Lincoln Town Car User Manual

1999 – 2002 Town Car EATC Self Test (FLM Service Manual Procedure)

Electronic Automatic Temperature Control Module Self-Test Procedure

The EATC module self-test will not detect concerns associated with data link messages like
engine coolant temperature or vehicle speed signals. A NGS tester must be used to retrieve these
concerns.

The EATC module self-test will detect concerns in the system control functions and will display
hard diagnostic trouble codes (DTCs) hard DTC's identify faults which are present during self test.
The vehicle interior temperature should be between 4º-32ºC (40-90ºF) when carrying out the self-test.
If the temperatures are not within the specified ranges, false in-car temperature sensor DTCs will be
displayed.

The self-test can be initiated at any time. Normal operation of the system stops when the self­test is activated.

To enter the self-test, press the OFF and FLOOR buttons simultaneously and then press the
AUTOMATIC button within two seconds. The display will show a pulse tracer going around the center
of the display window. The test may run as long as 30 seconds. Record all DTCs displayed.

If any DTCs appear during the self-test, follow the diagnostics procedure given under ACTION
for each DTC given.

If a condition exists but no DTCs appear during the self-test, refer to the Symptom Chart
Condition: The EATC System Is Inoperative, Intermittent or Improper Operation.

To exit the self-test and clear all DTCs, press the DEFROST button. The vacuum fluorescent
display window will show 888 and all function symbols for one second. Then, the EATC control
assembly will turn OFF (display blank) and all DTCs will be cleared.

Always exit the self-test before powering the system down (system turned OFF).

Electronic Automatic Temperature Control of Continuous Codes

This function will display intermittent and hard faults that occur during normal operation.
Display continuous codes can be initiated at any time. Normal operation of the system stops

when display continuous codes is activated. Note that "º C" will be displayed while in this mode.
To enter continuous display, press the OFF and PANEL buttons simultaneously and then

release and within two seconds press the AUTO button.
To exit continuous displays, press FRONT DEFROST. This will exit and clear all DTCs. Press

the floor button to exit without clearing DTCs set before the last ignition cycle.
Always exit continuous display before powering the system down (system turned off).
Intermittent DTCs are saved only after an ignition cycle.

Intermittent DTCs will be deleted after 80 ignition switch ON cycles after the intermittent
condition occurs.

Electronic Automatic Temperature Control DTC and EATC Codes