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Test A: No Communication With EATC Module

  1. Disconnect EATC module 13-pin harness connector C227. Measure resistance between ground and EATC module harness connector terminal No. 3 (Black wire). See Fig 1. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open or high resistance in Black wire. See WIRING DIAGRAMS . Recheck system operation.
    Fig 1: Identifying EATC Module Harness Connectors C227 & C228 Terminals
    G00026508Courtesy of FORD MOTOR CO.
  2. Measure voltage between ground and EATC module harness connector C227 terminal No. 2 (Light Green/Yellow wire). If battery voltage exists, go to next step. If battery voltage does exist, repair open in Light Green/Yellow wire. See WIRING DIAGRAMS . Recheck system operation.
  3. Measure voltage between ground and EATC module harness connector C227 terminal No 16 (Violet/Orange wire). If battery voltage exists, fault is in module communications network. See MODULE COMMUNICATIONS NETWORK - CROWN VICTORIA & GRAND MARQUIS article in ACCESSORIES & EQUIPMENT. If battery voltage does not exist, repair open in Violet/Orange wire. See WIRING DIAGRAMS . Recheck system operation.
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