- DTC judgment completed
- System normal
| Last Modified: 07-31-2024 | 6.11:8.1.0 | Doc ID: RM100000002B366 |
| Model Year Start: 2023 | Model: Corolla Hatchback | Prod Date Range: [03/2023 - ] |
| Title: K120 / K121 (CVT): K121 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: P170300; AT Solenoid Output Malfunction; 2023 - 2025 MY Corolla Corolla Hatchback [03/2023 - ] | ||
|
DTC |
P170300 |
AT Solenoid Output Malfunction |
DESCRIPTION
The ECM detects an erroneous downshift output to continuously variable transaxle or forward/rearward output malfunction.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
MIL |
DTC Output from |
Priority |
Note |
|---|---|---|---|---|---|---|---|
|
P170300 |
AT Solenoid Output Malfunction |
ECM internal malfunction (1-trip detection logic). |
|
Comes on |
Engine |
B |
SAE Code: P1703 |
MONITOR DESCRIPTION
The ECM monitors the changes in the shift state from belt mode to gear mode and the forward and rearward drive output for abnormalities.
If the vehicle is being driven in gear mode when in the belt mode vehicle speed range and there is a difference between the forward and rearward drive command and result, the ECM detects a malfunction, illuminates the MIL and stores a DTC.
MONITOR STRATEGY
|
Related DTCs |
P1703: Incorrect shift solenoid performance/Functional check |
|
Required sensors/Components |
Crankshaft position sensor Transmission revolution sensor (NC1) Transmission revolution sensor (NSS) Shift solenoid valve SL1 Shift solenoid valve SL2 Shift solenoid valve SLU Shift solenoid valve SC1 Shift solenoid valve SC2 Shift solenoid valve SC3 |
|
Frequency of operation |
Continuous |
|
Duration |
Condition (A): 1 sec. Condition (B): 1 sec. Condition (C): 0.15 sec. Condition (D): 0.15 sec. |
|
MIL operation |
1 driving cycle |
|
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 |
|
- ECM indicate |
Belt mode |
Condition (B)
|
Output speed |
2050 rpm or more |
Condition (C) and (D)
|
Engine speed |
200 rpm or more |
TYPICAL MALFUNCTION THRESHOLDS
Condition (A) and (B)
|
Current of SL1 |
ON |
|
Current of SL2 |
OFF |
|
Current of SC2 |
ON |
Condition (C)
|
Monitor shift position |
N, D or B |
|
Shift position |
R |
Condition (D)
|
Monitor shift position |
N or R |
|
Shift position |
D or B |
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
![2023 - 2025 MY Corolla Corolla Hatchback [03/2023 - ]; K120 / K121 (CVT): K121 CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: DTC CHECK / CLEAR](/t3Portal/stylegraphics/info.gif)
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the ignition switch off and wait for 2 minutes or more.
-
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.
- Enter the following menus: Powertrain / Engine / Utility / All Readiness.
- Input the DTC: P170300.
-
Check the DTC judgment result.
GTS Display
Description
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
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
HINT:
If any DTCs other than P170300 are output, perform troubleshooting for those DTCs first.
PROCEDURE
|
1. |
CHECK DTC OUTPUT (IN ADDITION TO DTC P170300) |
(a) Read the DTCs using the GTS.
Powertrain > Engine > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
Only P170300 is output |
A |
|
P170300 and other DTCs are output |
B |
| B |
|
GO TO DTC CHART |
|
|
2. |
INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE SL1, SL2, SLU, SC1, SC2 and SC3) |
Pre-procedure1
(a) Disconnect the C61 transmission wire connector.
Procedure1
|
(b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
Result:
|
|
Post-procedure1
(c) Connect the C61 transmission wire connector.
| NG |
|
|
|
3. |
CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM) |
Pre-procedure1
(a) Disconnect the C160 ECM connector.
Procedure1
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
C160-56 (SL1+) - C160-57 (SL1-) |
20°C (68°F) |
5.0 to 5.6 Ω |
|
C160-7 (SL2+) - C160-6 (SL2-) |
20°C (68°F) |
5.0 to 5.6 Ω |
|
C160-30 (SLU+) - C160-31 (SLU-) |
20°C (68°F) |
5.0 to 5.6 Ω |
|
C160-3 (SC1) - Body ground |
20°C (68°F) |
11 to 15 Ω |
|
C160-2 (SC2) - Body ground |
20°C (68°F) |
11 to 15 Ω |
|
C160-1 (SC3) - Body ground |
20°C (68°F) |
11 to 15 Ω |
|
C160-56 (SL1+) or C160-57 (SL1-) - Body ground and other terminals |
Always |
10 kΩ or higher |
|
C160-7 (SL2+) or C160-6 (SL2-) - Body ground and other terminals |
Always |
10 kΩ or higher |
|
C160-30 (SLU+) or C160-31 (SLU-) - Body ground and other terminals |
Always |
10 kΩ or higher |
|
C160-3 (SC1) - Other terminals |
Always |
10 kΩ or higher |
|
C160-2 (SC2) - Other terminals |
Always |
10 kΩ or higher |
|
C160-1 (SC3) - Other terminals |
Always |
10 kΩ or higher |
Post-procedure1
(c) Connect the C160 ECM connector.
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION WIRE - ECM) |
|
|
4. |
REPLACE ECM |
HINT:
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, SLU, SC1, SC2 and SC3) |
Click here
| OK |
|
|
|
6. |
REPLACE TRANSMISSION VALVE BODY ASSEMBLY |
HINT:
Click here
| NEXT |
|
PERFORM REGISTRATION AND INITIALIZATION for Registration: Click here
for Initialization: Click here
|
|
|