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Home >> Chevrolet >> 1995 >> Corvette Base, 2D Convertible, Automatic >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel - Electronic >> Testing >> Instrument Cluster & Panel Displays >> Fuel Gauge Appears Inaccurate Or Inoperative

Fuel Gauge Appears Inaccurate Or Inoperative

  1. Disconnect Black, 4-pin fuel tank sending unit connector located at rear of vehicle, on top of fuel tank. Turn ignition on, with engine off. Using Signal Generator/Instrument Panel (IP) Tester (J-33431-B), connect Red leads to Purple and Black wires of rear body harness side fuel tank sending unit connector.
  2. Set IP tester resistance to zero ohms, then 45 ohms, then 90 ohms. Fuel gauge should indicate empty, near half full, then full. If fuel gauge indicates as specified, ensure connection is good. If connection is okay, replace fuel tank sending unit. If fuel gauge does not indicate as specified, go to next step.
  3. If fuel gauge does not indicate as specified, connect Tech 1 Scan Tester (94-00101-A or T-1). Using Central Control Module (CCM) diagnostics, display fuel in gallons. Compare IP tester and Tech 1 starting with zero ohms (empty). Set IP tester resistance to zero ohms, then 45 ohms, then 90 ohms. Tech 1 should display zero to one gallon (empty), 9.5 to 10.5 gallons (half full) and 19.5 to 20.5 gallons (full) as IP tester resistance changes. If display is as specified, repair instrument panel cluster. If display is not as specified, go to next step.
  4. Disconnect IP tester. Connect test light to battery voltage and probe Black wire at fuel tank sending unit connector. If test light does not come on, repair open ground in Black wire. If test light comes on, check for a short to battery voltage, open or short to ground in Purple wire between fuel tank sending unit and CCM. If Purple wire is okay, replace Central Control Module (CCM).
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