UA80F (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: P271312,P271314; Pressure Control Solenoid "D" Circuit Short to Battery; 2018 - 2020 MY Sienna [11/2017

Last Modified: 04-05-2023	6.11:8.1.0	Doc ID: RM10000000196HM
Model Year Start: 2018	Model: Sienna	Prod Date Range: [11/2017 - ]
Title: UA80F (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: P271312,P271314; Pressure Control Solenoid "D" Circuit Short to Battery; 2018 - 2020 MY Sienna [11/2017 - ]

DTC

P271312

Pressure Control Solenoid "D" Circuit Short to Battery

DTC

P271314

Pressure Control Solenoid "D" Circuit Short to Ground or Open

DESCRIPTION

Refer to DTC P27137F.

Click here

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P271312

Pressure Control Solenoid "D" Circuit Short to Battery

1. Diagnosis Condition 2.Malfunction Status 3. Malfunction Time 4. Other

Engine is running
Shift solenoid valve SLT circuit is short to +B
1 second
1-trip detection logic

Shift solenoid valve SLT
Transmission wire
Harness and connector
ECM

Comes on

DTC stored

SAE Code:

P2721

P271314

Pressure Control Solenoid "D" Circuit Short to Ground or Open

1. Diagnosis Condition 2.Malfunction Status 3. Malfunction Time 4. Other

Engine is running
Shift solenoid valve SLT circuit is open or shorted
1 second
1-trip detection logic

Shift solenoid valve SLT
Transmission wire
Harness and connector
ECM

Comes on

DTC stored

SAE Code:

P2720

MONITOR DESCRIPTION

When an open or short to +B and ground in the shift solenoid valve SLT circuit is detected, the ECM will determine that there is a malfunction, illuminate the MIL and store this DTC.

MONITOR STRATEGY

Related DTC	P2720: Shift solenoid valve SLT/Range check (Low current) P2721: Shift solenoid valve SLT/Range check (High current) P2721: Shift solenoid valve SLT/Range check (High voltage)
Required sensors/Components	Shift solenoid valve SLT
Frequency of operation	Continuous
Duration	P2720: 1 sec. Condition (A), 1.1 sec. Condition (B) P2721: 1 sec. (High current), 1.3 sec. (High voltage)
MIL operation	Immediate
Sequence of operation	None

TYPICAL ENABLING CONDITIONS

All

Solenoid current cut status	Not cut
Battery voltage	8 V or more
Ignition Switch	ON
Starter	OFF

P2720

The monitor will run whenever the following DTCs are not present	None
Battery voltage	10.5 V or more
Target current	0.2 A or more

P2721

The monitor will run whenever the following DTCs are not present	None
Battery voltage	10.5 V or more

High current Condition

Following condition is met	Condition a. or b.
a. Battery voltage	8 V or more and less than 12.499 V
Target current	0.8 A or less
b. Battery voltage	12.5 V or more and less than 16 V
Target current	1 A or less

High voltage Condition

Battery voltage	10.5 V or more
Target current	0.2 A or more
Output duty cycle	10% or more and 90% or less

TYPICAL MALFUNCTION THRESHOLDS

P2720

Solenoid current	Less than 0.075 A
Solenoid high current cutout by solenoid driver IC	ON

P2721

High current

Solenoid current	a. or b.
a. Battery voltage	8 V or more and less than 12.499 V
Target current	More than 0.92 A
b. Battery voltage	12.5 V or more and less than 16 V
Target current	More than 1.1 A

High voltage

Solenoid voltage monitor

No signal

COMPONENT OPERATING RANGE

P2720

Solenoid current	0.075 A or more
Solenoid high current cutout by solenoid driver IC	OFF

P2721

High current

Solenoid current	a. or b.
a. Battery voltage	8 V or more and less than 12.499 V
Target current	0.92 A or less
b. Battery voltage	12.5 V or more and less than 16 V
Target current	1.1 A or less

High voltage

Solenoid voltage monitor

Signal input

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

Connect the Techstream to the DLC3.
Turn the ignition switch to ON and turn the Techstream on.
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.
Turn the ignition switch to ON and turn the Techstream on.
Start the engine.
Wait for 2 seconds or more with the engine running. [*1]
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 / Transmission / Utility / All Readiness.
Input the DTC: P271312 or P271314.

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.

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 automatic transaxle are replaced.
Click here

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE (SHIFT SOLENOID VALVE SLT) - ECM)

(a) Disconnect the B67 ECM connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
B67-67 (SLT+) - B67-37 (SLT-)	20°C (68°F)	5.0 to 5.6 Ω
B67-67 (SLT+) or B67-37 (SLT-) - Body ground and other terminals	Always	10 kΩ or higher

GO TO STEP 3

2.	REPLACE ECM

(a) Replace the ECM.

Click here

PERFORM A/T CODE REGISTRATION

3.	CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)

(a) Disconnect the B65 transmission wire connector.

(b) Disconnect the B67 ECM connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
B65-24 (SLT+) - B67-67 (SLT+)	Always	Below 1 Ω
B65-23 (SLT-) - B67-37 (SLT-)	Always	Below 1 Ω
B65-24 (SLT+) or B67-67 (SLT+) - Body ground and other terminals	Always	10 kΩ or higher
B65-23 (SLT-) or B67-37 (SLT-) - Body ground and other terminals	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR (TRANSMISSION WIRE - ECM)

4.	INSPECT SHIFT SOLENOID VALVE SLT

(a) Remove the shift solenoid valve SLT.

Click here

*a	Component without harness connected (Shift Solenoid Valve SLT)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
Shift solenoid valve SLT connector terminal 1 - terminal 2	20°C (68°F)	5.0 to 5.6 Ω

(c) Connect a positive (+) lead from the battery to terminal 1 and a negative (-) lead with a 21 W bulb to terminal 2 of the solenoid valve connector. Check that the valve moves and makes an operating sound.

OK:

Valve moves and makes an operating sound.

REPAIR OR REPLACE TRANSMISSION WIRE

REPLACE SHIFT SOLENOID VALVE SLT