Oscar H.M. De Vries
Member
- Posts
- 30
- Location
- Amsterdam
Hello,
I am a Disco 2 Enthousiast from the Netherlands. For the last 8 year i have been very happy with my Discovery 2 TD5 however lately it has been developing some questionable problems. I am looking for advice, coners to look for answers and also adresses for having my electronics tested.
Let me explain what the issue is.
July 21, 2017
Car drops to the bump stops on the rear suspension airbags. After start it rises, next day it shows the same issue.
August 2, 2017
Car did not start, turning the ignition key to start position, all lights went out starter engine does not turn over. After taking a hammer and hitting the starter motor the engine kicked into live again. (I now think this was a coincidence and the car was immobilized which was reset when waiting for some time).
The P1843 CAN timeout failure was registered and could be erased.
Later that day the same as above occurred again.
Checked to power on all ECU's and the BCU and EAT were at 11.6 volt where all others were on 12,3 volt.
I found the earth terminal of the battery to the car body to be corroded (big lead to bottom terminal just behind the battery) changed the lead to a non corroded connection just above it and on returning home created a new clean earth)
Check voltage readings on all ECU's they were now within 0,1 to 0,2 volt of each other.
Since then not see again until 31-8-2017
31-8-2017
The day before the car was going like a race car very fast.
This morning the car did not start, the hammer was used at the starter motor with no effect. When checking the status of the BCU and the Auto transmission comp. for errors the P1843 CAN timeout failure was registered.
Trying to erase the fault did not work it came back again and again.
Later that day I started the car, the limp-home mode was off, the lights (M&S) of the transmission comp. did not illuminate. The fault was still in the comp. and would now clear.
Checked the power of the ecu's:
General power 12,39 volt
ECU engine 12,73 volt
SLAB ABS Bat 12,38volt, ECU power 12,38volt
BCU 11,6 Volt, Relay 11,6 volt
IDM battery 11,9 volt
ACE 12,10 volt
Gearbox ECU 11,8 / 12 volt
Next morning the car would not start, no crank nothing (the morning was damp fog in the air) when the sun came out and 1/2 hour later the car started immediately.
My conclusion was starter engine.
1-9-2017
unbolted the fuse box in the passenger compartment, checked it inside out found no signs of corrosion or overheating. Al plugs fitted correctly.
Then checked the BCU for signs of corrosion, non to be found also no signs of overheating, unit looked fine.
Then I found a SRS fault code 8 driver airbag intermittent open circuit, checking the lead under the driver seat for the SRS tensioner, cleaned it and gone was the fault.
Al reconnected and tested no faults in any of the computers, car would start.
2-9-2017
7.30 damp morning, car does not start. 1 hour later when the sun is out it starts.
At test via nanocom, power in IDM is 12,1 volt. When ignition is switched on the engine starts but then cuts out after 1 second, new start not possible BCU relay power is 0 volt, the power reading on the idm is 25,5 volt. Guess this is what you call immobilizationAfter locking the car en unlocking the engine will start again.
I attribute the error to simultaneous read-out on the. Nanocam and starting the engine, power is cycled on the BCU and IDM which I expected caused the fault.
A New code Code p0705 position switch emerges
3-9-2017
Car will not start again, however I no check whether it will start after I switch the auto box from park to neutral and back. It then starts and keeps on running.
4-9-2017
7:30 Same foggy conditions, car starts immediately!
18:30 on returning home the self leveling suspension has lowered to drop the car on to the axel. After starting the bags inflate, the next morning the car is still at normal hight.
Need to check the bags for air leaks.
Question: could the BCU trigger the SLAB to drop the car. If so I would expect this not to happen when the car is not powered up, correct?
After checking all kinds of blog's I have not been able to come to a conclusion as to where the fault is. The fact that the can bus failure was the second to occur and then all the other non starting issue came about + the trigger of SRS and Self leveling issue leads me to believe the BCU is the most likely point. However the 300+ Euro's when it could also be the XYZ for the same 300+ makes me wonder.
