3. Disconnect The O2 Sensor

Turn the ignition off.

Disconnect the O2 Sensor harness connector of the affected sensor.

Turn the ignition on.

With the DRB III(R), monitor the O2 Sensor Signal voltage.

Fig 1: Monitoring O2 Sensor Signal Voltage

Courtesy of DAIMLERCHRYSLER CORP.

Is the O2 Sensor voltage less than 1.4 volts? 

1. Yes  >> Replace the affected O2 Sensor. See FUEL SYSTEM article.

   See POWERTRAIN VERIFICATION TEST - VER 2  .

2. No  >> Go To 4