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Is the resistance between 250 and 5,500 ohms?

F5 CHECK CIRCUITS 438 (RD/WH), 1123 (YE/WH) AND 1130 (PK/LG) FOR A

SHORT TO VOLTAGE

Ignition ON.

Measure the voltage between ground and:

HVAC module C228a-20, circuit 438 (RD/WH), harness side.

For DTC B1263

, HVAC module C228b-15, circuit 1123 (YE/WH), harness

side.

For DTC B1264

, HVAC module C228b-14, circuit 1130 (PK/LG), harness

side.

Is any voltage present?

Yes

REPAIR circuit 438 (RD/WH), 1123 (YE/WH) or 1130 (PK/LG) for a short to voltage.
CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

No

GO to

F6

.

F6 CHECK CIRCUITS 436 (RD/LG), 1123 (YE/WH) AND 1130 (PK/LG) FOR A

SHORT TO GROUND

Ignition OFF.

Measure the resistance between ground and:

HVAC module C228b-8, circuit 436 (RD/LG), harness side.

For DTC B1263, HVAC module C228b-15, circuit 1123 (YE/WH), harness
side.

For DTC B1264, HVAC module C228b-14, circuit 1130 (PK/LG), harness
side.

Is the resistance greater than 10,000 ohms?

Yes

If diagnosing

DTC B1263

, GO to

F7

.

If diagnosing

DTC B1264

, GO to

F8

.

No

REPAIR circuits 436 (RD/LG), 1123 (YE/WH) or 1130 (PK/LG) for a short to ground.
CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

F7 CHECK THE DOOR ACTUATOR OPERATION

NOTE:

If a jumper fuse opens while carrying out this test step, repair the circuit

(s) for a short.

With the fused jumper connections made as directed below, measure the
resistance between HVAC module C228a-20, circuit 438 (RD/WH), harness side
and HVAC module C228b-15, circuit 1123 (YE/WH), harness side.

Connect a fused jumper wire between:

HVAC module C228a-25, circuit 1380 (TN/YE), harness side and HVAC
module C228b-11, circuit 1566 (RD/YE), harness side.

HVAC module C228a-24, circuit 1379 (PK/LB), harness side and HVAC
module C228a-2, circuit 57 (BK), harness side.

Yes

INSPECT for broken door and linkage. REPAIR as necessary. If no condition is found,
GO to

F11

.

No

GO to

F9

.

Page 22 of 45

2006 Town Car Workshop Manual

12/30/2011

http://www.fordtechservice.dealerconnection.com/pubs/content/~WS6G/~MUS~LEN/19/...

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Содержание 2006 Town Car

Страница 1: ...76 R032A or equivalent Refrigerant Leak Detector 216 00001 or equivalent Set A C Fittings 412 DS028 014 00333 D93L 19703 B or equivalent Test Light SGT27000 or equivalent 250 mA incandescent bulb test lamp Vacuum Pump Kit 416 D002 D95L 7559 A or equivalent Worldwide Diagnostic System WDS Vehicle Communication Module VCM with appropriate adapters or equivalent diagnostic tool Mechanical Electrical ...

Страница 2: ... the OFF and FLOOR buttons simultaneously and then press the AUTO button within 2 seconds The display will show the fan speed indicator illuminating from low to high 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 t...

Страница 3: ...liary control switch circuit short to ground GO to Pinpoint Test G U1040 1040 SCP invalid or missing data for function read vehicle speed If DTCs are present in the instrument cluster diagnose those codes first CLEAR the DTCs If the EATC DTC returns INSTALL a new EATC module REFER to Section 412 01 If no DTCs are present in the instrument cluster CLEAR the DTCs If the EATC DTC returns INSTALL a ne...

Страница 4: ...harge A C compressor clutch A C pressure transducer EATC module PCM GO to Pinpoint Test K The air conditioning A C is always on Circuitry short or open EATC module A C clutch relay A C compressor clutch A C evaporator core temperature sensor GO to Pinpoint Test L The blower motor is inoperative Fuse s Circuitry open or shorted Blower motor Blower motor speed control Blower motor relay GO to Pinpoi...

Страница 5: ...mal operation If the high side resistance only is less than 250 ohms REPAIR circuits 437 YE LG and 436 RD LG for a short together CLEAR the DTCs REPEAT the self test TEST the system for normal operation If the high side and low side resistance is greater than 5 500 ohms REPAIR circuit 437 YE LG for an open CLEAR the DTCs REPEAT the self test TEST the system for normal operation A3 CHECK POTENTIOME...

