9. O2 Sensor Signal Circuit Open

Turn the ignition off.

Disconnect the PCM harness connectors.

Measure the resistance of the O2 Sensor Signal circuit from the O2 Sensor harness connector to the PCM harness connector.

Fig 1: Measuring Resistance Of O2 Sensor Signal Circuit

Courtesy of DAIMLERCHRYSLER CORP.

Is the resistance less than 5.0 ohms? 

1. Yes  >> Replace and program the Powertrain Control Module. See ELECTRONIC CONTROL MODULES article.

   See POWERTRAIN VERIFICATION TEST - VER 2  .

2. No  >> Repair the O2 Sensor Signal circuit for an open.

See POWERTRAIN VERIFICATION TEST - VER 2  .