With the TBS disconnected do you think the engine rpm wouild stay at idle or hunt and surge?

Thanks.

Mark

 

TBS?

If you mean TPS then I believe the PCM will throw codes, use a default value, run rich and risk destroying your cats if you do it for long. But at leaat it should get you home rather than refuse to run.

 

I think you get a limp mode with No TPS since it cant find the butterfly position.

 

That's really poor, isn't it? It can get very close to correct engine control from MAF, trimmed by O2s, using MAP, and being careful to use KSs. At least, I think it can.

 

Sorry, yes I did mean TPS .

That is what I thought, cannot line up with the throttle so throw the limp mode.

So what would cause the hunting and surging? I will try to pull codes tonight.

Thanks

 

Once the ECU isn't in control anymore over the TB, it will indeed go into limp mode, and then control the engine rpm via the fuel injectors. In idle position the TB will let in too much air, and the only way to keep the rpm low is then to limit fuel injection. This causes the hunt/surging, so normal operation.

 

Oh! How horrible!!

I am now working on the basis that this is with BOTH the TPS and the throttle body's motor (i.e. butterfly actuator) disconnected. I'd thought just the former was meant.

I'm a little surprised that when the actuator is disconnected the throttle butterfly is part (or fully) open, but the car would go nowhere due to having no air otherwise, so again I suppose it must be this way.

Thanks for explaining.

 

I ordered a new TPS from USAUTOPARTS.NET (part number W0133-1655464 $175.00 with free shipping) which arrived a day later.

Downside; it was a used part that arrived. It seems someone in the warehouse decided to swap the part out before it shipped. Thankfully, one phone call later, another one was dispatched.

That one arrived this afternoon and was promptly fitted this evening. 1 cable connector, 2 screws, five minutes of time and all was completed.

She runs like a dream again

 

Seems I spoke too soon. Dreaded Failsafe came on and then the mil. TPS Sensor again. Apart from the accelerator pedal can anyone offer a suggestion?

Mark

 

What DTC is in the Module????

bob gauff

 

Bob,
Sorry about that. My mind was elsewhere!

The DTC is P1584 Throttle Control Unit Input Circuit Malfunction.
Thanks.

Mark

 

That doesn't look to be the Jaguar details for that code. Get them from JTIS (may also be in the FAQs and/or Gus's site). You want to be looking at the right info!

 

OK it seems I was wrong about P1584 Bring the Throttle Control Unit Input Circuit Malfunction.

P1584 is actually TCU Detected IPE Circuit Malfunction. Can anyone decipher this for me please?

Mark

 

You need the code from the way I told you. Really. Do yourself a favour and get it that way.

BTW, you need JTIS no matter what if you're going to do even the slightest amount of DIY.

 

Here is the Jaguar DTC summary for your car.

bob gauff

 

Bob,

Thanks mate. Your help is appreciated

Mark

 

Same file I said to get and consult, just saved you the seconds to go do it.

 

Hello
Here is the link to the free JTIS21 Download and instructions on the forum:

New JTIS21 CD download with download instructions

Jim Lombardi