P2603

HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM: P2603-768: Oil Pump Control Circuit High
P2603-768 - Oil Pump Control Circuit High

DESCRIPTION

The power management control ECU (HV CPU) detects the MG1 and MG2 temperature based on signals from the generator and motor temperature sensors and activates the OIL PMP relay and oil pump driver (oil pump with motor assembly).

The power management control ECU (HV CPU) monitors OPST signals from the oil pump driver and detects malfunctions.





WIRING DIAGRAM





INSPECTION PROCEDURE

HINT
When troubleshooting the oil pump with motor assembly, check for the following conditions.

- ATF temperature inside the oil cooler is 41°F (5°C) or more.
- The ambient temperature sensor value is 41°F (5°C) or more.
PROCEDURE

1. CHECK FUSE (OIL PMP)

(a) Remove the OIL PMP fuse from the engine room relay block No. 3.

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





Standard Resistance:





Text in Illustration





(c) Install the OIL PMP fuse.

NG -- REPLACE FUSE (OIL PMP)
OK -- Continue to next step.

2. CHECK RELAY (OIL PMP)

(a) Remove the OIL PMP relay from the engine room relay block No. 3.

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





Standard Resistance:





(c) Install the OIL PMP relay.

NG -- REPLACE RELAY (OIL PMP)
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - OIL PUMP RELAY - OIL PUMP)

(a) Remove the OIL PMP relay from the engine room relay block No. 3.

(b) Disconnect the A75 connector from the oil pump with motor assembly.

(c) Disconnect the A80 connector from the power management control ECU.

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





Standard Resistance (Check for Open):





Standard Resistance (Check for Short):





Text in Illustration





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

Standard Resistance (Check for Open):





Standard Resistance (Check for Short):





(f) Connect the power management control ECU connector.

(g) Connect the oil pump with motor assembly connector.

(h) Install the OIL PMP relay.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

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

(a) Disconnect the A75 connector from the oil pump with motor assembly.

(b) Disconnect the A80 connector from the power management control ECU.

(c) Turn the power switch on (IG).

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





Standard Voltage:





Text in Illustration





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

(e) Turn the power switch off.

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

Standard Resistance:





(g) Connect the power management control ECU connector.

(h) Connect the oil pump with motor assembly connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

5. CHECK POWER MANAGEMENT CONTROL ECU

(a) Turn the power switch on (IG).

(b) Enter inspection mode Component Tests and General Diagnostics.

HINT
Entering inspection mode activates the oil pump with motor assembly.

(c) Turn the power switch on (READY).

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





Standard Voltage:





Text in Illustration





(e) Turn the power switch off.

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

Standard Resistance:





(g) Turn the power switch off.

NG -- REPLACE POWER MANAGEMENT CONTROL ECU Components

OK -- REPLACE OIL PUMP WITH MOTOR ASSEMBLY