Diagnostic Test

CHECK FOR AN ACTIVE DTC
NOTE:
Check for contaminants that may have damaged the O2 Sensor: contaminated fuel, unapproved silicone, oil and coolant.
1. Start the engine.
2. Test drive the vehicle. Try to repeat the conditions in which the fault originally set by reviewing the Freeze Frame data, or in accordance with the When Monitored condition.
3. With the scan tool, read DTCs and record on the repair order.
  Is the DTC active or pending?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. INTERMITTENT CONDITION .
CHECK THE EXHAUST SYSTEM FOR LEAKS
1. Perform the CHECKING THE EXHAUST SYSTEM FOR LEAKS test procedure. Refer to CHECKING THE EXHAUST SYSTEM FOR LEAKS .
  Were any exhaust leaks found?
  
  Yes
  - Repair or replace the leaking exhaust parts as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. POWERTRAIN VERIFICATION TEST .
  No
  - Go To 3
CHECK THE O2 SENSOR 1/2 SIGNAL CIRCUIT
1. Turn the ignition off.
2. Disconnect the O2 Sensor 1/2 harness connector.
3. Turn the ignition on.
4. Measure the voltage on the O2 Sensor 1/2 Signal circuit (pin A) in the O2 Sensor 1/2 harness connector.
  Is the voltage between 0.12 and 0.09 volts?
  
  Yes
  - Go To 4
  No
  - Check the O2 Sensor 1/2 Signal circuit for a short to ground, open or short to voltage. If OK, replace and program the PCM in accordance with the Service Information. (Refer to MODULE, POWERTRAIN CONTROL (PCM), REMOVAL AND INSTALLATION ).
  - Perform the POWERTRAIN VERIFICATION TEST. POWERTRAIN VERIFICATION TEST .
CHECK THE O2 SENSOR RETURN CIRCUIT
1. Measure the voltage on the O2 Sensor Return (pin B) circuit at the O2 Sensor 1/2 harness connector.
  Is the voltage at 0.11 volts?
  
  Yes
  - Go To 5
  No
  - Check the O2 Sensor Return circuit for a short to ground, open or short to voltage. If OK, replace and program the PCM in accordance with the Service Information. (Refer to MODULE, POWERTRAIN CONTROL (PCM), REMOVAL AND INSTALLATION ).
  - Perform the POWERTRAIN VERIFICATION TEST. POWERTRAIN VERIFICATION TEST .
OXYGEN SENSOR
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Oxygen Sensor 1/2 and the Powertrain Control Module (PCM).
2. Look for any chafed, pierced, pinched or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals.
4. Perform any Service Bulletins that may apply.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. POWERTRAIN VERIFICATION TEST .
  No
  - Replace the Oxygen Sensor 1/2 in accordance with the Service Information. (Refer to REMOVAL AND INSTALLATION ).
  - Perform the POWERTRAIN VERIFICATION TEST. POWERTRAIN VERIFICATION TEST .