LEMON Manuals: Even more car manuals for everyone
Home >> Ford >> 2002 >> Taurus LX, 3.0 S >> Repair and Diagnosis >> Electrical >> Gauges >> Instrument Panel - Analog >> System Tests >> Test G: Tachometer Is Inoperative

Test G: Tachometer Is Inoperative

CAUTION: Use correct test probe adapters when making measurements. Failure to use correct probe adapter may cause damage to connector.
NOTE: Perform all voltage and resistance tests using an Digital Volt-Ohm Meter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use ohmmeter to isolate wiring harness shorts or opens.
  1. Turn ignition switch to LOCK position. Disconnect Powertrain Control Module (PCM) 104-pin harness connector C175, located at right rear of engine compartment. See Figure. Disconnect instrument cluster harness connector C220b, located behind instrument cluster. SeeFigure. It may be necessary to remove instrument cluster to access connectors. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Measure resistance between PCM harness connector C175 terminal No. 48 and instrument cluster harness connector C220b terminal No. 8 (Tan/Yellow wire). See Figure and Figure . See WIRING DIAGRAMS . If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair open circuit in Tan/Yellow wire between PCM and instrument cluster. After repair, test system for normal operation.
  2. Measure resistance between ground and instrument cluster harness connector C220b terminal No. 13 (Black/Yellow wire). See Figure. See WIRING DIAGRAMS . If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair open circuit in Black/Yellow wire between instrument cluster and ground point located behind center of instrument cluster. SeeFigure. After repair, test system for normal operation.
  3. Remove instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Inspect instrument cluster printed circuit for contamination or damage. If instrument cluster printed circuit is faulty, replace instrument cluster printed circuit. See PRINTED CIRCUIT  under REMOVAL & INSTALLATION. If printed circuit is okay, replace tachometer. See TACHOMETER  under REMOVAL & INSTALLATION. After repair, test system for normal operation.
scientia non olet · About LEMON Manuals