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Test No. 12: Fuel Level Warning Light Stays On With Engine Running

WARNING: This page is about a different car, the 2002 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ensure ignition switch is in LOCK position. Disconnect negative battery cable. After more than 30 seconds, reconnect negative battery cable. Cycle ignition switch to ON position, then LOCK position, 3 times. Turn ignition switch to ON position. Push trip reset button 3 times. Push trip reset button until DTC 16 is reached. If fuel level warning light turns on and off 3 times, go to next step. If fuel level warning light does not turn on and off 3 times, go to step  6 . See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION.
  2. Push trip reset button until DTC 22 is reached. If LCD indicates 255, go to next step. If LCD does not indicate 255, replace fuel gauge sending unit.
  3. Disconnect fuel pump connector. Check for continuity between ground and fuel pump harness connector terminal "C". See Figure . If continuity exists, go to next step. If continuity does not exist, repair wiring between fuel gauge and ground. See WIRING DIAGRAMS  .
  4. Connect ground to fuel pump connector terminal "B". Remove instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Check for continuity between ground and instrument cluster harness connector No. 2, terminal 2E. See Figure . If continuity exists, go to next step. If continuity does not exist, repair wiring between instrument cluster and fuel gauge sending unit.
  5. Disconnect instrument cluster connector. Check for continuity between instrument cluster connector No. 2, terminal 2E and instrument cluster connector No. 4, terminal 4F. If continuity exists, replace instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. If continuity does not exist, replace printed circuit. See PRINTED CIRCUIT  under REMOVAL & INSTALLATION.
  6. Remove fuel level warning light bulb. Inspect bulb. If bulb is okay, replace instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. If bulb is bad, replace bulb.
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