DTC P2603-768: Oil Pump Control Circuit High: Procedure

NG → REPLACE FUSE (OIL PMP) 

OK: Go to next step 

NG → REPLACE RELAY (OIL PMP) 

OK: Go to next step 

1. Disconnect connector A58 from the hybrid vehicle control ECU.
2. Disconnect connector from the oil pump with motor assembly.
3. Remove the OIL PMP relay from the engine room junction block assembly.
4. Measure the resistance according to the value(s) in the table below.
   Fig 1: Identifying A58 Hybrid Vehicle Control ECU, A15 Oil Pump With Motor Assembly & OIL PMP Relay

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance (Check for Open)

   Tester Connection	Switch Condition	Specified Condition
   A58-6 (OPM2) - OIL PMP relay terminal 1	Power switch off	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Switch Condition	Specified Condition
   A58-6 (OPM2) or OIL PMP relay terminal 1 - Body ground and other terminals	Power switch off	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Hybrid Vehicle Control ECU)
   *2	Front view of wire harness connector (to Oil Pump with Motor Assembly)
   *3	Engine Room Junction Block Assembly
   *4	OIL PMP relay

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

   Standard Resistance (Check for Open)

   Tester Connection	Switch Condition	Specified Condition
   A15-4 (L) - OIL PMP relay terminal 5	Power switch off	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Switch Condition	Specified Condition
   A15-4 (L) or OIL PMP relay terminal 5 - Body ground and other terminals	Power switch off	10 kΩ or higher

6. Install the OIL PMP relay.
7. Connect the oil pump with motor assembly connector.
8. Connect the hybrid vehicle control ECU connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect connector A58 from the hybrid vehicle control ECU.
2. Disconnect connector from the oil pump with motor assembly.
3. Turn the power switch on (IG).
4. Measure the voltage according to the value(s) in the table below.
   Fig 2: Identifying A58 From The Hybrid Vehicle Control ECU & A15 Oil Pump With Motor Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A58-26 (OPST) or A15-2 (OPST) - Body ground and other terminals	Power switch on (IG)	Below 1 V

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Hybrid Vehicle Control ECU)
   *2	Front view of wire harness connector (to Oil Pump with Motor Assembly)

   NOTE:

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

5. Turn the power switch off.
6. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   A58-26 (OPST) - A15-2 (OPST)	Power switch off	Below 1 Ω

7. Connect the oil pump with motor assembly connector.
8. Connect the hybrid vehicle control ECU connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Replace the oil pump with motor assembly. Refer toCOMPONENTS .

NEXT: Go to next step 

NEXT: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (READY).
3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
4. Check if DTCs are output.

   Result

   Result	Proceed to
   DTC P2603-768 is not output.	A
   DTC P2603-768 is output again.	B

5. Turn the power switch off.

B → See step   9 

A: Go to next step 

1. Check for intermittent problems. Refer toCHECK FOR INTERMITTENT PROBLEMS .

NG → REPAIR OR REPLACE MALFUNCTIONING PARTS 

OK → COMPLETED