Chery QQ6 Service Manual download pdf (Page 69)

12.10 Unsteady Idle Speed or Extinguish with Load (A/C etc.)

Yes Remove the failure

displayed

1 Put the ignition switch to “ON”. Use a failure

diagnostic tester to check if any failure

information record exists.

No Next step

Yes Next step 2 Turn on A/C switch, connect an adaptor

between ECU and harness, and then measure

75# pin of ECU to see if input signal is present

(high potential signal loaded by A/C switch

through high and low voltage switches).

No Check and repair air

conditioning circuit

Yes Next step 3 Check if the pressure of air conditioning system,

the electromagnetic clutch of compressor and

the air conditioning pump are in right

conditions.

No Repair or replace

Yes Next step 4 Check the voltage on 64#, 65#, 66# and 67#

pins of ECU (for control of DC motor) as well

as corresponding pins on valve body is normal.

No Check controlling

circuit

Yes Check the electric

throttle body

5 Remove electronic throttle body and check if

throttle is locked or is dumb to run.

No Next step

Yes Replace ECU 6 Start engine, turn on A/C, use a failure diagnosis

tester to read such signals as air intake flow and

engine revolution and check if engine

acceleration occurs.

No Replace the

electronic throttle

body

Note: 75# pin is the up level request signal. When turning on A/C switch, an up level

signal will be sent to ECU through this pin, and then ECU will further check other

systems of A/C. If all systems are normal, ECU will control A/C relay to ground and

A/C system will start to work. 60# pin of ECU is medium voltage signal input; when

high potential signal is loaded on this pin, cooling fan will start and run at high speed.

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Chery QQ6 Service Manual Page 69