Manufacturer Code Charts: 118500
There is an internal fault in component Y94 (Quantity control valve).
Possible cause:
- Y94 (Quantity control valve)
Affected functions:
- Power generation
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Test 1: Check component Y94 (Quantity control valve).
Test 2: Signal wire Check component Y94 (Quantity control valve).
Test 3: Signal line Short circuit
1. Check component Y94 (Quantity control valve).
Test 1.1: Check power supply of component Y94 (Quantity control valve).
Test 1.2: Check components of high pressure control circuit.
1.1. Check power supply of component Y94 (Quantity control valve).
Check actual value Y94 (Quantity control valve).
Test prerequisite
- Engine at idle
Status of relevant actual value:
- Y94 (Quantity control valve):Warning! Communication with ECU required.
Specified value
- On/off ratio:>30%
Question
- Is the actual value o.k.?
YES
The actual value is okay.Test wiring and plug connections between control module N3/9 (CDI control unit) and Y94 (Quantity control valve) for Loose contact, repair or replace if necessary.End of test
NO
Voltage supply of component Y94 (Quantity control valve)
Test prerequisite
- The actual value is not o.k.
Figure legend
- Y94 (Quantity control valve)
Special tool
- Adapter cable220 589 00 99 35
Test sequence
- Switch off ignition.
- Connect adapter cable no. 220 589 00 99 35 to engine wiring harness Y94 (Quantity control valve).
- Ignition ON
- Measure direct voltage with multimeter between sockets (Y94x1) 1 and (Y94x1) 2
Specified value
- Voltage[11...14] V
Question
- Is the measurement value OK?
YES
The measurement value is OK.Further possible causes of fault
- Inspect cables and plug connections between component Y94 (Quantity control valve) and control module N3/9 (CDI control unit) for loose contact, damage and corrosion, repair or replace if necessary.
End of test
NO
The measurement value is not OK.Possible cause and remedy
- Test lines between components N3/9 (CDI control unit) and Y94 (Quantity control valve) for Open circuit.
End of test
1.2. Check components of high pressure control circuit.
Warning!Risk of explosion, poisoning and injury!Fuels are highly inflammable and toxic if inhaled. Fuels may cause skin damage. fuel vapors are explosive, invisible and spread out at floor level, they are toxic if inhaled and produce giddiness and an anaesthetizing effect.Rules of conduct and protective measures
- Wear suitable protective clothing.
- Pay attention to national safety precautions and regulations.
- No fire, sparks, naked flames and smoking.
- Ensure the work place is adequately ventilated.
- Never drain or pour in fuels over assembly pits.
- Store drained fuel in a suitable and sealed vessel.
- Immediately eliminate any fuel which has flowed out.
First-aid measures
- Clean moistened skin with water and soap.
- Change moistened clothing as quickly as possible.
- If fuel gets into your eyes, rinse out your eyes immediately with water and contact a doctor if necessary.
Check components of high pressure control circuit.
NOTE
- This test is used to check the entire high pressure control circuit.
- If no faulty components are identified during the test, do not replace any components.
Test prerequisites
- The low-pressure fuel circuit is OK.
- Ignition ON
Communication with ECU required
2. Signal wire Check component Y94 (Quantity control valve).
Check actual value Y94 (Quantity control valve).
Test prerequisite
- Engine at idle
Status of relevant actual value:
- Y94 (Quantity control valve):Warning! Communication with ECU required.
Specified value
- On/off ratio:>30%
Question
- Is the actual value o.k.?
YES
The actual value is okay.Test wiring and plug connections between control module N3/9 (CDI control unit) and Y94 (Quantity control valve) for Loose contact, repair or replace if necessary.End of test
NO
Voltage supply of component Y94 (Quantity control valve)
Test prerequisite
- The actual value is not o.k.
Figure legend
- Y94 (Quantity control valve)
Special tool
- Adapter cable220 589 00 99 35
Test sequence
- Switch off ignition.
- Connect adapter cable no. 220 589 00 99 35 to engine wiring harness Y94 (Quantity control valve).
- Ignition ON
- Measure direct voltage with multimeter between sockets (Y94x1) 1 and (Y94x1) 2
Specified value
- Voltage[11...14] V
Question
- Is the measurement value OK?
YES
The measurement value is OK.Further possible causes of fault
- Inspect cables and plug connections between component Y94 (Quantity control valve) and control module N3/9 (CDI control unit) for loose contact, damage and corrosion, repair or replace if necessary.
End of test
NO
The measurement value is not OK.Possible cause and remedy
- Test lines between components N3/9 (CDI control unit) and Y94 (Quantity control valve) for Open circuit.
End of test
3. Signal line Short circuit
Test 3.1: Read actual value of component Y94 (Quantity control valve).
3.1. Read actual value of component Y94 (Quantity control valve).
Test prerequisite
- Engine at idle
- Briefly blip throttle.
Status of relevant actual value:
- Y94 (Quantity control valve):Warning! Communication with ECU required.
Specified value
- On/off ratio:<30%
Question
- Is the actual value o.k.?
YES
The actual value is okay.Possible cause and remedy
- In the event of stored faults with a high fault frequency count or in the event of customer complaints, check lines and connectors for loose contact and corrosion..
End of test
NO
The actual value is not o.k.Possible cause and remedy
- This test did not produce any clear result.
- Test cable Y94 (Quantity control valve)- N3/9 (CDI control unit) for Open circuit, repair if necessary.