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Home >> Genesis >> 2021 >> G90 5.0 Ultimate, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 5 (Engine Control System Diagnosis - 3.3L (6 Of 9)) >> DTC P0599-00: Thermostat Heater Control Circuit High >> Component Inspection

Component Inspection

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  1. Turn "OFF" the ignition.
  2. Disconnect the electrical thermostat connector.
  3. Measure the resistance between the power and control terminal of electrical thermostat. (Component side)

    Specification: 

    Temperature Resistance
    20 ± 5°C (68 ± 9°F) 11.2 ± 0.6 Ω
  4. Is the measured resistance within specification?

    YES 

    • Check for poor connection between ECM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.

    NO 

    • Substitute with a known-good component and check for proper operation. If the problem is corrected, replace component and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.