Test 1: Check Component M4/7 (Engine and AC Electric Suction Fan With Integrated Control)

Check component M4/7 (Engine and AC electric suction fan with integrated control)

Test prerequisite
- The CAN communication with control module N22 (AAC pushbutton control module) or N22/7 (Comfort AAC pushbutton control module) is o.k.

Test sequence
- Switch off ignition and then switch on.
- Operate engine at idling speed.
- Status of the relevant actual values:
- Fan capacity, effective (on/off ratio): Communication with ECU required
- Request of fan capacity from air conditioning (basic load): Communication with ECU required
- Request of fan capacity from air conditioning (working load): Communication with ECU required
- Temperature of coolant: Communication with ECU required
Note: The electric suction fan for engine or air conditioning is off in the case of on/off ratio of 10%, and it runs at maximum speed in the case of an on/off ratio of 90%. When unplugging the socket of component B11/4 (Coolant temperature sensor), the fan capacity request (from engine) rises to 90%.

Specified values
- Temperature of coolant <80°C, Air conditioning OFF: Suction fan STATIONARY
- Temperature of coolant <85°C, Air conditioning ON: Suction fan RUNNING
- Temperature of coolant >90°C, Air conditioning OFF: Suction fan RUNNING

Question: Was the test o.k.?