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Home >> Lexus >> 2002 >> SC 430 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1645: Gateway Ecu Malfunction >> Circuit Description

Circuit Description

ECM uses electrical load information from Gateway Electronic Control Unit (ECU) and A/C state from A/C ECU in order to control idle speed. DTC P1645 is set when ECM does not receive communication from body ECU and A/C ECU for 10 seconds or more. Possible causes are:

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