Test A: 4-Wheel Anti-Lock Brake System 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. Disconnect 4-Wheel Anti-Lock Brake System (4WABS) control module 25-pin harness connector C146. 4WABS control module is located in left front of engine compartment. Inspect 4WABS control module harness connector 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 of Light Blue/White wire between 4WABS control module harness connector C146 terminal No. 1 and Data Link Connector (DLC) terminal No. 7. See Figure and Fig 1 . If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, go to step 4.
- Connect 4WABS control module harness connector. Perform data link diagnostic test. See DATA LINK DIAGNOSTIC TEST under SELF-DIAGNOSTIC SYSTEM. If 4WABS control module responds to NGS tester, system is functioning properly. If 4WABS control module does not respond to NGS tester, replace 4WABS control module. See 4-WHEEL ANTI-LOCK BRAKE SYSTEM CONTROL MODULE under REMOVAL & INSTALLATION.
- Disconnect and inspect both halves of 40-pin harness connector C160. See Fig 2. Inspect harness connector 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 of Light Blue/White wire between DLC terminal No. 7 and in-line Gray harness connector C160 (female half) terminal No. 29. See Figure and Fig 3 . If resistance is 5 ohms or less, repair open in Light Blue/White wire between male half of in-line Gray harness connector C160 and 4WABS control module. If resistance is more than 5 ohms, repair open in Light Blue/White wire between DLC and female half of in-line Gray harness connector C160.