Chery Tiggo T11 LHD. Manual - part 52
Chery T11 Service Manual Electric Injection System
21
14. Air Conditioning Control System (A/C)
Principle: Turn on these A/C switches. If both
the A/C pressure and the data detected by the
evaporator temperature sensor are normal, the
A/C request signal will pass through these
switches and get to the ECU. The ECU controls
the A/C relay attracting after it detects this signal.
At the same time, it gives stepper motor a
speed-increasing signal, and switches on the
electronic fan. And the A/C system begins to
operate.
Conditions to switch off A/C system:
1) Throttle position sensor failure;
2) Vehicle speed sensor failure;
3) When the engine is with large load;
4) Evaporator temperature sensor failure;
5) The evaporator temperature is less than
1.5℃;
6) The engine speed is overspeed;
7) The coolant temperature is greater than
108℃;
8) Refueling is too quick.
Trouble Diagnosis:
1) Short circuit of A/C relay wire to earth;
2) Short circuit of A/C relay wire to power
supply;
3) Open circuit of A/C relay wire;
4) Too-low evaporator temperature sensor
temperature;
5) Over-high evaporator temperature sensor
temperature.
Troubleshooting:
1) Examine the wire of A/C system;
2) Examine the damage of A/C system’s
evaporator temperature sensor;
3) Examine the wire jumping inside the
harness.
Circuit diagram of A/C control system
Pin:
No 1 for the A/C request signal (to ECU
39#);
No 2 for the A/C relay control (to ECU 46#).
A/C Request Signal
Power Supply
A/C Compressor Clutch