16B500

Component B76/1 (Condensation sensor for fuel filter with heating element) has an open circuit.


Possible cause:

- B76/1 (Condensation sensor for fuel filter with heating element)
Affected functions:

- Power generation

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Test 1: Check component B76/1 (Condensation sensor for fuel filter with heating element) for proper function.

1. Check component B76/1 (Condensation sensor for fuel filter with heating element) for proper function.

Test 1.1: Check component Water level sensor in fuel.

Test 1.2: Check component Fuel filter heater.

1.1. Check component Water level sensor in fuel.
Check component B76/1 (Condensation sensor for fuel filter with heating element).
Test prerequisites:Ignition ONStatus of relevant actual value:
- Water in the fuel filter.:Warning!

- Water in the fuel filter. ( Raw value ):Warning!
Specified values

- Water in the fuel filter.:NO
- Water level in fuel filter (raw value):NO
Question:Are the actual values o.k.?

YES
The actual values are okay.Possible cause and remedy

- Inspect lines and connectors between control unit N14/3 (Glow time output stage) and component B76/1 (Condensation sensor for fuel filter with heating element) for damage loose contact and corrosion, repair if necessary.
End of test

NO
The actual values are not okay.Possible cause and remedyWater in the fuel filter.Drain water from fuel filter.Inspect lines and connectors between control unit N14/3 (Glow time output stage) and component B76/1 (Condensation sensor for fuel filter with heating element) for damage loose contact and corrosion, repair if necessary.End of test

1.2. Check component Fuel filter heater.
Check component B76/1 (Condensation sensor for fuel filter with heating element) for proper function.
Test prerequisite

- Control unit N3/9 (CDI control unit) does not contain any fault codes or event codes concerning component N14/3 (Glow time output stage).
- Engine at idle
Test sequence

- Component B76/1 (Condensation sensor for fuel filter with heating element) will be actuated for 30 sec. after pressing button F3.
- Component B76/1 (Condensation sensor for fuel filter with heating element) is actuated clocked.
- The fuel temperature rises after approx. 6-8 s.
Move on to actuation with button F2

Warning!Communication with ECU required.