Adrian Flux : 0800 916 1257

Isuzu Trooper Owners Club UK™
Isuzu Trooper, Rodeo, Bighorn, Mu & VehiCROSS Owners Club
 
 FAQFAQ   SearchSearch   Watched TopicsWatched Topics   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your personal messagesLog in to check your personal messages   Log inLog in 
CalendarCalendar  ITOCUK Club ShopClub Shop  ITOCUK Classified Ads serviceClassified Ads
ITOCUK HomeITOCUK Home   dynamic online chat serviceChatrooms  Yellow Diamond ClubsYellow Diamond Clubs

Defined: The white wire trick (orps related non start test)


 
Post new topic   Reply to topic    Isuzu Trooper Owners Club UK™ Forum Index -> Engines
View previous topic :: View next topic  
Author Message
scj103
Lifetime member
Lifetime member


Joined: 07 Feb 2009
Posts: 509
Location: Norfolk (watton)

PostPosted: Sun Feb 16, 2020 22:30    Post subject: Defined: The white wire trick (orps related non start test) Reply with quote

If you have been told to search for 'the white wire trick' then this is it.

This article applies to the Isuzu 3.0 (2999cc) 4jx1 (Heui) engine fitted to Isuzu Troopers and Bighorns, Honda Horizon, Vauxhall Monterey sold in the UK 1998-2005, and to the Isuzu Rodeo (Vauxhall's frontera) sold outside the Uk.

It does not apply to the 3.1 4jg2 or 3.2/3.5 petrol engines.

If you have a non starting 4jx1, or one that intermittently doesn't start, you can perform the following routine to test whether the non starts are caused by the Oil Rail Pressure Sensor (orps) being faulty.  This exercise fools the ECU into believing  that the sensor reports adequate rail pressure, which all else being well will enable the injectors and start the engine.

If the truck does start that indicates a faulty orps.
If the truck does not start, you have other issues.
Please start a new post with the results, do not comment on this thread.

The exercise:

On the left hand side of the engine at the bulkhead is the main engine oil dipstick.
Beside that is a multi plug loom connector which connects the vehicle wiring loom to the pink injector wiring loom.
This connector is the focus of your attention.

If you look at the wires coming up to the connector, there is one, in the middle which was once white, though may now be yellowing.
That is the wire that you need to disconnect. The neatest way to disconnect it is by removing the grey connector clip, and then using a tiny screwdriver, releasing the pin from the connector and gently withdrawing it using its wire. This way when the test is complete you can just push it back in.

If you are unable to withdraw the pin, then cut the white wire somewhere it is long enough to fit two crimp spade terminals ready to rejoin them afterwards.

*****DO NOT ATTEMPT TO RUN OR DRIVE LIKE THIS******

If you have an old or worn oil rail control valve this can cause the control valve to jam shut and cause further non running.
It will also cause misfuelling and potentially further engine issues. It is usually ok to drive home if you have had to cut the wire following a breakdown.







_________________
'98S reg Irish Trooper 3.0DT Citation (LWB 7seat)
65 plate Octavia Scout
'83 A reg 2CV...
Back to top
View user's profile Send personal message Visit poster's website
Google
Sponsor





PostPosted: Sun Feb 16, 2020 22:30    Post subject: Google Ads keep this community free to join!


Back to top
AnnaMia
Newbie


Joined: 02 Sep 2021
Posts: 1
Location: UK

PostPosted: Thu Sep 02, 2021 14:07    Post subject: Reply with quote

Quite educative and a lot of insights for my case!
Thanks for the post!
Back to top
View user's profile Send personal message
Display posts from previous:   
Post new topic   Reply to topic    Isuzu Trooper Owners Club UK™ Forum Index -> Engines All times are GMT + 1 Hour
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


All contents © Hobson's Choice IT Solutions Ltd 1997 on
Powered by phpBB © 2001, 2005 phpBB Group