Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: AT Solenoid Output Malfunction (P170300)

Toyota Corolla Cross (2022-2024) Service Manual / Drivetrain / K120 (cvt) / Continuously Variable Transaxle System / AT Solenoid Output Malfunction (P170300)

DESCRIPTION

The TCM controls the shift solenoid valves SL1, SL2 and SLG to change the shift mode from gear mode to belt mode and vice versa.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P170300

AT Solenoid Output Malfunction

Any of the following conditions are met for 1 second or more (2-trip detection logic):

  • The C1 clutch is engaged, C2 clutch is released and S1 synchronizer is engaged when 2 seconds or more have elapsed since the following conditions are met:
    • The transmission revolution sensor (NOUT) signal indicates 1200 rpm or more
    • TCM commands the C1 clutch to be released
    • TCM commands the C2 clutch to be engaged
  • When the transmission revolution sensor (NOUT) signal indicates 2050 rpm or more, the C1 clutch is engaged, C2 clutch is released and S1 synchronizer is engaged.
  • Continuously variable transaxle assembly
  • Wire harness or connector
  • TCM

Comes on

DTC stored

SAE Code:

P1703

MONITOR DESCRIPTION

The TCM monitors the changes in the shift state from belt mode to gear mode for abnormalities.

If the vehicle is being driven in gear mode when in the belt mode vehicle speed range, the TCM detects a malfunction, illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Related DTCs

P1703: Incorrect shift solenoid performance/Functional check

Required sensors/Components

Transmission revolution sensor (NOUT)

Shift solenoid valve SL1

Shift solenoid valve SL2

Shift solenoid valve SLG

Frequency of operation

Continuous

Duration

1 sec.

MIL operation

2 driving cycles

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

Condition (A)

Output speed

1200 rpm or more

Time after following condition is met

2 sec. or more

- TCM indicate

Belt mode
Condition (B)

Output speed

2050 rpm or more

TYPICAL MALFUNCTION THRESHOLDS

Condition (A) and (B)

Shift solenoid valve SL1

ON

Shift solenoid valve SL2

OFF

Shift solenoid valve SLG

ON

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 turn the GTS on.
  4. Start the engine.
  5. Perform the D Position Shift Test inspection in Road Test. [*1]

    Click here

    HINT:

    [*1]: Normal judgment procedure.

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

  6. Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
  7. Input the DTC: P170300.
  8. 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.

WIRING DIAGRAM

Refer to DTC P074512, P077512 and P08C312.

for DTC P074512: Click here

for DTC P077512: Click here

for DTC P08C312: Click here

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

PROCEDURE

1.

CHECK DTC OUTPUT (IN ADDITION TO DTC P170300)

(a) Enter the following menus:

Powertrain > Transmission > Trouble Codes

(b) Read the DTCs using the GTS.

HINT:

If any DTCs other than P170300 are output, perform troubleshooting for those DTCs first.

Result

Proceed to

Only DTC P170300 is output

A

DTC P170300 and other DTCs are output

B
B

GO TO DTC CHART
A

2.

INSPECT CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY (SHIFT SOLENOID VALVE SL1, SL2, SLG)

(a) Disconnect the transmission wire connector.

*a

Component without harness connected

(Transmission Wire)

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

2 (SL1+) - 7 (SL1-)

20°C (68°F)

5.0 to 5.6 Ω

3 (SL2+) - 8 (SL2-)

20°C (68°F)

5.0 to 5.6 Ω

1 (SLG+) - 6 (SLG-)

20°C (68°F)

5.0 to 5.6 Ω

2 (SL1+) or 7 (SL1-) - Body ground and other terminals

Always

10 kΩ or higher

3 (SL2+) or 8 (SL2-) - Body ground and other terminals

Always

10 kΩ or higher

1 (SLG+) or 6 (SLG-) - Body ground and other terminals

Always

10 kΩ or higher

(c) Connect the transmission wire connector.

NG

GO TO STEP 5

OK

3.

CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - TCM)

(a) Disconnect the C80 TCM connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

C80-38 (SL1+) - C80-37 (SL1-)

20°C (68°F)

5.0 to 5.6 Ω

C80-19 (SL2+) - C80-20 (SL2-)

20°C (68°F)

5.0 to 5.6 Ω

C80-21 (SLG+) - C80-22 (SLG-)

20°C (68°F)

5.0 to 5.6 Ω

C80-38 (SL1+) or C80-37 (SL1-) - Body ground and other terminals

Always

10 kΩ or higher

C80-19 (SL2+) or C80-20 (SL2-) - Body ground and other terminals

Always

10 kΩ or higher

C80-21 (SLG+) or C80-22 (SLG-) - Body ground and other terminals

Always

10 kΩ or higher

(c) Connect the C80 TCM connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION WIRE - TCM)
OK

4.

REPLACE TCM

Click here

NEXT

PERFORM REGISTRATION AND INITIALIZATION

for Registration: Click here

for Initialization: Click here

5.

INSPECT TRANSMISSION VALVE BODY ASSEMBLY (SHIFT SOLENOID VALVE SL1, SL2 AND SLG)

(a) Disconnect the transmission wire connector from the shift solenoid valves SL1, SL2 and SLG.

Click here

*1

Transmission Valve Body Assembly

*2

Shift Solenoid Valve SLG

*3

Shift Solenoid Valve SL1

*4

Shift Solenoid Valve SL2

*a

Component without harness connected

(Shift Solenoid Valve SL1, SL2 and SLG)

-

-

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

Shift solenoid valve SL1 connector terminal 1 - terminal 2

20°C (68°F)

5.0 to 5.6 Ω

Shift solenoid valve SL2 connector terminal 1 - terminal 2

20°C (68°F)

5.0 to 5.6 Ω

Shift solenoid valve SLG connector terminal 1 - terminal 2

20°C (68°F)

5.0 to 5.6 Ω
OK

REPLACE TRANSMISSION WIRE

NG

6.

REPLACE CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY

Click here

NEXT

PERFORM REGISTRATION AND INITIALIZATION

for Registration: Click here

for Initialization: Click here

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