Immobilizer motor problem

Andy70 · 11th May 2021, 23:33

Please someone can help me...??
I change battery of my Rover 75 2.0 comfort Diesel...
Now...sometimes when I stop de motor,in gas station,for example, when I try to star on the car the immobilizer of the motor doesn't work...I have to stop and wait for no less than one hour...then...I put the key,step by step,slowly..and .Star engine normally.
I suppose that the key or central code are wrong...
I case of emergency..if I stop the car...then I have to wait for long time ( no less than 1 hour) to star and unlock the motor and star engine.
Please SORRY MY ENGLISH...I ' am from Spain and try to do my best
How to cancel the immobilizer of motor...? centralita here is really impossible to fix
I'm not have the key Code's
Please...someone can help me...?
My best regards

Rogue · 12th May 2021, 00:18

Unless you are certain it is an immobiliser issue it is probably worth checking that the starter motor solonoid isn't playing up.

vitesse · 12th May 2021, 02:11

If the starter tries/works then it isn't the immobiliser but something else like a camshaft sensor which will sometimes only work when cold. Freeze spray? Easiest to do an OBD check with any reader and check for fault codes. There's a free programme called Toaf which is very good - use the search bar for more information.

Good luck

COLVERT · 12th May 2021, 19:37

Cam sensor being affected by the hot engine.--When it cools the engine will start.

This is an early sign of sensor failure.---

Not expensive and quite easy to fit.---All the information for fitting it is in the --------How-To-------section in the main forum page.

egremont · 13th May 2021, 13:53

This is indicative of a failing camshaft sensor. Replace it now.

Initially, when failing the sensor will work when cold, but ceases to pass the camshafts position information to the engine control module when hot.

I keep a spare in the boot – just in case. When a few hours drive from home (and no replacement was available), a friend placed the removed camshaft sensor in a refrigerator to cool it, then when refitted his car started.

My understanding is that this sensor is only required when starting the engine - to pass position details to the EMS to enable the spark plugs to fire in their correct instance.

Mike Noc · 14th May 2021, 06:27

Quote:

Originally Posted by egremont

My understanding is that this sensor is only required when starting the engine - to pass position details to the EMS to enable the spark plugs to fire in their correct instance.

True enough for the KV6, but the K4 uses a wasted spark and the diesels of course don't have spark plugs so for these engines the camshaft sensor provides the initial reference to the ECM for the fuel injection.

egremont · 14th May 2021, 09:24

Quote:

Originally Posted by Mike Noc

True enough for the KV6, but the K4 uses a wasted spark and the diesels of course don't have spark plugs so for these engines the camshaft sensor provides the initial reference to the ECM for the fuel injection.

Thanks Mike for the correction. I thought we were referring to a V6.
Best I refrain.

COLVERT · 14th May 2021, 16:23

For those who don't know what a ---Wasted Spark is---the spark happens on both inlet and exhaust strokes.--( It fires twice as often as is really needed. ----ie. Wasted. )

11th May 2021, 23:33	#1
Andy70 Newbie Rover 75 Confort Join Date: Feb 2021 Location: Granada Posts: 1 Thanks: 0 Thanked 0 Times in 0 Posts	Immobilizer motor problem Please someone can help me...?? I change battery of my Rover 75 2.0 comfort Diesel... Now...sometimes when I stop de motor,in gas station,for example, when I try to star on the car the immobilizer of the motor doesn't work...I have to stop and wait for no less than one hour...then...I put the key,step by step,slowly..and .Star engine normally. I suppose that the key or central code are wrong... I case of emergency..if I stop the car...then I have to wait for long time ( no less than 1 hour) to star and unlock the motor and star engine. Please SORRY MY ENGLISH...I ' am from Spain and try to do my best How to cancel the immobilizer of motor...? centralita here is really impossible to fix I'm not have the key Code's Please...someone can help me...? My best regards

12th May 2021, 00:18	#2
Rogue I really should get out more....... 75 CDT SE 160 Saloon Join Date: May 2017 Location: Thorpe St Andrew, Norwich Posts: 2,645 Thanks: 1,386 Thanked 1,096 Times in 774 Posts	Unless you are certain it is an immobiliser issue it is probably worth checking that the starter motor solonoid isn't playing up. __________________ Glutton for punishment --- Previously ... 2.6 SD1 x 2, 3.5 SD1, 820S, 820Si x2, 216 Gsi, 220T saloon, 414, 45 1.4 x2 and now a Cowley 75 CDT

12th May 2021, 19:37	#4
COLVERT This is my second home R75 Saloon. Join Date: Feb 2009 Location: France/or Devon. Posts: 14,003 Thanks: 3,851 Thanked 2,167 Times in 1,816 Posts	Cam sensor being affected by the hot engine.--When it cools the engine will start. This is an early sign of sensor failure.--- Not expensive and quite easy to fit.---All the information for fitting it is in the --------How-To-------section in the main forum page. Last edited by COLVERT; 13th May 2021 at 20:21..

13th May 2021, 13:53	#5
egremont Loves to post Rover 75 Connoisseur SE. Auto. Saloon. SE Join Date: Apr 2009 Location: Melbourne Posts: 458 Thanks: 163 Thanked 198 Times in 70 Posts	Camshaft Position Sensor. This is indicative of a failing camshaft sensor. Replace it now. Initially, when failing the sensor will work when cold, but ceases to pass the camshafts position information to the engine control module when hot. I keep a spare in the boot – just in case. When a few hours drive from home (and no replacement was available), a friend placed the removed camshaft sensor in a refrigerator to cool it, then when refitted his car started. My understanding is that this sensor is only required when starting the engine - to pass position details to the EMS to enable the spark plugs to fire in their correct instance.

12th May 2021, 02:11	#3
vitesse I really should get out more....... Rover 75 Saloon Join Date: Jul 2011 Location: Gävle Posts: 2,528 Thanks: 395 Thanked 823 Times in 652 Posts	If the starter tries/works then it isn't the immobiliser but something else like a camshaft sensor which will sometimes only work when cold. Freeze spray? Easiest to do an OBD check with any reader and check for fault codes. There's a free programme called Toaf which is very good - use the search bar for more information. Good luck

14th May 2021, 16:23	#8
COLVERT This is my second home R75 Saloon. Join Date: Feb 2009 Location: France/or Devon. Posts: 14,003 Thanks: 3,851 Thanked 2,167 Times in 1,816 Posts	For those who don't know what a ---Wasted Spark is---the spark happens on both inlet and exhaust strokes.--( It fires twice as often as is really needed. ----ie. Wasted. )