 | Home > Td5 > Help diagnosing engine cutting out issue |
 
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| TD5Ad&Alf Member Since: 06 Jan 2025 Location: Staffordshire Posts: 8   
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My newly purchased TD5 Defender 2003 has recently started cutting out usually after around 5mins of driving, it wont restart (Turning over/cranking but not firing) until I lock it and unlock it again when it starts normally first time, runs for a further approx 5mins then cuts out again (same process repeated gets it going again)
I may be out but I suspect something to do with the immobiliser, mainly because it starts again fine when locked and unlocked with the fob, although I haven’t read about anyone experiencing the car cutting out due to this? Usually just not starting in the first place? Since I have had it I have noticed the interior lights don’t work on the door switches, but do when I switch them on manually. It has the green AS10 unit behind the cluster and a fob, the fob only appears to unlock & lock the doors, the immobiliser light on the speedo lights up/flashes when the car is locked and goes out when unlocked with the fob. There is no indicator flashing or horn sounding when locking or unlocking with the fob. Is this likely to be an issue with the AS10 unit? Or should I be looking elsewhere (Fuel pump relay etc) I’m not sure if its connected but the EML light comes on just as it cuts out, but this could be due to the engine dying as it goes out as normal when the car restarts. Any ideas? |
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13th Jan 2025 9:16pm |
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| TD5Ad&Alf Member Since: 06 Jan 2025 Location: Staffordshire Posts: 8
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Good suggestion about changing the fob battery I’ll try that and if no better I’ll try running it with the fuel cap off, good suggestion also to listen out for the fuel pump, I’m not sure it was running when I was trying to restart it.
The interior lights and indicators are definitely not acting as you describe maybe that’s linked to the fob battery though as you suggest. The cutting out is very consistent and regular, which is what makes me think it’s being caused by something electronic and possibly the AS10, I’d expect it more randomly if it was a bad connection/earth issue? |
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14th Jan 2025 2:44pm |
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| landy andy Member Since: 15 Feb 2009 Location: Ware, Herts Posts: 5755 
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I’d definitely start with fob batteries
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14th Jan 2025 3:33pm |
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| TD5Ad&Alf Member Since: 06 Jan 2025 Location: Staffordshire Posts: 8
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Yep I’ll give that a go, wont see it till the end of the week as work gets in the way!!
Is it possible for the AS10 to cut the engine after its started then? In instances like the fob loosing connection due to low battery? Immobilisers I've come across in the past will prevent an engine from starting but not stop it once running, I guess it could be a Landroverism!  |
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14th Jan 2025 7:21pm |
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| landy andy Member Since: 15 Feb 2009 Location: Ware, Herts Posts: 5755
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Yes, but when mine is having a “moment”, it starts then stops, after seconds. Not minutes. But that’s not to do with fob battery, What I do know is when the indicators stop working with tha alarm then that is an indication of low remote battery. I question if the battery is also there to power the chip/transponder for the immobiliser.
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14th Jan 2025 7:37pm |
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| TD5Ad&Alf Member Since: 06 Jan 2025 Location: Staffordshire Posts: 8
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Certainly a good place to start, I’ll replace the battery and try it again.
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14th Jan 2025 7:57pm |
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| NickMc Member Since: 01 Oct 2014 Location: Norn Iron Posts: 1641  
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Likely water intrusion on the 10AS box or the blue header under the drivers seat (RHD). You can split the 10AS and inspect the board easy enough.
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14th Jan 2025 10:51pm |
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| MadTom Member Since: 10 Sep 2013 Location: Olomouc Posts: 632  
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Lock and unlock has connection with immobilizer, but you have also whitche off power of the engine ECU, and switche off engine. There is no communication betweet engine ECU and 10AS after engine start, just once during the immo off procedure during engine start.
Before dismantling engine and/or fuel parts, try anothe engine ECU. Any type, just needed pairing with 10AS (or removed immobilizer). Not to drive the car far away, but to run the engine long enough, to be sure, that the problem is not in broken engine ECU. I have seen some, with only partly damaged parts inside. "Drobek" = The Small One - Discovery 2, "Blufínek" = The Blue Thing - Defender 130, and for me at least Ford Mondeo  |
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15th Jan 2025 2:07pm |
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| TD5Ad&Alf Member Since: 06 Jan 2025 Location: Staffordshire Posts: 8
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I’ll check for water ingress on the AS10 thanks, what’s the blue header under the seat?
Also does anyone know if the AS10 can stop the engine at anytime (maybe by controlling the pump?) I’ve read lots of posts where it’s stopped the car from starting but not once it’s been running for a while? |
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15th Jan 2025 2:56pm |
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| TD5Ad&Alf Member Since: 06 Jan 2025 Location: Staffordshire Posts: 8
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Sorry only just read this reply, I’ll still check water ingress around the AS10 but I wouldn’t expect it to be able to stop the car once running either, there was a small amount of oil in the red plug when I bought it but I’ve since replaced the injector loom and seen none since, I feel a nancom purchase coming 🤣 |
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15th Jan 2025 3:01pm |
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| MadTom Member Since: 10 Sep 2013 Location: Olomouc Posts: 632
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Oil in cables is not a real problem, compared to watter in cables. But as female connector pins in injector harness going old and older, they weaken - because of time and because of heat/cold cycles, and slowly loosing contact. Injectors are powered/commanded from ECU with 85V/25A impulses. Unlike to connector to lights, these will not burn, i case od bad contact, but ECU will sense it.
Just tighten these pins a bit. A for the oil going out ot the head - replace 2 O-rings. And wait for all oil in cables slowly migrates out. But this is a bit different problem. 10AS can stop starter from turning and ECU from controlling injectors during engine start, but not stop engine from running. I have repaired quite a lot of engine ECUs and seen some with partly broken or fully broken components, but still working at least a bit. This is why I recommend test car with another TD5 engine ECU (any type/version is enough for basic test), because this is simple and fast, compared to dismantling "half of engine" to look for possible non existing problem. "Drobek" = The Small One - Discovery 2, "Blufínek" = The Blue Thing - Defender 130, and for me at least Ford Mondeo |
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16th Jan 2025 6:20am |
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