Engine / Engine management light problems

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Could be any number of things ranging from:

Faulty injectors
High pressure fuel pump failure including regulator, split o ring etc
Low fuel pressure pump
Low fuel pressure sensor
High pressure fuel sensor

Need to carry out a structured diagnosis including monitoring live data from the engine management and voltages and testing the injectors
 
We are still investigating this problem.
In the meantime
we changed the low pressure fuel pump and fuel filter.
We changed the MAF sensor.
The OBD code is P1190.
When we drove the car in a mountain region above 900m altitude, the problem disappeared, and appeared again when the altitude went down.
Next steps,
to clean the fuel pressure sensor connector.
To clean the map sensor in the manifold .
Your thoughts are welcome...


td4van said:
Could be any number of things ranging from:

Faulty injectors
High pressure fuel pump failure including regulator, split o ring etc
Low fuel pressure pump
Low fuel pressure sensor
High pressure fuel sensor

Need to carry out a structured diagnosis including monitoring live data from the engine management and voltages
Click to expand...
 
ECUs have different 'smoke maps' (ie how much fuel it will allow to be injected dependent on how much air is being ingested) for different altitudes, it uses an air pressure sensor to determine which map to use.

The high altitude maps will not allow so much fuel to be injected as there is less oxygen in the air. Therefore its demanding less of the pumping system and less likely to throw fuel pressure warnings and MIL lights.

I would have thought the differences were small, so your warnings must be marginal. I presume the TD4 ECU has these different altitude maps.

This probably isn't the case, but do you know if the car had its ECU remapped during or before your ownership? Often a remap will only adjust the 'normal' sea level (ish) map and it may be mapped to pump more fuel than the pump can deliver. I would have thought that you would see a lot of smoke though if you had a map like that.
 
Thks for the comments here below , GrumpyGel.
Î am pretty much sure the ÉCU has never been reprogrammed or modified.
Some other hints to better understand my problem:
When Î am accelerating the engine above 4000 rpm, without moving the car, the MIL light doesn't appear.
When I leave the car unused at the garage, for a couple of days, the problem doesn't happen easily.
When I drive the car in a sluggish way, it runs fine.
Can it be the common rail' fuel pressure sensor harness and connector/cable issue ?
Regards

GrumpyGel said:
ECUs have different 'smoke maps' (ie how much fuel it will allow to be injected dependent on how much air is being ingested) for different altitudes, it uses an air pressure sensor to determine which map to use.

The high altitude maps will not allow so much fuel to be injected as there is less oxygen in the air. Therefore its demanding less of the pumping system and less likely to throw fuel pressure warnings and MIL lights.

I would have thought the differences were small, so your warnings must be marginal. I presume the TD4 ECU has these different altitude maps.

This probably isn't the case, but do you know if the car had its ECU remapped during or before your ownership? Often a remap will only adjust the 'normal' sea level (ish) map and it may be mapped to pump more fuel than the pump can deliver. I would have thought that you would see a lot of smoke though if you had a map like that.
Click to expand...
 
I don't know what the problem is on your car, the only thing I can say is that there is a little O ring in the TD4 HP pump that degrades and splits over time - when ever its changed it appears to fix what ever problems were occurring and the P1190 error is almost definitely related to the fuel pressure regulator and pump.

It is a small, simple and cheap part - but I believe fitting it is quite complex.
 
Hello,
Î am still struggling with this issue.
Next step will be to control the fuel rail pressure with my i930 OBD Box.
Need to be in the 20/25000 range.(idle)
CAN be the HP fuel pump or sensor...
 
... well. I went back to my initial comments and notes when the MIL code(s) appeared.
Î found that other codes were up :
P1146 and P1116. When I cleared them, they never appeared again.
Meanings are about fuel rail pressure too high linked with MAP sensor malfunction.
In addition to this I observed improvement when we went to a high altitude place, 1000m hill.

My understanding is driving me to an air pressure issue to a bad air/fuel mix.
What do you think ?
 
RodgerTheDodger said:
... well. I went back to my initial comments and notes when the MIL code(s) appeared.
Î found that other codes were up :
P1146 and P1116. When I cleared them, they never appeared again.
Meanings are about fuel rail pressure too high linked with MAP sensor malfunction.
In addition to this I observed improvement when we went to a high altitude place, 1000m hill.

My understanding is driving me to an air pressure issue to a bad air/fuel mix.
What do you think ?
Click to expand...
Did you clean the MAP sensor?
Has the overlay FRPS harness been fitted?
 
Hello:
I have changed the harness of the fuel pressure sensor and I have the following drawback: when turning the ignition key turns on the fan and does not stop working until I disconnect the battery of the vehicle. Replacing the old harness this does not happen. Can someone tell me something?
Thank you
 
Vasquete said:
Hello:
I have changed the harness of the fuel pressure sensor and I have the following drawback: when turning the ignition key turns on the fan and does not stop working until I disconnect the battery of the vehicle. Replacing the old harness this does not happen. Can someone tell me something?
Thank you
Click to expand...

Have you connected the pins on the overlay harness correctly and are all plugs connected on the ecu?
 
In the case of the Freelander TD4, Landrover released
technical bulletin LTB00052 in 2007
which describes water ingress into the wiring loom between ecu and fuel rail pressure sensor.
This damages the sensor and cause various performance and starting problems.
Maybe this also occurs on the ROVER 75/ZT.

https://www.landyzone.co.uk/attachments/td4-pressure-switch-instructions-pdf.110894/

E9F1005F-F10B-43BD-A9C1-522E83480AE5-262-000000F603B20AFD.jpeg
6A253567-25D6-44DE-ABC9-CE99C7668155-262-000000F6421E084C.jpeg
IMG_1928.JPG
E9F1005F-F10B-43BD-A9C1-522E83480AE5-262-000000F603B20AFD.jpeg
IMG_1928.JPG


 
Last edited:
Done.
Change them, cable to ecu and bosch sensor.
Still P1190 MIL light on.
Controlled the injectors and they are only 55000km and changing them doesn't modify this problem.
Next step is to change the HP fuel pump pressure regulator to the rail.
BOSCH 0281002480
64A3EF79-B6FA-459B-B55E-94F6254C1854-179-000000050F021695.jpeg
 

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RodgerTheDodger said:
Done.
Change them, cable to ecu and bosch sensor.
Still P1190 MIL light on.
Controlled the injectors and they are only 55000km and changing them doesn't modify this problem.
Next step is to change the HP fuel pump pressure regulator to the rail.
BOSCH 0281002480
View attachment 129131
Click to expand...

You can just change the seals to the regulator. That's normally what fails, and is much cheaper than replacing the complete regulator assembly. ;)
 
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