DTC P3110-223: IGCT Relay Malfunction: Procedure

1. Remove the IGCT MAIN relay from the engine room relay block No. 2.
2. Measure the resistance according to the value(s) in the table below.
   Fig 1: Identifying IGCT Main Relay

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3 - 5	Auxiliary battery voltage is not applied between terminals 1 and 2	10 kΩ or higher

3. Install the IGCT MAIN relay.

NG → REPLACE RELAY (IGCT MAIN) 

OK: Go to next step 

1. Remove the IGCT MAIN relay from the engine room relay block No. 2.
2. Disconnect connectors A65 and A66 from the hybrid vehicle control ECU.
3. Turn the ignition switch to ON.
4. Measure the voltage according to the value(s) in the table below.
   Fig 2: Checking Harness And Connector (Hybrid Vehicle Control ECU - Engine Room Relay Block No. 2)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *a	Component without IGCT MAIN relay connected (Engine Room Relay Block No. 2)
   *b	Rear view of wire harness connector (to Hybrid Vehicle Control ECU)

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   A66-5 (+B1), A65-2 (+B2) or 3 (IGCT MAIN relay) - Body ground	Ignition switch ON	Below 1 V

   NOTE:

   Turning the ignition switch to ON with the connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

5. Turn the ignition switch off.
6. Install the IGCT MAIN relay.
7. Connect the hybrid vehicle control ECU connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   3