9. O2 Signal Circuit

With the ignition on.

Measure the voltage of the O2 Sensor Signal circuit at the O2 Sensor harness connector.

Fig 1: Measuring Voltage Of O2 Sensor Signal Circuit At O2 Sensor Harness Connector

Courtesy of DAIMLERCHRYSLER CORP.

Is the voltage above 0.47 volts? 

1. Yes  >> Check the O2 Signal circuit for damage, short to ground, open, or short to voltage. Inspect the O2 Sensor harness connector and the PCM harness connector. If OK, replace the Powertrain Control Module. See ELECTRONIC CONTROL MODULES article.

   See POWERTRAIN VERIFICATION TEST - VER 2  .

2. No  >> Go To 10