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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 (AEROSTAR, Bronco II & Ranger)

Calibration Test (AEROSTAR, Bronco II & Ranger)

  1. Use Rotunda Gauge Tester No. 021-00055 to check fuel gauge. Place ignition switch in OFF position. Install Rotunda Gauge Tester in circuit. Set tester to 22-ohm position. Turn ignition on. Wait 60 seconds then read fuel gauge.
  2. If gauge reads "E", go to step 5). If gauge does not read "E", turn ignition switch off then back on. Tap on instrument panel and wait for one minute. If gauge goes to "E", check for intermittent B+ connection at cluster connector or printed circuit damage.
  3. Repair as necessary and repeat test. If after repeating test, gauge does not read "E", turn ignition off. Remove instrument cluster and inspect printed circuit for damage. Remove slosh module, located on back of cluster and connect jumper wire from gauge tester to fuel gauge terminal "S".
  4. Turn ignition on and observe gauge. If gauge does not read "E", replace gauge. If gauge reads "E", replace slosh module.
  5. Turn ignition off. Set Rotunda Gauge Tester to 145-ohm setting. Turn ignition on, wait 60 seconds and read fuel gauge. If gauge reads "F", check sender circuit wiring for shorts or opens with ohmmeter. If gauge does not read "F", turn ignition off and remove instrument cluster.
  6. Inspect printed circuit to ensure loop connecting fuel sender input to fuel gauge is cut. If loop is not cut, correctly cut printed circuit at loop. Remove slosh module from rear of cluster and connect jumper wire from gauge tester to fuel gauge "S" terminal. Reconnect cluster connector and recheck gauge.
  7. If fuel gauge reads "F", replace slosh module. If gauge does not read "F", replace gauge. To check fuel gauge resistance use ohmmeter. Gauge should read EMPTY at 22.5 ohms and FULL at 145 ohms. See appropriate chassis wiring diagram in the WIRING DIAGRAMS section.
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