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Home >> Toyota >> 1999 >> 4Runner Base, 4WD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Component Tests >> Engine Coolant Temperature Gauge & Sender >> Wiring Harness Operational Test

Wiring Harness Operational Test

  1. Disconnect coolant temperature sender connector. See ENGINE COOLANT TEMPERATURE SENDER LOCATION  table. Turn ignition switch to ON position. Temperature gauge should indicate COOL. Turn ignition switch to OFF position. Connect a 12-volt, 3.4-watt test light between coolant temperature sender harness connector terminal and ground.
  2. Turn ignition switch to ON position. Test light should be on and temperature gauge should slowly move to HOT. If gauge functions as specified, replace sending unit. If gauge does not function as specified, perform TEMPERATURE GAUGE RESISTANCE TEST .
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