Test A - Integrated Circuit Display(S) Inoperative Or Erratic
- Check METER fuse. See Figure . If fuse is okay, go to step 4). If fuse is blown, go to next step.
- Turn ignition switch to OFF Position. Replace 15A METER fuse. Turn ignition switch to ON position and inspect fuse. If fuse fails again, go to next step. If fuse does not fail, go to step 4).
- Turn ignition switch to OFF position. Remove instrument cluster. See INSTRUMENT CLUSTER under REMOVAL & INSTALLATION. Disconnect all (3) instrument cluster connectors. See Fig 1 -8. Remove METER fuse. Measure resistance of each Black/Yellow wire (circuit No. 160) between each instrument cluster connector and ground. If resistances are more than 10 k/ohms, replace METER fuse and go to next step. If resistance is less than 10 k/ohms, repair Black/Yellow wire(s) for short to ground and retest system.
- Turn ignition switch to OFF position. Disconnect all (3) cluster connectors. Turn ignition switch to ON position. Measure voltage on Black/Yellow wire (circuit No. 160) of each instrument cluster connector. If voltages are more than 10 volts, go to next step. If voltages are less than 10 volts, repair Black/Yellow wire(s) for open and retest system.
- Turn ignition switch to OFF position. Measure resistance of Black wires between all instrument cluster connectors and ground. If resistances are less than 5 ohms, replace instrument cluster printed circuit and retest system. See PRINTED CIRCUIT under REMOVAL & INSTALLATION. If resistances are more than 5 ohms, repair Black wire(s) for open and retest system
Fig 1: Instrument Cluster & Wire Colors Cluster Connector Placement ID (W/ Tachometer Shown; W/O Tachometer Similar - Escort & Tracer)