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.

Are there any other codes (besides DTC P3115) being output?
1. YES: Go to relevant DTC chart.
2. NO: Go to next step.
Check for open and short in wire harness between HV ECU terminals (V+, IB V-) and system main relay terminals (6, 7, 2).
PREPARATION:
1. Disconnect the connector from the battery ECU.
2. Disconnect the connector from the system main relay.
CHECK:

Check that the wire harness between the battery ECU and the system main relay is short and open.

OK:

No short and open
1. NG: Repair or replace the wire harness.
2. OK: Go to next step.
Check resistance of HV battery current sensor (In system main relay).
CHECK:

Using an ohmmeter, measure the resistance between terminals.

OK:

Standard resistance:

Fig 1: Identifying HV Battery Current Sensor Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: HV Battery Current Sensor Terminal Specifications
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Replace the system main relay.
2. OK: Go to next step.
Check fitting of connector S8 of system main relay and correct if necessary.