DTC P3110-139: IGCT Relay Malfunction; DTC P3110-223: IGCT Relay Malfunction: Procedure

1. Remove the IGCT relay from the engine room junction block assembly.
   Fig 1: Identifying IGCT Relay Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

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

   TEXT IN ILLUSTRATION
   
   

   *1	IGCT Relay

3. Install the IGCT relay.

NG → REPLACE RELAY (IGCT RELAY) 

OK: Go to next step 

1. Disconnect connector A58 from the hybrid vehicle control ECU connector.
2. Remove the IGCT relay from the engine room junction block assembly.
3. Turn the power switch on (IG).
4. Measure the voltage according to the value(s) in the table below.
   Fig 2: Identifying IGCT Relay From The Engine Room Junction Block Assembly & A58 Hybrid Vehicle Control ECU

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Hybrid Vehicle Control ECU)	*2	Engine Room Junction Block Assembly
   *3	IGCT Relay	-	-

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   A58-93 (MREL) - Body ground	Power switch on (IG)	Below 1 V
   A58-2 (+B1) - Body ground	Power switch on (IG)	Below 1 V
   A58-1 (+B2) - Body ground	Power switch on (IG)	Below 1 V

   NOTE:

   Turning the power switch on (IG) with the hybrid vehicle control ECU connectors disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

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

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   3