volkswagen Workshop Repair Guides

Volkswagen Workshop Service and Repair Manuals

Early Version With Two Throttle Switches|Page 2711 > < Early Version With Two Throttle Switches|Page 2709
Page 2
background image

-

Switch ignition ON

-

Using multimeter US 1119, check voltage present across terminals of connector 2
Must be approximately 5 volts

If voltage reading NOT OK
-

Check for open circuit in wiring according to current flow diagram

If wiring OK
-

Replace control unit

Full Throttle Enrichment, Checking

Checking Full Throttle Enrichment

Test Conditions

Temperature sensor II minimum 60°C (140°F)
CO tester and VW 1367 connected

-

Start engine and let idle approximately two minutes

-

Slowly accelerate engine until 4000 rpm is reached
CO must read 0.3 - 1.1% Vol.

-

Using squared end of tool VW 1490, bridge terminals of connector 2
CO reading must increase above 1.5% Vol.

If CO readings NOT OK
-

Replace control unit

Early Version With Two Throttle Switches|Page 2711 > < Early Version With Two Throttle Switches|Page 2709