town car automatic temperature control diagnostics
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Filed Under (Ford) by admin on 28-03-2011
Inspection and Verification 1. Verify the customer’s concern by operating the climate control system to duplicate the condition. 2. Inspect to determine if one of the following mechanical or electrical concerns apply: Visual Inspection Chart Loose, missing or damaged A/C compressor drive belt. Loose or disconnected A/C clutch. Loose, misrouted or damaged vacuum lines. Broken or leaking vacuum control motora Discharged A/C system. Broken or leaking refrigerant lines. a a A leak in the vacuum control circuit may occur during acceleration (slow leak), may exist at all times (large leak), and may exist only when specific functions are selected (indicating a leak in that portion of the circuit). The vacuum hoses used in the passenger compartment control circuit are constructed from PVC plastic material. The vacuum hoses used in the engine compartment are constructed of Hytrel®. Because of the materials used, never pinch the vacuum hoses off during diagnosis to locate a leak. A wood golf tee can be used as a plug when it is necessary to plug one end of the vacuum hose for leak test purposes. 3. If the inspection reveals obvious concern(s) that can be readily identified, service as required. 4. If equipped with the electronic automatic temperature control system, go to Step 6. 5. If equipped with a manual A/C system, determine the symptom and go to the Symptom Chart. 6. If the concern remains after the inspection, connect the Rotunda New Generation Star (NGS) Tester to the data link connector (DLC) located beneath the instrument panel to carry out the DATA LINK DIAGNOSTICS test. If the NGS responds with NO RESPONSE/NOT EQUIPPED for the electronic automatic temperature control module, GO to Pinpoint Test A. If the DATA LINK DIAGNOSTICS test is passed for the electronic automatic temperature control module, retrieve the continuous DTCs and execute the Self-Test Diagnostics for the electronic automatic temperature control module to retrieve the current DTCs. Mechanical Electrical Open fuses. Blower motor inoperative. A/C compressor inoperative. Circuitry open/shorted. Disconnected electrical connectors. 7. If the self-test is passed and no DTCs are retrieved, go to the Symptom Chart to continue diagnostics. 8. If DTCs are retrieved, go to the Electronic Automatic Temperature Control (EATC) Module Diagnostic Trouble Code (DTC) Index to continue diagnostics. 9. If the electronic automatic temperature control module cannot be accessed by the NGS, GO to Pinpoint Test A. Electronic Automatic Temperature Control Module Self-Test 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) in addition to intermittent diagnostic trouble codes for concerns that occur during system operation. The vehicle interior temperature should be between 4-32° (40-90°F) when performing the self-test. If the temperatures are C 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 self-test 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 self-test and retain all intermittent DTCs, push the blue (cooler temperature) button. The control will exit self-test, retain all intermittent DTCs and then turn OFF (display blank). To exit 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). Intermittent DTCs will be deleted after 80 ignition switch ON cycles after the intermittent condition occurs.
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Filed Under (Chevrolet) by admin on 10-09-2010
On customer comments of low heater output on 1989-91 J cars, before replacing a suspected defective engine cooling thermostat, proper diagnosis of the condition must be performed to avoid the possibility of a repeat repair. Follow “Diagnosis” as shown in Section 1A/1B of the appropriate Service Manual. After completing the diagnosis, use the following as a guide to the next corrective step: ^ If the diagnosis indicates a defective thermostat, refer to Section 6C for replacement. ^ If the diagnosis indicates a defective temperature control cable, refer to Section 1A/1B for replacement. ^ If the diagnosis indicates the temperature control cable is no longer “snapped” into its retainer, refer to “Temperature Control Cable Repair” in the 1991 Service Manual, Sections 1A/1B. ^ If the diagnosis indicates that the temperature control cable is out of adjustment, refer to the following procedure to repair. TEMPERATURE CONTROL CABLE ADJUSTMENT PROCEDURE Condition: Condition: Cause: Correction For Number: 1. “Spring back” off full “hot” temperature control position (or not attaining full “cold” temperature door position). 2. “Spring back” off full “cold” temperature control position (or not attaining full “hot” temperature door position). The temperature control cable “clip” needs adjustment. Refer to the illustration for correct gripping of the “clip” during adjustment. 1. Grip “clip” at module end of cable while pulling temperature control lever to “hot” position.
