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Test A: 4-Wheel Anti-Lock Brake System (4WABS) Module Does Not Respond To NGS Tester

  1. Turn ignition off. Disconnect 4WABS module connector located at left front of engine compartment. Inspect connector for physical damage, bent terminals or corrosion. Repair connector as necessary and retest system for normal operation. If connector is okay, go to next step.
  2. Measure resistance of Light Blue/White wire between terminal No. 20 at 4WABS module connector and terminal No. 7 at Data Link Connector (DLC). See Figure and Fig 1. If resistance is less than 5 ohms, replace 4WABS module and retest system for normal operation. If resistance is 5 ohms or more, go to next step.
  3. Disconnect and inspect both halves of 40-pin bulkhead connector C148 located at left rear of engine compartment, near brake master cylinder. See Fig 2. Inspect connector for physical damage, bent terminals or corrosion. Repair connector as necessary and retest system for normal operation. If connector is okay, go to next step.
  4. Measure resistance of Light Blue/White wire between terminal No. 16 at female half of connector C148 and terminal No. 7 at DLC. See Figure and Fig 3. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Light Blue/White wire between DLC and bulkhead connector. Retest system for normal operation.
  5. Disconnect and inspect both halves in-line connector C140 located at left front of engine compartment, near 4WABS module connector. Inspect connector for physical damage, bent terminals or corrosion. Repair connector as necessary and retest system for normal operation. If connector is okay, go to next step.
  6. Measure resistance of Light Blue/White wire between terminal No. 16 at male half of bulkhead connector C148 and terminal No. 7 at female half of in-line connector C140. See Fig 3 and Fig 4.. If resistance is less than 5 ohms, repair open in Light Blue/White wire between in-line connector C140 and 4WABS connector. Retest system for normal operation. If resistance is 5 ohms or more, repair open in Light Blue/White wire between connector C148 and in-line connector C140. Retest system for normal operation.
Fig 1: Identifying 4WABS Module Connector Terminals
G98H01687Courtesy of FORD MOTOR CO.
Fig 2: Locating Connectors
G98B01694Courtesy of FORD MOTOR CO.
Fig 3: Identifying 40-Pin Bulkhead Connectors C147 & C148
G97G28809Courtesy of FORD MOTOR CO.
Fig 4: Identifying In-Line Connector C140 Terminals
G98B01689Courtesy of FORD MOTOR CO.
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