ECU Power Source Circuit

HYBRID / BATTERY CONTROL: PLUG-IN CHARGE CONTROL SYSTEM: ECU Power Source Circuit
- ECU Power Source Circuit

DESCRIPTION

When the power switch is turned on (IG), current flows from the IG2D terminal of the power management control ECU to the IG2 relay. This closes the IG2 relay contact points and sends the IG2 signal to the IG2 terminal of the plug-in charge control ECU assembly. The plug-in charge control ECU assembly supplies the charging power to the +B1 terminal by allowing current to flow into the MREL terminal and closing the PIMR relay. However, during plug-in charging, only the PIMR relay is closed and the IG2 relay is open.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK PLUG-IN CHARGE CONTROL ECU ASSEMBLY (IG2 TERMINAL VOLTAGE)

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

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





Standard Voltage:





Text in Illustration





(c) Turn the power switch off.

NG -- CHECK HARNESS AND CONNECTOR (PLUG-IN CHARGE CONTROL ECU ASSEMBLY - IG2 RELAY)
OK -- Continue to next step.

2. CHECK PLUG-IN CHARGE CONTROL ECU ASSEMBLY (+B1 TERMINAL VOLTAGE)

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

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





Standard Voltage:





Text in Illustration





(c) Turn the power switch off.

NG -- CHECK HARNESS AND CONNECTOR (PLUG-IN CHARGE CONTROL ECU ASSEMBLY - BODY GROUND)

OK -- GO TO PROBLEM SYMPTOMS TABLE Problem Symptoms Table

3. CHECK HARNESS AND CONNECTOR (PLUG-IN CHARGE CONTROL ECU ASSEMBLY - IG2 RELAY)

(a) Remove the No. 2 integration relay from the engine room relay block and junction block assembly.

(b) Disconnect connector S31 from the plug-in charge control ECU assembly.

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





Standard Resistance:









(d) Install the No. 2 integration relay.

(e) Connect the plug-in charge control ECU assembly connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- CHECK ECU POWER SOURCE CIRCUIT (HYBRID CONTROL SYSTEM) ECU Power Source Circuit

4. CHECK HARNESS AND CONNECTOR (PLUG-IN CHARGE CONTROL ECU ASSEMBLY - BODY GROUND)

(a) Disconnect connector S31 from the plug-in charge control ECU assembly.

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





Standard Resistance:





Text in Illustration





(c) Connect the plug-in charge control ECU assembly connector.

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

5. CHECK PLUG-IN CHARGE CONTROL ECU ASSEMBLY (MREL TERMINAL VOLTAGE)

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

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





Standard Voltage:





Text in Illustration





(c) Turn the power switch off.

NG -- REPLACE PLUG-IN CHARGE CONTROL ECU ASSEMBLY Components
OK -- Continue to next step.

6. CHECK FUSE (PIMR)

(a) Remove the PIMR fuse from the engine room relay block and junction block assembly.





Text in Illustration





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

Standard Resistance:





(c) Install the PIMR fuse.

NG -- CHECK HARNESS AND CONNECTOR (PIMR RELAY - PIMR FUSE)
OK -- Continue to next step.

7. INSPECT RELAY (PIMR)

(a) Remove the PIMR relay from the relay block assembly.

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





Standard Resistance:





(c) Install the PIMR relay.

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

8. CHECK HARNESS AND CONNECTOR (PIMR RELAY - PIMR FUSE)

(a) Remove the PIMR fuse from the engine room relay block and junction block assembly.





Text in Illustration





(b) Remove the PIMR relay from the relay block assembly.

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





Text in Illustration





Standard Resistance:





(d) Install the PIMR relay.

(e) Install the PIMR fuse.

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

9. CHECK HARNESS AND CONNECTOR (PIMR RELAY - PLUG-IN CHARGE CONTROL ECU ASSEMBLY)

(a) Remove the PIMR relay from the relay block assembly.

(b) Disconnect connector S31 from the plug-in charge control ECU assembly.

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





Text in Illustration





Standard Resistance:





(d) Connect the plug-in charge control ECU assembly connector.

(e) Install the PIMR relay.

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

10. CHECK HARNESS AND CONNECTOR (PIMR RELAY - PLUG-IN CHARGE CONTROL ECU ASSEMBLY)

(a) Remove the PIMR relay from the relay block assembly.

(b) Disconnect connector S31 from the plug-in charge control ECU assembly.

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





Text in Illustration





Standard Resistance:





(d) Connect the plug-in charge control ECU assembly connector.

(e) Install the PIMR relay.

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

11. CHECK HARNESS AND CONNECTOR (PIMR RELAY - BODY GROUND)

(a) Remove the PIMR relay from the relay block assembly.

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





Standard Resistance:





Text in Illustration





(c) Install the PIMR relay.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- CHECK FOR INTERMITTENT PROBLEMS Check For Intermittent Problems

12. CHECK HARNESS AND CONNECTOR (PIMR RELAY - PIMR FUSE)

(a) Remove the PIMR fuse from the engine room relay block and junction block assembly.





Text in Illustration





(b) Remove the PIMR relay from the relay block assembly.

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





Text in Illustration





Standard Resistance:





(d) Install the PIMR relay.

(e) Install the PIMR fuse.

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

13. CHECK HARNESS AND CONNECTOR (PIMR RELAY - PLUG-IN CHARGE CONTROL ECU ASSEMBLY)

(a) Remove the PIMR relay from the relay block assembly.

(b) Disconnect connector S31 from the plug-in charge control ECU assembly.

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





Text in Illustration





Standard Resistance:





(d) Install the PIMR relay.

(e) Connect the plug-in charge control ECU assembly connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE FUSE (PIMR)

14. REPAIR OR REPLACE HARNESS OR CONNECTOR

NEXT -- REPLACE FUSE (PIMR)

15. REPAIR OR REPLACE HARNESS OR CONNECTOR

NEXT -- REPLACE FUSE (PIMR)