Diagnostic Test

CHECK FOR AN ACTIVE DTC
1. With the scan tool, read DTCs.
  Is the DTC active?
  
  Yes
  - Go To 2
  No
  - Test complete.
CHECK OPERATION OF THE UPSTREAM O2 SENSOR
1. Verify that the Upstream O2 Sensor is working correctly.
  Is the Upstream O2 Sensor working correctly?
  
  Yes
  - Go To 3
  No
  - Replace the Upstream O2 Sensor. Refer to SENSOR, OXYGEN, REMOVAL AND INSTALLATION .
CHECK OPERATION OF THE POWERTRAIN CONTROL MODULE
1. Verify that the Powertrain Control Module is working correctly.
  Is the Powertrain Control Module working correctly?
  
  Yes
  - End of diagnosis.
  No
  - Replace the Powertrain Control Module. Refer to MODULE, POWERTRAIN CONTROL (PCM), REMOVAL AND INSTALLATION .