Manufacturer Code Charts: 3738

M4/1 (Oil cooler fan) : Open circuit

Test 1: Check component M4/1 (Oil cooler fan).

Test 2: Possible cause:

- M4/1 (Oil cooler fan)
Affected functions:

- Engine cooling

1. Check component M4/1 (Oil cooler fan).

Test 1.1: Check component M4/1 (Oil cooler fan) by means of actuation.

Test 1.2: Test current consumption of component M4/1 (Oil cooler fan).

Test 1.3: Test current consumption of component K25 (Engine oil additional fan relay).

1.1. Check component M4/1 (Oil cooler fan) by means of actuation.
Test sequence

- Ignition ON
- Actuate component M4/1 (Oil cooler fan).
Actuate with key F2.

Warning!Communication with ECU required.


1.2. Test current consumption of component M4/1 (Oil cooler fan).
Test prerequisite

- Battery voltage is OK.
- Relevant fault code exists or there is a complaint.
Test sequence

- Switch off ignition.
- Detach component K25 (Engine oil additional fan relay).
- Measure direct current with multimeter between sockets [K25] 87 and [K25] 30
- Switch on ignition.
Component M4/1 (Oil cooler fan) runs.Specified value

- Amperage [8.0...12.0] A
Question

- Is the measurement value OK?







YES
The measurement value is OK.Possible cause and remedy

- K25 (Engine oil additional fan relay)
End of test







NO
The measurement value is not OK.Possible cause and remedy

- K40/4f35 (Fuse 35)
- Line from component K25 (Engine oil additional fan relay) to component M4/1 (Oil cooler fan)
- M4/1 (Oil cooler fan)
End of test







1.3. Test current consumption of component K25 (Engine oil additional fan relay).
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
Warning!

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







Test sequence

- Measure direct current with multimeter between socket [F.4] 100 of the 126-pole socket box tester and socket [F.44] 14 of the 35-pole socket box tester.
- Switch on ignition.
Specified value

- Amperage [0.1...0.3] A
Question

- Is the measurement value OK?


YES
The measurement value is OK.End of test

NO
The measurement value is not OK.Possible cause and remedy

- Cable to component K25 (Engine oil additional fan relay)
- K25 (Engine oil additional fan relay)
End of test







2. No further information available.