Omega Owners Forum
Omega Help Area => Omega Electrical and Audio Help => Topic started by: Sir Popple on 27 November 2010, 11:30:34
-
Hi, i hope someone can help, i have changed the oil inter-cooler, rocker cover gaskets and thermostat on my MV6 2000yr, and now the car will not start. I have checked around to make sure all is connected as it should be to find that the fuel pump is not running up. Having done the paper clip test i get the following fault codes 21, 48, 57, 49, 31, 73, 94. do i now have a faulty crank sensor? or is it something else?
-
21 Throttle Position Sensor (TPS) Voltage High
48 Battery Voltage Low
57 Idle Air Control Voltage Low
49 Battery Voltage High
31 No Engine RPM Signal (IGNORE THIS ONE)
73 Mass Air Flow Sensor Voltage Low
94 Hall Sensor Voltage High
Double check all the plugs are in fully and in the right holes.
-
how can the battery voltage be low and high? doesnt make sense ;D
-
Thx i will double check, though before i did the job the car cut out on the wife and would not restart, but after 5mins or so it fired. ?
-
Well all plugs seem to be in the correct place and pushed together...
I wish to eliminate the fuel pump by checking for a feed there are 4 wires going to the plug in the boot, 2 Brown 1 Red Blue and 1 Blue Black and ideas which are the fuel pump feed wires?
Thanks
-
As you look down the wires towards the plug it's the left 2. The right 2 are for the fuel gauge.
Before you do that attach a jump lead from a solid metal point on the engine and the other to the -ve on the battery and try it. It seems to me that it's not grounding properly.
-
Sorry i am struggling to understand, i am getting +12v on the on the blue black and an earth on the brown next to it when i turn the ign on?
-
IIRC the fuel pump +ve is red/blue.
-
Thx Welung, I do not have any voltage on the red/blue when i turn the ignition on?
-
Thx Welung, I do not have any voltage on the red/blue when i turn the ignition on?
You won't. The fuel pump is only live when a) the engine is cranking and b) the crank sensor detects that the engine is turning.
Have you tried the jump lead?
-
yes, still no joy!!!!!
-
Shame you're not still in Cannock :(
-
Just going to grab the wife to crank the engine to see if i get 12v on the red/blue
-
I would come home tomorrow, fancy a house in Ireland
-
Ok, I am getting 0.38V+ on the red/blue when i crank the engine is this correct?
-
Should be 12v or there abouts. Check the fuel pump relay.
-
Wellung, thanks for all your help, can you point me in the direction of the fuel pump relay thx
-
Purple, rear of triangular box under bonnet http://www.omegaowners.com/forum/YaBB.pl?num=1176542235
-
Thx On my way to check
-
OK i have fiddled with the fuel pump relay tapped it, smiled at it, and talked to it encouragingly and woe and behold she started ran for 3 mins and cut out !! how do i get this relay out so i can test it on the bench. Thanks to all
-
It does just pull out, but they often stick. I'd get a replacement from scrappy, then it matters little the damage you do ;)
-
It just pulls straight out but can be difficult, try getting a flat blade screwdriver under it and wiggle it upwards.
-
I've got a couple here if you want one sending Sir P.?
-
OK, Thanks to all again, here we go for another day of playing... I would love to get parts from Scrappy but i am stuck in Ireland !!! Thx
-
Here we go again.. The relay works fine on a regulated power supply on checking the feed to the relay on the car i am only getting 0.33 volts when cranking the engine. Any ideas anyone?
-
Please read the post before this, i have tried holding the Fuel relay in manually which does run the fuel pump, and then had the bright idea of holding the fuel pump relay in manually while cranking the engine to see if it would start but it didn't, ??????
-
Crank Sensor?
I know they are troublesome on the Omega, but I had the same problem on a Beetle with burning out a fuel pump relay due to a knackered crank sensor - spent hours on that bloody relay only to find it was something else.
:-?
-
Thx, that is what i was thinking, is there anyway of testing it?
-
Crank Sensor?
I know they are troublesome on the Omega, but I had the same problem on a Beetle with burning out a fuel pump relay due to a knackered crank sensor - spent hours on that bloody relay only to find it was something else.
:-?
I think Dave has probably identified the most likely cause.
The lead to the crank sensor degrades due to the heat from the exhaust manifold and disturbing it (by wrestling with the cam covers) can be the final straw.
Not all failed crank sensors bring up a code. When mine failed it didn't.
What I did notice was that with the failed sensor in place (and the engine failing to start) the engine management light stayed lit while the engine was cranking. With the new sensor fitted the light extinguished the moment the starter engaged and started cranking the engine.
As already said the ECU doesn't run the fuel pump unless it can sense the engine is turning.
-
Andy, Thanks my engine light is staying on when i crank it as well. I am going to order a replacement part from Auto Vaux today unless someone advises differently. They have quoted £28 plus £7pp to Ireland. They want 93.17euro over here for the same part!!! Thx to all again, Steve
-
Andy, Thanks my engine light is staying on when i crank it as well. I am going to order a replacement part from Auto Vaux today unless someone advises differently. They have quoted £28 plus £7pp to Ireland. They want 93.17euro over here for the same part!!! Thx to all again, Steve
Waste of time, for that money it`s deffo not genuine
-
so how much should a genuine one be? and are the non genuine ones that bad?
-
Omega Part Number Retail Price Normal Trade Trade Club
Crankshaft sensors
2.5 (early models) 90492006 £83.50 £75.15 £65.12
2.5 (later models) 90492061 £61.50 £55.36 £47.88
2.6/3.0/3.2 90540743 £55.00 £49.56 £42.63
-
RobG, thanks i will look around to see where i can get a genuine part and get it shipped to Ireland Thx
-
Send a PM to Andy http://www.omegaowners.com/forum/YaBB.pl?action=viewprofile;username=5C5359445E3D0
-
PM sent Thx