- Open or short circuit in the motor, generator or rear motor coils
- An internal motor, generator or rear motor malfunction (iron particles or damage from foreign objects)
Lexus NX: DC / DC Converter Performance (P0A94-127)
Lexus NX Service Manual / Engine & Hybrid System / 2ar-fxe (hybrid / Battery Control) / Hybrid Control System / DC / DC Converter Performance (P0A94-127)
DTC SUMMARY
MALFUNCTION DESCRIPTION
This DTC indicates that an overvoltage in the inverter has occurred. The cause of this malfunction may be one of the following:
| Area | Main Malfunction Description | Step |
|---|---|---|
| Inverter low-voltage circuit | The connectors are not connected properly | 2 |
| Resolver | Open or short circuit in the motor resolver, generator resolver or rear motor resolver circuit | 3, 4, 5 |
| Motor, generator or rear motor | | 6, 7, 8 |
| HV battery high-voltage line circuit |
| 9 |
| Inverter |
| 10 |
DESCRIPTION
For a description of the boost converter.
Click here .gif)
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 |
|---|---|---|---|---|---|
| P0A94-127 | DC / DC Converter Performance | Boost converter overvoltage signal detected (overvoltage due to system malfunction)*: Overvoltage is detected before boosting. A malfunction is detected in any of the boost converter components (inverter, hybrid vehicle transaxle assembly, MG ECU, etc.). (1 trip detection logic) |
| Comes on | Master Warning Light: Comes on |
*: This DTC is output when an overvoltage in the pre-boost is detected and there is no history information indicating the specific part.
Check related parts (inverter, motor, generator, rear motor, resolver, HV battery high voltage line circuit, cable, wire harness, hybrid vehicle control ECU).
MONITOR DESCRIPTION
If the boost converter detects over-voltage, it transmits an over-voltage 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 illuminates the MIL and store a DTC.
MONITOR STRATEGY
| Related DTCs | P0A94 (INF 127): OVL detection (overvoltage 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 127) 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.
WIRING DIAGRAM
Refer to the wiring diagram for DTC P1CAC-200.
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Refer to the wiring diagram for DTC P0AA6-526.
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Refer to the wiring diagram for DTC P324E-788.
Click here
Refer to the wiring diagram for the inverter low-voltage circuit.
Click here
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.
-
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.
Click here
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.
Click here
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 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 for DTCs.
Powertrain > Hybrid Control > Trouble Codes| Result | Proceed to |
|---|---|
| P0A94-127 only is output, or DTCs except the ones in the table below are also output. | A |
| Any of the following DTCs including pending DTCs are also output. | B |
| Malfunction Content | Relevant DTC | |
|---|---|---|
| Microcomputer malfunction | P0A1A-151, 166, 658, 791 | Generator Control Module |
| P0A1B-198, 786, 794 | Drive Motor "A" Control Module | |
| P0A1C-709, 710, 713, 797 | Drive Motor "B" Control Module | |
| P0A1D (all INF codes)* | Hybrid Powertrain Control Module | |
| P1C2A-155 | Generator A/D Converter Circuit | |
| P1C2B-192 | Drive Motor "A" A/D Converter Circuit | |
| P1C2C-706 | Drive Motor "B" A/D Converter Circuit | |
| P1CA6-156 | Generator Control Module Malfunction | |
| P1CA7-193 | Drive Motor Control Module Malfunction | |
| P1CA8-708 | Drive Motor "B" Control Module Malfunction | |
| P1CAC-200 | Generator Position Sensor Angle Malfunction | |
| P1CAD-168 | Drive Motor "A" Position Sensor Angle Malfunction | |
| P1CAE-715 | Drive Motor "B" Position Sensor Angle Malfunction | |
| P1CAF-792 | Generator Position Sensor REF Signal Cycle Malfunction | |
