AC60E AUTOMATIC TRANSMISSION / TRANSAXLE AUTOMATIC TRANSMISSION SYSTEM(for 7GR-FKS) P27137F Pressure Control Solenoid "D" Actuator Stuck Off
DESCRIPTION
The shift solenoid valve SLT controls the transmission line pressure for smooth transmission operation based on signals from the throttle position sensor and the vehicle speed sensor. The ECM adjusts the current to shift solenoid valve SLT to control hydraulic line pressure coming from the primary regulator valve. Appropriate line pressure assures smooth shifting with varying engine outputs.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory | Note |
|---|---|---|---|---|---|---|
| P27137F | Pressure Control Solenoid "D" Actuator Stuck Off | The ECM detects a malfunction in the shift solenoid valve SLT (ON side) according to the difference in the speed between the turbine and the output shaft, and also by the ATF pressure. (2 trip detection logic) | ·
Shift solenoid valve SLT remains open ·
Shift solenoid valve SL1, SL2, SL3 or SL4 remains open or closed ·
Transmission valve body assembly is blocked ·
Automatic transmission assembly (clutch, brake or gear, etc.) |
Comes on | DTC stored | SAE Code:
P2714 |
MONITOR DESCRIPTION
The ECM calculates the amount of clutch slip based on the input turbine speed, output shaft speed, and gear ratio. If the amount of clutch slip exceeds a specified level, the ECM will set this DTC and illuminate the MIL.
When shift solenoid valve SLT remains on, the line pressure goes down and clutch engagement force decreases.
- NOTICE:
-
If the vehicle continues to be driven under these conditions, the clutch will burn up and the vehicle will no longer be drivable.
CONFIRMATION DRIVING PATTERN
- CAUTION:
-
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
- 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.
Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch to ON and turn the GTS on.
Start the engine.
Perform the D Position Shift Test in Road Test.
Stop the vehicle.
Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
Input the DTC: P27137F.
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 Confirmation Driving Pattern and check the DTC judgment result again.
CAUTION / NOTICE / HINT
- NOTICE:
-
Perform registration and/or initialization when parts related to the automatic transmission are replaced.
PROCEDURE
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Powertrain / Transmission / Trouble Codes.
- Powertrain > Transmission > Trouble Codes
- 50001 373
Read the DTCs using the GTS.
- Result:
Result Proceed to Only DTC P27137F is output A P27137F and other DTCs are output B
- HINT:
-
If a solenoid is stuck on, DTCs for several solenoids including the malfunctioning solenoid will be detected.
A
B
- NOTICE:
- ·
Perform the test while the ATF (Automatic Transmission Fluid) temperature is between 50 and 80°C (122 and 176°F).
·Be careful to prevent the hose of SST from interfering with the exhaust pipe.
·This check must be conducted after checking and adjusting the engine.
·Perform the test with the air conditioning off.
- HINT:
-
Using the GTS to perform Active Tests allows relays, VSVs, actuators and other items to be operated without removing any parts. This non-intrusive functional inspection can be very useful because intermittent operation may be discovered before parts or wiring is disturbed. Performing Active Tests early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while performing Active Tests.
Turn the ignition switch off.
Lift the vehicle.
Remove the test plug from the transmission case and connect SST.
- SST
- 09993-19015 (09993-00010, 09993-00040)
Lower the vehicle.
Fully apply the parking brake and chock the 4 wheels.
Connect the GTS to the DLC3.
Start the engine.
Warm up the ATF (Automatic Transmission Fluid).
Measure the line pressure when the engine is idling.
Turn the GTS on.
Enter the following menus: Powertrain / Transmission / Active Test / Activate the Solenoid (SLT).
Perform the Active Test according to the display on the GTS.
Measure the line pressure with SST.
- Powertrain > Transmission > Active Test
-
Tester Display Measurement Item Control Range Diagnostic Note Activate the Solenoid (SLT) Operates shift solenoid valve SLT to raise the line pressure. ON/OFF
- HINT:
-
ON: No action (normal operation)
-
OFF: Line pressure up (When the Active Test of "Activate the Solenoid (SLT)" is performed, the ECM commands the shift solenoid valve SLT to turn off).
