A/C System Failure - Chery QQ6 Service Manual

12.18 A/C System Failure

1 Check if there is enough coolant, if the A/C belt,
the A/C clutch and the pressure switch are in
good condition.
2 Let engine run at idle speed and turn on A/C
switch. Enter A/C self diagnosis mode to check
the A/C system for failure.
3 Turn on the A/C switch and connect an adaptor
between ECU and harness. Measure 75# pin
(A/C switch) of ECU and see if there are input
signals on it.
4 If this vehicle adopts low level control, check if
the air condition is working still even though it
is turned off.
5 Check if there is low level output at ECU pin
No.69 (connect to the ground of pull in winding
of A/C relay).
Note: Different from the controlling means of other models, the A/C control system of A21 adopts the
automatic A/C and uses double-pressure switch to control incorporation of the A/C system and the fan
after A/C starts up.
Yes Next step
No Troubleshooting
Yes Remove the failure
displayed
No Next step
Yes Next step
No Check the harness
Yes Replace or repair the
harness
No Next step
Yes Repair the
replay and harness
No Replace ECU
A/C