Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Drive Motor "B" Position Sensor Circuit Voltage Below Threshold (P0A4516,P0A451F)

Toyota Corolla Cross (2022-2024) Service Manual / Engine & Hybrid System / Hybrid / Battery Control / Motor Generator Control System / Drive Motor "B" Position Sensor Circuit Voltage Below Threshold (P0A4516,P0A451F)

DTC SUMMARY

MALFUNCTION DESCRIPTION

These DTCs indicate that the resolver output signal is abnormal. The cause of this malfunction may be one of the following:

Area

Main Malfunction Description

Inverter low-voltage circuit

The connectors are not connected properly

Rear traction motor with transaxle assembly

  • Short circuit in the rear motor resolver circuit
  • Rear motor (MGR) internal malfunction (entry of foreign matter, etc.)

Wire harness between the resolver and inverter with converter assembly

  • Short circuit in the wire harness
  • The connectors are not connected properly (entry of foreign matter or water, etc.)

Inside of inverter

Inverter with converter assembly internal circuit malfunction

DESCRIPTION

Refer to the system description for the Rear Motor Resolver Circuit.

Click here

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

Note

P0A4516

Drive Motor "B" Position Sensor Circuit Voltage Below Threshold

Interphase short in the rear motor resolver circuit:

A short circuit between signal lines of rear motor resolver phases is electrically detected.

(1 trip detection logic)

  • Inverter with converter assembly
  • Rear traction motor with transaxle assembly
  • Wire harness or connector

Comes on

Master Warning:

Comes on

SAE Code:

P0A45

P0A451F

Drive Motor "B" Position Sensor Circuit Intermittent

A short circuit between signal lines of rear motor resolver phases is electrically detected when DTC P0C7917, P0E5717, P0D3319, P1C5D19, P1C5F19 or P1C5E19 is stored.

(1 trip detection logic)

  • Inverter with converter assembly
  • Rear traction motor with transaxle assembly
  • Wire harness or connector

Does not come on

Master Warning:

Does not come on

SAE Code:

P0A49

MONITOR DESCRIPTION

The motor generator control ECU monitors the rear motor resolver output signal. If the motor generator control ECU detects output signals that are out of the normal range or specification, it will conclude that there is a malfunction in the rear motor resolver, illuminate the MIL and store a DTC.

MONITOR STRATEGY

Related DTCs

P0A45 (INF P0A4516): Short circuit between phases

Required sensors/components

Rear motor 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

Motor generator control ECU

DTC P0A45 (INF P0A4516) is not detected

CONFIRMATION DRIVING PATTERN

HINT:

  • After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

    Click here

  • When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

    Click here

  1. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  2. Turn the ignition switch off and wait for 2 minutes or more.
  3. Turn the ignition switch to ON and wait for 5 seconds or more. [*1]
  4. Turn the ignition switch to ON (READY) with the shift lever in P and wait for 5 seconds or more. [*2]
  5. Depress the accelerator pedal of the vehicle with the engine stopped and shift lever in P to start the engine. [*3]
  6. Drive the vehicle forward with the shift lever in D for 5 m (16 ft.) or more. [*4]
  7. Drive the vehicle backward with the shift lever in R for 5 m (16 ft.) or more. [*5]

    HINT:

    [*1] to [*5]: Normal judgment procedure.

    The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

  8. Enter the following menus: Powertrain / Motor Generator / Utility / All Readiness.
  9. Check the DTC judgment result.

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE, perform the normal judgment procedure again.

WIRING DIAGRAM

Refer to the wiring diagram for the Rear Motor Resolver Circuit.

Click here

CAUTION / NOTICE / HINT

CAUTION:

Refer to the precautions before inspecting high voltage circuit.

Click here

NOTICE:

  • After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.

    Click here

  • When disconnecting and reconnecting the auxiliary battery.

    HINT:

    When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.