[Vehicle Condition]·Vehicle stopped
·Engine idling
- Powertrain > Transmission > Active Test
-
Tester Display Activate the Solenoid (SLT) - 50004 373 14
The "Activate the solenoid (SLT)" Active Test is performed to allow confirmation that the line pressure changes. The line pressure changes are confirmed using the same SST that is used for the Hydraulic Test
- HINT:
-
Note that the pressure readings for the Active Test and Hydraulic Test are different.
- OK:
The line pressure changes as specified when performing the Active Test.
- Result:
Proceed to OK NG
OK
NG
- NOTICE:
-
This test should always be performed with at least 2 people.
Warm up the engine.
Turn the ignition switch off.
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Powertrain / Transmission / Active Test / Control the Shift Position.
Perform the Active Test according to the display on the GTS.
- HINT:
-
Comparing the gear commanded by the Active Test with the actual gear enables confirmation of the problem.
- Powertrain > Transmission > Active Test
-
Tester Display Measurement Item Control Range Diagnostic Note Control the Shift Position Operates the shift solenoid valves to allow gears to be selected manually. 1st/2nd/3rd/4th/5th/6th
Start/StopCan be used to check the operation of the shift solenoid valves.
Up-shifts and down-shifts should be performed consecutively. A 10 second interval is required between gear changes.
Do not down-shift at high speeds. Doing so will damage the automatic transmission.
[Vehicle Condition]50 km/h (31 mph) or less
- Powertrain > Transmission > Active Test
-
Tester Display Control the Shift Position - 50004 373 42009
- HINT:
- ·
This test can be conducted when the vehicle speed is 50 km/h (31 mph) or less.
·The 4th to 5th and 5th to 6th up-shift must be performed with the accelerator pedal released.
·The 6th to 5th and 5th to 4th down-shift must be performed with the accelerator pedal released.
·Do not operate the accelerator pedal for at least 2 seconds after shifting and do not shift successively.
·The gear commanded by the ECM is shown in the Data List / Shift Status display on the GTS.
Compare the ECM commanded gear and actual gear.
- Result:
Actual Gear during Malfunction ECM Commanded Gear Proceed to 1st 2nd 3rd 4th 5th 6th Shift solenoid valve SL1 Stuck ON 1st 2nd 3rd 4th 4th 4th A Stuck OFF N*1 N*1 N*1 N*1 5th 6th Shift solenoid valve SL2 Stuck ON 4th 4th 4th 4th 5th 6th B Stuck OFF 1st 2nd 3rd 1st N*1 N*1 Shift solenoid valve SL3 Stuck ON 2nd 2nd 3rd 4th 5th 6th C Stuck OFF 1st 1st 3rd 4th 5th N*1 Shift solenoid valve SL4 Stuck ON 3rd 3rd 3rd 4th 5th 5th D Stuck OFF 1st 2nd 1st 4th N*1 6th Shift solenoid valve SLT Stuck ON N*2 N*2 N*2 N*2 N*2 N*2 E Stuck OFF*3 1st 2nd 3rd 4th 5th 6th
- HINT:
- ·
*1: Neutral
·*2: If shift solenoid valve SLT is stuck on, the line pressure will be low. Therefore, the amount of torque that can be transmitted by each gear is lower than the normal limit. When the engine power exceeds this lowered limit, the engine speed will increase freely.
·*3: When shift solenoid valve SLT is stuck off, gear shifting is normal.
A
B
C
D
E
| *1 | Shift Solenoid Valve SLT |
Remove shift solenoid valve SLT.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection Condition Specified Condition 1 - 2 20°C (68°F) 5.0 to 5.6 Ω
Apply 12 V battery voltage to the shift solenoid valve and check that the valve moves and makes an operating noise.
- OK:
Measurement Condition Specified Condition ·Battery positive (+) with a 21 W bulb → Terminal 1
·Battery negative (-) → Terminal 2
Valve moves and makes an operating noise
- Result:
Proceed to OK NG
OK
NG
Check the transmission valve body assembly.
- OK:
There is no foreign matter on each valve and they operate smoothly.
- Result:
Proceed to OK NG
OK
NG