760 L4-2320cc 2.3L SOHC Turbo B23FT (1984)
Oxygen Sensor (Lambda Sond): Testing and Inspection
Heated Lambda SOND (Three-Wire Type)
Lambda Testing With 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:
1.
Connect a CO meter. Fig. 158.
Fig. 159 CHECK LAMBDA SOND FUNCTION
2.
Warm up engine until it reaches operating temperature.
3.
Disconnect Lambda sond connector. Ground the wire leading to the control unit. Fig. 159.
4.
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.
5.
Connect voltmeter to Lambda sond. Voltmeter should deflect, indicating that the Lambda sond is operating correctly. At the specified CO content
(see "SPECIFICATIONS" > "MECHANICAL SPECIFICATIONS") the voltage should be about 0.3 - 0.7 V.
6.
If the reading is different, replace and retest with new Lambda sond.