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Oil Pressure Reads Inaccurately

  1. Turn ignition on. Measure voltage between ground and load side of fuse No. 18 (Aerostar) or fuse No. 11 (Ranger) located in instrument panel fuse panel. If voltage is more than 10 volts, go to step 3). If voltage is less than 10 volts, go to next step.
  2. Measure voltage between ground and feed side of fuse No. 18 (Aerostar) or fuse No. 11 (Ranger) located in instrument panel fuse panel. If voltage is more than 10 volts, replace fuse and retest system. If voltage is less than 10 volts, repair wiring to fuse. See WIRING DIAGRAMS  .
  3. Partially remove instrument cluster leaving connectors connected. See appropriate INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Turn ignition on. On Aerostar, measure voltage between ground and instrument cluster connectors C250, terminal No. 12 and C251, terminal No. 13 (all Red/Yellow wires). See Figure . On Ranger, measure voltage between ground and instrument cluster connectors C214, terminal No. 13, C215, terminal No. 8 and C216, terminal No. 1 (all Red/Yellow wires). See Figure , Figure and Figure . If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, repair open in appropriate Red/Yellow wire. See WIRING DIAGRAMS  .
  4. Turn ignition off. On Aerostar, measure resistance between ground and instrument cluster connectors C250, terminal No. 13 and C251, terminal No. 9 (all Black/White wires). See Figure . On Ranger, measure resistance between ground and instrument cluster connector C215, terminal No. 2 (Black/White wire). See Figure . If resistance is less than one ohm, go to next step. If resistance is more than one ohm, repair open in appropriate Black/White wire. See WIRING DIAGRAMS  .
  5. Turn ignition on and observe oil pressure gauge. If oil pressure gauge reads "L" (low) or below, leave ignition on and go to next step. If oil pressure gauge does not read "L" (low) or below, go to step 7).
  6. Disconnect oil pressure switch connector and short connector directly to ground. If oil pressure gauge reads about mid-scale or slightly above, replace oil pressure switch and retest system. If oil pressure gauge does not read about mid-scale or slightly above, go to next step.
  7. Turn ignition off. Using ohmmeter, check sending unit/switch wiring and instrument cluster printed circuit for shorts or opens by physically flexing wiring and observing continuity. Continuity reading should not fluctuate. If wiring and printed circuit test okay, replace oil pressure gauge. See GAUGES  under REMOVAL & INSTALLATION. On Aerostar, if wiring or printed circuit do not test okay, repair wiring or replace instrument cluster. See appropriate INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. On Ranger, if wiring or printed circuit do not test okay, repair wiring or replace instrument cluster printed circuit. See PRINTED CIRCUIT (RANGER)  under REMOVAL & INSTALLATION.
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