Страница 6: ...267 HVAC module C228b 5 circuit 1122 RD harness side Is any voltage present Yes REPAIR circuit s for a short to voltage CLEAR the DTCs REPEAT the self test TEST the system for normal operation No For DTC B2266 GO to A6 For DTC B2267 GO to A7 A6 CHECK THE BLEND DOOR ACTUATOR OPERATION NOTE If a jumper fuse opens while carrying out this test step repair the circuit s for a short Ignition ON Measure ...

Страница 7: ...0 circuit 438 RD WH harness side While observing the resistance connect a fused jumper wire between HVAC module C228a 12 circuit 1125 BN harness side and HVAC module C228b 11 circuit 1566 RD YE harness side HVAC module C228a 11 circuit 1124 WH harness side and HVAC module C228a 2 circuit 57 BK harness side Remove the fused jumpers when the resistance does not change Connect a fused jumper wire bet...

Страница 8: ...ture blend door actuator C2091 6 circuit 245 BN LG harness side DTC B2266 NOTE For DTC B2266 only Measure the resistance between HVAC module C228a 13 circuit 246 VT harness side and the LH temperature blend door actuator C2091 1 circuit 246 VT harness side DTC B2267 NOTE For DTC B2267 only Measure the resistance between HVAC module C228a 12 circuit 1125 BN harness side and the RH temperature blend...

Страница 9: ... module REFER to Section 412 01 TEST the system for normal operation No The system is operating correctly at this time The concern may have been caused by a loose or corroded connector CLEAR the DTCs REPEAT the self test TEST the system for normal operation Test Step Result Action to Take B1 CHECK THE SENSOR RESISTANCE Ignition OFF Disconnect In Vehicle Temperature Sensor C233 Measure the resistan...

Страница 10: ...e self test TEST the system for normal operation B5 CHECK CIRCUIT 3058 LG RD FOR A SHORT TO CIRCUIT 3059 YE LG Ignition OFF Disconnect EATC Module C228b Measure the resistance between in vehicle temperature sensor C233 1 circuit 3058 LG RD and C233 2 circuit 3059 YE LG Is the resistance greater than 10 000 ohms Yes GO to B6 No REPAIR circuit 3058 LG RD for a short to circuit 3059 YE LG CLEAR the D...

Страница 11: ...EPEAT the self test TEST the system for normal operation Test Step Result Action to Take C1 CHECK THE AMBIENT TEMPERATURE SENSOR RESISTANCE Ignition OFF Disconnect Ambient Temperature Sensor C132 Measure the resistance between the ambient temperature sensor terminals Is the resistance within the specified values for these temperature ranges 10 20 C 50 68 F 37 000 58 000 ohms 20 30 C 68 86 F 24 000...

Страница 12: ...ween ambient temperature sensor C132 1 circuit 3061 LB OG and C132 2 circuit 3059 YE LG Is the resistance greater than 10 000 ohms Yes GO to C6 No REPAIR circuit 3061 LB OG for a short to circuit 3059 YE LG CLEAR the DTCs REPEAT the self test TEST the system for normal operation C6 CHECK CIRCUIT 3061 LB OG FOR A SHORT TO GROUND Measure the resistance between EATC module C228 17 circuit 3061 LB OG ...

Страница 13: ...ON Press the AUTOMATIC button Measure the voltage between solar radiation sensor C287 1 circuit 468 BN and C287 2 circuit 676 PK OG Measure the voltage between solar radiation sensor C287 2 circuit 676 PK OG and C287 6 circuit 476 BN YE Are the voltages between 4 7 and 5 1 volts Yes GO to D7 No If diagnosing DTC 1259 GO to D3 If diagnosing DTC 1261 GO to D5 D3 CHECK CIRCUIT 468 BN AND CIRCUIT 476 ...

Страница 14: ...tion sensor C287 6 circuit 476 BN YE and C287 2 circuit 676 PK OG Are the resistances greater than 10 000 ohms Yes GO to D6 No REPAIR circuit 468 BN or 476 BN YE for a short to circuit 676 PK OG CLEAR the DTCs REPEAT the self test TEST the system for normal operation D6 CHECK CIRCUIT 468 BN AND CIRCUIT 476 BN YE FOR A SHORT TO GROUND Measure the resistance between solar radiation sensor C287 1 cir...

Страница 15: ...tronic Automatic Temperature Control EATC Module Cold Boot Process Carry out the EATC on demand self test Operate the system Does the concern return Yes INSTALL a new EATC module REFER to Section 412 01 TEST the system for normal operation No The system is operating correctly at this time The concern may have been caused by a loose or corroded connector CLEAR the DTCs REPEAT the self test TEST the...

