P2519

HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM: P2519-766: A/C Request "A" Circuit
P2519-766 - A/C Request "A" Circuit

DESCRIPTION

The hybrid vehicle converter (DC/DC converter) sends IDH signals to the hybrid vehicle control ECU to inform the ECU of the cooling fan operation condition and the output current limitation condition due to overheating.





WIRING DIAGRAM





INSPECTION PROCEDURE

CAUTION:
- Before inspecting the high-voltage system or disconnecting the low voltage connector of the inverter with converter assembly, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.
- After disconnecting the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting for 10 minutes, check the voltage at the terminals in the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work.
HINT
Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

PROCEDURE

1. CHECK DTC OUTPUT (HV)

(a) Connect the Techstream to the DLC3.

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

(c) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

(d) Check if DTCs are output.

Result:









B -- GO TO DTC CHART Hybrid Control System
A -- Continue to next step.

2. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONVERTER CONNECTOR) P0A09

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

3. CHECK CONNECTOR CONNECTION CONDITION (BATTERY SMART UNIT CONNECTOR)

CAUTION:
Be sure to wear insulated gloves.

(a) Check that the service plug grip is not installed.

NOTICE:
After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

(b) Check the connection of the battery smart unit connectors.





OK:

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

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

4. CHECK BATTERY SMART UNIT

CAUTION:
Be sure to wear insulated gloves.

(a) Check that the service plug grip is not installed.

NOTICE:
After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

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

(c) Connect an oscilloscope between the battery smart unit terminals specified in the table below, and measure the waveform.





Text in Illustration









Result:





HINT
The frequency of the waveform differs according to operation conditions of the cooling fan of the hybrid vehicle converter.

Turn the power switch off.

B -- REPLACE BATTERY SMART UNIT Components
A -- Continue to next step.

5. CHECK BATTERY SMART UNIT

CAUTION:
Be sure to wear insulated gloves.

(a) Check that the service plug grip is not installed.





NOTICE:
After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

(b) Disconnect connector z17 from the hybrid vehicle converter.

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

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

Standard Voltage:





Result:





Text in Illustration





(e) Turn the power switch off.

(f) Connect the hybrid vehicle converter connector.

B -- REPLACE HYBRID VEHICLE CONVERTER Components
A -- Continue to next step.

6. CHECK HARNESS AND CONNECTOR (BATTERY SMART UNIT - HYBRID VEHICLE CONVERTER)

CAUTION:
Be sure to wear insulated gloves.

(a) Check that the service plug grip is not installed.





(b) Disconnect connector z15 from the battery smart unit connector.

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

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

Standard Voltage:





NOTICE:
Turning the power switch on (IG) with the hybrid vehicle converter (DC/DC converter) 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 (Check for Open):





Standard Resistance (Check for Short):





Text in Illustration





(g) Connect the battery smart unit connector.

(h) Connect the hybrid vehicle converter connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE BATTERY SMART UNIT Components