Picking your brain on a Ford EEC-IV Brake on/off 536 code

[subford]

Originally Posted by TT_Vert

OK that tells me it's a valid test for our vehicles. Any chance you could peek under your dash by your feet and tell me the 4 digit code in big bold letters on the ECU? I assume you meant code 632 not 532 for the last one? At what point were you pushing on the brake pedal? Right after engine ID code? Did you press the brake before or after the OD switch (Not that that should even matter).

You have a gasoline 460 right?

Thanks
Dave

I push the brake at the ID code and then push the OD switch.
Yes it is a 460 gas engine.
PCM PROGRAM CODE - - - - TOE0 Part # F4TF-12A650-AMA.

[TT_Vert]

Originally Posted by subford

I push the brake at the ID code and then push the OD switch.
Yes it is a 460 gas engine.
PCM PROGRAM CODE - - - - TOE0 Part # F4TF-12A650-AMA.

Huh, I have TOE1 (F4TF-12A650-AMB), i wonder if there is some difference w/ that test in my calibration. Can't see why there would be though. One last question, "at the ID code", do you mean during or immediately after? I've found little to no info on these PCM calibrations. All I know is twEECer can write to them.

Thanks for all the help/info to this point, it's been invaluable. I've been doing lots of searching and many of the diagrams I've used to go through all systems have been yours.
Dave

[subford]

Originally Posted by TT_Vert

Huh, I have TOE1 (F4TF-12A650-AMB), i wonder if there is some difference w/ that test in my calibration.

Yours is a 1995 and my F53 is 1994 but there should be no difference for the BOO switch to the PCM self-test.

Originally Posted by TT_Vert

One last question, "at the ID code", do you mean during or immediately after?

As soon as it comes on and that would be during.

[TT_Vert]

Originally Posted by subford

Yours is a 1995 and my F53 is 1994 but there should be no difference for the BOO switch to the PCM self-test.

As soon as it comes on and that would be during.

My chassis is actually a 94. RV is a 95. I did find a video where the person actually performed the BOO and OD switch activation AFTER the goose test signal. I was doing both right after the engine ID flashes. Just tried that and still get 536 :(

Dave

[subford]

I would guess that your PCM has been replaced with a PCM from a F-series truck.
Others on this forum with a 94 RV have stated they have the same one as I have.


The trucks do run a different program than the F53 RV.
But I do not see where that would cause your problem.
That said you may have PCM with some problems.

[TT_Vert]

It's quite possible they have multiple calibrations for the same chassis. Especially between model years mine could have been a late model year and yours could have been early model year. The computer is definitely for and an F53. There could be something wrong with it but given everything else works fine I highly doubt it. With that said I'm just going to leave it for now.

Dave

[mpaton]

Originally Posted by TT_Vert

Well i do know for a fact the wire to the ECM is good given I checked continuity from the brake switch to pin 2 of the ECM. Not sure what using the brake to disengage the (TCC) converter lockup will tell me.

Dave

My thought was that my test would tell you whether the software in the PCM was aware of changes in the state of the BOO switch. So you've tested continuity to the pin in the connector, this shows that the input is acted on. Or not.

[TT_Vert]

Originally Posted by mpaton

My thought was that my test would tell you whether the software in the PCM was aware of changes in the state of the BOO switch. So you've tested continuity to the pin in the connector, this shows that the input is acted on. Or not.

Yeah I suppose I can see. I'm surprised it'd actually take it out of OD when you lightly get on the brake.

[mpaton]

Originally Posted by TT_Vert

Yeah I suppose I can see. I'm surprised it'd actually take it out of OD when you lightly get on the brake.

It doesn't. I said it unlocks the torque converter clutch, a different thing. Presumably to make doubly sure it doesn't stall the engine when you come to a stop.


And the TOE1 is a very minor tweak to the TOE0, in line with one of Ford's several calibration naming schemes.

[TT_Vert]

Originally Posted by mpaton

It doesn't. I said it unlocks the torque converter clutch, a different thing. Presumably to make doubly sure it doesn't stall the engine when you come to a stop.


And the TOE1 is a very minor tweak to the TOE0, in line with one of Ford's several calibration naming schemes.

Ahh ok. I thought it may use the IAC to idle up. I was always under the impression the TCC solenoid and OD solenoid were one in the same.. I wonder what all they changed TOE0 to TOE1, there has to be some database somewhere w/ a history of changes.. Still scratching my head on this one as everything checks out and the ECU HAS to be seeing 12V when I depress the brake pedal.

Dave

[subford]

Not sure what you are calling the OD solenoid.

/

[TT_Vert]

Originally Posted by subford

Not sure what you are calling the OD solenoid.

/

What i was getting at was the TCC clutches purpose is to disengage the converter lockup which I thought would "take it out of OD". I believed (Perhaps errantly) disabling OD just disabled the TCC to allow slippage of torque convertor but some more reading indicates this may be incorrect and it actually keeps it out of 4th (.71:1). The E4OD only has 4 forward gears but perhaps for this setup taking it out of OD moves it to 3rd (1:1) rather than just allowing slippage. I'm not much of an auto trans guy so not sure here.

Dave

[subford]

I quote Mark Kovalsky.
Former Ford Automatic Transmission Engineer 1988 - 2007


"When you press the button on the end of the shifter and the OD OFF light is on the transmission won't shift to fourth gear. Torque converter lockup can happen in third gear and fourth gear, and in some limited amounts in first and second gears, too."

[TT_Vert]

Originally Posted by subford

I quote Mark Kovalsky.
Former Ford Automatic Transmission Engineer 1988 - 2007


"When you press the button on the end of the shifter and the OD OFF light is on the transmission won't shift to fourth gear. Torque converter lockup can happen in third gear and fourth gear, and in some limited amounts in first and second gears, too."

Great info, thanks. Where do you find all of this info?

Dave