Diagnostic Test

WARNING: This page is about a different car, the 2017 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR AN ACTIVE DTC
1. Turn the ignition on.
2. 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. Refer to INTERMITTENT CONDITION .
DETERMINE IF THE BODY CONTROL MODULE IS CAPABLE OF SETTING AAT SENSOR DTCS
1. Check the BCM fault code list to verify that the BCM has the capability to set DTCs against the AAT Sensor. Refer to BODY CONTROL MODULE (BCM) - DIAGNOSTIC CODE INDEX .
  Are there any AAT Sensor faults listed in the DTC list for the BCM?
  
  Yes
  - Go To 3
  No
  - Go To 4
CHECK THE BODY CONTROL MODULE FOR AAT SENSOR DTCS
1. With the scan tool, read DTCs in the BCM.
  Are there any AAT Sensor DTCs set in the BCM?
  
  Yes
  - Perform the applicable diagnostic procedure(s). Refer to BODY CONTROL MODULE (BCM) - DIAGNOSTIC CODE INDEX .
  No
  - Replace and program the Body Control Module (BCM) in accordance with the Service Information. Refer to MODULE, BODY CONTROL (BCM), REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE AAT SENSOR CIRCUITS FOR AN OPEN OR SHORTS
1. Turn the ignition off.
2. Disconnect the AAT Sensor harness connector.
3. Disconnect the appropriate BCM harness connector.
4. Check the AAT Sensor circuits for the following:
  - Open circuit.
  - Short to voltage.
  - Short to ground.
  - Short to another circuit.
  Were any ATT Sensor circuits open or shorted?
  
  Yes
  - Repair the AAT Sensor circuit(s) for an open or short.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST, 3.2L .
  No
  - Go To 5
REPLACE THE AAT SENSOR AND RETEST FOR DTC
1. Replace the AAT Sensor in accordance with the Service Information.
2. Connect the AAT Sensor and BCM harness connectors.
3. Turn the ignition on.
4. With the scan tool, erase DTCs.
5. Using the Freeze Frame Data or When Monitored Conditions above, operate the vehicle within the conditions that set the DTC.
6. With the scan tool, read DTCs.
  Did the DTC return?
  
  Yes
  - Go To 6
  No
  - Replacing the Ambient Air Temperature Sensor repaired the fault.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST, 3.2L .
CHECK RELATED HARNESS CONNECTIONS
1. Disconnect all BCM 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. Reconnect all BCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
6. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
7. Reconnect 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 the BCM in accordance with the Service Information. Refer to MODULE, BODY CONTROL (BCM), REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - The wiring or poor connection problem has been repaired.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .