Page 1
«2001 Town Car Table of Contents»
«Group 4: Electrical»
«Section 412-00: CLIMATE CONTROL SYSTEM — GENERAL INFORMATION»
«DIAGNOSIS AND TESTING»
Climate Control System
PINPOINT TEST I: THE EATC SYSTEM IS INOPERATIVE, INTERMITTENT OR INCORRECT
OPERATION
I1 CARRY OUT THE EATC MODULE CONTINUOUS CODE DISPLAY
1
2 Carry out the display of EATC module continuous codes. Refer to Electronic Automatic Temperature
Control Module — Display Continuous Codes in this section. Record the DTCs displayed, if any.
Were any DTCs displayed as a result of the EATC display of continuous codes?
Yes
REFER to the EATC Module Diagnostic Trouble Code (DTC) Index. CARRY OUT the necessary
diagnosis and REPAIR as required.
No
Go to «I2».
Page 2
«2001 Town Car Table of Contents»
«Group 4: Electrical»
«Section 412-00: CLIMATE CONTROL SYSTEM — GENERAL INFORMATION»
«DIAGNOSIS AND TESTING»
Climate Control System
PINPOINT TEST I: THE EATC SYSTEM IS INOPERATIVE, INTERMITTENT OR INCORRECT
OPERATION
I2 CHECK THE VACUUM FLUORESCENT DISPLAY
1
Exit the display of continuous codes by pressing the FRONT DEFROST button. Observe the function
symbols displayed on the vacuum fluorescent display.
Is the display correct and complete without any missing elements?
Yes
Go to «I3».
No
INSTALL a new EATC module. TEST the system for normal operation.
Page 3
«2001 Town Car Table of Contents»
«Group 4: Electrical»
«Section 412-00: CLIMATE CONTROL SYSTEM — GENERAL INFORMATION»
«DIAGNOSIS AND TESTING»
Climate Control System
PINPOINT TEST I: THE EATC SYSTEM IS INOPERATIVE, INTERMITTENT OR INCORRECT
OPERATION
I3 VERIFY AUTOMATIC OPERATION
1
2 Press the AUTO button on the EATC module.
Does AUTO and the selected temperature appear in the display window?
Yes
Go to «I4».
No
Go to «Pinpoint Test R».
Page 4
«2001 Town Car Table of Contents»
«Group 4: Electrical»
«Section 412-00: CLIMATE CONTROL SYSTEM — GENERAL INFORMATION»
«DIAGNOSIS AND TESTING»
Climate Control System
PINPOINT TEST I: THE EATC SYSTEM IS INOPERATIVE, INTERMITTENT OR INCORRECT
OPERATION
I4 CHECK THE BLOWER MANUAL OVERRIDE OPERATION
1 Press the blower motor speed manual override button fully up and down.
Does the blower motor go from high to low speed and does the bar graph display vary
with the blower speed?
Go to «I5».
No
Yes
Go to «Pinpoint Test Q».
Page 5
«2001 Town Car Table of Contents»
«Group 4: Electrical»
«Section 412-00: CLIMATE CONTROL SYSTEM — GENERAL INFORMATION»
«DIAGNOSIS AND TESTING»
Climate Control System
PINPOINT TEST I: THE EATC SYSTEM IS INOPERATIVE, INTERMITTENT OR INCORRECT
OPERATION
I5 VERIFY THE FRONT DEFROST OVERRIDE OPERATION
1 Press the FRONT DEFROST manual override button.
Is outside air being discharged from the windshield defroster nozzle and the side window
demisters?
Go to «I6».
No
Yes
Go to «Pinpoint Test J».
Page 6
«2001 Town Car Table of Contents»
«Group 4: Electrical»
«Section 412-00: CLIMATE CONTROL SYSTEM — GENERAL INFORMATION»
«DIAGNOSIS AND TESTING»
Climate Control System
PINPOINT TEST I: THE EATC SYSTEM IS INOPERATIVE, INTERMITTENT OR INCORRECT
OPERATION
I6 VERIFY THE FLOOR/DEFROST OVERRIDE OPERATION
1 Press the FLOOR/DEFROST manual override button.
Is outside air being discharged from the floor duct, the windshield defroster nozzle, and
the side window demisters?
Go to «I7».
No
Yes
Go to «Pinpoint Test J».
