Bush Crasher
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Joined: Mon Apr 01, 2013 8:25 pm


Postby 4x4rookie » Tue Oct 01, 2019 3:52 pm

I use an Isuzu NPR to transport my 4x4's around, however it now has a problem and as theres a fair chance someone here knows about them or knows someone - I thought I'd post it here - here's hoping !

Have this problem with my 2010 NPR300 Isuzu truck – believe it has the 4HK1 engine, 220,000km.

ABS light came on afew months ago been driving it around without any problems.

A week ago, started the truck and left it idling whilst I went and got changed. Could here the engine starting to rev alittle higher but assumed it was going through the particulate exhaust filter process.
When I jumped in the truck to drive off, it had gone into limp mode and the engine light had come on and the green exhaust brake light was flashing on and off.

I turned the truck off and took the EGR valve off and cleaned it in the hope it might fix the problem (had to do something). Restarted the truck (it was cold by now) and let it warm up. Tried the exhaust brake lever and the green light on the dash would light up but the butterfly at the exhaust was not operating. I checked for power at the vacuum valve just before the butterfly and there was'nt any when activating the exhaust brake. When I turned the truck off however, the power came on for a second as the truck turned off. I restarted the truck and at just over the 2 bars on the bottom of the temp gauge, I thought it may be warm enough to do a forced exhaust filter clean so held the button down for 15 seconds but no light came on the dash. As it idled the revs slowly increased over 5 minute period upto around 1600 rpm so presumed it was cleaning. However, the revs suddenly dropped and the engine light came back on and the exhaust brake light started flashing again and it went back into limp mode.

So any idea's ?

Hard Yaka
Posts: 710
Joined: Sun Jun 16, 2013 10:50 am
Location: manawatu


Postby BlakeNZ » Thu Oct 03, 2019 7:00 pm

diagnostic analysis will narrow it down. How far are you from the dealer?
sometimes(not always) the exhaust brake warning thing can be a red herring. For instance, when my giga 400 was suffering a faulty speed sensor(located on the top of the trans) the exhaust brake warning light was on, or something similar, can't quite recall.

Hard Yaka
Posts: 733
Joined: Mon Sep 13, 2010 2:34 pm


Postby Cameron » Thu Oct 03, 2019 7:59 pm

Yep take it to your nearest dealer or Isuzu specialising dude with a good scan tool.dpd can be affected by so many things.

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