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Test E: Electronic Automatic Temperature Control (EATC) Module Does Not Respond To NGS Tester

WARNING: This page is about a different car, the 1998 Lincoln Mark VIII. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition off. Disconnect EATC Gray 13-pin connector C273, located behind center of instrument panel, below radio. Inspect EATC connector for loose, damaged or corroded terminals. Repair connector as necessary and retest system for normal operation. If connector is okay, reconnect EATC connector. Turn ignition on. Perform data link diagnostic procedure. See DATA LINK DIAGNOSTIC TEST under COMMUNICATION NETWORK DIAGNOSTICS. If NGS tester indicates EATC: NO RESPONSE ON CKT 914 (BUS +) or EATC: NO RESPONSE ON CKT 915 (BUS -), go to next step. If NGS tester does not indicate EATC: NO RESPONSE ON CKT 914 (BUS +) or EATC: NO RESPONSE ON CKT 915 (BUS -), no problem is indicated at this time. Return to article that directed you here and continue diagnosis.
  2. If NGS tester indicated EATC: NO RESPONSE ON CKT 914 (BUS +) in step 1), go to next step. If NGS tester indicated EATC: NO RESPONSE ON CKT 915 (BUS -) in step 1), go to step 4).
  3. Turn ignition off. Disconnect EATC Gray 13-pin connector C273. Disconnect NGS tester. Using an ohmmeter, measure resistance of Tan/Orange wire between terminal No. 15 at EATC module connector C273 and terminal No. 2 at Data Link Connector (DLC). See Figure and Fig 1. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair Tan/Orange wire between EATC module connector C273 and DLC. Retest system for normal operation.
  4. Turn ignition off. Disconnect EATC Gray 13-pin connector C273. Disconnect NGS tester. Using an ohmmeter, measure resistance of Pink/Light Blue wire between terminal No. 1 at EATC module connector C273 and terminal No. 10 at Data Link Connector (DLC). See Figure and Fig 1. If resistance is less than 5 ohms, replace EATC module and retest system for normal operation. If resistance is 5 ohms or more, repair Pink/Light Blue wire between EATC module connector C273 and DLC. Retest system for normal operation.
Fig 1: Identifying EATC Module Connector C273 Terminals
G98B01439Courtesy of FORD MOTOR CO.
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