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Calibration Test Using Tester

  1. Disconnect connector from temperature sender and connect to Rotunda Gauge Tester No. 021-00055. Attach other tester lead to ground on vehicle. Turn ignition switch to ACC position. Turn tester switch to IVR CHECK position. A flashing light indicates IVR and wiring are functional.
  2. Place tester switch in LOW (73 ohms) position. If gauge does not move, go to step 3). If gauge reads "C", set gauge tester to HIGH (9.7 ohms) position. If gauge reads "H", replace sender. If gauge does not read "H", go to step 3).
  3. Check sender circuit wiring for shorts and opens with ohmmeter. If wiring is okay, replace gauge. If wiring is shorted or open, repair wiring as necessary. See appropriate chassis wiring diagram in the WIRING DIAGRAMS section.
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