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Test No. 7: Temperature Gauge Inoperative Or Incorrect

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 25 is reached. If temperature gauge cycles from "H" to center to "C" repeatedly, go to next step. If temperature gauge does not cycle from "H" to center to "C" repeatedly, replace instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION.
  2. Push trip reset button until DTC 24 is reached. If LCD does not indicate 000 or 255, go to step  6 . If LCD indicates 000 or 255, go to next step.
  3. Remove instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Disconnect temperature sending unit connector. Check for continuity between ground and instrument cluster harness connector No. 2, terminal 2H. See Figure . If continuity exists, repair short to ground in wiring between instrument cluster and temperature gauge sending unit. See WIRING DIAGRAMS  . If continuity does not exist, go to next step.
  4. Reconnect temperature sending unit connector. Check for continuity between ground and instrument cluster harness connector No. 2, terminal 2H. If continuity exists, go to next step. If continuity does not exist, go to step  6 .
  5. Disconnect instrument cluster printed circuit connector. Check for continuity between instrument cluster connector No. 2, terminal 2H and instrument cluster connector No. 4, terminal 4D. If continuity exists, go to next step. If continuity does not exist, replace printed circuit. See PRINTED CIRCUIT  under REMOVAL & INSTALLATION.
  6. Remove temperature sending unit. Place sending unit in a container of water and heat gradually. Using an ohmmeter, measure resistance between sending unit terminal and body. With water temperature at 121.7-122.3°F (49.8-50.1°C), resistance should be 189.4-259.6 ohms. If resistance is not as specified, replace temperature sending unit. If resistance is as specified, replace instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION.
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