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Home >> Lexus >> 2006 >> RX 400h AWD >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Vehicle Control (P310) - RX400H - DTC P0336-137 Through P0A32-666 >> DTC P0A1D-187 Hybrid Powertrain Control Module >> Monitor Description

Monitor Description

The HV control ECU performs diagnostic monitoring to verify proper operation of internal and external ECU systems. In one of these diagnostics, the HV control ECU monitors the important RAM circuits of the HV control ECU. If the HV control ECU detects an error in the important RAM circuits, it will conclude that there is an internal malfunction in the HV control ECU. The HV control ECU will illuminate the MIL and set a DTC.

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