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Testing the air mass meter G70 > < Testing Intake manifold pressure sender G71 and Altitude sender F96

Octavia Mk1

Testing Fuel temperature senderG81
Testing Fuel temperature sender -G81-
Special tools and workshop equipment required
t  Vehicle system tester -V.A.G 1552-
t  Diagnostic cable -V.A.G 1551/3, 3A, 3B oder 3C-
t  Hand multimeter (e.g. -V.A.G 1526 A-)
t  Adapter cable set (e.g. -V.A.G 1594 C-)
t  Test box -V.A.G 1598/31-
Test sequence
–  Connect vehicle system tester -V.A.G 1552-. Start engine (idle) and enter address world 01 “Engine electronics” → Chapter.
–  Select function 08 “Read measured value block” and display group number 007.
   
–  Observe display in display field 1.
   Specified value: approx. ambient temperature
In the event of a fault a replacement temperature of -5.4 °C is displayed.
If an implausible value is displayed in display field 1 or if a replacement temperature of -5.4 °C is displayed instead:
–  Select function 06 “End output” and confirm with Q.
–  Switch off ignition.
–  Remove engine cover.
  
Reading measured value block         7   ->
15.4 °C     0 %      15.9 °C     16.7 °C
–  Disconnect plug -1- from intake manifold temperature sender -G81--2-.
–  Connect handheld multimeter onto contacts 1 and 2 of plug -2- to measure the resistance.
  S23-0136
Specified value:
The specification in field -A- applies to the temperature range 0 to 65 °C, the specification in field -B- applies to the temperature range 65 to 100°C.
Read out examples:
t  The specification for a temperature of 30 °C is 3790 to 4270 Ω
t  The specification for a temperature of 80°C is 600 to 660 Ω
If the specified value is not reached:
–  Replace the fuel temperature sender -G81-.
If the specified value is reached:
–  Connect test box -V.A.G 1598/31- to the wiring loom on the engine control unit → Chapter.
  N23-0334
–  Check the following wire for interruption or short-circuit to earth or positive:
  S23-0136
Connector -1-,
contact		Test box -V.A.G 1598/31-, bush 
1103 
2111

–  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 -J248- → Chapter.
   

Testing the air mass meter G70 > < Testing Intake manifold pressure sender G71 and Altitude sender F96