ECU Code 46 Secondary TPS - No CEL

[OwnerCS]

As part of a routine ECU Talk check, ECU Code 46 for the Secondary TPS appeared. I cannot clear the code so this might be a real malfunction. The TPS reading on the ECU Talk hand held shows 0.42V.

FSM section EF & EC page 117.

No CEL code is appearing. It seems to drive ok.. What type of symptoms should I be experiencing? I've seen some posts about sluggish take off.

Just as another check, I unplugged the gray three connector plug and the RPM jumped up to 975 and it seems to be more responsive. Yet still no CEL even with it unplugged. I didn't drive it with the TPS unplugged..

[Infinitiguy19]

You have Traction Control (System) and their is a problem with the secondary Throttle Position Sensor. There are two throttle on TCS cars one is mechanically controlled (Your foot) and the other is electronically controlled (By a Control Unit).

[OwnerCS]

You have Traction Control (System) and their is a problem with the secondary Throttle Position Sensor. There are two throttle on TCS cars one is mechanically controlled (Your foot) and the other is electronically controlled (By a Control Unit).

It is just a base model.. If that is a code normally seen on a TCS model, now I scratching my head..

I found a picture of the TPS from the bottom of the plenum.

[Infinitiguy19]

Do you have a TCS ECU (Engine Control Unit) installed? Whats the part number on the ECU (ECU Talk should be able to read that).

[OwnerCS]

I've got a NICO ECU.. Wes might know the model number.. I'll need to get the laptop going tomorrow evening to get the model number.

[elwesso]

Yeah we always program the Ecu with the TCS programs, so if your car doesn't have TCS it will throw that code. Completely harmless and no CEL shows so 95% of the population never notices.

We used to ask customers what their car was and progam them special, now we try and have a bunch ready for shorter delivery times, so it's kind of a trade off for everyone.

[OwnerCS]

Thanks Wes.. Does the new (step up) 4 mode model come with stock settings?

Craig

[Brew Q]

How funny - I plugged in ECU Talk and found the same code and this thread

I have an older Nico stage 2, so good to know it's just the ecu and nothing to report.

[Turbon8er]

i'm having crazy issues that i though were fuel pump related, but after pulling the code last night (by ECU led flash), 46 is the only one being displayed. I got on here to report that in the stalling/dying thread.. and saw this.

you're not having any differences whatsoever in performance though?

[OwnerCS]

If you have a NICO ECU, and your car does not have TCS, code 46 is fine. I think the ECU is setup to support both TCS and non-TCS models. I just ignore code 46 using the ECUTalk code reader.

[Turbon8er]

I have a stock ECU and TCS equipped. So would it make the throttle response/idle act erratically then?

[OwnerCS]

Nate - Man I wish I had some experience with a TCS model. My 91 is just a base. The video from the other thread sure looks like it is starving for fuel. I think Goody, Heath, and Wes will be able to provide more information. I have a spare FPCU and new fuel pump that I keep on hand for eventual replacement. Thankfully, I've not had any fuel issues with mine to gain experience.