Chery QQ6 Service Manual download pdf (Page 51)

11.14 Double Brake Switch

Failure codes: P0571, P0504

No. Operating steps Result Follow up steps

1 Put the ignition switch to “ON”. Next step

Yes Next step 2 Pull out brake switch joint on harness, and then

use a multimeter to check if it is short or break

circuit between 1#, 2# pins of this joint and 21#,

58# pins of ECU.

No Check the circuit

Yes Next step 3 Close the ignition switch, and then check if an

around 12V battery voltage is present on 3# pin of

the switch joint.

No Check the circuit

Yes Next step 4 Open the ignition switch, and then check if an

around 12V battery voltage is present on 4# pin of

the switch joint.

No Check the circuit

Yes Next step 5 Release brake pedal, disconnect sensor connector,

and then check if 1# and 3# pins cut off.

No Replace the brake

switch

Yes Next step 6 Release brake pedal, disconnect sensor connector,

and then check if 2# and 3# pins conducts.

No Replace the brake

switch

Yes Next step 7 Apply brake pedal, disconnect sensor connector,

and then check if 1# and 3# pins conducts.

No Replace the brake

switch

Yes Check other part 8 Apply brake pedal, disconnect sensor connector,

and then check if 2# and 4# pins cut off.

No Replace the brake

switch

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Chery QQ6 Service Manual Page 51