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Fuel Gauge: RX7

  1. Ensure fuse and wiring are okay. To test fuel gauge, disconnect fuel gauge sending unit connector at fuel tank.
  2. Connect Red wire lead of Checker (49-0839-285) to White/Green wire terminal (harness side) of sending unit connector. See Fig 1 . Connect checker Black wire lead to body ground.
  3. Set checker to resistance values shown in FUEL GAUGE RESISTANCE  . Turn ignition switch to ON position and ensure needle position corresponds to resistance measurement. See Figure .
  4. Allow 2 minutes for needle to stabilize. Allowable limit of needle deflection is twice width of needle.
  5. If gauge needle readings are as specified in FUEL GAUGE RESISTANCE  , replace sending unit. If gauge readings are not as specified, check wiring. If wiring is okay, replace gauge.
Fig 1: Testing Fuel Gauge Resistance (RX7)
G90H01277Courtesy of MAZDA MOTORS CORP.
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