DTC C2303: Short in Power Source Relay Circuit: Procedure

1. Disconnect connector D2 from the shift control actuator assembly.
2. Measure the voltage according to the value(s) in the table below.
   Fig 1: Identifying Shift Control Actuator Assembly (Shift Control Actuator Assembly Power Source Circuit)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   D2-2 (BMA) - Body ground	Power switch off	Below 1 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Shift Control Actuator Assembly)

3. Connect the shift control actuator assembly connector.

NG → See step   3 

OK: Go to next step 

1. Disconnect connector A23 from the transmission control ECU assembly.
2. Disconnect connector D2 from the shift control actuator assembly.
3. Measure the resistance according to the value(s) in the table below.
   Fig 2: Checking Harness And Connector (Transmission Control ECU Assembly - Shift Control Actuator)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance (Check for Short)

   Tester Connection	Switch Condition	Specified Condition
   A23-5 (MUA) or D2-1 (MUA) - Body ground and other terminals	Power switch off	10 kΩ or higher
   A23-2 (MVA) or D2-6 (MVA) - Body ground and other terminals	Power switch off	10 kΩ or higher
   A23-1 (MWA) or D2-7 (MWA) - Body ground and other terminals	Power switch off	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Transmission Control ECU Assembly)
   *b	Front view of wire harness connector (to Shift Control Actuator Assembly)

4. Connect the shift control actuator assembly connector.
5. Connect the transmission control ECU assembly connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   6 

1. Remove the P CON MTR relay (transaxle parking lock control relay) from the engine room junction block assembly.
   Fig 3: Identifying P Con Mtr Relay (Transaxle Parking Lock Control Relay)

   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	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

3. Reinstall the P CON MTR relay (transaxle parking lock control relay).

NG → REPLACE P CON MTR RELAY (TRANSAXLE PARKING LOCK CONTROL RELAY) 

OK: Go to next step 

1. Disconnect connector A23 from the transmission control ECU assembly.
2. Remove the P CON MTR relay (transaxle parking lock control relay) from the engine room junction block assembly.
3. Measure the resistance according to the value(s) in the table below.
   Fig 4: Identifying Harness And Connector (Transmission Control ECU Assembly - P Con Mtr Relay)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance (Check for Short)

   Tester Connection	Switch Condition	Specified Condition
   A23-23 (BMA) - Body ground and other terminals	Power switch off	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Transmission Control ECU Assembly)

4. Reinstall the P CON MTR relay (transaxle parking lock control relay).
5. Connect the transmission control ECU assembly connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect connector D2 from the shift control actuator assembly.
2. Remove the P CON MTR relay (transaxle parking lock control relay) from the engine room junction block assembly.
3. Measure the resistance according to the value(s) in the table below.
   Fig 5: Checking Harness And Connector (Shift Control Actuator Assembly - P Con Mtr Relay)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance (Check for Short)

   Tester Connection	Switch Condition	Specified Condition
   D2-2 (BMA) - Body ground and other terminals	Power switch off	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Shift Control Actuator Assembly)

4. Reinstall the P CON MTR relay (transaxle parking lock control relay).
5. Connect the shift control actuator assembly connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   7