Scanner that tests sensors?

[90somethinchevy]

I have a 94 c2500 gmc sierra. I've been throwing parts at it to get the idle better which got me wondering is there a tool that would scan an obd1 truck and tell you if a sensor is working within certain parameters or at all? I'm not getting any codes to help me so I'd be looking for something that would allow me to check them without a check engine code

 

[Drunkcanuk]

Most people would use a digital multimeter to check sensors and sender's, there is a difference. Check voltage, resistance etc.
Can pick them up fairly cheap, as compared to a actual Snapon or equivalent data reader.

 

[fancyTBI]

Yes! There are. Most run-of-the-mill scanners won’t do that. You’d have to spend a bit on a used Snap On or get a GM Tech2 clone from China. A multimeter paired with the FSM would work well also.

 

[Drunkcanuk]

As @fancyTBI pointed out, the FSM (factory service manual) is a great resource.
They are in a sticky in the engine and performance section. Download your year.

 

[Drunkcanuk]

I have a 94 c2500 gmc sierra. I've been throwing parts at it to get the idle better which got me wondering is there a tool that would scan an obd1 truck and tell you if a sensor is working within certain parameters or at all? I'm not getting any codes to help me so I'd be looking for something that would allow me to check them without a check engine code

How are you checking for codes?
Just no check engine light?
Or did you use the OBD1 port and have the CEL flash?

 

[1998_K1500_Sub]

is there a tool that would scan an obd1 truck and tell you if a sensor is working within certain parameters or at all?

A scan tool can’t vary the throttle from closed to WOT, for testing a TPS.

Neither can it apply vacuum, for testing a MAP sensor.

These are examples that come to mind of sensors that couldn’t be tested “within certain parameters” without user interaction.