volkswagen Workshop Repair Guides

Volkswagen Workshop Service and Repair Manuals

ABOUT US
Checking intake air temperature sender > < Matching automatic gearbox control unit and throttle valve potentiometer to one another

Golf Mk3

Digifant Injection and Ignition system (2 valve)
Digifant injection and ignition system
Checking coolant temperature sender

Note:

The work sequence is dependent upon the programme level of the Digifant control unit. Programme level number , connecting fault reader V.A.G 1551 and selecting engine electronics control unit.

  • ● Engine cold
  • ‒ Connect fault reader V.A.G 1551 and select engine electronics control unit (address word 01); selection is carried out with engine idling.
    => Page 01-3
 
→ Indicated on display:
Rapid data transfer     HELP
Select function XX
  • ‒ Input 08 for "Read measured value block" function and confirm with Q.
 
→ Indicated on display:
Read measured value block     HELP
Input display group number XX
  • ‒ Input 01 for display group 01 and confirm with Q.
 
→ Indicated on display:
(1...4 = Display zones)
Read measured value block 1     ⇒
     1     2     3     4

Note:

If something different is indicated on the display:

=> Fault reader operating instructions
 
→ Up to programme level number 1083
037906024D     DIGIFANT     1.7     1083
Coding

(From programme level number 1390 )

  • ‒ Observe coolant temperature figure in display zone 1. The temperature figure must
         Increase uniformly and without interruption.

Notes:

  • ◆ If the display on fault reader jumps by 2...5 °C, it is a control unit fault and not caused by a defective sender.
  • ◆ Open circuit is indicated by - 40 °C.
  • ◆ If irregular engine running occurs in certain temperature ranges and the temperature figure does not increase without interruption, the temperature signal is temporarily interrupted and the sender must be renewed.
  • ‒ Press ⇒ key.
  • ‒ In put 06 for "End output" and confirm with Q.

If the temperature figure does not change:

  • ‒ Carry out electrical check, test step 10
    => Page 01-18 , if necessary renew coolant temperature sender (G62), (first release pressure from cooling system).
 
→ From programme level number 1390
037906024D     DIGIFANT     1.7     1390
Coding
  • ‒ Observe coolant temperature figure in display zone 2. The temperature figure must
         Increase uniformly and without interruption.

Notes:

  • ◆ If the display on fault reader jumps by 2...5 °C, it is a control unit fault and not caused by a defective sender.
  • ◆ Open circuit is indicated by - 40 °C.
  • ◆ If irregular engine running occurs in certain temperature ranges and the temperature figure does not increase without interruption, the temperature signal is temporarily interrupted and the sender must be renewed.
  • ‒ Press ⇒ key.
  • ‒ In put 06 for "End output" and confirm with Q.

If the temperature figure does not change:

  • ‒ Carry out electrical check, test step 10
    => Page 01-18 , if necessary renew coolant temperature sender (G62), (first release pressure from cooling system).

Checking intake air temperature sender > < Matching automatic gearbox control unit and throttle valve potentiometer to one another