Diagnostic Test

READ AND RECORD DTCS AND ENVIRONMENTAL DATA - ERASE DTCS AND CHECK FOR DTC TO RETURN
1. With the scan tool, read DTCs in all Electronic Control Units (ECUs) and record on the repair order.
2. With the scan tool, run a vehicle Scan Report, or record the Environmental Data related to the DTCs.
3. With the scan tool, erase all DTCs.
4. Turn the ignition off for a minimum of 10 seconds.
5. Turn the ignition on.
6. Using the recorded Environmental Data and the When Monitored Conditions above, 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 appropriate INTERMITTENT CONDITION diagnostic procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .
CHECK FREQUENCY COUNTER IN ENVIRONMENTAL DATA
1. Refer to the saved DTC information recorded on the repair order.
  Was the Frequency Counter for this DTC greater than or equal to 3?
  
  Yes
  - Replace the Adaptive Cruise Control (ACC) Module in accordance with the Service Information. Refer to MODULE, ADAPTIVE CRUISE CONTROL (ACC), REMOVAL .
  - Perform the ADAPTIVE CRUISE CONTROL (ACC) VERIFICATION TEST. Refer to ADAPTIVE CRUISE CONTROL (ACC) VERIFICATION TEST .
  No
  - Go To 3
MOVE VEHICLE TO A COOLER ENVIRONMENT AND ALLOW THE TEMPERATURE TO STABILIZE - ERASE DTCS AND CHECK FOR DTC TO RETURN
1. Move the vehicle to a cooler environment and allow the temperature to stabilize.
2. Perform the following sequence three times:
  - With the scan tool, erase DTCs.
  - Turn the ignition off for at least 10 seconds.
  - Turn the ignition on.
  - Wait at least 70 seconds.
3. With the scan tool, read ACC DTCs.
  Did the DTC return?
  
  Yes
  - Go To 4
  No
  - Test complete.
  - Perform the ADAPTIVE CRUISE CONTROL (ACC) VERIFICATION TEST. Refer to ADAPTIVE CRUISE CONTROL (ACC) VERIFICATION TEST .
CHECK RELATED HARNESS CONNECTIONS
1. Turn the ignition off.
2. Disconnect all ACC 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.
  - Perform a terminal drag test on each connector terminal to verify proper terminal tension.
  Repair any conditions that are found.
6. Reconnect all ACC 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. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
11. With the scan tool, read ACC DTCs.
  Did the DTC return?
  
  Yes
  - Replace the Adaptive Cruise Control (ACC) Module in accordance with the Service Information. Refer to MODULE, ADAPTIVE CRUISE CONTROL (ACC), REMOVAL .
  - Perform the ADAPTIVE CRUISE CONTROL (ACC) VERIFICATION TEST. Refer to ADAPTIVE CRUISE CONTROL (ACC) VERIFICATION TEST .
  No
  - Repairing the wiring or the connectors corrected the condition.
  - Perform the ADAPTIVE CRUISE CONTROL (ACC) VERIFICATION TEST. Refer to ADAPTIVE CRUISE CONTROL (ACC) VERIFICATION TEST .