Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Internal Control Module EEPROM Data Memory Failure (P062F44)

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Drivetrain / U881f (automatic Transmission / Transaxle) / Automatic Transaxle System / Internal Control Module EEPROM Data Memory Failure (P062F44)

DESCRIPTION

The ECM monitors its internal operation and will store this DTC when it detects an internal malfunction.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P062F44

Internal Control Module EEPROM Data Memory Failure

ECM internal malfunction (EEPROM)

ECM

Comes on

DTC stored

SAE Code:

P062F

MONITOR DESCRIPTION

The ECM monitors its internal operation. If the internal operation is malfunctioning, the ECM will illuminate the MIL and store this DTC.

MONITOR STRATEGY

Related DTCs

P062F: Internal control module EEPROM error

Required sensors/Components (Main)

ECM

Required sensors/Components (Related)

-

Frequency of operation

Once per driving cycle

Duration

-

MIL operation

Immediate

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

All

The monitor will run whenever the following DTCs are not stored.

None
Case 1

All of the following conditions are met

-

Permanent fault code

Not stored

OBDII system commands

Store

Battery voltage

8 V or higher
Case 2

All of the following conditions are met

-

Permanent fault code

Stored

OBDII system commands

Clear

Battery voltage

8 V or higher
Case 3

Battery voltage

8 V or higher

TYPICAL MALFUNCTION THRESHOLDS

Case 1

Following condition is met

2 data areas or more

Any of the following conditions (a), (b) or (c) are met

More than 3 times

(a) EEPROM access error

Occurred

(b) Permanent fault code

Not stored

(c) Permanent fault code

Not equal to commanded Fault Code
Case 2

Following condition is met

2 data areas or more

Either of the following conditions (a) or (b) is met

More than 3 times

(a) EEPROM access error

Occurred

(b) Permanent fault code

Stored
Case 3

Either of the following conditions is met

1 or 2

1. Following condition is met

2 data areas or more

(a) EEPROM access error occurred

More than 3 times

2. Permanent fault code data mismatch

More than 10 times

CONFIRMATION DRIVING PATTERN

HINT:

  • After repairs have been completed, clear the DTCs and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
  • When clearing the permanent DTCs, refer to the Clear Permanent DTC procedure.

    Click here

  1. Connect the Techstream to the DLC3.
  2. Turn the engine switch on (IG) and turn the Techstream on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the engine switch off and wait for 2 minutes or more.
  5. Turn the engine switch on (IG) and turn the Techstream on.
  6. Wait for 11 seconds or more with the engine switch on (IG). [*1]

    HINT:

    [*1] : Normal judgment procedure.

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

  7. Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
  8. Input the DTC: P062F44.
  9. Check the DTC judgment result.

    Techstream Display

    Description

    NORMAL
    • DTC judgment completed
    • System normal

    ABNORMAL
    • DTC judgment completed
    • System abnormal

    INCOMPLETE
    • DTC judgment not completed
    • Perform driving pattern after confirming DTC enabling conditions

    N/A
    • Unable to perform DTC judgment
    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    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 or N/A, perform the normal judgment procedure again.

CAUTION / NOTICE / HINT

NOTICE:

  • Perform the universal trip to clear permanent DTCs.

    Click here

  • Perform registration and/or initialization when parts related to the automatic transaxle are replaced.

    Click here

  • After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

    Click here

PROCEDURE

1.

READ OUTPUT DTC (DTC P062F44)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Clear the DTCs.

Click here

HINT:

Write down the currently output DTCs before clearing them.

Powertrain > Transmission > Clear DTCs

(e) Turn the engine switch off and turn the Techstream off.

(f) Disconnect the Techstream.

(g) Disconnect the cable from the negative (-) battery terminal and wait for 1 minute.

(h) Connect the cable to the negative (-) battery terminal.

(i) Connect the Techstream to the DLC3.

(j) Turn the engine switch on (IG).

(k) Turn the Techstream on.

(l) Enter the following menus: Powertrain / Transmission / Trouble Codes.

Powertrain > Transmission > Trouble Codes

(m) Read the DTCs using the Techstream.

Result

Proceed to

DTCs are not output

A

DTC P062F44 is output

B
A

CHECK FOR INTERMITTENT PROBLEMS

B

2.

REPLACE ECM

(a) Replace the ECM.

Click here

NEXT

PERFORM A/T CODE REGISTRATION

    Starter Relay Circuit Short to Battery (P061512)
    DESCRIPTION While the engine is being cranked, battery voltage is applied to terminal STA of the ECM. If the ECM detects the starter control (STA) signal while the vehicle is being driven, it determin ...

    Brake Switch "B" Circuit Short to Battery (P070312)
    DESCRIPTION The purpose of the stop light switch signal circuit is to prevent the engine from stalling when the brakes are suddenly applied while driving in the lock-up condition. When the brake pedal ...

    Other materials:

    Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Audio And Visual System (for 8 Inch Display): CD cannot be Inserted / Played or CD is Ejected Right After Insertion
    CAUTION / NOTICE / HINT NOTICE: Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Audio and Visual System. Click here PROCEDURE 1. CHECK IF A PROPER CD IS INSERTED ...

    Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Seat Heater System: Lost Communication with Rear Panel LIN (B14B3)
    DESCRIPTION The refreshing seat switch (for rear side)*1 or rear seat heater switch*2 communicates with the air conditioning amplifier assembly via LIN communication. If the LIN communication system is malfunctioning, the air conditioning amplifier assembly will not operate even if the refreshing se ...

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual

    © 2025 Copyright www.lexusrx.net
    0.0108