    Click here

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.
  • When inspecting the connectors, if it is difficult to judge if a connector was disconnected, deformed or improperly secured, disconnect and reconnect the connector and then check for DTCs again. Check if the same DTC is output. If the same DTC is not output, improper connection of connectors is suspected.
  • As a malfunction detection threshold may be exceeded when performing the vibration or heat connector inspections, make sure to perform the following inspection to check that the DTC was not stored due to the malfunction of a part.
  • P0A4516 or P0A451F may be output as a result of the malfunctions indicated by the DTCs in table below.
    1. The chart above is listed in inspection order of priority.
    2. 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.)
Table 1

Malfunction Content

System

Relevant DTC

Insulation malfunction

Hybrid control system

P1C7C49

Hybrid/EV Battery Voltage System Isolation (A/C Area) Internal Electronic Failure

P1C7D49

Hybrid/EV Battery Voltage System Isolation (Hybrid/EV Battery Area) Internal Electronic Failure

P1C7E49

Hybrid/EV Battery Voltage System Isolation (Transaxle Area) Internal Electronic Failure

P1C7F49

Hybrid/EV Battery Voltage System Isolation (Direct Current Area) Internal Electronic Failure

P1C8049

Hybrid/EV Battery Voltage System Isolation (Rear Motor Area) Internal Electronic Failure

Table 2

Malfunction Content

System

Relevant DTC

Microcomputer malfunction

Motor generator control system

P0A1B47

Drive Motor "A" Control Module Watchdog / Safety MC Failure

P0A1C47

Drive Motor "B" Control Module Watchdog / Safety MCU Failure

P0A1C49

Drive Motor "B" Control Module Internal Electronic Failure

P1C2B1C

Drive Motor "A" Control Module A/D Converter Circuit Voltage Out of Range

P1C2B49

Drive Motor "A" Control Module A/D Converter Circuit Internal Electronic Failure

P1C2B71

Drive Motor "A" Control Module A/D Converter Circuit Actuator Stuck

P1C2C1C

Drive Motor "B" Control Module AD Converter Circuit Voltage Out of Range

P1C2C49

Drive Motor "B" Control Module AD Converter Internal Electronic Failure

P1C2C71

Drive Motor "B" Control Module A/D Converter Circuit Actuator Stuck

P310B83

Communication Error from Drive Motor "A" to Drive Motor "B" Value of Signal Protection Calculation Incorrect

P310B86

Communication Error from Drive Motor "A" to Drive Motor "B" Signal (Some Circuit Quantity, Reported via Serial Data) Invalid

P310B87

Communication Error from Drive Motor "A" to Drive Motor "B" Missing Message

Hybrid control system

P0A1B49

Drive Motor "A" Control Module Internal Electronic Failure

Power source circuit malfunction

Motor generator control system

P06B31C

Drive Motor "B" Control Module Position Sensor REF Power Source Circuit Voltage Out of Range

P19F91C

Drive Motor "B" Control Module Offset Power Circuit Voltage Out of Range

PROCEDURE

1.

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

A

2.

CHECK REAR MOTOR RESOLVER CIRCUIT

Click here

HINT:

If the "Rear Motor Resolver Circuit" inspection results are normal, perform the next step.

NEXT

REPLACE INVERTER WITH CONVERTER ASSEMBLY

    READ NEXT:

     Drive Motor "B" Position Sensor Signal Amplitude < (P0A4521,P0A1C47,P0A4522,P1C2C49)

    DTC SUMMARY MALFUNCTION DESCRIPTION These DTCs indicate that the resolver output signal is abnormal. The cause of this malfunction may be one of the following: Area Main Malfunction Descripti

     Generator Position Sensor Circuit Voltage Below Threshold (P0A4B16,P0A4B1F)

    DTC SUMMARY MALFUNCTION DESCRIPTION These DTCs indicate that the resolver output signal is abnormal. The cause of this malfunction may be one of the following: Area Main Malfunction Descripti

     Generator Position Sensor Signal Amplitude < (P0A4B21,P0A1A47,P0A4B22,P1C2A49)

    DTC SUMMARY MALFUNCTION DESCRIPTION These DTCs indicate that the resolver output signal is abnormal. The cause of this malfunction may be one of the following: Area Main Malfunction Descripti

    SEE MORE:

     Drive Motor A" Phase U Current Sensor Signal Bias Level Out of Range / Zero Adjustment Failure" (P0BE528,P0BE928,P0BED28)

    DTC SUMMARY MALFUNCTION DESCRIPTION These DTCs indicate that the current sensor value is abnormal. The cause of this malfunction may be one of the following: Internal inverter malfunction Current sensor malfunction Inverter with converter assembly internal circuit malfunction DESCRI

     Installation

    INSTALLATION CAUTION / NOTICE / HINT COMPONENTS (INSTALLATION) Procedure Part Name Code 1 REAR DIFFERENTIAL SUPPORT 52391B - - - 2 REAR NO. 2 DIFFE

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