Grand Cherokee 2WD L6-4.0L VIN S (1997)
Oxygen Sensor: Testing and Inspection
Component Testing
OXYGEN (O2S) SENSORS
To perform a complete test of the O2S sensors and their circuitry, refer Powertrain Management/Computers and Control Systems/Testing and
Inspection.
See: Testing and Inspection
To test the O2S sensors only, refer to the following:
Fig. 54 Upstream O2S
The upstream O2S sensor is located on the exhaust pipe (Fig. 54).
Fig. 53 Downstream O2S
The downstream O2S sensor is located on the outlet end of the catalytic converter (Fig. 53).
Each O2S heating element can be tested with an ohmmeter as follows:
Disconnect the 02S sensor connector. Connect the ohmmeter test leads across the white wire terminals of the sensor connector. Resistance should
be between 4.5 +/- 0.5 ohms and 7 ohms. Replace the sensor if the ohmmeter displays an infinity (open) reading.
