Hevac -Calibration
I set up to calibrate the Blend motors by putting the Temp to 20*C and clearing all faults with Rovercom and turned ignition ‘off’ then ‘on’ as it appears to need, to update the HEVAC ECU.
I then found to my dismay that I had reinstalled the “faulty” motor which had started all the soul searching.I left it there!
Using Rovercom I calibrated the blendmotor/flaps.ALL OK. I then cycled the RH blend motor manually to 'Hi' and back and all is still OK!!
So what caused the original fault?
Here is my theory.During the course of faultfinding I checked continuity of all the wires in the RH Blend motor loom by inserting a probe (fine guitar wire) in the pins of the removed Hevac connector C1597 and the other multimeter probe into their connection inside the motor housing. Pin 7 of this connector gave erratic or no continuity.
I replaced it with a pin from the connector supplied with the 3 x new motors.
Pin7 is the wiper of the RH feedback “pot”……which when open circuit, Rovercom delivers :
“RH Blend motor Pot. Feedback circuit has failed.”
The reason that the circuit continued to fault when cycled to “HI”after I replaced pin7, I can only put down to my failure,pointed out by David, to have Rovercom calibrate the blend motors or I tried to calibrate while there was an active fault present.Also when forcing the motor to a position using Rovercom it certainly faulted at one or near other extreme.
Fingers crossed it will stay OK.
A/C failed to engage compressor.
This is not the first connector fault I have had around the Hevac ECU.Some time ago the A/C compressor would not engage and to cut a long story short traced fault back to needing to remove the Hevac connector CO793 where most of the in-car sensors terminate.Before removing I pushed it in and it went about 3mm further in before a solid “click”.All came right immediately and I wonder if it had been like that from new and only after some serious off-roading had moved.
Thanks again