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TPS sensor test 700

Hi Tinkerbelle,

https://www.brickboard.com/FAQ/700-900/EngineSensors.htm#ThrottlePositionSwitch

Summation: Yes your TPS may be failing in the way I mentioned before with the TPS failing toward the idle control system remaining ON as you accelerate.

The TPS may need to be adjusted so you get the click on throttle close engaging idle control. Yet you need to push the TPS switch to the throttle closed position for idle control to engage.

However, idle control engages, normally, when the throttle is closed and the TPS set to click to engage idle control. The linkage that connects the may have a bind as the ball joint need some lube or is worn. You indicate the throttle or linkage does not close.

Your TPS may have failed whether it needs adjustment.

Get the throttle body and TPS revolved first.

---------------------------------------------
Now onto wandering verbosity!!!! Melatonin hangover here.

You may want to limit your ideas as to the root cause for your check engine light (I guess) and OBD socket two DTC (diagnostic trouble code) 2-3-2.

Did you perform the code check again for any additional fault codes in socket 2? No fault codes, just the all's clear 1-1-1 on the Rex ignition control.

Someone like Spook may be better practiced with Bendix Rex ignition / Regina injection.

Code 2-3-2 is set when the oxygen sensor encounters a fault code.

It sounds like, in your original post, your TPS may be faulty in the way I've encountered.

The engine control system is 'forgiving'. There is a margin of compensation engine control can do when running conditions are within the optimal range.

Yet like your Bendox engine control, the Bosch engine control on my 1989+ 240's, did not report a failing TPS. The engine bogged as you described.

The idle control system remained on as I pressed the gas pedal. No fault code 2-3-2.

Yet when idle control remains on as you press the gas pedal the engine bogs. I had to flutter the gas pedal until avout 20-30 MPH.

So yes, I believe you are correct.

Don't yank that CPS! Why would you want to do so? Your engine has spark and runs (poorly). CPS is fine!

You can find the Mitchell Service wiring diagram that include a PDF page for Bendix Rex / Regina.

See the 1992 Volvo 740 Mitchell Service wiring diagram.
http://www.v8volvo.se/mekartips/volvo/index.html

On PDF page 24 of 30 is the Bendix Regina / Rex system circuit diagram.

Of the three pins at the TPS, you check pins 1 and 3 for continuity when the switch is closed.

You use a Bosch TPS I believe. The switch not the sensor (potentiometer). Looking at iPd and Tasca auto parts is inconclusive.

If you need help in person I can help yet Volvo Pauly is not distant.
--
Beh.






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New TPS sensor test [700]
posted by  tinkerbelle  on Wed Jun 2 10:54 CST 2021 >


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