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

1. Remove the integration relay from the engine room R/B No. 1.
   Fig 1: Identifying Integration Relay Connectors Terminals

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

   Standard resistance

   Tester Connection	Specified Condition
   1W-1 - 1V-8	10 kΩ or more
   1V-5 - 1V-8	10 kΩ or more

3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Specified Condition
   1W-1 - 1V-8	Below 1 Ω (Apply battery voltage between 1V-6 and 1V-7)
   1V-5 - 1V-8	Below 1 Ω (Apply battery voltage between 1V-6 and 1V-7)

NG → REPLACE INTEGRATION NO. 1 RELAY 

OK: Go to next step 

1. Disconnect the hybrid vehicle control ECU connector.
2. Remove the integration relay from the engine room R/B No. 1.
3. Turn the power switch on (IG).
4. Measure the voltage according to the value(s) in the table below.
   Fig 2: Identifying A54 And Integration Relay Connectors Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   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.

   Standard voltage

   Tester Connection	Specified Condition
   MREL (A54-21) - Body ground	Below 1 V
   +B1 (A54-46) - Body ground	Below 1 V
   +B2 (A54-23) - Body ground	Below 1 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   3