Diagnostic Test

1. Ignition on, engine not running.
   NOTE: After the repairs have been made, verify proper O2 Sensor operation. If all the O2 Sensor voltage readings have not returned to normal, follow the diagnostic procedure for the remaining O2 Sensors.
2. With a scan tool, read DTCs.

   Is the DTC active at this time?

   Yes 

   • Go to step  2

   No 

   • Refer to the INTERMITTENT CONDITION Diagnostic Procedure. See INTERMITTENT CONDITION .
   • Perform the POWERTRAIN VERIFICATION TEST. See POWERTRAIN VERIFICATION TEST .

1. Perform the diagnostic procedure for CHECKING THE EXHAUST SYSTEM FOR LEAKS. Refer to CHECKING THE EXHAUST SYSTEM FOR LEAKS .

   Were any problems found?

   Yes 

   • Repair as necessary.
   • Perform the PCM Verification Test. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure

   No 

   • Go to step  3

Fig 1: Checking O2 1/1 Signal Circuit

Courtesy of CHRYSLER LLC

1. Turn the ignition off
2. Disconnect the 1/1 O2 Sensor harness connector.
3. Ignition on, engine not running.
4. Measure the voltage on the (K41) O2 1/1 Signal circuit in the O2 Sensor harness connector.

   Is the voltage between 4.5 and 5.0 volts?

   Yes 

   • Go to step  4

   No 

   • Check the (K41) O2 1/1 Signal circuit for a short to ground, open, or short to voltage. If OK, replace and program the Powertrain Control Module per Service Information.
   • Perform the POWERTRAIN VERIFICATION TEST. See POWERTRAIN VERIFICATION TEST .

Fig 2: Checking O2 Upstream Return Circuit

Courtesy of CHRYSLER LLC

1. Measure the voltage on the (K902) O2 Return Upstream circuit in the O2 Sensor harness connector.

   Is the voltage at 2.5 volts?

   Yes 

   • Go to step  5

   No 

   • Check the (K902) O2 Return Upstream circuit for a short to ground, open, or short to voltage. If OK, replace and program the Powertrain Control Module per Service Information.
   • Perform the POWERTRAIN VERIFICATION TEST. See POWERTRAIN VERIFICATION TEST .

If there are no possible causes remaining, view repair.

Repair 

• Replace the O2 Sensor
• Perform the POWERTRAIN VERIFICATION TEST. See POWERTRAIN VERIFICATION TEST .