Before you jump all over looking do this.
Unplug the ICP sensor and then put the
meter on Ω. Use the 20K range and then
place one probe on a engine ground point.
Alternator case is handy. Touch the other probe
to each of the pins of the sensor. Report the
readings. I am going to go out and double check
this on my truck. We want to make sure that the
sensor is not grounding on internally.
Then do what WatsonR said with the rest of the harness.
Also I would go over the harness very carefully and look
for any crushed looking spots where something has made
contact. Also check around the fuel filter housing and make
sure that section is not squishy and wet with fuel. I am not
clear if that section of harness has that set of wires in it or not.
But it better to be sure it looks good anyway.

I'll Edit this post once I go out and verify things on my truck.


Sean

EDIT : I went and checked the 3 terminals on my ICP sensor. They
are open to ground. So if you test and get any Ω to ground the
sensor most likely is bad.

 

when doing this check, If more than one is low, that would mean its grounded to another wire or grounded to the metal motor by being squished, or damaged some how.

Randy

 

Also when you do the check try to not move the
wires. You will do that later. Once you get indications
of a short you can start moving or pressing on the harness
in places and work you way up the harness till you
get a change.

The one thing you meter does not have and would make this
a bit easier it a continuity tester with a audio beeper. It makes
a sound depending out when you have or don't have a short/open.
This tool would do the job it simply
But it does not beep.

This is is one of the same type of tools I have.

You may find this very handy

Sean

 

Repped his A$$ for ya!

 

The arrow with the plus sign is probably the continuity check. Turn the disk to there and touch the leads together. If in right the meter will beep.

If I'm right, hold one lead to pin 29 or 2 and the other to the negative battery to see which wire is grounded (the meter will beep). Neither should not be grounded. If one of them is grounded, unplug the icp and test again. If it tests good with the pigtail unplugged, it's the sensor. If you find a short (grounded and the meter beeps) on either wire with it unplugged, there is a problem in the wiring.

 

Never assume when you don't know.
That symbol is for diode and that is the diode check setting.
It does not show the symbol for sound.

Not all meters have a continuity check. The lower costs ones
won't a lot of times. More parts = more money.

Sean

 

Thanks for the correction, Sean. As you can tell, I'm not that knowledgeable on electrical stuff either .... which is why I admitted it was an assumption. I've done the continuity check for a cam and crank sensor once. Doing it from the pcm connector was much easier to rule out, or pinpoint, the problem without chasing wires.

 

We will get you up to speed. Your are correct on the test to try.
PCM is easier to access at times.

It's safer for the socket to put the probe on it from the back side
after you remove the cover. If you push a probe into a socket
you can open it up and then you have some real problems. All you
have to do is unwrap the top layer of tape at the plug cap and then
just unsnap the cover. Re-tape after you snap the cover back on.



Sean