DTC P3110-139: IGCT Relay Malfunction: Procedure

1. Disconnect connector A74 from the hybrid vehicle control ECU.
2. Turn the power switch on (IG).
3. Measure the voltage according to the value(s) in the table below.
   Fig 1: A74 Connector

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   NOTE:

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

   Standard voltage

   Tester Connection	Switch Condition	Specified Condition
   A74-3 (MREL) - Body ground	Power switch on (IG)	Below 1 V

NG → See step   2 

OK → See step   4 

1. Turn the power switch off.
2. Remove the IGCT2 relay from the engine room No. 2 relay block.
   Fig 2: Identifying IGCT2 Relay

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3. Measure the resistance according to the value(s) in the table below.
   Fig 3: Inspecting IGCT2 Relay

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   Standard resistance

   Tester Connection	Condition	Specified Condition
   1 - 2	Always	Below 1 Ω
   3 - 5	Battery voltage is not applied between terminals 1 and 2.	10 kΩ or higher
   	Battery voltage is applied between terminals 1 and 2.	Below 1 Ω

NG → REPLACE RELAY (IGCT2 RELAY) 

OK: Go to next step 

1. Turn the power switch off.
2. Remove the IGCT relay from the engine room No. 2 relay block.
   Fig 4: Identifying IGCT Relay

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3. Measure the resistance according to the value(s) in the table below.
   Fig 5: Inspecting IGCT Relay

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   Standard resistance

   Tester Connection	Condition	Specified Condition
   1 - 2	Always	Below 1 Ω
   3 - 5	Battery voltage is not applied between terminals 1 and 2.	10 kΩ or higher
   	Battery voltage is applied between terminals 1 and 2.	Below 1 Ω

NG → CHECK RELAY (IGCT RELAY) 

OK → REPAIR OR REPLACE HARNESS OR CONNECTOR