I was happily driving along last night and suddenly lost all power and the car rolled to a halt, i did the usual checks under the bonnet to see if any wires on the battery had come loose, but nothing, tried starting the car 4-5 mins later and fired back into life and was fine for the rest of the night.

This morning, same thing happened, driving along and it died, parked it up and left it 15-20 mins and it started up fine again, again i drove a further 10 mins down the road and it died again, but now it wont start and when it does , it idles roughly and dies within a second or 2.

I'm scratching my head trying to work out what it is, only thing i noticed while sitting in the car was, with the hazards on my battery voltage on my PSI3 was flickering between 11.4 and 11.6, could it be a duff battery?

Car is a 1999 Rb5.

Any ideas?

 

Seems like low voltage to me, when running should be 14.4v ish, and when no load etc around 12.2ish

 

I believe the sigma alarm on these has a habit of breaking and disabling the fuel pump relay. Mine did this a few months ago when it was a really hot day, but not again since, so I didn't investigate further, but the sigma alarm is a common culprit.

 

Maybe the crank sensor.

 

Mystery continues, getting low voltage to the fuel pump 6.7v.

Im think an alarm fault.

 

These alarms were dealer fit so I think there is both a relay in the alarm unit, and the main one. It could be either, the main one is easy to check/replace with a different one. If that doesn't work then check the wiring, but most likely an alarm issue.

Quite a few people either bypass the relay on the alarm unit (so the main relay works as normal), or you can fix the alarm ECU (normally just a soldering issue) or replace it. One method obviously bypasses some of the CAT1 functionality, and the others don't

 

I wouldn't have a clue where to start and knowing my luck would end up breaking/burning out something else, so have a mobile auto electrician coming Saturday morning.

 

get him to check the black plug under the rear seat for the fuel pump 1st that is a common fault it may be corroded up inside,

 

Sigma M30 alarm burn out!

you need to bypass the alarm relay for the fuel pump. this is the first relay on the alarm that burns out. you CANNOT replace the relay within the alarm unit

if he takes of the dash undertray & also kickplate along door, and follows the 2 really thick (in comparison) fuel pump wires, he'll find the 2 tiny winy alarm wires spliced into it. just unsplice and bridge.

the alarm will still function as normal as it will still cut the starter it just wont cut the fuel pump

next relay to go will be the indicator relay which when you arm/disarm the alarm the indicator on one side will stay on permanently

but yeah dealer bodge fit alarm!

 

I found that myself and it all seems good.

 

As simple as that? Drivers side or passenger?
Ive been pissing about with the fuel pump relay all afternoon with no success.

I was planning on following the wires back from the siren and finding the alarm module and going from there trying to work out how it was spliced into the fuel pump wiring.

You come across like you had this fault?

 

I did indeed have it. It was on my old classic which is a 99 car also. And it really is as simple as that.

Driverside. When you take it off you usually find loads of black insulating tape and wee black wires. The mess depends on how good a job the dealer done on fitting the alarm

The easiest way is to trace fuel pump wires running along side of door and trace back up towards dash, eventually youll find where its been spliced.

Alarm unit is bolted right up in behind steering column, usually a gold box