DongFeng H30, Manual, Page: 210 / 302

Maintenance of electrical applicances
22-61
6.2 The self-diagnosis system for the automatic air conditioning
(1) The fault report for the damper actuator and the sensor:
If the damper actuator and the sensor has occurred any fault, then E shall be displayed on the screen,
and the relevant fault code shall also be displayed in the self-diagnosis mode.
(2) The self-diagnosis mode:
First press down AUTO and hold it on, then press MODE after 2sec, the system enters into the
self-diagnosis mode, and displays the fault serial number at the last two digits of the original set
temperature on the screen, the first two digits of the original set temperature displays the fault code,
00 shall be displayed for no-fault, and the fault code shall be displayed it any fault occurred (details
refer to table below). Now the set temperature knob is rotated for turning to the pages, for displaying
the next or the previous code and fault code. Now press OFF key to quit the self-diagnosis mode, and
return to the system original state.
The chart for handling the fault of the damper actuator and the sensor
Fault codes Fault parts/software edition Fault cause and description The handling plan
00 The software edition Two digits edition number
01
The temperature servo
motor
Difficult to rotate, the
potentiometer is short or open
02 The defrosting servo motor
Difficult to rotate, the
potentiometer is short or open
03
The water temperature
sensor
In short or open circuit Take Twat=90
o
C
04
The ambient temperature
sensor
In short or open circuit Take Tamb=20
o
C
05
The temperature sensor
inside the vehicle
In short or open circuit Take Tcab=25oC
06
The evaporator temperature
sensor
In short or open circuit Take Tevap=25oC
07
The heat outgoing air
temperature sensor
In short or open circuit Take Tout1=25
o
C
08
The foot outgoing air
temperature sensor
In short or open circuit Take Tout2=25
o
C
09 The sun light sensor In short or open circuit Take Ldef=300w/m
2
②
The inspection mode
First press AUTO and hold it on, then press , after maintaining for 2sec, the system enters
the inspection mode, and after entering into the inspection mode successfully, Zero shall be displayed
for the ten place digit, ones place digit, decimal and degree centigrade of the original set temperature
of the screen. Rotate the air speed adjustment knob to turn over the page, and display the previous or
the next numerical value, and the original set decimal and degree centigrade of the screen shall
display the inspection serial number, the ten place and ones place, now press OFF key to quit the
self-diagnosis mode, and return to the original state of the system. The details for the inspection refer
to table below.
The table for the inspection numerical value definition
Serial No. Numerical value Remarks
01 Tamb The temperature inside the vehicle
02 Tinc The temperature outside the vehicle
03 Tevap The evaporation temperature
04 Twar The water temperature
05 Tidef (1/20)
The sun light radiation (take 1/20 of the
sample value)
06 Tout vent The breast outgoing air temperature
07 Tout foot The foot outgoing air temperature
08 Speed (1/5)
The vehicle speed (take 1/5 of the
sample value)
09 Tset