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Old 12-08-2009, 04:27 PM
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UCVH and ICP sensor location

Hey fellas,
Where are these items on the truck? I have a 2002.

Thanks,
Tim
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Old 12-08-2009, 04:36 PM
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Could either one of these items being bad contribute to hard starting?
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Old 12-08-2009, 04:37 PM
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The UVCH connectors are in the middle of the inboard side of each head. Nine wire connector plug.

The ICP sensor is inboard on the front of the driver side head near the lifting ring.
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Old 12-08-2009, 06:02 PM
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Here is a pic I saved from another FTE member, properly Robin.

Hope it helps.
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Old 12-08-2009, 06:06 PM
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And to add to what Robin told you, Here is some pic's of the UHVC Diesel Technician Society
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Old 12-08-2009, 06:54 PM
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Here is a pic I saved from another FTE member, properly Robin.

Hope it helps.
Not me Mark. Barry (ZX250) is my guess. But when it comes to "The Brotherhood" everything is community property anyway.

Speaking of Barry, I haven't seen him on in awhile.
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Old 12-08-2009, 07:01 PM
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Why don't you tell us some more about your starting problems Tim. We can probably give you advice on which things to check.
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Old 12-08-2009, 07:28 PM
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problems start at 40 degrees and colder. i have done the following.

new gpr
changed oil and filter to rotella 1540
changed fuel filter and emptied bowl
2 new 850/1000 cca batteries
ohm checked glow plugs

have to crank a long time and it tries to start. plugged in it works fine. starter wont last long at this rate.
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Old 12-08-2009, 07:40 PM
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How does it run once it gets started? Any smoke once it starts? Just because you have a new GPR, have you tested it to make sure the GPR is functioning properly? How many seconds of cranking does it take to start?

It's worth a shot at unplugging the ICP before you try and start to see if that makes a difference. If the truck fires right up with the ICP unplugged, and you can repeat the results, then you need a new ICP.

As mentioned, it's located on the front inboard side of the drivers head.
Click the image to open in full size.
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Old 12-08-2009, 07:47 PM
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If you ohm checked the glow plugs and they all checked out fine, it's probably not the UVCH. If it was, you'd have seen some REALLY high values for resistance on those. I would know, as my passenger side harness shook loose this week. All the resistance values were similar, but they were all really high. Same with the injector values, which is really my main concern, as it's still in the 50's and 60's here.

I had cold starting issues a few weeks ago, and it turned out that the passenger side battery's positive terminal was corroded enough that the battery was not doing anything. It was not getting charged, and not helping start. It WAS connected enough that it was causing the other battery to leech voltage to it overnight, so I had one battery that was about 60% trying to do everything.

If your starter is going strong, though- it sounds like your batteries are good. So I got nothing.
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Old 12-08-2009, 07:50 PM
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What does this ICP gizmo do anyway?
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Old 12-08-2009, 08:00 PM
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What does this ICP gizmo do anyway?
It is the Injection Control Pressure sensor. It reads the pressure of the high pressure oil in the drivers side head and uses that reading, along with other data points to control the duty cycle of the IPR (injection pressure regulator) which will then increase or decrease the oil pressure going to the heads that fires the fuel injectors.

Unplugging the sensor makes the PCM assume default readings from a pre-programmed table.
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Old 12-08-2009, 10:07 PM
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Here is a pic I saved from another FTE member, properly Robin.

Hope it helps.
Just to be nit-picky...the photo shows an arrow pointing to the HPOP when in reality its pointing to the HPOP reservoir. The HPOP is under the fuel bowl and can't really be seen too well from the top. Picky-picky, I know, but hey it might confuse someone, someday whose life depends on it
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Old 12-09-2009, 05:24 AM
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Originally Posted by losfinch View Post
Just to be nit-picky...the photo shows an arrow pointing to the HPOP when in reality its pointing to the HPOP reservoir. The HPOP is under the fuel bowl and can't really be seen too well from the top. Picky-picky, I know, but hey it might confuse someone, someday whose life depends on it
You are right Sir, It should read HPOP reservoir.
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Old 12-09-2009, 02:44 PM
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Originally Posted by losfinch View Post
Just to be nit-picky...the photo shows an arrow pointing to the HPOP when in reality its pointing to the HPOP reservoir. The HPOP is under the fuel bowl and can't really be seen too well from the top. Picky-picky, I know, but hey it might confuse someone, someday whose life depends on it
Here you go. Added Reservoir and UVCH connectors.
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Old 12-09-2009, 02:44 PM
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