L110F Hybrid Vehicle Control: Hybrid Control System

L110F HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: P0560-117: System Voltage
P0560-117 - System Voltage

DESCRIPTION

Battery power is constantly supplied to the BATT terminal of the hybrid vehicle control ECU to allow DTCs and freeze frame data to be retained in memory even though the power switch is turned off. The back-up power is supplied even when the power switch is off.





MONITOR DESCRIPTION

If a period of time has elapsed with a low voltage at the BATT terminal of the hybrid vehicle control ECU, the hybrid vehicle control ECU will determine that a malfunction has occurred in the back-up power supply system, and it will set a DTC. The MIL will illuminate the next time the engine is started.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





COMPONENT OPERATING RANGE





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR)

(a) Check the connections of the hybrid vehicle control ECU connectors.

OK:

The connectors are connected securely and there are no contact problems.

NG -- CONNECT SECURELY
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - IGCT2 FUSE)

(a) Turn the power switch off.





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

Standard voltage:





NG -- CHECK FUSE (IGCT2 FUSE)

OK -- REPLACE HYBRID VEHICLE CONTROL ECU Components

3. CHECK FUSE (IGCT2 FUSE)

(a) Check if there is an open circuit in the fuse (IGCT2) in the engine room No. 2 relay block.





OK:

There is no open circuit in the fuse (IGCT2).

NG -- REPLACE FUSES (IGCT2)
OK -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (IGCT2 FUSE - BATTERY POSITIVE TERMINAL)

(a) Disconnect the auxiliary battery negative terminal cable.

(b) Disconnect the auxiliary battery positive terminal cable.

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





Standard resistance (Check for open):





Standard resistance (Check for short):





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

5. CHECK HARNESS AND CONNECTOR (IGCT2 FUSE - HYBRID VEHICLE CONTROL ECU)

(a) Disconnect connector A74 from the hybrid vehicle control ECU.

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





Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE HYBRID VEHICLE CONTROL ECU Components