Filed Under (Lincoln) by admin on 09-03-2011
Front Town Car The following procedure must be used during removal and installation of the door armrest and trim panel. Refer to the appropriate illustrations for component and vehicle model identification. Removal CAUTION: To avoid breakage of door pull cover(s), insert a screwdriver diagonally between pull strap and chrome bracket. Snap out both sides then remove. 1. Snap out two door pull strap retaining screw covers. Remove screws. 2. Remove two screws on front and rear side of front door trim panel. 3. Using the Trim Pad Removing Tool from Rotunda Moulding/Trim Kit 107-00401 or equivalent, pry the trim panel retaining clips from the door inner panel. NOTE: Do not use front door trim panel (23942) to remove trim clips from door inner panel. Replace any bent, damaged or missing push pins. 4. Remove window regulator control switch housing from back of front door trim panel . Lift up housing, remove retaining screws and disconnect all connectors. 5. Disconnect driver seat regulator control processor switch (driver door only) if equipped. 6. Twist out interior lamp wire assembly and remove the front door trim panel. Installation 1. Ensure plastic watershield is secured to door panel. 2. Position front door trim panel to door. Connect interior lamp wiring. 3. Position the window regulator control switch housing and connect switch connectors. 4. Connect driver seat regulator control processor (14C708) (driver door only) if equipped. 5. Align door lock side to its mating slide on the sheet metal (front doors only) 6. Snap in front door trim panel . Ensure all retainers fit properly. 7. Install two retaining screws on front and rear side of front door trim panel . 8. Install two retaining screws and pull strap covers.
Filed Under (Jaguar) by admin on 25-10-2010
The outlet temperature of the climate control system may not be able to be lowered from either the driver or passenger face and side vents; there may also be an extreme difference between the driver and passenger sides. This issue may be caused by a fault within the Dual Coolant Control Valve (DCCV) or the Dual Automatic Temperature Control (DATC) or an electrical circuit fault. Action: In the event of a customer concern of the above, refer to the Diagnostic Procedure outlined below to assist in determining if the fault is electrical or mechanical. 1. Verify A/C compressor operation, refrigerant charge level, and system powers and grounds. 2. Start engine. 3. Using the Dual Automatic Temperature Control (DATC), select: ^ ‘HIGH’ temperature ^ ‘HIGH’ fan speed ^ ‘RECIRC’ and ‘PANEL’ modes 4. Allow vehicle to sit for five minutes. 5. Using the DATC, select: ^ ‘LOW’ temperature 6. Allow vehicle to sit for five minutes 7. Using a suitable temperature gauge, record the outlet temperature from both the driver and passenger air distribution vents. Recorded temperatures should be 7°C (45°F). 8. If the recorded temperatures are within 6°C (10°F) of each other, the climate control system is operating normally and no additional diagnosis is necessary. 9. If either of the recorded temperatures are greater than 45°F or the difference between the recorded temperatures is greater than 6°C (10°F), continue the Diagnostic Procedure. 10. Shut engine off. ELECTRICAL TEST
Filed Under (Ford) by admin on 15-08-2010
Air suspension switch in trunk area must be turned o . On 1991-94 vehicles, locate the control module for the air suspension in the trunk area on either the back of rear seat or behind the trim panel on the right rear side of the trunk. On 1995-97 vehicles the control module is located under the right side of dash panel. There are 2 connectors for all model years, 1 black and 1 gray. On the 98-06 leave the solenoid connected. Disconnect the black connector and remove or cut the wire to pin #11 as shown. This will turn o the “AIR SUSP” message on the dashboard. The color code for this wire should be as follows: LINCOLN TOWN CAR: dark green/light green CROWN VICTORIA: green MERCURY GRAND MARQUIS: green Reconnect the black connector to the control module. This connector must be reconnected as the control module also controls functions of the “EVO” steering system. Turn Suspension Switch ON. NOTE: The parts in this kit are designed to replace the worn or nonfunctioning original equipment parts in the vehicle as produced by the car factory. These parts are not designed for installation on vehicles where the suspension aand/or steering systems have been modified for racing, competition, or any other reason than originally designed by manufacturer.