DTC P3110-223: IGCT Relay Malfunction: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Move the shift lever to a position other than P.
4. Leave the vehicle as is for approximately 1 second.
5. Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
6. Check if DTCs are output.

   Result

   Result	Proceed to
   P3110-223 only is output.	A
   Any of the following DTCs are also output.	B

   DTC No.	Relevant Diagnosis
   P0705-757	Transmission Range Sensor Circuit
   P0851-775	Park / Neutral Switch Input Circuit Low
   P0867-882	Transmission Fluid Pressure
   P2721-853	Pressure Control Solenoid Circuit High Voltage

7. Move the shift lever to the P position.

B → See step   5 

A: Go to next step 

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

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3. Measure the resistance according to the value(s) in the table below.
   Fig 2: Inspecting IGCT2 Relay

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance

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

NG → REPLACE RELAY (IGCT2 RELAY) 

OK: Go to next step 

1. Disconnect connector A76 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 3: Checking Harness And Connector (Hybrid Vehicle Control ECU -- Engine Room No. 2 Relay Block)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   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	Condition	Specified Condition
   A76-1 (+B1), A76-2 (+B2) or Engine room No. 2 relay block terminal 3 - Body ground	Power switch on (IG)	Below 1 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   4