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Engine Coolant Temperature Gauge Circuit

NOTE: If not using the hand-held tester, start the inspection from step  2.
  1. Perform active test. Connect the hand-held tester to the DLC3. See Figure. Enter into the ACTIVE TEST function of the hand-held tester. Check that the probe moves as the hand-held tester directs in each range. If the gauge operates normally, replace the A/C and combination meter integrated ECU. See COMBINATION METER  under REMOVAL & INSTALLATION. If the gauge does not operate normally, go to the next step.
  2. Check the DTC of the engine. If DTC P0115/22 or P0116/22 is output from the engine, repair the circuit indicated by the output code. See appropriate SELF-DIAGNOSTICS - RX300 article in ENGINE PERFORMANCE. If DTC P0115/22 or P0116/22 is not output, go to then next step.
  3. Check the engine coolant temperature receiver gauge. See ENGINE COOLANT TEMPERATURE RECEIVER GAUGE  under COMPONENT TESTS. If the results are OK, check and replace the combination meter circuit plate. See COMBINATION METER  under REMOVAL & INSTALLATION. If the results are not good, replace the engine coolant temperature receiver gauge.
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