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Check intake manifold temperature sender G72 > < Testing fuel pump relay J17

Fabia Mk1

Check intake manifold pressure senderG71
Check intake manifold pressure sender -G71-
Special tools and workshop equipment required
t  Vehicle system tester -V.A.G 1552 -
t  Diagnostic cable -V.A.G 1551/3- or -V.A.G 1551/3A- or -V.A.G 1551/3B-
t  Hand multimeter (e.g. -V.A.G 1526 A-)
t  Adapter cable set (e.g. -V.A.G 1594 A-)
t  Test box -V.A.G 1598/31-
Test sequence
–  Connect vehicle system tester -V.A.G 1552-. Start engine and select the “address word 01” for engine electronics → Chapter.
–  Enter function 08 “Read measured value block” and select display group number 003.
   
Readout on display:
–  Read off intake manifold pressure indicated in display field 2.
   Specified value:
1.0 ltr./engine: 300 to 550 mbar
1.4 ltr. engine: 350 to 600 mbar
If the specified values are not reached:
–  Select function 06 “End output” and confirm with Q.
–  Switch off ignition.
  
Reading measured value block         3   ->
780/min    418 mbar   4.7 %    6.0°b.TDC
–  Unplug connector -1- from intake manifold pressure sender -G71- with intake temperature sender - G72--2-.
–  Switch on ignition.
–  Connect the multimeter for voltage measurement as follows:
  S24-0387
4-pin plug on wiring loom, contactSpecification 
3 + 4approx. 5 V 
3 + earthapprox. 5 V

If the specified values are reached:
–  Check the wiring for short-circuit to pos. term.
If no short-circuit is found:
–  Replace intake manifold pressure sender -G71- with intake manifold temperature sender -G72- → Chapter.
If the specified values are not reached:
–  Switch off ignition.
–  Connect test box -V.A.G 1598/31 - to the wiring loom on the engine control unit → Chapter.
–  Check the following wire for interruption or short-circuit to earth or positive:
   
4-pin plug on wiring loom, contactTest box -V.A.G 1598/31 -, bush 
396 
495

–  Also check the wires for short-circuits.
–  If necessary eliminate wire interruption or short-circuit.
If the lines are not found to be faulty:
–  Replacing engine control unit → Chapter.
   

Check intake manifold temperature sender G72 > < Testing fuel pump relay J17