Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD1999WINDSTAR BASE, VAN CARGO, 3.8 4REPAIR AND DIAGNOSIS (SINGLE PAGE)EXTERNAL PAGESDIFFERENT CARSECTION 36 (MODULE COMMUNICATIONS NETWORK)SYSTEM TESTSTEST J: ELECTRONIC AUTOMATIC TEMPERATURE CONTROL MODULE DOES NOT RESPOND TO NGS TESTER
1999 Ford Windstar Base, Van Cargo, 3.8 4
Test J: Electronic Automatic Temperature Control Module Does Not Respond To NGS Tester
1999 Ford Windstar Base, Van Cargo, 3.8 4SECTION Test J: Electronic Automatic Temperature Control Module Does Not Respond To NGS Tester
WARNING: This page is about a different car, the 2002 Lincoln Navigator, 2002 Ford Expedition, 2001 Lincoln Navigator, and 2001 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
After making any repair, perform data link diagnostic test. See DATA LINK DIAGNOSTIC TEST under SELF-DIAGNOSTIC SYSTEM.
- Turn ignition switch to LOCK position. Electronic Automatic Temperature Control (EATC) module has two 13-pin connectors. Disconnect EATC module 13-pin harness connector C280. EATC is located behind center of instrument panel. Harness connector C280 only has one blank terminal. Inspect EATC module harness connector C280 for loose, damaged or corroded terminals. If problem does not exist with harness connector, go to next step. If problem exists with harness connector, repair as necessary.
- Measure resistance in Tan/Orange wire between EATC module harness connector C280 terminal No. 15 and Data Link Connector (DLC) terminal No. 2. See Figure and Fig 1 . If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open in Tan/Orange wire between EATC module harness connector and DLC.
- Measure resistance in Pink/Light Blue wire between EATC module harness connector C280 terminal No. 1 and DLC terminal No. 10. If resistance is 5 ohms or less, replace EATC module. See ELECTRONIC AUTOMATIC TEMPERATURE CONTROL MODULE under REMOVAL & INSTALLATION. If resistance is more than 5 ohms, repair open in Pink/Light Blue wire between EATC module harness connector and DLC.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.