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28th October 2013, 20:18 | #1 |
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Diagnostic check for air temperature control system.
This is how to check that your ATC system is working correctly,
particularly useful for checking that the flaps are working. 1. Press and hold the AUTO switch and the AIR DISTRIBUTION SWITCH and then turn the ignition switch from 0 to II. 2.The audible warning and all indicators on the control panel display cycle on and off while the ECU runs the diagnostic check 3.On completion of the check the display shows FC in the LH temperature window and a two digit fault code in the RH temperature window. 4.If there are no faults the system will revert to normal operation. 5. If a fault is detected, an audible warning sounds three times and the fault codes cycle on and off in numerical order. The audible warning will sound as each fault code is shown. 6.Cancel the check by pressing the OFF switch or turning the ignition switch to 0. 7. In lowlight conditions, to avoid a false 'sunlight sensor fault' indication the sunlight sensor, (centre front of dashboard) needs to be illuminated with a strong light source. FAULT CODES AND DESCRIPTION. 00 - No fault found 11 - in-car temperature sensor open or short circuit. 12 - K bus fault with ambient temperature input 10C. 13 - Evaporator sensor open or short circuit. 14 - Heater coolant temperature sensor open or short circuit. 21 - sunlight sensor-LEFT output open or short circuit,no solar heating correction. 22 - sunlight sensor-RIGHT output open or short circuit, no solar heating correction. 31 - LH temperature servo motor open or short circuit,motor or flap mechanism seized, servo motor locked in position. 32 - RH temperature servo motor open or short circuit,motor or flap mechanism seized, servo motor locked in position. 33 - Distribution servo motor open or short circuit, motor or flap mechanism seized, servo motor locked in position. A rarely mentioned check which could come in very handy. |
29th November 2014, 12:31 | #2 |
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rover 75 saloon Join Date: Apr 2013
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thank you for that info
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2nd January 2016, 10:43 | #3 |
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Rover 75 Tourer Join Date: May 2015
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If by air distribution switch you mean the button next to te Auto on the RHS, I've tried several times and nothing happens...
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2nd January 2016, 11:42 | #4 |
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the air distribution switch is the one that looks like a man sitting down...
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2nd January 2016, 14:40 | #5 |
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Just tried this, and I get fault codes 21& 22. I presume I just need to replace the little sensor in the middle of the dash? A little confused as to a code for a 'left' & 'right' sensor though, as there only appears to be one?
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2nd January 2016, 15:32 | #6 |
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I think you have a standard error code if the test is done when it is too dull outside... you need direct sunlight on the sensor to get a good reading...
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2nd January 2016, 15:45 | #7 |
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Ah that may have been the issue then, as it was overcast when I did it. I'll try again on a nice and bright sunny day.
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