Diagnostic Test

ACTIVE DTC
NOTE: Check for contaminants that may have damaged the O2 Sensor: contaminated fuel, unapproved silicone, oil and coolant.
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
  - Perform the INTERMITTENT CONDITION diagnostic procedure. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
  - Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
CHECKING THE EXHAUST SYSTEM FOR LEAKS
1. Perform the diagnostic procedure for CHECKING THE EXHAUST SYSTEM FOR LEAKS. Refer to Non-DTC Diagnostics/Driveability - Gas - Diagnosis and Testing
  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
(K141) O2 1/2 SIGNAL CIRCUIT

Fig 1: Checking O2 1/2 Signal Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off
2. Disconnect the 1/2 O2 Sensor harness connector.
3. Ignition on, engine not running.
4. Measure the voltage on the (K141) O2 1/2 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 (K141) O2 1/2 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 DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
(K902) O2 DOWNSTREAM RETURN CIRCUIT

Fig 2: Checking O2 Downstream Return Circuit
Courtesy of CHRYSLER LLC
1. Measure the voltage on the (K902) O2 Downstream Return circuit in the 1/2 O2 Sensor harness connector.
  Is the voltage at 2.5 volts?
  
  Yes
  - Go to step 5
  No
  - Check the (K902) O2 Downstream Return 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 DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure
O2 SENSOR
If there are no possible causes remaining, view repair.

Repair
- Replace the O2 Sensor
- Perform the POWERTRAIN VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure