240 L4-2320cc 2.3L SOHC VIN 83 B230FD (1993)
Oxygen Sensor: Testing and Inspection
Lambda Testing W/ Volt, Ohm and CO Meter
Fig. 158 CONNECT CO-METER
To test the Lambda sond, all potential problems influencing a Lambda sond reading (ignition, fuel injection, intake and exhaust system etc.) must be
checked and corrected.
The Lambda sond can be tested as follows:
Connect a CO meter. Fig. 158.
Fig. 159 CHECK LAMBDA SOND FUNCTION
-Warm up engine until it reaches operating temperature.
-Disconnect Lambda sond connector. Ground the wire leading to the control unit. Fig. 159.
-CO content should increase to indicate good wiring and control unit. If the CO content does not increase, check wiring to control unit, repair or
replace as needed.
-Connect voltmeter to Lambda sond. Voltmeter should deflect, indicating that the Lambda sond is operating correctly. At the specified CO content
the voltage should be about 0.3 - 0.7 V.
-If the reading is different, replace and retest with new Lambda sond.
-Assemble Lambda sond connector.
Testing Lambda Sond Heating Element:
