Test E: Automatic Temperature Control (EATC) Module Does Not Respond To NGS Tester
- Turn ignition switch to LOCK position. Disconnect EATC module White 13-pin harness connector C274 located in behind center of instrument panel. Inspect harness connector for loose, damaged or corroded terminals. Repair as necessary and retest system for normal operation. If harness connector is okay, reconnect harness connector. Turn ignition switch to RUN position. Perform data link diagnostic procedure. See DATA LINK DIAGNOSTIC TEST
under SELF-DIAGNOSTIC SYSTEM. If NGS tester indicates EATC: NO RESPONSE ON CKT 914 (BUS +), go to next step. If NGS tester indicates EATC: NO RESPONSE ON CKT 914 (BUS -), go to step 3
.
- Turn ignition switch to LOCK position. Disconnect New Generation Star (NGS) tester. Disconnect EATC module harness connector C274. Measure resistance in Tan/Orange wire between terminal No. 15 at EATC module harness connector C274 and terminal No. 2 at Data Link Connector (DLC). See Figure
and Fig 1
. If resistance is 5 ohms or less, replace EATC module. If resistance is greater than 5 ohms, repair open in Tan/Orange wire between EATC module and DLC.
- Turn ignition switch to LOCK position. Disconnect New Generation Star (NGS) tester. Disconnect EATC module harness connector C274. Measure resistance in Pink/Light Blue wire between terminal No. 1 at EATC module harness connector C274 and terminal No. 10 at Data Link Connector (DLC). See Figure
and Fig 1
. If resistance is 5 ohms or less, replace EATC module. If resistance is greater than 5 ohms, repair open in Pink/Light Blue wire between EATC module and DLC.
Courtesy of FORD MOTOR CO.