Vehicle applicability: This diagnostic supplement covers multiple Ford vehicles and engines. Follow the application named in the source below. Some references apply to vehicles other than Mustang.
AA: Auto Start Stop
AA: Introduction
AA1 CHECK FOR DTCS
• Carry out the PCM self-test.
• Check for any other module DTCs.
Are any DTCs other than DTC P164C present?
Yes | No |
|---|---|
For PCM DTCs, GO to Section 4, Diagnostic Trouble Code (DTC) Charts and Descriptions. For all other module DTCs, REFER to the applicable Workshop Manual Section to continue diagnosis. | GO to AA2 . |
AA2 CHECK FOR CORRECT AUTO START STOP SYSTEM OPERATION
Note: Verify the conditions that disable the auto start stop system operation are not present while checking the auto start stop system for correct operation. Refer to Section 1, Powertrain Control Software, Auto Start Stop.
Note: When the auto start stop system shuts the engine off, an indicator illuminates in the instrument panel cluster (IPC). Any other engine off conditions should be considered an engine stall.
Note: When the auto start stop system is inhibited, the On Demand Screen indicates why the engine is not turning off.
• Place the gear selector in DRIVE and drive the vehicle over 4 km/h (2.5 mph) until the engine operating temperature is greater than 60°C (140°F).
• Bring the vehicle to a complete stop with the brake pedal fully applied for greater than 5 seconds.
• Monitor the instrument panel cluster and engine for auto start stop shut down.
• After the engine is shut down, release the brake pedal.
• Verify the engine restarts.
Does the engine shut down while stopped and restart when the brake pedal is released?
Yes | No |
|---|---|
The system is operating correctly at this time. | GO to AA3 . |
AA3 MONITOR ALL THE AUTO START STOP PIDS
• Ignition ON, engine OFF.
• Access the PCM and monitor all the start stop PIDs. Select the START STOP option from the scan tool POWERTRAIN menu (if equipped).
• Check the PIDs for indications the auto start stop system is disabled or inhibited.
2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.