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Home >> Toyota >> 2004 >> Matrix Base, FWD, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 130 (Engine Control System Self Diagnostics) >> Diagnostic Tests >> DTC P1645: Multiplex Communication Malfunction >> Circuit Description
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Circuit Description

WARNING: This page is about a different car, the 2003 Toyota MR2. However, it is still accessible from the selected car via links, so may be relevant.

ECM receives the operating condition of A/C system from the instrument cluster. ECM also receives electrical load information from the body ECM over the bus communications system from the instrument cluster. ECM uses this information to control engine idle speed.

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