Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: AT Solenoids Operation Shutdown Circuit Stuck Off (P17029F)

Toyota Corolla Cross (2022-2024) Service Manual / Drivetrain / K120f (cvt) / Continuously Variable Transaxle System / AT Solenoids Operation Shutdown Circuit Stuck Off (P17029F)

DESCRIPTION

The TCM continuously monitors its CPU. If the output of the CPU deviates from the standard, the TCM will illuminate the MIL and store this DTC.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P17029F

AT Solenoids Operation Shutdown Circuit Stuck Off

TCM main CPU malfunction (1 trip detection logic)

TCM

Comes on

DTC stored

SAE Code:

P1702

MONITOR DESCRIPTION

The TCM monitors the current flow to the shift solenoid valves. When the ignition switch is ON, if the TCM detects that current is flowing to the shift solenoid valves even though current cut was requested, it will store this DTC.

MONITOR STRATEGY

Related DTCs

P1702: TCM processor performance

Required sensors/Components

TCM

Frequency of operation

Once per driving cycle

Duration

2 times

MIL operation

Immediate

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever the following DTCs are not stored

None

Ignition switch

OFF to ON

TYPICAL MALFUNCTION THRESHOLDS

Actuator cut circuit check

Fail

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. 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 2 minutes or more. [*1]

    HINT:

    [*1]: Normal judgment procedure.

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

  4. Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
  5. Input the DTC: P17029F.
  6. Check the DTC judgment result.

    GTS 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 continuously variable transaxle system are replaced.

    Click here

  • Check that no DTCs are stored after performing initialization.

    Click here

  • After turning the ignition 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

PROCEDURE

1.

CLEAR DTC

(a) Clear the DTCs.

Powertrain > Transmission > Clear DTCs

HINT:

Write down the currently output DTCs before clearing them.

(b) Turn the ignition switch off.

NEXT

2.

CHECK DTC OUTPUT (DTC P17029F)

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

(b) Connect the cable to the negative (-) auxiliary battery terminal.

(c) Turn the ignition switch to ON and wait for 1 minute or more.

(d) Turn the ignition switch off and wait for 2 minutes or more.

HINT:

This DTC is detected after the ignition switch is turned off.

(e) Enter the following menus:

Powertrain > Transmission > Trouble Codes

(f) Read the DTCs using the GTS.

Result

Proceed to

DTCs are not output

A

DTC P17029F is output

B

A

CHECK FOR INTERMITTENT PROBLEMS

Click here

Click here

B

3.

REPLACE TCM

Click here

NEXT

PERFORM REGISTRATION AND INITIALIZATION

for Registration: Click here

for Initialization: Click here

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