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Home >> Ford >> 1990 >> Bronco II 4WD, Standard, M5OD-R1 >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel - Standard >> Fuel Level Gauge Testing >> Calibration Test ("E" Series)

Calibration Test ("E" Series)

  1. The required test equipment is a 10-ohm resistor and a 73-ohm resistor. Disconnect wiring connector at sending unit. Connect one of the resistors between lead wire terminal and ground. Turn ignition switch to RUN or ACC position.
  2. With 10-ohm resistor installed, gauge should read 2 pointer widths above "F" mark. With 73-ohm resistor installed, gauge should read 2 pointer widths below "E" mark.
  3. With no resistor (open circuit), gauge reading should be the same as with ignition switch in OFF position. If reading is okay, replace wire connection to sender.
  4. If gauge pointer does not move and stays below "E" mark, check for an open circuit in wiring assembly, gauge windings, or instrument cluster printed circuit. If gauge pointer moves with no resistor connected, check for a short circuit in sender unit lead. If gauge reads out of calibration, replace IVR (if equipped) and retest. If calibration is still incorrect, replace gauge. See appropriate chassis wiring diagram in the WIRING DIAGRAMS section.
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