Diagnostic Test

CHECK FOR AN ACTIVE DTC
NOTE:
This DTC sets to indicate a general Intake O2 Sensor system circuit or component failure. The PCM runs secondary tests to pinpoint which circuit has the failure. It is important to diagnose any correlating DTCs relating to this fault first. If there are no other DTCs present, the most likely cause is related to an intermittent circuit connection or component failure.
1. With the scan tool, read DTCs and Freeze Frame Data and record on the repair order.
2. With the scan tool, erase DTCs.
3. Using the recorded Freeze Frame Data and the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
4. With the scan tool, read DTCs.
  Did the DTC return?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
CHECK FOR CORRELATING DTCS
1. Refer to the recorded DTCs.
  Were there any 02 circuit high DTCs present?
  
  Yes
  - Perform the applicable PCM diagnostic procedure(s). Refer to 2.0L - DIAGNOSTIC CODE INDEX .
  No
  - Go To 3
CHECK THE O2 SENSOR CIRCUITS FOR A SHORT TO VOLTAGE
1. Disconnect the Intake O2 Sensor harness connector
2. Measure for voltage at the:
  - (K45) Intake O2 Signal circuit at the Intake O2 Sensor harness connector.
  - (K735) Intake O2 Current Pump Control circuit between the Intake O2 Sensor harness connector.
  - (K907) Intake O2 Return circuit at the Intake O2 Sensor harness connector.
  - (K732) Intake O2 Pump Cell Current Trim at the Intake O2 Sensor harness connector.
  NOTE:
  With the Intake O2 Sensor disconnected, the PCM will power down the Intake O2 Sensor and there should be no voltage on the circuits.
  
  Do any of the circuits measure above 0.5 volts?
  
  Yes
  - Repair the circuit that measured above 0.5 volts for a short to voltage.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 4
REPLACE THE INTAKE O2 SENSOR AND RETEST FOR DTC
1. Replace the Intake O2 Sensor accordance with the Service Information and reconnect the harness connector. Refer to SENSOR, OXYGEN, REMOVAL AND INSTALLATION .
2. Connect all disconnected connectors.
3. With the scan tool, erase DTCs.
4. Using the recorded Freeze Frame Data and the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
5. With the scan tool, read DTCs.
  Did the DTC return?
  
  Yes
  - Go To 5
  No
  - Replacing the Intake O2 Sensor repaired the fault.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
CHECK RELATED PCM AND COMPONENT CONNECTIONS
1. Perform any Service Bulletins that apply.
2. Disconnect all PCM harness connectors.
3. Disconnect all related in-line harness connections (if equipped).
4. Disconnect the related component harness connectors.
5. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
  - Proper connector installation.
  - Damaged connector locks.
  - Corrosion.
  - Other signs of water intrusion.
  - Weather seal damage (if equipped).
  - Bent terminals.
  - Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
  - Terminals that have been pushed back into the connector cavity.
  - Check for spread terminals and verify proper terminal tension.
  Repair any conditions that are found.
6. Reconnect all PCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
7. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
8. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
9. With the scan tool, erase DTCs.
10. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
11. With the scan tool, read DTCs.
  Did the DTC return?
  
  Yes
  - Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information. Refer to MODULE, POWERTRAIN CONTROL (PCM), REMOVAL AND INSTALLATION .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  - Test complete.