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| dorsetsmith Member Since: 30 Oct 2011 Location: South West Posts: 4554  |
form your and my schematic LRJ made mods in 2.4 07 to 2011
 back to TD5 AS10 crank wiring Last edited by dorsetsmith on 29th Mar 2019 12:37pm. Edited 3 times in total |
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5th Dec 2018 2:09pm |
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| Martin Site Admin Member Since: 02 Apr 2007 Location: Hook Norton Posts: 6637  
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My docs are "VIN 760595 on" but that suggests it's after yours?
 1988 90 Td5 NAS soft top
2015 D90 XS SW |
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5th Dec 2018 2:23pm |
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| dorsetsmith Member Since: 30 Oct 2011 Location: South West Posts: 4554 |
will make note on this
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5th Dec 2018 2:29pm |
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| redline Member Since: 28 Jun 2015 Location: Mountains and Lakes Posts: 221 
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My VIN is 771xxx suggesting that the immobilizer controls the starter relay coil. But again, to my knowledge, my vehicle is not equipped with an immobilizer, unless it is disabled, as I do not have a key fob.
Vehicle is a LHD is that makes a difference. |
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5th Dec 2018 2:31pm |
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| Martin Site Admin Member Since: 02 Apr 2007 Location: Hook Norton Posts: 6637
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The box is fitted anyway as it controls stuff like the interior lights from the door switches.
Plus even with no fobs I'm almost certain the immobiliser is still linked to the ECU and carries out an immobilisation function. 1988 90 Td5 NAS soft top
2015 D90 XS SW |
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5th Dec 2018 2:44pm |
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| dorsetsmith Member Since: 30 Oct 2011 Location: South West Posts: 4554 |
unit is in place but in spider mode if you have no fob Last edited by dorsetsmith on 29th Mar 2019 12:38pm. Edited 1 time in total |
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5th Dec 2018 2:54pm |
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| redline Member Since: 28 Jun 2015 Location: Mountains and Lakes Posts: 221
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Martin / Dorset - many thanks for the help and clarifications!
I'm assuming the immobilizer is the dreaded Lucas 10AS that I have read so much about on this very forum. Great. 
So the two questions are now: 1. How do I check if the issue is indeed the immobilizer? Presumably see if it is energizing the starter relay coil (pins 85-86)... 2. How do I reset / fix this? Does it have a separate fuse? |
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5th Dec 2018 3:15pm |
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| Martin Site Admin Member Since: 02 Apr 2007 Location: Hook Norton Posts: 6637
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Do the interior lights come on OK when you open the door(s)?
Have you got the new or old interior lights fitted? 1988 90 Td5 NAS soft top
2015 D90 XS SW |
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5th Dec 2018 3:45pm |
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| redline Member Since: 28 Jun 2015 Location: Mountains and Lakes Posts: 221
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Martin - yup, once I changed the fuse that had blown (F30 10A) - which you and Doset helpfully pointed me to - interior lights functioning normally on both ON/DOOR.
New lights are fitted (front had been swapped previously, this time added the rear). |
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5th Dec 2018 3:56pm |
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| redline Member Since: 28 Jun 2015 Location: Mountains and Lakes Posts: 221
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Just found this with regards to the Lucas 10AS....!
1. Electronic Engine Immobiliser (Used on MFI-T16 and 300TDi with EDC engines) This system is controlled by the Engine Management ECU and the Alarm ECU. When the vehicle is immobilised, the alarm ECU sends a signal to the EMS ECU which prevents starting, and until it receives a de-immobilise signal it will not start. 2. Remote Smart Spider (Used on MFI-T16 and 300TDi without EDC engines) This system is controlled by the alarm ECU and the Engine immobilisation ECU (Spider). The alarm ECU sends a signal to the spider ECU to disable vehicle start, which then interrupts the starter circuit, fuel pump circuit and ignition coil (If fitted) or the fuel pump shut off solenoid in the case of the 300TDi engine (without EGR). NOTE : The vehicle can only be started using the Plip key or the EKA code. |
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5th Dec 2018 8:24pm |
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| dorsetsmith Member Since: 30 Oct 2011 Location: South West Posts: 4554 |
https://www.technozen-electronics.co.uk/la...-services/
start by making shore you have + DC supply to you ignition switch and down to the starter relay coil with the switch start position also make shore you haven't blow more fuse |
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5th Dec 2018 8:59pm |
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| redline Member Since: 28 Jun 2015 Location: Mountains and Lakes Posts: 221
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Right - finally had some time to look at this:
1. Checked all fuses in main and secondary boxes. ALL OK 2. Checked starter relay. I am getting power across pins 85 and 86 (coil side). However I am only getting 7V, NOT 12V ... Not sure if this is normal?! 
Dorset - am I correct in assuming that if I am getting power at the starter relay, I don't need to check for power at the ignition? |
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7th Dec 2018 11:37am |
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| dorsetsmith Member Since: 30 Oct 2011 Location: South West Posts: 4554 |
Checked starter relay. I am getting power across pins 85 and 86 (coil side). However I am only getting 7V, NOT 12V ... Not sure if this is normal?! Confused
Right Checked starter relay again but thing time 86 (coil side) to body work ground, are you getting 12v 
if you still get 7v check the battery voltage Poz to neg , then check poz to body work ground are you getting 12v ? Last edited by dorsetsmith on 7th Dec 2018 12:22pm. Edited 3 times in total |
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7th Dec 2018 11:58am |
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| BenB8man Member Since: 22 Mar 2017 Location: Norfolk Posts: 430 
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7 volts isn't normal. What's your battery voltage?
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7th Dec 2018 12:01pm |
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