My 1993 pickup, 22re, manual transmission sat for 6 months (ethanol free fuel) until I could fix an oil leak. It fires up and idles good. If 1900 rpm is exceeded after electronics are warmed up it, the engine dies and will restart as the rpm’s drop to 1600 (follows the fuel cut rpm routine). Installed and adjusted new denso TPS. No change. Not throwing any codes. Back probing ECU connector IDL and E2 yields 2.07 volts with throttle valve open. FSM specs state 9 to 14 with key on. Battery is 12.49 volts. Good continuity in IDL wire. No loss in voltage across IDL wire. I believe issue is with ECU. Any suggestions?

 

Does the ECU supply the voltage to the TPS IDL circuit or are the 2.07 volts I measured coming from the TPS headed to the ECU?
Thanks

 

Here's what the FSM says, and the schematic to see it.
The TPS essentially gets the battery voltage on pin 10, and sends it to the TPS from pin E2. The TPS either returns the full voltage to the ECU through E2 to IDL, via the IDLE switch, or as a proportional voltage, indicating how far open the TPS is, if it's off the IDLE switch, through E2 to VTA, then to the ECU pin VTA.

Your best bet is to OHM the TPS. The E2 to IDLE switch is a simple switch, so it should read either a dead short, or an open, if the TPS is open past the switches limit. PRESUMING the TPS is aligned properly. Again, it's in da BOOK.
The book specifies that you should read 2.3 KOhms or LESS, if the TPS is closed down more than 0.53 inches, IE: 0-0.53 inches, and infinity if it's open more than 0.83 inches, measured at the stop screw.

I believe the voltage to ground at E2 of the TPS should be approximately battery voltage (B+). Since the IDLE switch is just that, a switch, what comes out on the IDL pin should either be what you read on E2, if the throttle is closed, or nothing, no voltage, if the throttle is open.

If it's outside those limits, you can try opening the TPS electrical portion to see if there's dirt or corrosion causing the trouble, and if there is, gently clean it with a pencil eraser and some electrical contact spray cleaner. If that's not the problem, time for a new TPS.

I hope my babbling is some small help...
Pat☺

 

Thanks Pat.
The TPS is new and properly adjusted. Double checked.

 

OK, good.
I was just trying, in my long-winded fashion, to answer the question you posed.

Good luck!
Pat☺