P2603-768

DESCRIPTION

Refer to the description for DTC P2601-777. (Click here)

DTC No.	INF No.	DTC Detection Condition	Trouble Area
P2603	768	Open or +B short in oil pump driver circuit When OPM2 signal is ON, OPST signal remains Hi	Wire harness or connector Oil pump w/ motor assembly HV control ECU

WIRING DIAGRAM

Refer to the wiring diagram for DTC P2601-777. (Click here)

INSPECTION PROCEDURE

NOTICE:

1. When troubleshooting the oil pump w/ motor assembly, check for the following conditions.
   
1. ATF temperature inside the oil cooler is 5°C (41 °F) or more.
   
2. Value of the ambient temperature sensor is 5°C (41 °F) or more.
   

1. INSPECT OIL PUMP FUSE

1. Remove the oil pump fuse from the engine room R/B No.4.

2. Check continuity of the oil pump fuse.

   OK:

   There is continuity.
   

NG	REPLACE OIL PUMP FUSE

OK

2. INSPECT OIL PUMP RELAY

1. Remove the oil pump relay from the engine room R/B No.4.

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

   Standard Resistance:

   Tester Connection	Specified Condition
   1 - 2	Below 1 Ω
   3 - 5	10 kΩ or higher
   	Below 1 Ω (Apply battery voltage between terminals 1 and 2)

NG	REPLACE OIL PUMP RELAY

OK

3. CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - OIL PUMP RELAY, OIL PUMP RELAY - OIL PUMP)

1. Remove the oil pump relay from the engine room R/B No.4.

2. Disconnect the O3 oil pump w/ motor assembly connector.

3. Disconnect the H31 HV control ECU connector.

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

   Standard Resistance (Check for open):

   Tester Connection	Specified Condition
   OPM2 (H31-5) - Engine room R/B No.4 OIL PUMP relay terminal 1	Below 1 Ω

   Standard Resistance (Check for short):

   Tester Connection	Specified Condition
   OPM2 (H31-5) or Engine room R/B No.4 OIL PUMP relay terminal 1 - Body ground	10 kΩ or higher

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

   Standard Resistance (Check for open):

   Tester Connection	Specified Condition
   Engine room R/B No.4 OIL PUMP relay terminal 2 - +B (O3-1)	Below 1 Ω

   Standard Resistance (Check for short):

   Tester Connection	Specified Condition
   Engine room R/B No.4 OIL PUMP relay terminal 2 or +B (O3-1) - Body ground	10 kΩ or higher

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4. CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - OIL PUMP)

1. Disconnect the O3 oil pump w/ motor assembly connector.

2. Disconnect the H31 HV control ECU connector.

3. Measure the voltage according to the value(s) in the table below when the ignition switch is in the ON position.

   Standard Voltage:

   Tester Connection	Specified Value
   OPST (H31-7) or STAT (O3-2) - Body ground	Below 1 V

4. Turn the ignition switch off.

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

   Standard Resistance:

   Tester Connection	Specified Condition
   OPST (H31-7) - STAT (O3-2)	Below 1 Ω

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5. INSPECT HYBRID VEHICLE CONTROL ECU

1. Remove the oil pump relay from the engine room R/B No.4.

2. Connect the intelligent tester to the DLC3.

3. Turn the ignition switch to the ON position.

4. Select the following menu items: Powertrain / Hybrid Control /Active Test / Inspection Mode.

5. Put the vehicle into the READY-on state.

6. Measure the voltage according to the value(s) in the table below.

   Standard Voltage:

   Tester Connection	Specified Value
   OPM2 (H31-5) - E1 (H32-5)	10 to 14 V

7. Turn the ignition switch off.

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

   Standard Resistance:

   Tester Connection	Specified Condition
   OPST (H31-7) - +B1 (H31-2)	10 kΩ or higher

NG	REPLACE HYBRID VEHICLE CONTROL ECU

OK
REPLACE OIL PUMP W/MOTOR ASSEMBLY