Страница 16: ...ound CLEAR the DTCs REPEAT the self test TEST the system for normal operation E5 CHECK CIRCUIT 660 YE LG FOR A SHORT TO VOLTAGE Ignition ON Measure the voltage between ground and EATC module C228a 10 circuit 660 YE LG Is voltage present Yes REPAIR circuit 660 YE LG for a short to voltage CLEAR the DTCs REPEAT the self test TEST the system for normal operation No GO to E6 E6 CHECK CIRCUIT 1069 OG L...

Страница 17: ...Defrost Door Actuator C2248 Disconnect Floor Door Actuator C234 Measure the resistance between EATC module C228b 8 circuit 436 RD LG and EATC module C228a 20 circuit 438 RD WH Is the resistance between 5 000 and 6 000 ohms Yes GO to E10 No If the resistance is greater than 6 000 ohms GO to E12 If the resistance is less than 5 000 ohms GO to E19 E10 CHECK POTENTIOMETER LOW SIDE RESISTANCE Measure t...

Страница 18: ...R the DTCs REPEAT the self test TEST the system for normal operation E14 CHECK CIRCUIT 435 YE LB FOR AN OPEN Disconnect Recirc Door Actuator C289 Measure the resistance between EATC module C228b 3 circuit 435 YE LB and recirc door actuator C289 3 circuit 435 YE LB Is the resistance less than 5 ohms Yes INSTALL a new door actuator REFER to Section 412 01 CLEAR the DTCs REPEAT the self test TEST the...

Страница 19: ... E19 CHECK CIRCUIT 438 RD WH AND CIRCUIT 436 RD LG FOR A SHORT TOGETHER Disconnect Recirc Door Actuator C289 Measure the resistance between EATC module C228a 20 circuit 438 RD WH and EATC module C228b 8 circuit 436 RD LG Is the resistance less than 5 ohms Yes REPAIR circuits 438 RD WH and circuit 436 RD LG for a short together CLEAR the DTCs REPEAT the self test TEST the system for normal operatio...

Страница 20: ...NT TEST F DTC B1263 OR B1264 PANEL DEFROST OR FLOOR DOOR FAILURE Is the resistance less than 5 ohms E21 CHECK CIRCUIT 436 RD LG AND CIRCUIT 435 YE LB FOR A SHORT TOGETHER Measure the resistance between EATC module C228b 8 circuit 436 RD LG and EATC module C228b 3 circuit 435 YE LB Is the resistance less than 5 ohms Yes REPAIR circuits 436 RD LG and circuit 435 YE LB for a short together CLEAR the ...

Страница 21: ...than 250 ohms REPAIR circuits 1123 YE WH and 438 RD WH for a short together CLEAR the DTCs REPEAT the self test TEST the system for normal operation If the high side resistance only is greater than 5 500 ohms REPAIR circuit 436 RD LG for an open CLEAR the DTCs REPEAT the self test TEST the system for normal operation If the high side resistance only is less than 250 ohms REPAIR circuits 1123 YE WH...

Страница 22: ...resistance greater than 10 000 ohms Yes If diagnosing DTC B1263 GO to F7 If diagnosing DTC B1264 GO to F8 No REPAIR circuits 436 RD LG 1123 YE WH or 1130 PK LG for a short to ground CLEAR the DTCs REPEAT the self test TEST the system for normal operation F7 CHECK THE DOOR ACTUATOR OPERATION NOTE If a jumper fuse opens while carrying out this test step repair the circuit s for a short With the fuse...

Страница 23: ...ss side and HVAC module C228b 14 circuit 1130 PK LG harness side Connect a fused jumper wire between HVAC module C228a 23 circuit 1376 BK LB harness side and HVAC module C228b 11 circuit 1566 RD YE harness side HVAC module C228a 22 circuit 1375 PK YE harness side and HVAC module C228a 2 circuit 57 BK harness side Remove the fused jumpers Connect a fused jumper wire between HVAC module C228a 22 cir...

Страница 24: ...and panel defrost door actuator C2248 1 circuit 1379 PK LB harness side DTC B1263 NOTE For DTC B1263 only Measure the resistance between HVAC module C228a 25 circuit 1380 TN YE harness side and panel defrost door actuator C2248 6 circuit 1380 TN YE harness side DTC B1264 NOTE For DTC B1264 only Measure the resistance between HVAC module C228a 22 circuit 1375 PK YE harness side and floor door actua...

