240 L4-2127cc 2.1L SOHC B21F (1982)
Fig. 190 GROUND WIRE FROM CONTROL UNIT
3.
Disconnect Lambda sond (oxygen sensor) and ground the wire coming from the control unit (not the one coming from the Lambda sond). Fig.
190.
4.
Dwell reading should be 0°.
5.
If dwell reading is not 0°, replace Lambda sond (provided wiring and control unit are o.k.) and recheck system.
6.
Reconnect Lambda sond and disconnect all testing equipment.