? About ptu testing

[Rubyz32]

So, I've found in the fsm the test for the ptu, but honestly I don't know if I'm doing it right. Is it literally as simple as (for example) there should be continuity between the E1 and I1 points when the positive side or your multimeter is on E1 and the neg. side is on the I1. And that should work out that way across all the pins on the ptu?

Also, in reference to a multiple meter, what does DMM stand for? And does that mean I need a power probe or such to be able to test the ptu?

[ThisIsSparTTa]

I'd follow this, it takes 40 connections to complete the test: dead-cylinder-can-t-figure-out-why-read ... 64452.html
You'll be putting your DMM on resistance mode, and you'll be using the various polarities it defines.
So for instance, for the top row, you'll put positive on "3" or the 'd' pin, and then put negative to each of the "1" pins; 1,2,3,4,5,6. Then you'll put the negative on the "3" or or the 'd' pin, and put positive to each of the "1" pins. Repeat for the other rows.
The polarity is important because you're working with transistors, which should only allow current flow in one direction.
DMM = Digital Multi - Meter , which is opposed to an analog meter (with a needle). Multi-meter refers to the way you can switch modes to measure, AC Voltage, DC Voltage, Current, Resistance, etc. All you need is a meter that can read resistance.

[Rubyz32]

On my DMM, I have a diode symbol that tests for continuity. I assume that since I am testing the ptu which is a transistor, this is what I should be using. Please correct me if I'm wrong. When I use this setting otherwise, I get a beep from the DMM to verify continuity. I am not getting a beep on any of the pins on two different ptu's. I do however get numbers. Mostly in the 5-800 range. Am I doing something wrong? I'm just checking for continuity between the listed pins right?

[ThisIsSparTTa]

You need to look for an ohm symbol for resistance mode. In some cases you'll be getting no-continuity, some cases you will be getting close to 0 and others you will get a real value.

[Rubyz32]

You need to look for an ohm symbol for resistance mode. In some cases you'll be getting no-continuity, some cases you will be getting close to 0 and others you will get a real value.

You've been super helpful. I'm sorry to be such a pain. Thank you. But I have just one more question. How do I know what those values are supposed to be?

[ThisIsSparTTa]

They don't really matter, as long as they aren't very close to 0 or infinity, per the guide. IIRC my numbers were pretty low, like a few ohms.