Страница 25: ...The concern may have been caused by a loose or corroded connector CLEAR the DTCs TEST the system for normal operation F11 MODULE ACTUATOR POSITION CALIBRATION NOTE The purpose of the module actuator position calibration is to allow the HVAC module to reinitialize and calibrate the actuator stop points To carry out the calibration follow the steps below Ignition OFF Inspect the module connectors fo...

Страница 26: ...ary control switch C2208 6 circuit 1070 BN LB Is the resistance less than 5 ohms Yes GO to G5 No REPAIR circuit 1070 BN LB for an open CLEAR the DTCs REPEAT the self test TEST the system for normal operation G5 CHECK CIRCUIT 57 BK FOR AN OPEN Measure the resistance between steering wheel auxiliary control switch C2208 3 circuit 57 BK and ground Is the resistance less than 5 ohms Yes INSTALL a new ...

Страница 27: ...on voltage through circuit 1812 BN WH Possible Causes Fuse s An open in circuit 57 BK 1566 RD YE or 1812 BN WH Test Step Result Action to Take H1 CHECK CIRCUIT 676 PK OG FOR AN OPEN Ignition OFF Disconnect EATC Module C228a Measure the resistance between EATC module C228a 2 circuit 676 PK OG and ground Is the resistance less than 5 ohms Yes GO to H2 No REPAIR circuit 676 PK OG for an open TEST the...

Страница 28: ...s GO to I6 No GO to Pinpoint Test F I6 VERIFY THE FLOOR OVERRIDE OPERATION Press the override button for FLOOR operation Is outside air being discharged from the floor duct Yes GO to I7 No GO to Pinpoint Test F I7 VERIFY THE PANEL OVERRIDE OPERATION Press the override button for PANEL operation Is outside air being discharged from the instrument panel registers Yes GO to I8 No GO to Pinpoint Test ...

Страница 29: ...TC module REFER to Section 412 01 TEST the system for normal operation No The system is operating correctly at this time The concern may have been caused by a loose or corroded connector CLEAR the DTCs REPEAT the self test TEST the system for normal operation Test Step Result Action to Take J1 CHECK FOR CORRECT ENGINE COOLANT LEVEL Ignition OFF Check the engine coolant level when hot and when cold...

Страница 30: ...tect excessively high engine coolant temperature The PCM does not detect an ambient air temperature too low The PCM has not detected a Wide Open Throttle WOT condition Possible Causes Fuse s Wiring terminals or connectors A C pressure transducer PCM A C clutch relay Electronic automatic temperature control EATC module A C cycling switch A C compressor clutch field coil A C clutch air gap PINPOINT ...

Страница 31: ...ECK CYCLING SWITCH VOLTAGE Ignition OFF Disconnect A C Cycling Switch C1081 Ignition ON Measure the voltage between cycling switch C1081 4 circuit 348 VT 1040 RD BK and ground Is the voltage greater than 10 volts Yes GO to K6 No VERIFY the central junction box CJB fuse 31 10A is OK If OK REPAIR circuit 348 VT 1040 RD BK for an open TEST the system for normal operation K6 CHECK CYCLING SWITCH Ignit...

Страница 32: ...R VOLTAGE Ignition OFF Disconnect A C Clutch Relay Ignition ON Measure the voltage between A C clutch relay socket pin 2 circuit 391 RD YE and ground Is the voltage greater than 10 volts Yes GO to K12 No VERIFY the battery junction box BJB fuse 21 15A is OK If OK REPAIR circuit 391 RD YE for an open TEST the system for normal operation K12 CHECK THE RELAY OUTPUT FROM THE PCM NOTICE The following s...

Страница 33: ...cuit 321 GY WH and A C compressor clutch field coil C100 1 circuit 321 GY WH Is the resistance less than 5 ohms Yes INSTALL a new A C clutch relay TEST the system for normal operation No REPAIR circuit 321 GY WH for an open TEST the system for normal operation K15 CHECK CIRCUIT 73 OG LB FOR AN OPEN Ignition OFF Disconnect PCM C175B Measure the resistance between A C clutch relay socket pin 1 circu...

Страница 34: ...ing switch The PCM does not detect excessively high engine coolant temperature The PCM does not detect an ambient air temperature too low The PCM has not detected a Wide Open Throttle WOT condition Possible Causes Wiring terminals or connectors A C pressure transducer PCM A C clutch relay Electronic automatic temperature control EATC module A C clutch air gap PINPOINT TEST L THE AIR CONDITIONING A...

Страница 35: ...100 1 circuit 321 GY WH and ground Is the voltage greater than 10 volts Yes GO to L5 No ADJUST the A C compressor clutch gap REFER to Air Conditioning A C Clutch Air Gap Adjustment in this section TEST the system for normal operation L5 CHECK CIRCUIT 321 GY WH FOR A SHORT TO VOLTAGE Ignition OFF Disconnect A C Clutch Relay Ignition ON Measure the voltage between A C compressor clutch field coil C1...