Page 7
«2001 Town Car Table of Contents»
«Group 4: Electrical»
«Section 412-00: CLIMATE CONTROL SYSTEM — GENERAL INFORMATION»
«DIAGNOSIS AND TESTING»
Climate Control System
PINPOINT TEST I: THE EATC SYSTEM IS INOPERATIVE, INTERMITTENT OR INCORRECT
OPERATION
I7 VERIFY THE FLOOR OVERRIDE OPERATION
1 Press the FLOOR manual override button.
Is outside air being discharged from the floor duct?
Go to «I8».
No
Yes
Go to «Pinpoint Test J».
Page 8
«2001 Town Car Table of Contents»
«Group 4: Electrical»
«Section 412-00: CLIMATE CONTROL SYSTEM — GENERAL INFORMATION»
«DIAGNOSIS AND TESTING»
Climate Control System
PINPOINT TEST I: THE EATC SYSTEM IS INOPERATIVE, INTERMITTENT OR INCORRECT
OPERATION
I8 VERIFY THE FLOOR/VENT OVERRIDE OPERATION
1 Press the FLOOR/VENT manual override button.
Is outside air being discharged from the floor duct and the instrument panel registers?
Go to «I9».
No
Yes
Go to «Pinpoint Test J».
Page 9
«2001 Town Car Table of Contents»
«Group 4: Electrical»
«Section 412-00: CLIMATE CONTROL SYSTEM — GENERAL INFORMATION»
«DIAGNOSIS AND TESTING»
Climate Control System
PINPOINT TEST I: THE EATC SYSTEM IS INOPERATIVE, INTERMITTENT OR INCORRECT
OPERATION
I9 VERIFY THE VENT OVERRIDE OPERATION
1 Press the VENT manual override button.
Is outside air being discharged from the instrument panel registers?
Go to «I10».
No
Yes
Go to «Pinpoint Test J».
Page 10
«2001 Town Car Table of Contents»
«Group 4: Electrical»
«Section 412-00: CLIMATE CONTROL SYSTEM — GENERAL INFORMATION»
«DIAGNOSIS AND TESTING»
Climate Control System
PINPOINT TEST I: THE EATC SYSTEM IS INOPERATIVE, INTERMITTENT OR INCORRECT
OPERATION
I10 VERIFY THE A/C CLUTCH DOES NOT ENGAGE IN THE VENT MODE
1 Note:
The ambient temperature must be over 5º C (41º F).
Check for A/C compressor operation.
Is the A/C compressor clutch engaged?
REFER to the «Powertrain Control/Emissions Diagnosis Manual».
No
Yes
Go to «I11».
Page 11
«2001 Town Car Table of Contents»
«Group 4: Electrical»
«Section 412-00: CLIMATE CONTROL SYSTEM — GENERAL INFORMATION»
«DIAGNOSIS AND TESTING»
Climate Control System
PINPOINT TEST I: THE EATC SYSTEM IS INOPERATIVE, INTERMITTENT OR INCORRECT
OPERATION
I11 VERIFY THE MAX A/C OVERRIDE OPERATION
1 Press the MAX A/C manual override button.
Is recirculated air being discharged from the instrument panel registers?
Go to «I12».
No
Yes
Go to «Pinpoint Test J».
Page 12
«2001 Town Car Table of Contents»
«Group 4: Electrical»
«Section 412-00: CLIMATE CONTROL SYSTEM — GENERAL INFORMATION»
«DIAGNOSIS AND TESTING»
Climate Control System
PINPOINT TEST I: THE EATC SYSTEM IS INOPERATIVE, INTERMITTENT OR INCORRECT
OPERATION
I12 VERIFY A/C CLUTCH ENGAGEMENT IN THE MAX A/C MODE
1 Note:
The ambient temperature must be over 5º C (41º F).
Check for A/C compressor operation.
Is the A/C compressor clutch engaged?
Go to «I13».
No
Yes
Go to «Pinpoint Test L».
Page 13
«2001 Town Car Table of Contents»
«Group 4: Electrical»
«Section 412-00: CLIMATE CONTROL SYSTEM — GENERAL INFORMATION»
«DIAGNOSIS AND TESTING»
Climate Control System
PINPOINT TEST I: THE EATC SYSTEM IS INOPERATIVE, INTERMITTENT OR INCORRECT
OPERATION
I13 VERIFY REAR DEFROST OPERATION
1 Press the REAR DEFROST button.
Does the indicator illuminate and does the rear window defrost?
The test is complete. The system is functioning normally.
No
Yes
GO to «Section 501-11».
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