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Home >> Lexus >> 2008 >> RX 400h AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 158 (Hybrid Vehicle Control (P310) - RX400H - DTC P0336-137 Through P0A32-666) >> DTC P0A1D-721 Hybrid Powertrain Control Module; DTC P0A1D-722 Hybrid Powertrain Control Module; DTC P0A1D-723 Hybrid Powertrain Control Module; DTC P0A1D-724 Hybrid Powertrain Control Module; DTC P0A1D-787 Hybrid Powertrain Control Module >> Monitor Description

Monitor Description

WARNING: This page is about a different car, the 2006 Lexus RX 400h. However, it is still accessible from the selected car via links, so may be relevant.

The HV control ECU performs many diagnostic tests to verify proper operation of internal ECU systems. In one of these diagnostics, the HV control ECU checks the result of the engine CPU self-test. If the HV control ECU detects a "Fail" from the engine CPU self-test, it will conclude that there is an internal malfunction in the engine CPU. The HV control ECU will illuminate the MIL and set a DTC.

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