B16FUN
Active Member
- Posts
- 239
- Location
- Stockport, South Manchester
Afternoon all,
My wife's P38 Diesel has thrown up a gearbox fault and I'm looking for any advice having searched the forums.
It happened when she was stationary in traffic in neutral, she moved the selector to drive and it gave gearbox fault on the dash. It also said Fuse 6 fail, Fuse 7 fail, Fuse 17 fail.
The gearbox went into safe mode/limp home mode and will not change from what I am presuming to be 3rd.
When she got home I checked the fuses and 6, 7 and 17 were all fine.
As well as the gearbox fault and fuse failure being displayed on the dash the hevac unit is no longer working and is off completely, the air suspension height indication light has now gone very dim although the suspension is working, the gear selection indicator light by the selector itself is very dim.
I have done some electrical checks and have found the following;
Battery test with engine not running after 30 seconds of load with headlights/mainbeam on and radio (as hevac not working I have not been able to use the demisters) - 12.52v,
Charge circuit at battery with no load and at 2k rpm - 13.62v,
Charge circuit at battery with load at 2k rpm - 13.36v,
Alternator direct at idle - 13.98v,
Negative cable loss check under load - 0.27v,
Positive cable loss check under load - 0.19v,
Voltage drop between negative terminal at battery and first body earth point - 0.01v,
Voltage drop between first body earth point and engine block - 0.17v,
Voltage drop between bolck and alternator housing - 0.06v.
As well as the above I removed fuse 6 and tested voltage across te connectors with the engine running and it read between 2.27v and 2.33v, I don't know what this should read but it at least points to the fact that it is receiving power.
I also checked the under bonnet fuse box and pulled each fuse, finding that fuse 34 had failed so I replaced that. I also pulled all relays to check for scorching and could find no tell tale marks. The fuse box did have a burnt electrical smell but I think that may have been the 25 amp fuse blowing.
So, with everything I've read so far I'm thinking it may be that the alternator is now too weak for the battery and is assisting in the gearbox fault and possibly a bad earth somewhere. What do people think?
Any help will be greatly appreciated.
Thanks,
Andy.
My wife's P38 Diesel has thrown up a gearbox fault and I'm looking for any advice having searched the forums.
It happened when she was stationary in traffic in neutral, she moved the selector to drive and it gave gearbox fault on the dash. It also said Fuse 6 fail, Fuse 7 fail, Fuse 17 fail.
The gearbox went into safe mode/limp home mode and will not change from what I am presuming to be 3rd.
When she got home I checked the fuses and 6, 7 and 17 were all fine.
As well as the gearbox fault and fuse failure being displayed on the dash the hevac unit is no longer working and is off completely, the air suspension height indication light has now gone very dim although the suspension is working, the gear selection indicator light by the selector itself is very dim.
I have done some electrical checks and have found the following;
Battery test with engine not running after 30 seconds of load with headlights/mainbeam on and radio (as hevac not working I have not been able to use the demisters) - 12.52v,
Charge circuit at battery with no load and at 2k rpm - 13.62v,
Charge circuit at battery with load at 2k rpm - 13.36v,
Alternator direct at idle - 13.98v,
Negative cable loss check under load - 0.27v,
Positive cable loss check under load - 0.19v,
Voltage drop between negative terminal at battery and first body earth point - 0.01v,
Voltage drop between first body earth point and engine block - 0.17v,
Voltage drop between bolck and alternator housing - 0.06v.
As well as the above I removed fuse 6 and tested voltage across te connectors with the engine running and it read between 2.27v and 2.33v, I don't know what this should read but it at least points to the fact that it is receiving power.
I also checked the under bonnet fuse box and pulled each fuse, finding that fuse 34 had failed so I replaced that. I also pulled all relays to check for scorching and could find no tell tale marks. The fuse box did have a burnt electrical smell but I think that may have been the 25 amp fuse blowing.
So, with everything I've read so far I'm thinking it may be that the alternator is now too weak for the battery and is assisting in the gearbox fault and possibly a bad earth somewhere. What do people think?
Any help will be greatly appreciated.
Thanks,
Andy.