Diagnostic Test

WARNING: This page is about a different variant/trim than selected.

READ AND RECORD DTCS AND ENVIRONMENTAL DATA - ERASE DTCS AND CHECK FOR THE DTC TO RETURN
1. With the scan tool, read DTCs in all Electronic Control Units (ECUs) and record on the repair order.
2. For future reference, run and save a vehicle Scan Report and all related recorded data.
3. With the scan tool, erase all DTCs.
4. Turn the ignition off for a minimum of 10.0 seconds.
5. Turn the ignition on.
6. Using the When Monitored and Set Conditions above and recorded data, operate the vehicle in the conditions that set the DTC.
7. With the scan tool, read DTCs.
  Did the DTC return?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT DTC .
CHECK FOR OTHER DTCS
1. Refer to the recorded DTCs.
  Are there any 5-Volt Supply DTCs active or pending?
  
  Yes
  - Perform the applicable diagnostic procedure(s). Refer to DTC INDEX (1 OF 2) and/or DTC INDEX (2 OF 2) .
  No
  - Go To 3
CHECK THE HUMIDITY SENSOR (K648) SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE
1. Turn the engine off.
2. Disconnect the MAF/Intake Air Sensor harness connector.
3. Turn the ignition on, engine off.
4. Measure the voltage on the Humidity Sensor (K648) Signal circuit at the MAF/Intake Air Sensor harness connector.
  Is the voltage above 5.2 volts?
  
  Yes
  - Repair the Humidity Sensor (K648) Signal circuit for a short to voltage.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.0L, POWERTRAIN VERIFICATION TEST .
  No
  - Go To 4
CHECK THE HUMIDITY SENSOR (K648) SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Turn the engine off.
2. Disconnect the PCM C1 harness connector.
3. Measure the resistance of the Humidity Sensor (K648) Signal circuit between the MAF/Intake Air Sensor harness connector and the PCM C1 harness connector.
  Is the resistance above 3.0 Ohms?
  
  Yes
  - Repair the Humidity Sensor (K648) Signal circuit for an open/high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.0L, POWERTRAIN VERIFICATION TEST .
  No
  - Go To 5
CHECK THE ABILITY OF THE PCM TO MONITOR THE MAF/ HUMIDITY SENSOR FOR PROPER OPERATION
1. Turn the ignition off for at least 10 seconds.
2. Turn the ignition on.
3. With the scan tool check for PCM DTCs.
  NOTE:
  With the connector unplugged the scan tool should display P00F5-00-HUMIDITY SENSOR CIRCUIT HIGH.
4. While monitoring the scan tool, connect a jumper between the Intake Air Humidity Sensor (K648) Signal circuit and the Sensor (K757) Ground circuit in the MAF/Intake harness connector.
  NOTE:
  With the jumper in place the scan tool should display P00F4-00-HUMIDITY SENSOR CIRCUIT LOW.
  
  Did the DTCs display as described above?
  
  Yes
  - Go To 6
  No
  - Replace the MAF/ Humidity Sensor in accordance with the Service Information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.0L, POWERTRAIN VERIFICATION TEST .
CHECK RELATED PCM AND COMPONENT CONNECTIONS
1. Disconnect all PCM harness connectors.
2. Disconnect all related in-line harness connections (if equipped).
3. Disconnect the related component harness connectors.
4. 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.
5. Connect all PCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
6. Connect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
7. Connect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
8. With the scan tool, erase DTCs.
9. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
10. 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.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.0L, POWERTRAIN VERIFICATION TEST .
  No
  - Repair the poor connections.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to 3.0L, POWERTRAIN VERIFICATION TEST .