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 CONNECTIONS FOR POWERTRAIN CONTROL MODULE AND UPSTREAM O2 SENSOR
1. Check for the presence of loose electrical connections at the Powertrain Control Module and the Upstream O2 Sensor.
  Were any loose electrical connections present?
  
  Yes
  - Restore the correct connections.
  No
  - Go To 3
CHECK THE UPSTREAM O2 SENSOR WIRING CONTINUITY
1. Check the correct continuity of the wiring between the Upstream O2 Sensor and the Powertrain Control Module.
  Does the wiring have continuity?
  
  Yes
  - Go To 4
  No
  - Restore the correct continuity for the wiring.
WIRING INSULATION CHECK
1. Check the correct insulation of the wiring between the Upstream O2 Sensor and Powertrain Control Module.
  Were any faults with the Upstream O2 Sensor wiring insulation found?
  
  Yes
  - Restore the correct insulation for the wiring.
  No
  - Go To 5
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 6
  No
  - Replace the Upstream O2 Sensor. Refer to SENSOR, OXYGEN, REMOVAL AND INSTALLATION .
CHECK THE QUALITY OF THE FUEL
1. Check the quality of the fuel.
2. Check for the presence of water.
  Is the fuel compliant?
  
  Yes
  - Go To 7
  No
  - Replace the fuel.
CHECK OPERATION OF THE FUEL PUMP
1. Check that the Fuel Pump is working properly.
  Is the Fuel Pump working properly?
  
  Yes
  - Go To 8
  No
  - Replace the Fuel Pump. Refer to MODULE, FUEL PUMP, REMOVAL AND INSTALLATION .
CHECK THE INTAKE MANIFOLD FOR SEEPAGE
1. Check the Intake manifold for seepage.
  Is there seepage in the Intake Manifold?
  
  Yes
  - Restore the correct operation of the Intake Manifold.
  No
  - Go To 9
CHECK OPERATION OF THE MAP SENSOR
1. Check that the MAP Sensor is working properly.
  Is the MAP Sensor working properly?
  
  Yes
  - Go To 10
  No
  - Replace the MAP Sensor. Refer to SENSOR, MANIFOLD AIR PRESSURE (MAP), REMOVAL AND INSTALLATION .
CHECK OPERATION OF THE INJECTORS
1. Check for fuel seepage from the Fuel Injectors.
  Are the Fuel Injectors working properly?
  
  Yes
  - Go To 11
  No
  - Replace the Fuel Injectors. Refer to INJECTOR(S), FUEL, REMOVAL AND INSTALLATION .
CHECK OPERATION OF THE EVAPORATION CONTROL SOLENOID VALVE
1. Check that the Evaporation Control Solenoid Valve is working properly.
  Is the Evaporation Control Solenoid Valve working properly?
  
  Yes
  - Go To 12
  No
  - Replace the Evaporation Control Solenoid Valve. Refer to SOLENOID, EVAPORATIVE EMISSIONS PURGE, REMOVAL AND INSTALLATION .
CHECK THE 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 .