P0A94-587
L110 HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: P0A94-587: DC / DC Converter Performance
DTC P0A94-587 - DC / DC Converter Performance
DESCRIPTION
For a description of the boost converter, P0A94-442.
The MG ECU uses a voltage sensor that is built into the boost converter to detect the high voltage (VL) before it is boosted. The ECU also uses a battery smart unit to detect HV battery voltage (VB).
MONITOR DESCRIPTION
The MG ECU monitors the 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 MG ECU interprets this as a failure of either of the sensors. The hybrid vehicle control ECU will illuminate the MIL and set a DTC.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
COMPONENT OPERATING RANGE
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, check the voltage at 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:
C -- REPLACE BATTERY SMART UNIT
B -- REPLACE INVERTER WITH CONVERTER ASSEMBLY
A -- GO TO INSPECTION PROCEDURE RELEVANT TO OUTPUT DTC (P0A1F-129)
D -- Continue to next step.
2. CLEAR DTC
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Read and record the DTCs and freeze frame data.
(d) Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
(e) Clear the DTCs.
NEXT -- Continue to next step.
3. CHECK DTC OUTPUT (HV)
(a) Turn the power switch on (READY) and move the shift lever to the N position. (*1)
(b) Turn the A/C switch to the MAX COOL position. (*2)
(c) Select the following menu items: Powertrain / Hybrid Control / Data List / Power Resource IB.
(d) Confirm that "Power Resource IB" is more than 3 A. (*3)
(e) Leave the vehicle in the condition specified in steps (*2) and (*3) above for 15 seconds. (*4)
NOTE: If the low battery charge warning light comes on, move the shift lever to the P position and start the engine to charge the HV battery. After the engine stops, perform steps (*1) through (*5) again.
(f) Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
(g) Check if DTCs are output. (*5)
Result:
D -- REPLACE BATTERY SMART UNIT
C -- LEAVE VEHICLE IN P POSITION, AND CHARGE HV BATTERY IN IDLE STATUS UNTIL IDLING STOPS (PERFORM STEPS (*1) THROUGH (*5))
B -- REPLACE INVERTER WITH CONVERTER ASSEMBLY
A -- REPLACE BATTERY SMART UNIT
E -- Continue to next step.
4. CHECK DTC OUTPUT (HV)
(a) Connect the Techstream to the DLC3. (*6)
(b) Perform a road test that repeats full acceleration to 60 km/h and then full braking to a complete stop several times. (*7)
(c) Select the following menu items: Powertrain / Hybrid Control / Trouble Codes. (*8)
(d) Check if DTCs are output. (*9)
Result:
D -- REPLACE BATTERY SMART UNIT
C -- LEAVE VEHICLE IN P POSITION, AND CHARGE HV BATTERY IN IDLE STATUS UNTIL IDLING STOPS (PERFORM STEPS (*6) THROUGH (*9))
B -- REPLACE INVERTER WITH CONVERTER ASSEMBLY
A -- REPLACE BATTERY SMART UNIT
E -- Continue to next step.
5. READ VALUE USING TECHSTREAM
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (READY).
(c) Select the following menu items: Powertrain / Hybrid Control / Trouble Codes / Freeze Frame Date / Power Resource VB, VL-Voltage before Boosting and VH-Voltage after Boosting.
(d) Read the data list when the shift lever is in the N position (the engine is off) and the vehicle is stationary.
Result:
B -- REPLACE BATTERY SMART UNIT
A -- REPLACE INVERTER WITH CONVERTER ASSEMBLY
C -- Continue to next step.
6. CHECK FREEZE FRAME DATA
(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) Read output DTCs.
(e) Read the freeze frame data of P0A94-587.
Result:
B -- REPLACE INVERTER WITH CONVERTER ASSEMBLY
A -- REPLACE BATTERY SMART UNIT
C -- Continue to next step.
7. CHECK FREEZE FRAME DATA
(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) Read output DTCs.
(e) Read the freeze frame data of P0A94-587.
Result:
B -- REPLACE BATTERY SMART UNIT
A -- REPLACE INVERTER WITH CONVERTER ASSEMBLY
C -- Continue to next step.
8. READ VALUE USING TECHSTREAM
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (READY).
(c) Select the following menu items: Powertrain / Hybrid Control / Data List / Battery Block Vol-V01 to V20, Power Resource VB.
(d) Read the data list when the shift lever is in the N position (the engine is off) and the vehicle is stationary.
Result:
A -- REPLACE INVERTER WITH CONVERTER ASSEMBLY
B -- REPLACE BATTERY SMART UNIT