2010 Mercedes Benz C 300 (204.054) V6-3.0L (272.947) Page 1431

- Ignition ON

- Engine not running

- Vehicle stationary

- Fuse F32f71 (Fuse 71) is OK.

Actual value:

- Coolant temperature:Warning! Communication with ECU required.

Specified value

- Coolant temperature< 80锟斤拷 C

Proceed to 'Actuation' with F2

1.2. Test PWM signal for operating the suction fan.

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

Test prerequisite

- The ignition must be switched on.

Test sequence

- Check power supply at connector of component M4/7 (Engine and AC electric suction fan with integrated control) (pin 2) against ground.

Specified value

- Voltage[11.0...15.0] V

Continue with button F2

Test PWM signal for operating the suction fan.

Figure legend

- A -ConnectionTest cable 35-pin socket box

- 001 -Sockets of component N3/10 (ME-SFI [ME] control unit)

- 05 -35-pin socket box

- 050 -126-pin socket box

- 108 -Test cable 266 589 01 63 00

- N3/10 (ME-SFI [ME] control unit)

- II 1-63ConnectionTest cable

- III 64-126ConnectionTest cable

Test sequence

- Switch off ignition.

- Connect socket box (35-pin) to component N3/10 (ME-SFI [ME] control unit).

- Connect socket box (126-pin) to component N3/10 (ME-SFI [ME] control unit).

- Switch on ignition.

Warning!

- Connection A of test cable 108 may NOT be connected to connection B of the 126-pin socket box (050).

Continue to test with button F2