- Open or short circuit in the resolver for generator control
- Internal generator malfunction (entry of foreign matter, etc.)
Lexus NX: Generator Position Sensor Circuit (P0A4B-253-P0A4D-255)
Lexus NX Service Manual / Engine & Hybrid System / 2ar-fxe (hybrid / Battery Control) / Hybrid Control System / Generator Position Sensor Circuit (P0A4B-253-P0A4D-255)
DTC SUMMARY
MALFUNCTION DESCRIPTION
These DTCs indicate the resolver output signal is abnormal. 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 |
| Generator resolver | | 3 |
| Wire harness system between the resolver and inverter with converter assembly |
| 3 |
| Inside of inverter | Inverter with converter assembly internal circuit malfunction | 3 |
DESCRIPTION
Refer to the system description for the generator resolver circuit.
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| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Warning Indicate |
|---|---|---|---|---|---|
| P0A4B-253 | Generator Position Sensor Circuit | Interphase short in the generator resolver circuit: A short circuit between signal lines of generator resolver phases is electrically detected. (1 trip detection logic) |
| Comes on | Master Warning Light: Comes on |
| P0A4C-513 | Generator Position Sensor Circuit Range / Performance | Generator resolver signal is out of the normal range (amplitude is too large or too small). (1 trip detection logic) |
| Comes on | Master Warning Light: Comes on |
| P0A4D-255 | Generator Position Sensor Circuit Low | Open or short in the generator resolver circuit: Generator resolver signal is out of the normal range (amplitude is extremely small). (1 trip detection logic) |
| Comes on | Master Warning Light: Comes on |
MONITOR DESCRIPTION
The MG ECU monitors the generator resolver output signal. If the MG ECU detects output signals that are out of the normal range or specification, it will conclude that there is a malfunction in the generator resolver. If a malfunction is detected, the hybrid vehicle control ECU will illuminate the MIL and store a DTC.
MONITOR STRATEGY
| Related DTCs | P0A4B (INF 253): Short circuit between phases P0A4C (INF 513): Range check P0A4D (INF 255): Circuit discontinuity / short circuit |
| Required sensors/components | Generator resolver |
| 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 P0A4B (INF 253) is not detected DTC P0A4C (INF 513) is not detected DTC P0A4D (INF 255) 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 wait for 5 seconds or more.
- Turn the power switch on (READY) with the shift lever in P and wait for 5 seconds or more.
- Depress the accelerator pedal of the vehicle with the engine stopped and the shift lever in P to start the engine.
- Keep the engine running for 5 seconds or more.
- Drive the vehicle forward with the shift lever in D for 5 m (16 ft.) or more. [A]
- Drive the vehicle backward with the shift lever in R for 5 m (16 ft.) or more. [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, check for permanent DTCs.
- Check that the permanent DTCs are cleared.
- If the permanent DTCs are not cleared, perform the universal trip, and then check for permanent DTCs again.
WIRING DIAGRAM
Refer to the wiring diagram for the generator resolver circuit.
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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.
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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:
- If the problem symptom cannot be reproduced, performing a road test on a road on which the vehicle tends to vibrate will make it easier to reproduce the symptom.
- If the resolver is malfunctioning, the vehicle may not drive smoothly.
-
After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.
- Turn the power switch on (IG) and wait for 5 seconds or more.
- Turn the power switch on (READY) with the shift lever in P and wait for 5 seconds or more.
- Depress the accelerator pedal of the vehicle with the engine stopped and the shift lever in P to start the engine.
- Keep the engine running for 5 seconds or more.
- Drive the vehicle forward with the shift lever in D for 5 m (16 ft.) or more.
- Drive the vehicle backward with the shift lever in R for 5 m (16 ft.) or more.
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 |
|---|---|
| Only P0A4B-253, P0A4C-513 or P0A4D-255 is output, or DTCs other than P06B0-163, P06E6-164, P06D6-511 or P1C73-512 are output simultaneously | A |
| P06B0-163, P06E6-164, P06D6-511 or P1C73-512 is output simultaneously | B |
(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) |
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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 |
| B | | CONNECT SECURELY |
| C | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 3. | CHECK GENERATOR RESOLVER CIRCUIT |
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HINT:
If the "Generator Resolver Circuit" inspection results are normal, perform the next step.
| NEXT | | REPLACE INVERTER WITH CONVERTER ASSEMBLY |
READ NEXT:
Generator Position Sensor Circuit Range / Performance (P0A4C-518,P0A4C-811)
DTC SUMMARY MALFUNCTION DESCRIPTION These DTCs indicate that a large current flowed in the inverter for the generator. The cause of this malfunction may be one of the following: Area Main Malfunc
Drive Motor "B" Current Sensor Circuit (P0A55-687)
DESCRIPTION The MG ECU, which is built into the inverter with converter assembly, monitors its internal operation and will store DTCs if it detects a malfunction. HINT: The term "drive motor B" indica
Drive Motor "A" Inverter Performance (P0A78-113)
DTC SUMMARY MALFUNCTION DESCRIPTION This DTC indicates that a large current flowed through the inverter for the motor. The cause of this malfunction may be one of the following: Area Main Malfunc
SEE MORE:
Parts Location
PARTS LOCATION ILLUSTRATION *1 FORWARD RECOGNITION CAMERA *2 MILLIMETER WAVE RADAR SENSOR ASSEMBLY *3 BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - SKID CONTROL ECU *4 PARKING BRAKE ECU ASSEMBLY ILLUSTRATION *1 STEERING PAD SWITCH ASSEMBLY - VEHICLE-TO-VEHICLE DISTANCE C
CAN Communication Failure (Message Registry) (U1000)
DESCRIPTION If DTC U1000 is stored frequently, duplicate the conditions that cause the problem symptoms and perform the inspection again even if the DTC is not output when rechecking for DTCs. DTC No. Detection Item DTC Detection Condition Trouble Area U1000 CAN Communication Failure
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