2004 GU Patrol 3.0 TD Sub tank warning light

Submitted: Saturday, Jun 03, 2006 at 20:34
ThreadID: 34579 Views:4290 Replies:4 FollowUps:14
This Thread has been Archived
After fitting a CB radio I find I have a Sub tank warning light.
I have re traced my actions, looking where man has been but cannot find any wiring disturbed.
Have done all but remove the CB.
No fuses blown the car drives fine nothing else seems to be amiss.
Any ideas?
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Reply By: On Patrol - Saturday, Jun 03, 2006 at 20:38

Saturday, Jun 03, 2006 at 20:38
Hi Flanker
You maybe pressed the sub tank switch while fitting the radio!!!!
On Patrol
AnswerID: 176553

Follow Up By: Flanker - Saturday, Jun 03, 2006 at 20:44

Saturday, Jun 03, 2006 at 20:44
I am quite sure I did not press the sub tank switch, have also checked the switch.
Nothing to see here!
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FollowupID: 432637

Follow Up By: On Patrol - Saturday, Jun 03, 2006 at 20:46

Saturday, Jun 03, 2006 at 20:46
Flanker
Are you talking of a warning light on the instrument panel or the light on the switch button??
On Patrol
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FollowupID: 432638

Follow Up By: Footloose - Saturday, Jun 03, 2006 at 20:48

Saturday, Jun 03, 2006 at 20:48
Also, is the light on all the time, only when the radio is switched on or only when you transmit ?
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FollowupID: 432639

Follow Up By: Flanker - Saturday, Jun 03, 2006 at 20:58

Saturday, Jun 03, 2006 at 20:58
The warning light on the instrument panel is on as soon as the engine has started.
No light on at any time on the switch.
Does not make any difference what I am doing with the radio.
Cheers
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FollowupID: 432642

Follow Up By: On Patrol - Saturday, Jun 03, 2006 at 21:03

Saturday, Jun 03, 2006 at 21:03
What state is your fuel level in the sub tank, is it low??

Just using the KIS principal mate.

Otherwise I am not sure what else it might be!

The tecnophiles amoung us will be sure to have a say beyond that. Good luck

On Patrol.
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Follow Up By: Flanker - Saturday, Jun 03, 2006 at 21:07

Saturday, Jun 03, 2006 at 21:07
Fuel level in Sub tank about 1/4 main tank about 75 % full.
Cheers
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FollowupID: 432644

Follow Up By: Bonz (Vic) - Sunday, Jun 04, 2006 at 18:05

Sunday, Jun 04, 2006 at 18:05
hqve u checked the drivers manual, sometimes they use the same warning light for three or more different things, maybe your fuel filter needs draining or something?
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Reply By: mattie - Saturday, Jun 03, 2006 at 21:16

Saturday, Jun 03, 2006 at 21:16
Hi Flanker
all the new cars today or very few i have been told have an earth strap from the motor to the chassis sometimes this affects thing in very strange ways (more so when u have put something different in the wirering) maybe worth trying.

Mattie
AnswerID: 176564

Follow Up By: Flanker - Saturday, Jun 03, 2006 at 21:32

Saturday, Jun 03, 2006 at 21:32
Yes Mattie. I am aware of this and have gone to the trouble of disconnecting the radio from the car. pulling the power lead and Aeriel which should eliminate a possible path to the chassis.
I have read a post on this subject.
The solution was to have the computer reset, my opinion is that the control system should be able to handle this without a reset.
Though I had a tow-truck operator leave my ignition on all night in Kunnunara last year. This resulted in all my Keys not being recognised by the Nissan security system. So don't have your battery go flat with the ignition on! but hats another story.
Cheers Peter
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Follow Up By: Member - Roachie (SA) - Saturday, Jun 03, 2006 at 22:05

Saturday, Jun 03, 2006 at 22:05
Disconnect the battery/ies for a few minutes......resets the leccy bits and you should find it will be okay after that.

