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 IGCT relay.
Preparation:

Remove the IGCT relay from the engine room R/B No. 3.

Check:
1. Using an ohmmeter, check that there is continuity between terminals 1 and 2.
2. Check that there is no continuity between terminals 3 and 5.
3. Apply battery voltage across terminals 1 and 2. Using an ohmmeter, check that there is continuity between terminals 3 and 5.
OK:
1. a has continuity .
2. b has no continuity .
3. c has continuity .
1. NG: Replace IGCT relay.
2. OK: Check for +B short in wire harness between HV ECU and IGCT relay (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION ) Repair or replace wire harness.
NOTE: The HV ECU MREL terminal has +B short if the battery voltage is always applied to the HV ECU +B1 or MREL terminal with the ignition OFF.