Lexus NX: DC / DC Converter Performance (P0A94-550,P0E32-564)
DTC SUMMARY
MALFUNCTION DESCRIPTION
These DTCs indicate a malfunction inside the inverter for the motor. The cause of this malfunction may be one of the following:
- Internal circuit malfunction in the inverter for the motor
- Malfunction in the sensors for inverter control (current sensor, voltage sensors (VH, VL), etc.)
DESCRIPTION
For a description of the boost converter.
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If a malfunction occurs in the boost converter, the MG ECU detects it and transmits this information to the hybrid vehicle control ECU.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Warning Indicate |
|---|---|---|---|---|---|
| P0A94-550 | DC / DC Converter Performance | Boost converter overvoltage signal detected (circuit malfunction): Overvoltage or a circuit malfunction is detected before boosting. (1 trip detection logic) |
| Comes on | Master Warning Light: Comes on |
| P0E32-564 | DC/DC Converter Voltage Sensor "A" Range / Performance | Boost converter overvoltage signal detected (circuit malfunction (VL sensor)): VL sensor output (VL-Voltage before boosting) remains extremely high for a certain period of time. (1 trip detection logic) |
| Comes on | Master Warning Light: Comes on |
| DTC No. | Data List |
|---|---|
| P0A94-550 | - |
| P0E32-564 | VL-Voltage before Boosting |
MONITOR DESCRIPTION
If the boost converter detects a circuit malfunction, it will transmit a boost converter overvoltage signal to the MG ECU. Then the MG ECU will send information about the malfunction to the hybrid vehicle control ECU. Upon receiving this signal, the hybrid vehicle control ECU will illuminate the MIL and store a DTC.
MONITOR STRATEGY
| Related DTCs | P0A94 (INF 550): OVL detection (circuit malfunction) P0E32 (INF 564): OVL detection (DC/DC converter voltage sensor malfunction) |
| Required sensors/components | Boost converter |
| Frequency of operation | Continuous |
| Duration | TMC's intellectual property |
| MIL operation | 1 driving cycle |
| Sequence of operation | None |
TYPICAL ENABLING CONDITIONS
| The monitor will run whenever the following DTCs are not stored | TMC's intellectual property |
| Other conditions belong to TMC's intellectual property | - |
TYPICAL MALFUNCTION THRESHOLDS
| TMC's intellectual property | - |
COMPONENT OPERATING RANGE
| Hybrid vehicle control ECU | DTC P0A94 (INF 550) is not detected DTC P0E32 (INF 564) is not detected |
CONFIRMATION DRIVING PATTERN
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- Connect the Techstream to the DLC3.
- Turn the power switch on (IG) and turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the power switch off and wait for 30 seconds or more.
- Turn the power switch on (IG) and check that there are no abnormalities (abnormal sounds, coolant leaks, etc.).
- Turn the power switch on (READY) and turn the Techstream on.
- With the shift lever in P, wait for 5 seconds. [A]
- With the engine stopped and shift lever in P, depress the accelerator pedal to start the engine. [B]
- Enter the following menus: Powertrain / Hybrid Control / Trouble Codes. [C]
-
Read the current DTCs.
HINT:
- If a current DTC is output, the system is malfunctioning.
- If current DTCs are not output, perform the following steps to check for permanent DTCs.
- Check that the permanent DTCs are cleared.
- If the permanent DTCs are not cleared, perform a universal trip, and then check for permanent DTCs again.
CAUTION / NOTICE / HINT
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.
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After removing 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.
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HINT:
Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.
NOTICE:
After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.
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HINT:
After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.
- Turn the power switch on (READY) and wait for 5 seconds or more.
- With the engine stopped and the shift lever in P, depress the accelerator pedal to start the engine.
PROCEDURE
| 1. | CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR) |
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| Result | Proceed to |
|---|---|
| OK | A |
| NG (The connector is not connected securely.) | B |
| NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.) | C |
| A | .gif) | REPLACE INVERTER WITH CONVERTER ASSEMBLY |
| B | | CONNECT SECURELY |
| C | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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Problem Symptoms Table
PROBLEM SYMPTOMS TABLE HINT:
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Replacement
REPLACEMENT PROCEDURE 1. REMOVE NO. 1 ENGINE UNDER COVER Click here 2. DRAIN COOLANT (for Inverter Coolant) NOTICE: Collect the drained coolant and measure its volume to establish a benchmark. When adding coolant, make sure to add more coolant than the measured amount. (a) Remove the inverter re