Much has been written on this forum about sub-tank light on GU's and I've had the same thing happen to mine too. Disconnect power; reconnect; reset the radio stations....all good!!
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FollowupID: 432651

Follow Up By: Flanker - Saturday, Jun 03, 2006 at 22:14

Saturday, Jun 03, 2006 at 22:14
Thanks Roachie. I'll try that in the morning.

Cheers Peter
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Follow Up By: Flanker - Saturday, Jun 03, 2006 at 22:42

Saturday, Jun 03, 2006 at 22:42
I could not wait until the morning.
It worked many thanks Roachie.
Instead of spending all day climbing all over my Patrol, I should have got on the internet!
It remains to be seen if the problem returns when I re connect the CB though!
I'll keep you posted.

Cheers Peter
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FollowupID: 432656

Follow Up By: Muzzgit (WA) - Saturday, Jun 03, 2006 at 23:44

Saturday, Jun 03, 2006 at 23:44
Someone on here last year tried to tell me that the most common cause of electrical faults with Patrols is that they are not earthed in the normal way.

WELL HELLO,,,,,DUH.

Open the bonnet of any patrol you wish to inspect and you will find big fat heavy wire from earth of battery to chassis to engine, as on all cars. It is a lie, a trick, a sham. probably by someone who likes to see Patrols kicked around and given a bad name. Not mentioning any names, acchhhoootoyotadrivers, hum, er snifle, let me wipe my nose, achoo !!!

Some people on these forums spread the most unbeleivable rot sometimes. Anyway, glad to hear all is fixed with the sub tank light now.
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FollowupID: 432662

Follow Up By: Chaz - Sunday, Jun 04, 2006 at 01:03

Sunday, Jun 04, 2006 at 01:03
Sorry Muzzgit, but my Patrol and every GU I have ever worked on DID NOT have an earth wire going to the chassis. It does have one from the battery to the motor and to the body(inside guard), but none to the chassis. The problem is that the motor and the body are rubber mounted to the chassis.
The only electrical component of the car to be fixed to the chassis is the subtank sender and pump wiring, so any other electrical accessories that are fitted to the chassis, eg. spot lights on the bull bar and towbar wiring to trailers etc, try to earth themselves through the subtank wiring, which causes some of these problems. Have a closer look, your earth doesn't go th the chassis!
A simple heavy wire from the body to the chassis solves these problems.
Chaz
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FollowupID: 432669

Reply By: mick - Sunday, Jun 04, 2006 at 10:22

Sunday, Jun 04, 2006 at 10:22
Flanker,

Had a similar problem with mine after some additional accessories were fitted, had to put an extra earthing strap (done by nissan dealer as they put the access. on) and then you mya find that they have to plug in the computer thingy me bob into the vehicle and they reset the sub tank function.

Hope it helps

Mick
AnswerID: 176619

Reply By: Flanker - Monday, Jun 05, 2006 at 18:59

Monday, Jun 05, 2006 at 18:59
Thanks for the help all!
I do seem to be out of the woods.
It's correct there is only one earth to the engine.
I have installed more earths to body and to the Chassis.
I did this out of peace of mind as in 2 weeks we are off to the Cape.

Cheers Peter
AnswerID: 176885

Follow Up By: Flanker - Thursday, Jun 08, 2006 at 19:53

Thursday, Jun 08, 2006 at 19:53
I do hope this is the final chapter.
My own opinion and difficult to prove, but this is what I am assuming.
The CB radio was just a coincidence.
The problem has been the starting battery voltage has been intermittently dropping off while I am driving. Causing all kinds of weired things like transmission to change down while cruising at 100Kmh, Cd player display dimming, hands free kit to beep as if I just inserted the phone. I had to pull over near Yatal yesterday.
I quickly got my meter out shut down the engine and checked the Battery voltage.
It was all over the place varying from 7 volts to 10 volts.
New battery fitted all is back to normal.
Cleared the Sub tank fault by disconnecting the battery for 20 Min's.
I found that I had a sub tank warning indication after each battery voltage episode.
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FollowupID: 433628

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