Trouble shooting TPS code 41 & 47

[Kristian_Wraae]

I have a Supra MKIII with a 2JZ-GTE engine. I just finished adding a hydrofan setup from a JZA70.

 

It involves some wiring. Somehow I have swapped +12 and 0V on the hydrofan computer. So it might be toast. But I have another one.

 

However my problem is that I now run in limp mode and the error codes are 41, 47, 77 and 89.

 

When I discoved my mistake I unplugged the hydrofan computer and fixed the wires. Then I tried a new ECU.

 

Until this point I had only 41 as code. Then 77 and 89 appeared with the new ECU. Swapping back to the old one didn't fix that.

 

So I tried to plug in the throttle body TPS plug into the sub-throttle body TPS and the 41 code went away and a 47 code appeared from the missing sensor (left the plug for the sub throttle unplugged).

 

Then I swaped back and now I have both 41 and 47 codes as well as the 77 and 89.

 

I have measured both TPSs and they both have infinite resistance between VTA and E2 (that should not be the case). The throttle body TPS has also infinite resistance between VCC and E2 but the sub throttle body TPS has normal resistance between VCC and E2.

 

When I look at the trouble shooting section in the TSRM it states that unplugging the TPS should not result in error codes. I find that hard to belive.

 

Can anyone confirm that the error codes should not be set if the TPS in unplugged?

 

As far as I can imagine an unplugged TPS would give the open code for VTA just as infinite resistance between VTA and E2 should.

 

Would an unadjusted TPS give error codes? (not according to the TSRM)

[Kristian_Wraae]

Had a second look at the sub throttle TPS and now it measures correctly. So maybe I was checking it wrong when on the car.

 

The throttle TPS is still not working.

 

But again unplugging the TPS should set the error codes, right?

[Kristian_Wraae]

I'm referring to this:

 

HINT:

Diagnostic trouble code 41 is for the throttle position sensor circuit.

Diagnostic trouble code 47 is for the sub–throttle position sensor circuit.

When the connector for the throttle position sensor(s) is disconnected, diagnostic trouble code 41

or 47 is not displayed. Diagnostic trouble code 41 or 47 is displayed only when there is an open

or short in the VTA signal circuit of the throttle position sensor(s).

Signals from the throttle position sensor(s) are also input to the TRAC ECU, so when a malfunc–

tion occurs on the TRAC side, code 41 or 47 may be displayed.

[Kristian_Wraae]

Hmm. it turns out the sub throttle TPS was ok. Adjusted it and plugged it in and the 47 code went away.

 

Then I emulated the main throttle TPS with a set of resistors according to the TSRM connecting IDL to E2 with a wire and VTA to E2 with a 2.4 Kohm resistor, VCC to E2 with 4.7 Kohm.

 

Then the codes went away.

 

So an unplugged TPS on my car gives an error code.