[4] Check component Y94 (Quantity control valve).: Signal line is interrupted.

[4] Check component Y94 (Quantity control valve).: Signal line is interrupted.

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).
Check component Y94 (Quantity control valve).
Switch off engine.Await running-on time of 4 s.Start engine.

- The engine limit speed must be reached '2 times within 30 s.
- Hold engine limit speed for approx. 3 s.
Status of the relevant actual values:
- Engine speed:Warning! Communication with ECU required.
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 prerequisites:

- The actual value is not o.k.
Figure legend

- 003Multimeter
- Adapter cable
- Y94 (Quantity control valve)
Special tool

- Adapter cable220 589 00 99 35
Test sequence

- Connect adapter cable to component Y94 (Quantity control valve).
- Connect multimeter as specified in connection diagram (right-hand figure).
- Ignition ON
- (Y94) Measure direct voltage with multimeter between sockets 1 and 2 (Y94)
Specified value:

- [11...14] V
Question

- Is the measurement value OK?







YES
Test signal cable to component Y94 (Quantity control valve).
Test prerequisites:

- The voltage supply to component Y94 (Quantity control valve) is OK.
Special tools

- Test cable 271 589 00 63 00
- Socket box 129 589 00 21 00
- Adapter cable220 589 00 99 35
Test sequence

- Connect adapter cable to component Y94 (Quantity control valve).
- Connect 126-pole socket box at engine wiring harness.
- Measure resistance with multimeter between socket [1.76] 76 of the 126-pole socket box tester and socket (Y94) 1
Specified value:

- Resistance <1 Ohm?
Question

- Is the measurement value OK?


YES
Test current consumption of component Y94 (Quantity control valve).
Test prerequisites:

- The signal line to component Y94 (Quantity control valve) is OK.
Figure legend

- 003Multimeter
- Adapter cable
- 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 at component Y94 (Quantity control valve).
- Measure direct voltage with multimeter between sockets (Y94) 1 and (Y94) 2
Specified value:

- Current consumption of component [2,95...3,7] A
Question

- Is the measurement value OK?







YES
The measurement value is OK.Inspect cables, connectors, plug connections, fuses and electrical components for signs of damage, correct connection, loose contact, corrosion etc.End of test

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

- Replace component Y94 (Quantity control valve).
End of test

NO
The measurement value is not OK.Possible cause and remedyTest signal line between components N3/9 (CDI control unit) and Y94 (Quantity control valve) for Open circuit.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.


2. No further information available.


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.