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marco.tms

Member Since: 19 Jan 2022
Location: Italy
Posts: 3

My TD5 turns off by itself

Good morning everyone,
I am writing to find an explanation for a double problem that occurs on my Defender TD5.
Occasionally it happens that the engine shuts off, even when traveling at moderate speed (even at 40 km/h), causing the vehicle to brake abruptly. Fortunately it has never happened at higher speeds, but it is quite concerning.
The engine does not start afterwards, the immobilizer light comes on (red light with engine and thunderbolt) and does not start for several minutes.
Only after removing and putting back keys, a few times put on and taken off anti-theft it starts again. Other times I am forced to disconnect the battery, almost having to reset the ECU.
If it was just an immobilizer problem the engine should not shut off, it should just "not start".
I have already checked:
- ECU negative if it was loose;
- main relay;
- Cable with red plug for related oil/diesel leakage coming to the ECU (I have already replaced the pressure regulator for leakage);
- fuel pump and filters
I'm wondering about an ECU problem, but mine is not the one plagued by the famous problems.

I searched for other posts before writing, but found individual problems not comparable to mine. At least none that involved shutting down the running vehicle.

23rd Jan 2022 12:35pm

geobloke

Member Since: 06 Nov 2012
Location: Nottinghamshire
Posts: 4410

Hi Marco. Sounds awfully familiar to what happened to my TD5. Ended up being the Topside switch and ultimately a replacement ECU. Sorry to say.

23rd Jan 2022 2:31pm

4RF RDS

Member Since: 19 Jul 2015
Location: Ottawa
Posts: 937

2000 Defender 110 Td5 XS CSW Epsom Green

As above it does sound as though your ECU is failing. 🤷‍♂️ Have you opened it up to have a look inside? 2010 Range Rover MkIII Autobiography Super Charged (Idris)
2003 Range Rover Mk III (Desmond FitzWilliam)
2000 Defender 110 CSW TD5 (CTX)
1992 Range Rover Classic (Lizzy)
1972 Series III 300 Tdi (Stanwood)
1967 MGB GT

Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin to slit throats.
H. L. Mencken (1880 - 1956)

23rd Jan 2022 4:01pm

marco.tms

Member Since: 19 Jan 2022
Location: Italy
Posts: 3

I have never opened the ECU, all I can say is that the model is NNW501300.

I did a diagnostic with a person who has an old "nanocom", but he was very unavailable and only gave me a reading without even resetting the error codes for a later reading.

The codes that came out are:
(first page)
- DRIVER DEMAND I LOGGED HIGH
- AIR FLOW CIRCUIT LOGGED HIGH
- AIRCON FAN DRIVE OPEN LOAD FAULT LOGGED (Air conditioning is not present)
- TACHO DRIVE OPEN LOAD FAULT LOGGED
- AIRCON CLUTCH DRIVE OPEN LOAD FAULT LOGGED
- AIRCON FAN DRIVE OPEN LOAD FAULT ACTIVE
- TACHO DRIVE OPEN LOAD FAULT ACTIVE
- AIRCON CLUTCH DRIVE OPEN LOAD FAULT ACTIVE
- HIGH SPEED CRANK SYNC LOST FAULT LOGGED

(second page)
- INJECTOR FAULT(S) LOGGED
- VEHICLE SPEED OUTSIDE BOUNDS FOR CRUISE (WHERE FITTED) ACTIVE
- TOPSIDE SWITCH FAILED PRE INJECTION LOGGED
- INJECTION 1 OPEN CIRCUIT DETECTED LOGGED
- INJECTION 2 OPEN CIRCUIT DETECTED LOGGED
- INJECTION 4 OPEN CIRCUIT DETECTED LOGGED

The most serious problem seemed to be the injectors and now I find also a match with the "topside switch" mentioned by geobloke, however this code reading didn't help me much because the active errors were of other nature (that anyway I don't understand) and the injectors errors are all "logged", so they could be of very old problems.
This was the first diagnostic reading ever done since the 2003 purchase.

If anyone sees anything particular that can help me, thanks.

23rd Jan 2022 4:56pm

4RF RDS

Member Since: 19 Jul 2015
Location: Ottawa
Posts: 937

Now that you have those codes from the initial scan next step is to clear the codes and see what comes back after startup. 2010 Range Rover MkIII Autobiography Super Charged (Idris)
2003 Range Rover Mk III (Desmond FitzWilliam)
2000 Defender 110 CSW TD5 (CTX)
1992 Range Rover Classic (Lizzy)
1972 Series III 300 Tdi (Stanwood)
1967 MGB GT

Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin to slit throats.
H. L. Mencken (1880 - 1956)

23rd Jan 2022 5:24pm

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