| P1CB0-795 | Drive Motor "A" Position Sensor REF Signal Cycle Malfunction | |
| P1CB1-798 | Drive Motor "B" Position Sensor REF Signal Cycle Malfunction | |
| P1CB2-793 | Generator Position Sensor REF Signal Stop Malfunction | |
| P1CB3-796 | Drive Motor "A" Position Sensor REF Signal Stop Malfunction | |
| P1CB4-799 | Drive Motor "B" Position Sensor REF Signal Stop Malfunction | |
| P3133-659 | Communication Error from Generator to Drive Motor "A" | |
| P3134-661 | Communication Error from Drive Motor "A" to Generator | |
| Power source circuit malfunction | P06B0-163 | Sensor Power Supply "A" Circuit / Open |
| P06D6-511 | Sensor Reference Voltage "F" Circuit / Open | |
| P06E6-164 | Sensor Power Supply "C" Circuit / Open | |
| P1C73-512 | Sensor Standard Voltage "F" Circuit / Open | |
| Sensor and actuator circuit malfunction | P0A3F-243 | Drive Motor "A" Position Sensor Circuit |
| P0A40-500 | Drive Motor "A" Position Sensor Circuit Range / Performance | |
| P0A41-245 | Drive Motor "A" Position Sensor Circuit Low | |
| P0A45-669 | Drive Motor "B" Position Sensor Circuit | |
| P0A46-671 | Drive Motor "B" Position Sensor Circuit Range / Performance | |
| P0A47-670 | Drive Motor "B" Position Sensor Circuit Low | |
| P0A4B-253 | Generator Position Sensor Circuit | |
| P0A4C-513 | Generator Position Sensor Circuit Range / Performance | |
| P0A4D-255 | Generator Position Sensor Circuit Low | |
| P0BEA-290 | Drive Motor "A" Phase V Current Sensor Circuit Range / Performance | |
| P0BEE-298 | Drive Motor "A" Phase W Current Sensor Circuit Range / Performance | |
| P0BF6-683 | Drive Motor "B" Phase V Current Sensor Circuit Range / Performance | |
| P0BFA-685 | Drive Motor "B" Phase W Current Sensor Circuit Range / Performance | |
| P0E05-328 | Generator Phase V Current Sensor Circuit Range / Performance | |
| P0E09-336 | Generator Phase W Current Sensor Circuit Range / Performance | |
| P1C3C-294 | Drive Motor "A" Phase V Current Sensor Correlation | |
| P1C3D-302 | Drive Motor "A" Phase W Current Sensor Correlation | |
| P1C3E-333 | Generator Phase V Current Sensor Correlation | |
| P1C3F-341 | Generator Phase W Current Sensor Correlation | |
| P1C4A-288 | Drive Motor "A" Phase V Current Sensor Sub Circuit Range / Performance | |
| P1C4F-296 | Drive Motor "A" Phase W Current Sensor Sub Circuit Range / Performance | |
| P1C54-326 | Generator Phase V Current Sensor Sub Circuit Range / Performance | |
| P1C59-334 | Generator Phase W Current Sensor Sub Circuit Range / Performance | |
| P1C6D-501 | Drive Motor "A" Phase V Current Sensor Offset Range / Performance | |
| P1C6E-502 | Drive Motor "A" Phase W Current Sensor Offset Range / Performance | |
| P1C6F-688 | Drive Motor "B" Phase V Current Sensor Offset Range / Performance | |
| P1C70-689 | Drive Motor "B" Phase W Current Sensor Offset Range / Performance | |
| P1C71-515 | Generator Phase V Current Sensor Offset Range / Performance | |
| P1C72-516 | Generator Phase W Current Sensor Offset Range / Performance | |
| P33C1-684 | Drive Motor "B" Phase V Current Sensor Sub Circuit Range / Performance | |
| P33C6-686 | Drive Motor "B" Phase W Current Sensor Sub Circuit Range / Performance | |
| P33D8-677 | Drive Motor "B" Phase V Current Sensor Correlation | |
| P33D9-678 | Drive Motor "A" Phase W Current Sensor Correlation | |
| System malfunction | P0A1A-517, 809 | Generator Control Module |
| P0A1B-503, 505, 547, 554, 806 | Drive Motor "A" Control Module | |
| P0A1C-693, 812 | Drive Motor "B" Control Module | |
| P0A40-504, 506, 549, 556, 808 | Drive Motor "A" Position Sensor Circuit Range / Performance | |
| P0A46-695, 814 | Drive Motor "B" Position Sensor Circuit Range / Performance | |
| P0A4C-518, 811 | Generator Position Sensor Circuit Range / Performance | |
| P0A78-113, 128, 279, 284, 286, 287, 548, 555, 807 | Drive Motor "A" Inverter Performance | |
