Malfunction of Exhaust Gas Recirculation (Functional Chain)

Malfunction of Exhaust Gas Recirculation (Functional Chain)

Check component Y31/1 (EGR vacuum transducer).
Test 1 Test Exhaust Gas Recirculation (Function Chain).
Test 2 Check component Y31/1 (EGR vacuum transducer).
Test 3 Perform mechanical inspection of component Y31/1 (EGR vacuum transducer).

1 Test Exhaust Gas Recirculation (Function Chain).

Test sequence
- Start engine.
- Actuate component Y31/1 (EGR vacuum transducer).(Actuate with key F2.)

Note: Component M4/3 (engine/AC electric suction fan) runs with an on/off ratio of 50 % during the actuations for safety reasons.

Note Communication with ECU required.

** End of Test **


2 Check component Y31/1 (EGR vacuum transducer).





Figure legend
- 019Vacuum tester(201 589 13 21 00)
- a3-point distributor
- Y31/1 (EGR vacuum transducer)

Test sequence
- Switch off ignition.
- Remove air cleaner.
- Connect vacuum tester to component Y31/1 (EGR vacuum transducer).
- 60°C Coolant temperature >
- 2000 1/min Drive vehicle on the roller at approx. .

Specified value
- Vacuum[80...220] mbar

Question
- Is the measured value okay?
Yes
Further possible causes of fault
- Perform mechanical inspection of component Y31/1 (EGR vacuum transducer).
No
Possible cause and remedy
- PVacuum line
- PVoltage supply of component Y31/1 (EGR vacuum transducer)( Wiring diagrams)
- PCable from component N3/10 (ME-SFI control module) to component Y31/1 (EGR vacuum transducer)
- PY31/1 (EGR vacuum transducer)

** End of Test **


3 Perform mechanical inspection of component Y31/1 (EGR vacuum transducer)

Test sequence
- Switch off ignition.
- Connect vacuum tester to the EGR valve and apply a vacuum of 300 mbar.
- Detach hose from vacuum tester.

Specified value
- EGR valve should be heard to close.

Question
- Was the test o.k.?
Yes
- The test was okay.
No
Possible cause and remedy
- Y31/1 (EGR vacuum transducer)

** End of Test **