2. With the OSS connected, I get two new DTCs (P1714 and P1715). Disconnect the OSS and these disappear. Nevertheless, DTC P1714 would suggest failure to engage reverse, which is not the case. In fact reverse engages much more smoothly with the OSS connected.

3. I do all my electrical work with the battery disconnected, so that effectively resets the PCM.

4. When shifting from 1st to 2nd, 3rd to 4th, 4th to OD, RPM drop about 600rpm; however 2nd to 3rd is about 1100rpm drop. Is this normal?

5. I'm currently reading all I've got and can find here on the solenoids and electrics, got the transmission wiring diagrams. My plan is to get under the car this afternoon and start snooping around for a short-circuit with all related visible wires and connectors.

 

[Lechuga]

Help please?

 

[Lechuga]

UPDATE: The P1714 has disappeared and a new DTC is raised (P1716). I feel like I'm shooting a moving target. I live in Spain and there aren't any other Ex to compare with. I rely heavily on you US guys for comparison and experience. If someone can shed some light on this, please

I've tested the TPS and found it to be spot on as well as the MAF, spark plugs are new, ignition leads are also ok, fixed the intake air leak, cleaned the IAC, replaced the EGC valve, replaced transmission gaskets, ATF oil and filter change, O2 sensors

 

[budwich]

"sounds" to me like it is "complaining" about weak solenoids.

 

[Lechuga]

"sounds" to me like it is "complaining" about weak solenoids.

Thanks. I sincerely appreciate your feedback. If this was the case, then why would these DTC not appear if the OSS is disconnected? Would replacing the solenoids fix the high rpm shift points? I'm not affraid of buying new solenoids if I have to, but I don't want to buy more parts without being absolutely certain it will fix things. It's not so much the part but the shipping costs (which tend to double the cost of the part itself). TIA

 

[budwich]

that is just my guess based on no experience... just the "interpretation" of the codes. My guess on the reason for the operational differences is that your tranny is running in "different modes" because the PCM can't get any speed info in one case. Again just a guess. I agree about parts buying so hopefully someone else will add or take accordingly.

I do believe there are some "bench tests" for the solenoids which might help you determine directions... especially if you can compare them with others plus "known values". That would be my strategy... maybe.

 

[Lechuga]

Yes, I read the Tranny VB Rebuild diary and saw how to test the solenoids but I am hoping I could do that without having to drop the pan and ATF bath (which I just did less than 3000 miles ago). Does someone have the pinout on the tranny electrical connector? That would help

 

[Lechuga]

I will drop the pan and check the internal wiring and solenoids. If any solenoids are bad, I think I will go for a remanufactured VB

 

[Lechuga]

LATE UPDATE: I replaced the VB for a reman... Error codes are gone. But it still shifts late at above 5000rpm and for the life of me, can't figure out why. Any ideas, please?