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Testing Intake manifold temperature sender G72 > < Testing Diesel direct injection system relay J322

Octavia Mk1

Check sender for coolant temperature G62
Check sender for coolant temperature -G62-
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-
t  Cooling spray
Test sequence
–  Connect vehicle system tester -V.A.G 1552-. Start engine and select address word 01 “Engine electronics” → Chapter.
–  Select function 08 “read measured value block” and display group number 001.
   
–  Observe the coolant temperature in display field 4.
   Specified value: the temperature reading must rise evenly
In the event of a fault the fuel temperature or value -5.4 °C is displayed instead.
If an implausible value is displayed in display field 4 or if the fuel temperature is displayed instead:
–  Select function 06 “End output” and confirm with Q.
–  Switch off ignition.
–  Remove engine cover.
  
Reading measured value block         1   ->
900 rpm    5.2 mg/stroke  5.1°CA  20.6°C
–  Disconnect plug -1- from Coolant temperature sender-G62--2-.
–  Connect handheld multimeter to measure the resistance onto both contacts of the coolant temperature sender-G62--2-.
  S23-0119
Specified value:
The specification in field -A- applies to the temperature range 0 to 50 °C, the specification in field -B- applies to the temperature range 50 to 100°C.
Read out examples:
t  The specification for a temperature of 30 °C is 1500 to 2000 Ω
t  The specification for a temperature of 80°C is 275 to 375 Ω
If the specified value is not reached:
–  Replace the coolant temperature sender -G62 -.
If the specified value is reached:
–  Connect test box -V.A.G 1598/31- to the wiring loom on the engine control unit → Chapter.
  N24-0157
–  Check the following wire for interruption or short-circuit to earth or positive:
  S23-0119
Connector -1-,
contact		Test box -V.A.G 1598/31-, bush 
3112 
4104

–  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 Intake manifold temperature sender G72 > < Testing Diesel direct injection system relay J322