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.

Check for open and short in wire harness between HV transaxle and HV ECU . See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION .
Terminals for checking open and short:

Fig 1: Identifying Terminals Likely To Incur Shorts Or Opens Between MG2 & HV ECU
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Repair or replace wire harness.
2. OK: Go to step 2.
Is there DTC P3100 being output?
1. YES: Check applicable DTC.
2. NO: Go to step 3.
Is there DTC P3125 being output?
1. YES: Check applicable DTC.
2. NO: Replace HV transaxle motor.