Displaying and Reading Diagnostic Trouble Codes

NOTE: Ford DOES NOT provide a procedure to retrieve or clear trouble codes. Code retrieval is integrated into the EATC Module Self-Test. Ford DOES NOT provide an alternate procedure for performing the Self-Test with an NGS or generic tester.

Fig. 3 Error Codes:

The control assembly (head) detects certain system faults during normal operation and is capable of testing for other faults during the self-test mode. If an actuator malfunction is detected during normal operation, the Vacuum Fluorescent Display (VFD) or Light Emitting Diode (LED) will blink.
When a malfunction is detected, the error code(s) may be displayed by simultaneously depressing the OFF/AUTO and DEFROST buttons, then press the A/C button to enter the self-test mode. Error codes found during the self-test mode will be displayed along with any faults found during normal operation. Activation of self-test mode will stop normal operation of the system. To exit self test mode and restart system, press the COOL button.
Refer to error codes, Fig. 3 and pinpoint tests A through G, to diagnose any displayed error codes. If a malfunction exists, but no error code is displayed, refer to pinpoint tests H through P. Displayed error codes must be considered invalid if in-vehicle temperature is 50°F or less.

1. Turn ignition off, then back on to reset the system.
2. Ensure engine coolant temperature is at least 120°F.
3. Set control head to Auto/90°F. Wait a minimum of 40 seconds, then verify the following conditions:
a. System goes to high blower and warm air is being discharged from floor.
b. Recirc door is in "outside air" position.
c. Warm air is bleeding out of defroster nozzle.
4. Enter "self-test", then record all faults and error codes displayed. Exit "self-test" and diagnose error code(s).
5. Set control head to Auto/60°F. Wait a minimum of 40 seconds, then verify the following conditions:
a. Cool air is being discharged from panel.
b. Recirc door is in "recirc" position.
6. Enter "self-test", then record all faults and error codes displayed. Exit "self-test" and diagnose error code(s).
7. Repeat steps 3 and 4.
8. Perform pinpoint tests H through P, if any other faults still exist. When diagnosing a vehicle at idle, the system will likely discharge cool air from the panel up to an "85°" set point due to engine heat acting on the ambient sensor. Because of this, the vehicle should be road tested as a final checkout.