Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Generator Position Sensor Signal Amplitude < (P0A4B21,P0A1A47,P0A4B22,P1C2A49)

Toyota Corolla Cross (2022-2024) Service Manual / Engine & Hybrid System / Hybrid / Battery Control / Motor Generator Control System / 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 Description

Inverter low-voltage circuit

The connectors are not connected properly

Hybrid vehicle transaxle assembly

  • Open or short circuit in the generator resolver circuit
  • Generator (MG1) internal malfunction (entry of foreign matter, etc.)

Wire harness between the resolver and inverter with converter assembly

  • Open or short circuit in the wire harness
  • The connectors are not connected properly

Inside of inverter

Inverter with converter assembly internal circuit malfunction

DESCRIPTION

Refer to the system description for the Generator Resolver Circuit.

Click here

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

Note

P0A1A47

Generator Control Module Watchdog / Safety MC Failure

Generator resolver malfunction or motor generator control ECU internal malfunction

(1 trip detection logic)

  • Inverter with converter assembly
  • Hybrid vehicle transaxle assembly
  • Wire harness or connector

Comes on

Master Warning:

Comes on

SAE Code:

P0A1A

P0A4B21

Generator Position Sensor Signal Amplitude < Minimum

Open or short circuit in generator resolver circuit:

The generator resolver signal is out of the standard range.

(Signal amplitude is small)

(1 trip detection logic)

  • Inverter with converter assembly
  • Hybrid vehicle transaxle assembly
  • Wire harness or connector

Comes on

Master Warning:

Comes on

SAE Code:

P0A4D

P0A4B22

Generator Position Sensor Signal Amplitude > Maximum

Open or short circuit in generator resolver circuit:

The generator resolver signal is out of the standard range.

(Signal amplitude is large)

(1 trip detection logic)

  • Inverter with converter assembly
  • Hybrid vehicle transaxle assembly
  • Wire harness or connector

Comes on

Master Warning:

Comes on

SAE Code:

P0A4E

P1C2A49

Generator A/D Converter Circuit Internal Electronic Failure

Generator resolver malfunction or motor generator control ECU internal malfunction

(1 trip detection logic)

  • Inverter with converter assembly
  • Hybrid vehicle transaxle assembly
  • Wire harness or connector

Comes on

Master Warning:

Comes on

SAE Code:

P1C2A

MONITOR DESCRIPTION

The motor generator control ECU monitors the Generator 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 generator resolver, illuminate the MIL and store a DTC.

MONITOR STRATEGY

Related DTCs

P0A1A (INF P0A1A47): Generator Control Module

P0A4D (INF P0A4B21): Range check

P0A4E (INF P0A4B22): Range check

P1C2A (INF P1C2A49): Generator Control Module A/D Processing

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

Motor generator control ECU

DTC P0A1A (INF P0A1A47) is not detected

DTC P0A4D (INF P0A4B21) is not detected

DTC P0A4E (INF P0A4B22) is not detected

DTC P1C2A (INF P1C2A49) 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 the 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 Generator 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.
  • P0A1A47, P0A4B21, P0A4B22 or P1C2A49 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

P0A1A49

Generator Control Module Internal Electronic Failure

P1C2A1C

Generator A/D Converter Circuit Circuit Voltage Out of Range

P1C2A71

Generator A/D Converter Circuit Actuator Stuck

P1CAF38

Generator Position Sensor REF Signal Cycle Malfunction Signal Frequency Incorrect

P313483

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

P313486

Communication Error from Drive Motor "A" to Generator Signal Invalid

P313487

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

Power source circuit malfunction

Motor generator control system

P19F81C

Generator Control Module Offset Power Circuit Voltage Out of Range

P26DF1C

Generator Control Module Position Sensor REF Power Source 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 GENERATOR RESOLVER CIRCUIT

Click here

HINT:

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

NEXT

REPLACE INVERTER WITH CONVERTER ASSEMBLY

    READ NEXT:

     Drive Motor "A" Phase V Current(High Resolution) Circuit Short to Battery (P0A6012,...,P0A631F)

    DESCRIPTION The motor generator control ECU (MG ECU), which is built into the inverter with converter assembly, monitors its internal operation and will store DTCs if it detects a malfunction.

     Drive Motor "B" Phase V Current(High Resolution) Circuit Short to Battery (P0A6912,...,P0A6C1F)

    DESCRIPTION The motor generator control ECU (MG ECU), which is built into the inverter with converter assembly, monitors its internal operation and will store DTCs if it detects a malfunction.

     Drive Motor "A" Inverter Actuator Stuck Open (P0A7872)

    DTC SUMMARY MALFUNCTION DESCRIPTION This DTC is stored when the motor generator control system is malfunctioning and current does not flow as commanded. The cause of this malfunction may be one of the

    SEE MORE:

     Room Temperature Sensor Circuit Short to Battery or Open (B141A15)

    DESCRIPTION The cooler thermistor (room temperature sensor) is installed in the instrument panel to detect the cabin temperature, which is used to control the air conditioning system. The resistance of the cooler thermistor (room temperature sensor) changes in accordance with the cabin temperature.

     Data List / Active Test

    DATA LIST / ACTIVE TEST DATA LIST NOTICE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not. HINT: Using the GTS to read the Data List allows the values

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