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Home >> Mazda >> 1990 >> RX-7 Base, Automatic >> Repair and Diagnosis (Single Page) >> Electrical >> Gauges >> Instrument Panel - Standard >> Component Testing >> Oil Pressure Gauge >> Resistance Test (Navajo)

Resistance Test (Navajo)

  1. Disconnect oil pressure sending unit. Connect Red lead of Checker (49-0839-285) to wire and Black wire to chassis ground.
  2. Move checker switch to 73-ohm position. If gauge does not move, go to next step. If gauge reads "L", set checker to 9.7-ohm position. If gauge reads about midrange on scale, replace sender. If gauge does not read about midrange on scale, go to next step.
  3. Check sender circuit wiring for shorts and opens using ohmmeter. If wiring is okay, replace gauge. If wiring is shorted or open, repair wiring as necessary. See appropriate chassis wiring diagram in WIRING DIAGRAMS article.
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