Any idea on what the voltage differneces of the variuos ECU's may or can be, Any help from this audience.
I am a Disco 2 Enthousiast from the Netherlands. For the last 8 year i have been very happy with my Discovery 2 TD5 however lately it has been developing some questionable problems. I am looking for advice, coners to look for answers and also adresses for having my electronics tested.
Let me explain what the issue is.
July 21, 2017
Car drops to the bump stops on the rear suspension airbags. After start it rises, next day it shows the same issue.
August 2, 2017
Car did not start, turning the ignition key to start position, all lights went out starter engine does not turn over. After taking a hammer and hitting the starter motor the engine kicked into live again. (I now think this was a coincidence and the car was immobilized which was reset when waiting for some time).
The P1843 CAN timeout failure was registered and could be erased.
Later that day the same as above occurred again.
Checked to power on all ECU's and the BCU and EAT were at 11.6 volt where all others were on 12,3 volt.
I found the earth terminal of the battery to the car body to be corroded (big lead to bottom terminal just behind the battery) changed the lead to a non corroded connection just above it and on returning home created a new clean earth)
Check voltage readings on all ECU's they were now within 0,1 to 0,2 volt of each other.
Since then not see again until 31-8-2017
31-8-2017
The day before the car was going like a race car very fast.
This morning the car did not start, the hammer was used at the starter motor with no effect. When checking the status of the BCU and the Auto transmission comp. for errors the P1843 CAN timeout failure was registered.
Trying to erase the fault did not work it came back again and again.
Later that day I started the car, the limp-home mode was off, the lights (M&S) of the transmission comp. did not illuminate. The fault was still in the comp. and would now clear.
Checked the power of the ecu's:
General power 12,39 volt
ECU engine 12,73 volt
SLAB ABS Bat 12,38volt, ECU power 12,38volt
BCU 11,6 Volt, Relay 11,6 volt
IDM battery 11,9 volt
ACE 12,10 volt
Gearbox ECU 11,8 / 12 volt
Next morning the car would not start, no crank nothing (the morning was damp fog in the air) when the sun came out and 1/2 hour later the car started immediately.
My conclusion was starter engine.
1-9-2017
unbolted the fuse box in the passenger compartment, checked it inside out found no signs of corrosion or overheating. Al plugs fitted correctly.
Then checked the BCU for signs of corrosion, non to be found also no signs of overheating, unit looked fine.
Then I found a SRS fault code 8 driver airbag intermittent open circuit, checking the lead under the driver seat for the SRS tensioner, cleaned it and gone was the fault.
Al reconnected and tested no faults in any of the computers, car would start.
2-9-2017
7.30 damp morning, car does not start. 1 hour later when the sun is out it starts.
At test via nanocom, power in IDM is 12,1 volt. When ignition is switched on the engine starts but then cuts out after 1 second, new start not possible BCU relay power is 0 volt, the power reading on the idm is 25,5 volt. Guess this is what you call immobilizationAfter locking the car en unlocking the engine will start again.
I attribute the error to simultaneous read-out on the. Nanocam and starting the engine, power is cycled on the BCU and IDM which I expected caused the fault.
A New code Code p0705 position switch emerges
3-9-2017
Car will not start again, however I no check whether it will start after I switch the auto box from park to neutral and back. It then starts and keeps on running.
4-9-2017
7:30 Same foggy conditions, car starts immediately!
18:30 on returning home the self leveling suspension has lowered to drop the car on to the axel. After starting the bags inflate, the next morning the car is still at normal hight.
Need to check the bags for air leaks.
Question: could the BCU trigger the SLAB to drop the car. If so I would expect this not to happen when the car is not powered up, correct?
After checking all kinds of blog's I have not been able to come to a conclusion as to where the fault is. The fact that the can bus failure was the second to occur and then all the other non starting issue came about + the trigger of SRS and Self leveling issue leads me to believe the BCU is the most likely point. However the 300+ Euro's when it could also be the XYZ for the same 300+ makes me wonder.
Any idea on what the voltage differneces of the variuos ECU's may or can be, Any help from this audience.
