062900

The fuel pump has a short circuit to positive.

Test 1: Check component Fuel pump.

Test 2: Possible cause:

- M3 (Fuel pump)
Affected functions:

- Engine diagnosis
- Fuel system

1. Check component Fuel pump.

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

Test 1.2: Check internal resistance of component M3 (Fuel pump).

Test 1.3: 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 multimeter.
Test prerequisite

- A fault has occurred during current measurement at component M3 (Fuel pump).
Test sequence

- Switch on ignition.
- Unplug 4-pin connector from control module N118 (Fuel pump control module).
- Bridge pin 2 in pin 4 at the unplugged connection of component N118 (Fuel pump control module).
- Measure current.
- Measure direct current with multimeter between sockets (N118) 1.1 and (N118) 1.3
Notes

- Socket (N118) 1.1 : Voltage supply of component N118 (Fuel pump control module): Positive
- Socket (N118) 1.2 : Voltage supply of component N118 (Fuel pump control module): Minus
- Socket (N118) 1.3 : Voltage supply to component M3 (Fuel pump): Positive
- Socket (N118) 1.4 : Voltage supply to component M3 (Fuel pump): Minus
Specified values

- Current: [10.0 ... 15.0] 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

- Check internal resistance of component M3 (Fuel pump).
- Test the cables from component N118 (Fuel pump control module) to component M3 (Fuel pump) with the plug connection X1 between the two.
- M3 (Fuel pump)
End of test

1.2. 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 Plug connection between the two.
- Replace component M3 (Fuel pump).
End of test

1.3. 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 X1 3
- Specified value:< 1ohms
- Measure resistance with multimeter between sockets (N118) 1.4 and X1 1
- 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. No further information available.