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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 20 (Engine Control System Self-Diagnostics) >> Diagnostic Tests >> DTC P1636: HV Ecu Malfunction >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2002 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.

The Hybrid Vehicle Electronic Control Unit (HV ECU) communicates with the ECM over the HTE + and HTE- circuits. DTC is set when communication between HV ECU and ECM is interrupted for 1.5 seconds or more. Possible causes are:

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