740 L4-2.3L SOHC VIN 88 B230F (1985)
Check ground(s)
-
Connect an ohm-meter between terminal 1 and ground, and between terminal 2 and ground.
Meter should show less than 1 ohm resistance in both cases. Check wiring continuity if value is higher.
Check voltage supply
-
Turn ignition ON.
-
Connect a volt meter between terminal 5 and ground.
Meter should show battery voltage. Check wiring continuity and fuel system relay if lower than battery voltage.
Check CO-adjustment screw
-
Turn ignition ON.
-
Connect a volt meter between terminal
14 at the LH control unit and ground.