Volkswagen Workshop Service and Repair Manuals

Special tools, testers and auxiliary items

• ◆ Fault reader V.A.G 1551 with cable V.A.G 1551/3
• ◆ Chilling spray (commercially available)

Test sequence

• ‒ Remove intake manifold temperature sender (G72) and reconnect to connector.
• ‒ Seal sender threaded hole.
• ‒ Connect fault reader V.A.G 1551 and select engine electronics control unit (address word 01); selection is carried out with engine idling .

• ‒ Input 08 for "Read measuring value block" function and confirm with Q.

• ‒ Input 03 for display group 03 and confirm with Q.

Note:

If something different is indicated on the display:

=> Fault reader operating instructions

• ‒ Read intake manifold temperature in display zone 4.
       Specification: Approx. ambient temperature
• ‒ Spray sender with commercially available chilling agent.
• ‒ Observe coolant temperature figure in display zone 4. The temperature figure must
       decrease uniformly and without interruption.

Notes:

• ◆ With ignition switched on -49 °C is indicated.
• ◆ Open circuit is indicated by - 25.9 °C.

• ‒ Press ⇒ button.
• ‒ Interrogate and erase fault memory, eliminate faults if necessary => Page 01-5 .
• ‒ Input 06 for "End output" and confirm with Q.

If the temperature figure does not change:

• ‒ Carry out electrical check, test step 25
  => Page 24-14 , item 7 .