[Jamiehol]

So I plugged my newly acquired FCR into m P38 today, to try and resolve an intermittent appearance on the book symbol on the heater display.

I had a total of 5 faults:

Right-hand blend motor short circuit
Right-hand blower motor
Internal temperature sensor
Solar sensor
Heater core sensor short circuit.

Now the first two I can understand, like wise the last one I think I may have caused when I forgot to reattach the sensor after swapping the O rings.

However where are the internal and solar sensors ?

Thanks

 

[kds]

The internal one is behind little grill under the clock and solar one is on top of dash in middle, little black button looking thing.

 

[Alan C]

Watch out for the solar sensor fault. I have the Blackbox MSV, it was giving me this fault, but after buying a new sensor and not curing the fault it turned out to be transposed with the heater core sensor, changing the sensor clipped to the pipes near the O-rings cured the fault. Blackbox were informed, but no response. Now I know you have the FCR not the MSV kit, but just so you're aware. The solar sensor is about £80, wouldn't want you to waste that. With the MSV I can look at live data and even though it was reporting the solar sensor fault it was giving a credible reading which altered depending on received light, as it should, the core heater sensor was on the other hand giving a constant reading of -30 degrees.

Reset all your fault codes, and see which come back, then investigate those. The logged solar sensor fault wasn't causing the book symbol on my HEVAC, but I did have a duff burnt fusebox which was causing faults to log for the blower motors.

 

[Jamiehol]

Thanks for the responses, especially the info regarding the solar sensor. I have managed to pick up a new boxed solar sensor up from a Land Rover dealer for £10.

My plan was to clear the faults which I have done, and then run the car for a few days and then see which faults had come back.

 

[Jamiehol]

Just by way of an update cleared all the faults on Friday night and have had the heater core fault come back.

Does anyone know the acceptable resistance figures for this sensor ?

 

[Datatek]

Why worry about the resistance? If it comes up as faulty, more than likely it is faulty.

 

[Jamiehol]

So I can do a basic check to rule out a wiring fault as the fault code says short to ground.

Given the sensor is about 20 pounds if I can do a further test to help it is the sensor at fault then why not.

 

[Datatek]

So I can do a basic check to rule out a wiring fault as the fault code says short to ground.

Given the sensor is about 20 pounds if I can do a further test to help it is the sensor at fault then why not.

If the sensor is shorted to ground I would expect to see a reading of at or near zero ohms. Not sure but I think the resistance values might be given in RAVE, they are for some things.

 

[Jamiehol]

Yes logic does suggest if the fault code is shorted to ground the reading be close to zero ohms, will take a look in Rave thanks for the tip.

 

[jt_armstrong]

Just by way of an update cleared all the faults on Friday night and have had the heater core fault come back.

Does anyone know the acceptable resistance figures for this sensor ?

Is this fault not related to the fact that you forgot to reattach it when you did the O rings?

 

[Jamiehol]

No it's not as after clearing the faults on Friday I ensured the sensor was connected to the loom and also the pipe work. The fault has then come back.

 

[Jamiehol]

Update time. I managed to grab 5 minutes yesterday and removed the heater core temperature sensor and hooked it up to my DVM after leaving a little while to get to room temp in the house, it registered approx 1.4M Ohms.

As the car was in for its MOT today and as I drove past the Landy dealer I popped in and they had a new sensor and it was only 16 pounds, got it home at carried out the same test it registered 40k Ohms.

Have fitted the new sensor and cleared the faults so will see how I go for a few days.