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Home >> Lexus >> 2011 >> CT 200h L4-1.8L (2ZR-FXE) Hybrid >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P0A94 >> P0A94-587 - DC / DC Converter Performance

P0A94-587 - DC / DC Converter Performance





HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM: P0A94-587: DC / DC Converter Performance
P0A94-587 - DC / DC Converter Performance

DESCRIPTION

For a description of the boost converter P0A94.

The MG ECU uses a voltage sensor (VL) that is built into the boost converter to detect the high voltage before it is boosted. The ECU also uses the battery smart unit to detect HV battery voltage (VB).

HINT
Using the Techstream, check the Data List of HV battery voltage and current. If these values are not within the below range, there is a battery smart unit malfunction.









MONITOR DESCRIPTION

The power management control ECU (HV CPU) monitors signals of HV battery voltage (VB) and boost converter voltage (VL) sensors. When a large difference occurs between the voltages from the VB and VL sensors, the power management control ECU (HV CPU) interprets this as a failure of either of the sensors. The power management control ECU (HV CPU) will illuminate the MIL and set a DTC.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





COMPONENT OPERATING RANGE





CONFIRMATION DRIVING PATTERN

1. Connect the Techstream to the DLC3.

2. Turn the power switch on (IG) and turn the Techstream on.

3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

4. Turn the power switch off.

5. Turn the power switch on (READY) and turn the Techstream on.

6. With the shift lever in D, depress both the accelerator pedal and brake pedal at the same time to raise the SOC to a sufficient level.

7. Push the P position switch, check that the engine is stopped and move the shift lever to N.

8. Set the A/C for maximum cooling.

9. Leave the vehicle for a few minutes.

10. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

11. Check that permanent DTCs are cleared.

12. If the permanent DTCs are not cleared, perform the universal trip, and then check for permanent DTCs again.

HINT
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.

INSPECTION PROCEDURE

PROCEDURE

1. CHECK DTC OUTPUT (HYBRID CONTROL)

(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:





(e) Turn the power switch off.

D -- GO TO DTC CHART (P0A94-585) P0A94

C -- REPLACE INVERTER WITH CONVERTER ASSEMBLY Components

B -- GO TO DTC CHART (P0AFC-129) P0AFC
A -- Continue to next step.

2. CLEAR DTC

(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) Read and record the DTCs and freeze frame data.

(e) Clear DTCs and freeze frame data.

(f) Turn the power switch off.

NEXT -- Continue to next step.

3. CHECK DTC OUTPUT (HYBRID CONTROL)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (READY). (*1)

(c) Enter the following menus: Powertrain / Hybrid Control / Data List (*2)

(d) If both HV battery voltage (VB) and VL-Voltage before Boosting are less than 220 V, move the shift lever to D and depress both the accelerator pedal and brake pedal at the same time to raise them to 220 V or more. (*3)

(e) Push the P position switch. (*4)

(f) Set the air conditioning to MAX COOL and turn the headlights on. (*5)

(g) Confirm that "Batt Pack Current Val" is more than 3 A. (*6)

(h) Leave the vehicle for 15 seconds with the engine stopped during steps (*4) (*5) and (*6). (*7)

(i) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes. (*8)

(j) Check if DTCs are output. (*9)

NOTICE:
If the low battery charge warning light comes on, push the P position switch and start the engine to charge the HV battery. After the engine stops, perform steps (*1) through (*9) again.

Result:





(k) Turn the power switch off.

E -- REPLACE BATTERY SMART UNIT Components

D -- LEAVE VEHICLE WITH PARK (P) SELECTED, AND CHARGE HV BATTERY BY IDLING UNTIL IDLING STOPS (PERFORM STEPS (*1) THROUGH (*9))

C -- REPLACE INVERTER WITH CONVERTER ASSEMBLY Components

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

4. CHECK DTC OUTPUT (HYBRID CONTROL)

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

(b) Perform a road test that repeats full acceleration to 37 mph (60 km/h) and then braking to a complete stop three times. (*10)

(c) Connect the Techstream to the DLC3.

(d) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes. (*11)

(e) Check if DTCs are output. (*12)

Result:





(f) Turn the power switch off.

E -- REPLACE BATTERY SMART UNIT Components

D -- LEAVE VEHICLE WITH PARK (P) SELECTED, AND CHARGE HV BATTERY BY IDLING UNTIL IDLING STOPS (PERFORM STEPS (*10) THROUGH (*12))

C -- REPLACE INVERTER WITH CONVERTER ASSEMBLY Components

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

5. READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

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

(c) Enter the following menus: Powertrain / Hybrid Control / Data List.

(d) Select HV battery voltage (VB), VL-Voltage before Boosting and VH-Voltage after Boosting in the Data List.

(e) If both HV battery voltage (VB) and VL-Voltage before Boosting are less than 220 V, move the shift lever to D and depress both the accelerator pedal and brake pedal at the same time to raise them to 220 V or more.

(f) Turn the engine off, push the P position switch, and read the Data List when the vehicle is stationary.

Result:





(g) Turn the power switch off.

C -- REPLACE BATTERY SMART UNIT Components

B -- REPLACE INVERTER WITH CONVERTER ASSEMBLY Components
A -- Continue to next step.

6. CHECK FREEZE FRAME DATA (HYBRID CONTROL)

(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) Read the freeze frame data of DTC P0A94-587.

Result:





(e) Turn the power switch off.

C -- REPLACE INVERTER WITH CONVERTER ASSEMBLY Components

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

7. CHECK FREEZE FRAME DATA (HYBRID CONTROL)

(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) Read the freeze frame data of DTC P0A94-587.

HINT
In the freeze frame data, read the HV battery voltage value and all of the battery block voltage values.

Result:





(e) Turn the power switch off.

C -- REPLACE BATTERY SMART UNIT Components

B -- REPLACE INVERTER WITH CONVERTER ASSEMBLY Components
A -- Continue to next step.

8. READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

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

(c) Enter the following menus: Powertrain / Hybrid Control / Data List.

(d) If both HV battery voltage (VB) and VL-Voltage before Boosting are less than 220 V, move the shift lever to D and depress both the accelerator pedal and brake pedal at the same time to raise them to 220 V or more.

(e) Turn the engine off, push the P position switch, and read the Data List of all battery block and HV battery voltages, when the vehicle is stationary.

Result:





(f) Turn the power switch off.

B -- REPLACE BATTERY SMART UNIT Components

A -- REPLACE INVERTER WITH CONVERTER ASSEMBLY Components
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