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Home >> Ford >> 2000 >> Excursion 7.3 F, 4WD >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Supplemental Inflatable Restraint System - Excursion & Super Duty >> Diagnostic Tests >> Test X: No Communication With ECS Module

Test X: No Communication With ECS Module

  1. Check connections for damage

    Turn ignition off. Disable air bag system. See DISABLING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. Access ECS module and disconnect harness connector. See ELECTRONIC CRASH SENSOR  under REMOVAL & INSTALLATION. Inspect ECS module terminals and module harness connector terminal No. 19 for damage. See Figure. If module terminals and module harness connector terminal No. 19 are okay, go to next step. If module terminals and module harness connector terminal No. 19 are damaged, repair/replace as necessary. Activate air bag system. See ACTIVATING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM.

  2. Check DLC for damage

    Inspect Data Link Connector (DLC) and DLC connector terminal No. 7 (Light Blue/White wire) for damage. See Fig 1. DLC is located under left side of instrument panel. If DLC connector and DLC connector terminal No. 7 (Light Blue/White wire) is okay, go to next step. If DLC connector and DLC connector terminal No. 7 (Light Blue/White wire) is damaged, repair/replace as necessary. Activate air bag system. See ACTIVATING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM.

  3. Check circuit 70 for open

    Measure resistance of Light Blue/White wire between DLC connector terminal No. 7 and ECS module harness connector terminal No. 19. If resistance is less than 5 ohms, replace ECS module. Activate air bag system. See ACTIVATING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM. If resistance is more than 5 ohms, repair open in Orange/Light Gray/White wire. Activate air bag system. See ACTIVATING SYSTEM  under DISABLING & ACTIVATING AIR BAG SYSTEM.
    Fig 1: Identifying Data Link Connector (DLC) Terminals
    G98H08170Courtesy of FORD MOTOR CO.
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