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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 336 (Hybrid Vehicle Control System - Diagnostics) >> Circuit Inspection >> DTC P3115: System Main Relay Malfunction >> Circuit Description - DTC P3115 - Information Codes 224, 225, 226, 227, 228, 229 >> Inspection Procedure

Inspection Procedure

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.
  1. Check for open, short and +B short in wire harness between HV ECU terminals (Cont1, Cont2, Cont3) and system main relay terminals  . See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION .
    NOTE: Confirm that there is no open circuit in the wire harness. If the battery voltage is always applied to the HV ECU Cont1, Cont2 and Cont3 terminals with the ignition ON ("READY" light OFF), the system main relay has +B short.
    1. NG:  Repair or replace wire harness.
    2. OK:  Go to step  2.
  2. Is any of the information code 231, 232 or 233 recorded? 
    1. NO:  Replace HV ECU.
    2. YES  : Replace HV ECU and system main relay.
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