P0A08-264 - DC / DC Converter Status Circuit

L110F HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: P0A08-264: DC / DC Converter Status Circuit
P0A08-264 - DC / DC Converter Status Circuit

DESCRIPTION

For a description of the hybrid vehicle converter (DC/DC converter), P0A09.





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) Select the following menu items: 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 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.

3. CHECK FRAME WIRE (NO. 1 FUSIBLE LINK BLOCK ASSEMBLY SIDE)

CAUTION:
Be sure to wear insulated gloves.

(a) Turn the power switch off.

(b) Remove the service plug grip. Hybrid Control System

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.

(c) Check the connection of the frame wire terminal (No. 1 fusible link block assembly side).





OK:

The terminal is connected securely and there is no contact problem.

(d) Check for arc marks on the frame wire terminals (No. 1 fusible link block assembly side and vehicle wire harness side).

Result:





C -- CONNECT SECURELY

B -- REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA
A -- Continue to next step.

4. CHECK FUSES

(a) Measure the resistance of the headlight system fuses, A/C blower system, defogger system, stop light system and power window system.

OK:

Below 1 Ohms

HINT
If any of the fuses is broken, replace the fuse and repair the shorted circuit.

NG -- REPAIR OR REPLACE SHORTED CIRCUIT AND REPLACE BROKEN FUSE
OK -- Continue to next step.

5. CHECK CONNECTOR CONNECTION CONDITION (NO. 2 BATTERY PACK WIRE CONNECTOR)

(a) Check the connection of the No. 2 battery pack wire connector.





OK:

The connector is connected securely and there are no contact problems.

HINT
For the removal and installation procedures related to inspection of the connection of the No. 2 battery pack wire connector, Removal.

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

6. CHECK HARNESS AND CONNECTOR (RESISTANCE VALUE OF NODD INSIDE HYBRID VEHICLE CONTROL ECU)

(a) Disconnect the No. 2 battery pack wire connector.





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





Standard resistance:





NG -- CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - NO. 2 BATTERY PACK WIRE CONNECTOR)
OK -- Continue to next step.

7. CHECK FRAME WIRE (NO. 2 FUSIBLE LINK BLOCK ASSEMBLY SIDE)

CAUTION:
Be sure to wear insulated gloves.

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

(b) Check the connection of the frame wire terminal (No. 2 fusible link block assembly side).





OK:

The terminal is connected securely and there is no contact problem.

(c) Check for arc marks on the frame wire terminals (No. 2 fusible link block assembly side and vehicle wire harness side).

Result:





C -- CONNECT SECURELY

B -- REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA
A -- Continue to next step.

8. CHECK HYBRID VEHICLE CONVERTER (AMD TERMINAL CONNECTION CONDITION)

CAUTION:
Be sure to wear insulated gloves.

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

(b) Check the connection of the AMD terminal (hybrid vehicle converter side).





OK:

The terminal is connected securely and there is no contact problem.

(c) Check for arc marks on the AMD terminals (hybrid vehicle converter side and vehicle wire harness side).

Result:





C -- CONNECT SECURELY

B -- REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA
A -- Continue to next step.

9. CHECK HYBRID VEHICLE CONVERTER (INSTALLATION CONDITION)

CAUTION:
Be sure to wear insulated gloves.

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

(b) Check that the HV battery assembly installation bolts are tightened to the specified torque. Check that the HV battery assembly installation bolts are connected securely and that there are no contact problems.





Torque:

Bolts
20 N*m (204 kgf*cm, 15 ft.*lbf)

(c) Check that the hybrid vehicle converter installation nuts are tightened to the specified torque. Check that the hybrid vehicle converter installation nuts are connected securely and that there are no contact problems.





Torque:

Nuts
7.5 N*m (77 kgf*cm, 66 in.*lbf)

(d) Check for arc marks at each nut and bolt.

Result:





HINT
Because the hybrid vehicle converter is grounded to the body, DTC P0A08-264 may be set if there are any contact or connection problems.

C -- CONNECT SECURELY

B -- REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA
A -- Continue to next step.

10. CHECK CONNECTOR CONNECTION CONDITION (HV BATTERY JUNCTION BLOCK CONNECTOR)

CAUTION:
Be sure to wear insulated gloves.

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

(b) Check the connections of the high-voltage connectors for the hybrid vehicle converter that are connected to the HV battery junction block.





HINT
For the removal and installation procedures related to inspection of the connections of the high-voltage connectors for the hybrid vehicle converter, Components.

OK:

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

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

11. CHECK HV BATTERY JUNCTION BLOCK (ELECTRIC BATTERY FUSE)

CAUTION:
Be sure to wear insulated gloves.

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

(b) Check if there is an open circuit in the electric battery fuse that is installed in the HV battery junction block.





OK:

There is no open circuit in the fuse.

(c) Check that the bolts for the electric battery fuse are tightened to the specified torque.

Specified Condition:

T=4.5 N*m {46 kgf*cm, 40 in.*lbf}

NOTICE:
Be sure to use a torque wrench to check the tightening torque.

NG -- REPLACE ELECTRIC BATTERY FUSE
OK -- Continue to next step.

12. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONVERTER 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 low voltage connector of the hybrid vehicle converter.

OK:

The connector is connected securely and there are no contact problems.

HINT
For the removal and installation procedures related to inspection of the connection of the low voltage connector of the hybrid vehicle converter, Components.

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

13. CHECK HARNESS AND CONNECTOR (NO. 2 BATTERY PACK WIRE CONNECTOR - HYBRID VEHICLE CONVERTER)

CAUTION:
Be sure to wear insulated gloves.

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





(b) Disconnect the low voltage connector from the hybrid vehicle converter.

HINT
For the removal and installation procedures related to the low voltage connector of the hybrid vehicle converter, Components.

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

Standard resistance:





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

14. INSPECT HYBRID VEHICLE CONVERTER

(a) Connect all the disconnected connectors.





(b) Install the service plug grip.

(c) Measure the current output from the hybrid vehicle converter with the headlight position switch and blower motor switch in the HI position, and the rear window defogger turned on (*1).

(d) Measure the auxiliary battery voltage according to the previous conditions (*1).

Result:





NG -- REPLACE HYBRID VEHICLE CONVERTER Components
OK -- Continue to next step.

15. CHECK FOR INTERMITTENT PROBLEMS

(a) Check for intermittent problems Check For Intermittent Problems.

NG -- REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA

OK -- REPLACE HYBRID VEHICLE CONVERTER Components

16. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - NO. 2 BATTERY PACK WIRE CONNECTOR)

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

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

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





HINT
Turning the power switch on (IG) with the service plug grip removed causes an interlock switch system DTC (P0A0D-350) to be set.

Standard voltage:





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

(d) Turn the power switch off.

(e) 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 -- REPLACE HYBRID VEHICLE CONTROL ECU Components