Страница 36: ...TOR OPERATION Ignition ON Press the PANEL button on the EATC module Adjust the blower motor setting to LO and then to HI Is the blower motor inoperative in all settings Yes GO to M2 No GO to Pinpoint Test N M2 CHECK FOR VOLTAGE TO THE BLOWER MOTOR Ignition OFF Disconnect Blower Motor C1031 Ignition ON Measure the voltage between blower motor C1031 1 circuit 371 PK WH and ground Is the voltage grea...

Страница 37: ...ed control C1308 3 circuit 754 LG WH and measure the resistance between EATC module C228a 8 circuit 754 LG WH and ground Is the resistance less than 5 ohms between the EATC module and the blower motor speed control and greater than 10 000 ohms between the EATC module and ground Yes INSTALL a new blower motor speed control TEST the system for normal operation No REPAIR circuit 754 LG WH TEST the sy...

Страница 38: ... 364 BK LG and ground Is voltage present Yes REPAIR circuit 364 BK LG for a short to voltage TEST the system for normal operation No GO to M12 M12 CHECK CIRCUIT 364 BK LG FOR AN OPEN Ignition OFF Measure the resistance between EATC module C228b 9 circuit 364 BK LG and blower motor relay socket pin 85 circuit 364 BK LG Is the resistance less than 5 ohms Yes GO to M13 No REPAIR circuit 364 BK LG for...

Страница 39: ...O and then to HI Does the blower motor operate Yes REPAIR circuit 515 OG RD for a short to ground TEST the system for normal operation No GO to N2 N2 CHECK THE BLOWER MOTOR SPEED CONTROL Ignition OFF Connect Blower Motor Speed Control C1308 Disconnect EATC Module C228a Disconnect Blower Motor Relay Connect a fused jumper wire between blower motor relay socket pin 30 circuit 181 BN OG and pin 87 ci...

Страница 40: ...re the resistances greater than 10 000 ohms Yes GO to N7 No REPAIR the affected circuits for a short together TEST the system for normal operation N7 CHECK THE EATC MODULE HIGH BLOWER OUTPUT Connect EATC C228a Connect Blower Motor Speed Control C1308 Ignition ON Adjust the blower motor speed to HI Measure the voltage between EATC module C228a 8 circuit 754 LG WH and ground by back probing the EATC...

Страница 41: ...AR the DTCs REPEAT the self test TEST the system for normal operation Test Step Result Action to Take O1 CHECK CIRCUIT 1349 PK LG FOR GROUND Ignition OFF Disconnect Rear Redundant Control Module RRCM C3160a Measure the resistance between RRCM C3160a 4 pin 4 circuit 1349 PK LG and ground Is the resistance greater than 10 000 ohms Yes GO to O2 No GO to O3 O2 CHECK CIRCUIT 1349 PK LG FOR A SHORT TO G...

Страница 42: ...l switch C3161 Measure the resistance between RRCM C3160a 4 pin 4 circuit 1349 PK LG and the rear climate control switch C3161 2 circuit 1349 PK LG Is the resistance less than 5 ohms Yes GO to P2 No REPAIR circuit 1349 PK LG for an open CLEAR the DTCs REPEAT the self test TEST the system for normal operation P2 CHECK CIRCUIT 1349 PK LG FOR A SHORT TO VOLTAGE Measure the voltage between rear climat...

Страница 43: ...stallation and overtightening of non specification clamps can cause leakage at the heater water hose connection and damage the heater core Check the integrity of the heater water hose clamps Heater Core Plugged WARNING The heater core inlet hose will become too hot to handle if the system is working correctly 1 Check to see that the engine coolant is at the correct level 2 Start the engine and tur...

Страница 44: ...core or A C condenser core from the A C system For additional information refer to Section 412 01 3 Connect the appropriate test fittings from the R12 R134a Air Conditioning Test Fitting Set to the evaporator or condenser tube connections 4 NOTE The automatic shut off valves on some gauge set hoses do not open when connected to the test fittings If available use hoses without shut off valves If ho...

Страница 45: ...the high and low pressure lines of a manifold gauge set or a refrigerant recovery recycling station such as the R 134a A C Service Center to the corresponding fittings on the A C pressure test adapter 3 Attach the center hose of the manifold gauge set to a refrigerant container standing in an upright position 4 Hand rotate the compressor shaft 10 complete revolutions to distribute the oil inside t...

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