Golf L4-1781cc 1.8L SOHC (1987)
Note: Some early vehicles are not equipped with a 3 pin lambda connector. On these vehicles, disconnect only the oxygen sensor connection
(Arrow).
-
Start the engine and raise speed to a minimum of 2100 RPM four times, letting the throttle close each time.
-
Connect jumper wire lead to the terminal for the green wire which goes to the Digifant E.C.U. (Arrow).
Note: On 3 pin connector, connect jumper to terminal 1 in the white hard-shell (black wire).
-
Hold jumper wire briefly to ground.
-
CO content must rise. If CO content rises:
-
Replace the oxygen sensor.
If CO content does not rise:
-
Check for broken or grounded wire between oxygen sensor connector and terminal 2 of the E.C.U. connector.
If the wiring is OK:
-
Replace the Digifant E.C.U.