| P0A79-136, 692, 694, 696, 712, 813 | Drive Motor "B" Inverter Performance | |
| P0A7A-122, 130, 322, 324, 325, 810 | Generator Inverter Performance | |
| P0A90-509 | Drive Motor "A" Performance | |
| P0A91-702 | Drive Motor "B" Performance | |
| P0A92-521 | Hybrid Generator Performance | |
| P0A94-172, 553, 557 | DC / DC Converter Performance | |
| P0AA6-526 | Hybrid Battery Voltage System Isolation Fault | |
| P0ADB-227 | Hybrid Battery Positive Contactor Control Circuit Low | |
| P0ADC-226 | Hybrid Battery Positive Contactor Control Circuit High | |
| P0ADF-229 | Hybrid Battery Negative Contactor Control Circuit Low | |
| P0AE0-228 | Hybrid Battery Negative Contactor Control Circuit High | |
| P0C19-306 | Drive Motor "A" Torque Delivered Performance | |
| P0C1A-704 | Drive Motor "B" Torque Delivered Performance | |
| P0C76-523 | Hybrid Battery System Discharge Time Too Long | |
| P0CA3-442 | DC/DC Converter Step Up Voltage Performance | |
| P0D2E-586 | Drive Motor "A" Inverter Voltage Sensor Circuit Range / Performance | |
| P0D2F-266 | Drive Motor "A" Inverter Voltage Sensor Circuit Low | |
| P0D30-267 | Drive Motor "A" Inverter Voltage Sensor Circuit High | |
| P0E32-564, 585 | DC/DC Converter Voltage Sensor "A" Range / Performance | |
| P0E33-589 | DC/DC Converter Voltage Sensor "A" Low | |
| P0E34-590 | DC/DC Converter Voltage Sensor "A" High | |
| P0E71-344 | Generator Torque Delivered Performance | |
| P1C2D-587 | Hybrid Battery Voltage / DC/DC Converter Voltage Correlation | |
| P3004-803 | High Voltage Power Resource | |
HINT:
- *1: If any INF codes are output for this DTC, refer to the corresponding diagnostic procedure.
-
P0A94-127 may be output as a result of the malfunction indicated by the DTCs above.
- The chart above is listed in inspection order of priority.
- Check DTCs that are output at the same time by following the listed order. (The main cause of the malfunction can be determined without performing unnecessary inspections.)
(e) Turn the power switch off.
| B | .gif) | GO TO DTC CHART (HYBRID CONTROL SYSTEM) |
|
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| 2. | CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR) |
Click here
| 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 |
| B | | CONNECT SECURELY |
| C | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 3. | CHECK GENERATOR RESOLVER CIRCUIT |
Click here
|
| 4. | CHECK MOTOR RESOLVER CIRCUIT |
Click here
|
| 5. | CHECK REAR MOTOR RESOLVER CIRCUIT |
Click here
|
| 6. | CHECK GENERATOR HIGH-VOLTAGE CIRCUIT |
Click here
|
| 7. | CHECK MOTOR HIGH-VOLTAGE CIRCUIT |
Click here
|
| 8. | CHECK REAR MOTOR HIGH-VOLTAGE CIRCUIT |
Click here
|
| 9. | CHECK HV BATTERY HIGH-VOLTAGE LINE CIRCUIT |
Click here
|
| 10. | CHECK INVERTER LOW-VOLTAGE CIRCUIT |
Click here
HINT:
If the "Inverter Low-voltage Circuit" inspection results are normal, perform the next step.
| NEXT | | REPLACE INVERTER WITH CONVERTER ASSEMBLY |
READ NEXT:
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Int
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DESCRIPTION The hybrid vehicle control ECU estimates the thermal load of the high voltage fuse. If the accumulated thermal load exceeds the threshold, the hybrid vehicle control ECU will store this DT
SEE MORE:
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT:
Use these procedures to troubleshoot the LIN communication system.
*: Use the Techstream.
PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP
NEXT 2. INSPECT AUXILIARY BATTERY VOLTAGE (a) Measure the auxiliary battery voltage with the pow
Freeze Frame Data
FREEZE FRAME DATA FREEZE FRAME DATA (a) Whenever a DTC is detected, the blind spot monitor sensor stores the current vehicle (sensor) state as Freeze Frame Data. CHECK FREEZE FRAME DATA (a) Connect the Techstream to the DLC3. (b) Turn the power switch on (IG). (c) Turn the blind spot monitor main sw
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