EP0011

The control unit is overheated.

Test 1: Check component M3 (Fuel pump).

Test 2: Check attachment and installation position of component N118 (Fuel pump control module).

Test 3: Check power supply at control unit N118 (Fuel pump control module).

Test 4: Possible cause:

- M3 (Fuel pump)
- N118 (Fuel pump control module)
- Inspect attachment and installation position of control module N118 (Fuel pump control module).
Affected functions:

- Engine diagnosis
- Fuel system

1. Check component M3 (Fuel pump).

Test 1.1: Check power consumption of component M3 (Fuel pump) using actual value.

Test 1.2: Check power consumption of component M3 (Fuel pump) using multimeter.

Test 1.3: Check internal resistance of component M3 (Fuel pump).

Test 1.4: Test the cables from component N118 (Fuel pump control module) to component M3 (Fuel pump) with the plug connection M3x1 (Fuel pump connector) between the two.

1.1. Check power consumption of component M3 (Fuel pump) using actual value.
Warning!Communication with ECU required.


1.2. Check power consumption of component M3 (Fuel pump) using multimeter.

1.2. No further information available.


1.3. Check internal resistance of component M3 (Fuel pump).
Test prerequisite

- A fault has occurred during current measurement at component M3 (Fuel pump).
- The power supply of the control unit N118 (Fuel pump control module) is OK.
Test sequence

- Switch off ignition.
- Unplug 4-pin connector from component N118 (Fuel pump control module).
- Measure resistance.
- Measure resistance with multimeter between sockets (N118) 1.3 and (N118) 1.4
Specified value

- <2ohms
Was the test o.k.?







YES
The test was okay.End of test

NO
The test was not okay.Possible cause and remedy

- Test the cables from component N118 (Fuel pump control module) to component M3 (Fuel pump) with the plug connection M3x1 (Fuel pump connector) between the two.
- Replace component M3 (Fuel pump).
End of test

1.4. Test the cables from component N118 (Fuel pump control module) to component M3 (Fuel pump) with the plug connection M3x1 (Fuel pump connector) between the two.
Test prerequisite

- A fault has occurred during current measurement at component M3 (Fuel pump).
- The internal resistance of component M3 (Fuel pump) is not OK.
Test sequence

- Switch off ignition.
- Unplug 4-pin connector from component N118 (Fuel pump control module).
- Unplug coupling A at component rack M3x1 (Fuel pump connector).
- Check lines to component M3 (Fuel pump) for short and open circuits.
- Measure resistance with multimeter between sockets (N118) 1.3 and (M3x1) 4
- Specified value:< 1ohms
- Measure resistance with multimeter between sockets (N118) 1.4 and (M3x1) 2
- Specified value:< 1ohms
- Measure resistance with multimeter between sockets (N118) 1.3 and (N118) 1.4
- Specified value:infiniteohms
Was the test o.k.?







YES
The test was okay.End of test

NO
The test was not okay.Possible cause and remedy

- Test cable to component M3 (Fuel pump).
- Replace component M3 (Fuel pump).
End of test

2. Check attachment and installation position of component N118 (Fuel pump control module).

Test 2.1: Check using actual value

Test 2.2: Test current consumption of component M3 (Fuel pump).

Test 2.3: Inspect attachment and installation position of control module N118 (Fuel pump control module).

2.1. Check using actual value
Test
Status of relevant actual value:
- Temperature in control module:Warning! Communication with ECU required.
Is the measured value within the specified value range?

YES
The measurement value is OK.End of test

NO
The measurement value is not OK.Further possible causes of fault

- Test current consumption of component N118 (Fuel pump control module).
- Inspect attachment and installation position of control module N118 (Fuel pump control module).


2.2. Test current consumption of component M3 (Fuel pump).

Test 2.2.1: Check power consumption of component M3 (Fuel pump) using actual value.

2.2.1. Check power consumption of component M3 (Fuel pump) using actual value.
Warning!Communication with ECU required.


2.3. Inspect attachment and installation position of control module N118 (Fuel pump control module).
Figure legend

- N118 (Fuel pump control module)
Preparation for test

- Expose component N118 (Fuel pump control module).
Test

- Check mounting screw for component N118 (Fuel pump control module) and tighten if necessary.
Was the test o.k.?







YES
The test is o.k..

NO
The test is not o.k..Possible cause and remedy

- Check threaded connection of component N118 (Fuel pump control module) and tighten if necessary.


3. Check power supply at control unit N118 (Fuel pump control module).
Possible cause and remedy

- N10/2f4 (Fuse 4)
-
Question

- Is fuse OK?







YES
Test prerequisite
Test sequence

- Switch on ignition.
- Unplug 4-pin connector from component N118 (Fuel pump control module).
- Measure voltage at the unclipped cable.(Ground- Positive)
- Measure direct voltage with multimeter between sockets (N118) 1.2 and (N118) 1.1
Specified values

- Voltage: [11.0 ... 14.5] V
Question

- Is the measurement value OK?







YES
The measurement value is OK.Further possible causes of fault

- Inspect plug connections for corrosion, pinched insulation and loose contact.
End of test

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

- Inspect lead of voltage supply to control module N118 (Fuel pump control module) if necessary for loose contact, damage and corrosion and repair.
End of test

NO
Replace faulty fuse.End of test

4. No further information available.