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Home >> Mercury Truck >> 2002 >> Mountaineer 2WD V6-4.0L VIN E >> Repair and Diagnosis >> Heating and Air Conditioning >> Testing and Inspection >> Initial Inspection and Diagnostic Overview

Initial Inspection and Diagnostic Overview

1. Verify the customer concern by operating the climate control system to duplicate the condition.


Visual Inspection Chart:






2. Visually inspect for obvious signs of mechanical or electrical damage.
3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
4. If the cause is not visually evident, connect a scan tool to the data link connector and select the vehicle to be tested from the scan tool menu. If the scan tool does not communicate with the vehicle:
- check that the program card is correctly installed.
- check the connections to the vehicle.
- check the ignition switch position.
5. If the scan tool still does not communicate with the vehicle, refer to the scan tool operating manual.
6. Carry out the DATA LINK DIAGNOSTICS test. If the scan tool responds with:
- CKT 914, CKT 915, or CKT 70 ALL ECUS NO RESP/NOT EQUIP, refer to Module Communications Network (Information Bus) to diagnose the network concern.
- If the Powertrain Control Module (PCM) is not listed for a communication concern, turn the A/C controls to OFF and execute self-test diagnostics for the PCM.
- If equipped with DATC and the DATC module is not listed for a communication concern, execute self-test diagnostics for the DATC module. Dual Automatic Temperature Control Module Self-Test

7. If any PCM or DATC DTCs are retrieved, and are related to the concern, go to the Powertrain Control Module Diagnostic Trouble Code Index or the Dual Automatic Temperature Control Module Diagnostic Trouble Code Index to continue diagnostics. Powertrain Control Module Diagnostic Trouble Code (DTC) Index Dual Electronic Auto Temp Control (DEATC) Module Diagnostic Trouble Codes
8. If no DTCs related to the concern are retrieved, go to the Symptom Chart to continue diagnostics. Symptom Related Diagnostic Procedures
9. If the dual automatic temperature control module cannot be accessed by the scan tool, GO to Pinpoint Test L. Test L: No Communication With The DATC Module
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