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Test T: 4X4/4X4 Low Range Indicator Inoperative/Always On (Electronic Shift)

  1. Turn ignition switch to LOCK position. Connect New Generation Star (NGS) tester to Data Link Connector (DLC). DLC is located below center of instrument panel, right of steering column. Turn ignition switch to RUN position. Select instrument cluster WARNING LAMPS AND CHIME active command. Trigger active command ALL LAMPS on and off. Observe the 4X4 and 4X4 LOW indicators. If 4X4 and 4X4 LOW indicators do not illuminate and turn off as commanded, go to step  9. If indicators do illuminate and turn off as commanded but 4X4 indicator is inoperative, go to next step. If indicators do illuminate and turn off as commanded but 4X4 LOW indicator is inoperative, go to step  4. If indicators do illuminate and turn off as commanded but 4X4 indicator is always on, go to step  6. If indicators do illuminate and turn off as commanded but 4X4 LOW indicator is always on, go to step  7.
  2. Turn ignition switch to LOCK position. Disconnect 4X4 control module harness connector C281b. Remove instrument cluster to gain access to instrument cluster harness connectors. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Disconnect instrument cluster harness connector C220b. Measure resistance in Light Blue wire between the instrument harness connector C220b terminal No. 5 and 4X4 control module harness connector C281b terminal No. 9. See Figure and Fig 1 . If resistance is less than 5 ohms, go to next step. If resistance is greater than 5 ohms, repair open circuit in Light Blue wire and test system operation. See WIRING DIAGRAMS .
    Fig 1: Identifying 4X4 Control Module Harness Connectors C281b Terminals
    G98F01672Courtesy of FORD MOTOR CO.
  3. Ensure ignition switch is in LOCK position. Measure voltage between ground and instrument cluster harness connector C220b terminal No. 5 (Light Blue wire). See Figure. If any voltage is present, repair short to voltage in Light Blue wire and test system operation. If no voltage is present, go to step  8.
  4. Turn ignition switch to LOCK position. Disconnect 4WD Control Module harness connector C281b. Remove instrument cluster to gain access to instrument cluster harness connectors. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Disconnect instrument cluster harness connector C220b. Measure resistance between instrument cluster harness connector C220b terminal No. 4 (Brown/Yellow wire) and 4WD control module harness connector C281b terminal No. 8 (Brown/Yellow wire). If resistance is greater than 5 ohms, repair open in Brown/Yellow wire and test system operation. See WIRING DIAGRAMS . If resistance is less than 5 ohms, go to next step.
  5. Ensure ignition switch is in the LOCK position. Measure voltage between ground and instrument cluster harness connector C220b terminal No. 4 (Brown/Yellow wire). If no voltage is present, go to step  8. If any voltage is present, repair short to voltage in Brown/Yellow wire and test system operation. See WIRING DIAGRAMS .
  6. Turn ignition switch to LOCK position. Remove instrument cluster to gain access to instrument cluster harness connectors. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Disconnect instrument cluster harness connector C220b. Measure resistance between ground and instrument cluster harness connector C220b terminal No. 5 (Light Blue wire). If resistance is greater than 10 k/ohms, go to step  8. If resistance is less than 10 k/ohms, repair short to ground in Light Blue wire and test system operation. See WIRING DIAGRAMS .
  7. Turn ignition switch to LOCK position. Remove instrument cluster to gain access to instrument cluster harness connectors. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Disconnect instrument cluster harness connector C220b. Measure resistance between ground and instrument cluster harness connector C220b terminal No. 4 (Brown/Yellow wire). If resistance is greater than 10 k/ohms, go to next step. If resistance is less than 10 k/ohms, repair short to ground in Brown/Yellow wire and test system operation. See WIRING DIAGRAMS .
  8. Turn ignition switch to LOCK position. Check 4X4 module for corrosion, pushed out pins and harness connectors that are not connected correctly. Repair any damage found and reconnect any loose harness connectors. Retest system operation. If problem does not exist, system is operating correctly at this time. Clear any DTCs. If problem exists, replace 4X4 module. See 4X4 CONTROL MODULE  under REMOVAL & INSTALLATION. Retest system operation.
  9. Turn ignition switch to LOCK position. Check instrument cluster for corrosion, pushed out pins and harness connectors that are not connected correctly. Repair any damage found and reconnect any loose harness connectors. Retest system operation. If problem does not exist, system is operating correctly at this time. Clear any DTCs. If problem exists, replace instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Retest system operation.
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