AC60E AUTOMATIC TRANSMISSION / TRANSAXLE AUTOMATIC TRANSMISSION SYSTEM(for 7GR-FKS) P27567F Torque Converter Clutch Pressure Control Solenoid Control Actuator Stuck Off
DESCRIPTION
The ECM uses the signals from the throttle position sensor, air-flow meter, input turbine speed sensor, output shaft speed sensor and crankshaft position sensor to monitor the engagement condition of the lock-up clutch.
The ECM compares the engagement condition of the lock-up clutch with the lock-up schedule in the ECM memory to detect shift solenoid valve SLU, transmission valve body assembly and torque converter assembly mechanical problems.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory | Note |
|---|---|---|---|---|---|---|
| P27567F | Torque Converter Clutch Pressure Control Solenoid Control Actuator Stuck Off | Both conditions are met (2 trip detection logic):
·
Lock-up does not occur when requested. ·
Lock-up occurs when shift solenoid valve SLU is requested to turn on in the lock-up range. |
·
Shift solenoid valve SLU remains open or closed ·
Transmission valve body assembly is blocked ·
Torque converter assembly ·
Automatic transmission assembly (clutch, brake or gear, etc.) ·
Line pressure is too low |
Comes on | DTC stored | SAE Code:
P2757 |
MONITOR DESCRIPTION
Torque converter lock-up is controlled by the ECM based on the transmission revolution sensor (NT), transmission revolution sensor (SP2), engine speed, engine load, engine temperature, vehicle speed, transmission fluid temperature and gear selection. The ECM determines the lock-up status of the torque converter by comparing the engine speed (NE) to the input turbine speed (NT). The ECM calculates the actual transmission gear by comparing the input turbine speed (NT) to the output shaft speed (SP2). When conditions are appropriate, the ECM requests "lock-up" by applying control voltage to shift solenoid valve SLU. When shift solenoid valve SLU is turned on, it applies pressure to the lock-up relay valve and locks the torque converter.
If the ECM detects no lock-up after lock-up has been requested or if it detects lock-up when it is not requested, the ECM interprets this as a fault in shift solenoid valve SLU or lock-up system performance.
The ECM will illuminate the MIL and store the DTC.
- HINT:
-
Example:
-
When any of the following is met, the system judges it as a malfunction.
- ·
There is a difference in rotation speed between the input side (engine speed) and output side (input turbine speed) of the torque converter when the ECM commands lock-up.
(Engine speed is at least 70 rpm more than the input turbine speed.)
·There is no difference in rotation speed between the input side (engine speed) and output side (input turbine speed) of the torque converter when the ECM commands lock-up off.
(The difference between engine speed and input turbine speed is less than 35 rpm.)
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 Lock-up Function in Road Test.
Stop the vehicle.
Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
Input the DTC: P27567F.
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.
ACTIVE TEST
- 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.
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 / Activate the Lock Up Solenoid.
Perform the Active Test according to the display on the GTS.
- Powertrain > Transmission > Active Test
-
Tester Display Measurement Item Control Range Diagnostic Note Activate the Lock Up Solenoid Controls the shift solenoid valves SLU and SL to set the automatic transmission to the lock-up condition. ON/OFF
Start/StopCan be used to check shift solenoid valves SLU and SL operation.
[Vehicle Condition]·Vehicle speed: 70 km/h (44 mph) or more
·Gear: Highest gear
·Throttle valve opening angle: Less than 20%
- Powertrain > Transmission > Active Test
-
Tester Display Activate the Lock Up Solenoid - 50004 373 42008
- HINT:
-
This test can be conducted when the vehicle speed is 70 km/h (44 mph) or more.
Lightly depress the accelerator pedal and check that the engine speed does not change abruptly.
- HINT:
- ·
When changing the accelerator pedal opening angle while driving, if the engine speed does not change, lock-up is on.
·Slowly release the accelerator pedal in order to decelerate, but do not fully release the pedal. (Fully releasing the pedal will close the throttle valve and lock-up may be turned off.)
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 P27567F is output A DTC P27567F and other DTCs are output B
- HINT:
- ·
If any DTCs other than P27567F are output, perform troubleshooting for those DTCs first.
·If only other detected DTCs are related to the shift solenoid valve, continue current inspection procedure then follow the inspection procedures for other detected DTCs.
A
B
| *1 | Shift Solenoid Valve SLU |
Remove shift solenoid valve SLU.
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
Check the torque converter assembly.
- OK:
The torque converter assembly operates normally.
- Result:
Proceed to OK NG
OK
NG