Lexus ES: Pressure Control Solenoid "L" Actuator Stuck Off (P08BA7F)

Lexus ES (XZ10) Service Manual / Drivetrain / Ub80f (automatic Transmission / Transaxle) / Automatic Transaxle System / Pressure Control Solenoid "L" Actuator Stuck Off (P08BA7F)

DESCRIPTION

Based on signals from the transmission revolution sensors (NT and NC), the actual gear is detected.

The ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical malfunctions of the solenoid valves, transmission valve body assembly and automatic transaxle assembly (clutch, brake, gear, etc.).

Actual gear when solenoid (SL6) valve malfunction occurs (without fail-safe control):

ECM commanded gear	1st	2nd	3rd	4th	5th	6th	7th	8th
*: Neutral
Actual gear during SL6 stuck ON malfunction	1st	N*	3rd	4th	5th	6th	7th	N*
Actual gear during SL6 stuck OFF malfunction	N*	2nd	3rd	4th	5th	6th	7th	8th

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory	Note
P08BA7F	Pressure Control Solenoid "L" Actuator Stuck Off	All of the following conditions are met (2-trip detection logic): Engine coolant temperature is 40°C (104°F) or higher. ATF temperature is -10°C (14°F) or higher. The vehicle is being driven with the shift lever in D. No malfunctions are detected in the solenoid (SL1, SL2, SL3, SL4, SL5, SL6, SL, SLU and SLT) valves, transmission revolution sensors (NT and NC), coolant temperature sensor, oil temperature sensor, knock sensor, crankshaft position sensor circuits, electronic throttle or CAN communication system. Any of the following conditions are met: When the ECM commands the transaxle to shift to 2nd or 8th gear, the engine overruns (neutral status) When the ECM commands the transaxle to shift to 1st gear, the engine overruns (neutral status).	Solenoid (SL1) valve Solenoid (SL2) valve Solenoid (SL3) valve Solenoid (SL4) valve Solenoid (SL5) valve Solenoid (SL6) valve Solenoid (SL) valve Solenoid (SLU) valve Solenoid (SLT) valve Transmission valve body assembly Torque converter assembly Automatic transaxle assembly (clutch, brake, gear, etc.)	Comes on	DTC stored	SAE Code: P08BB

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P08BA7F

Pressure Control Solenoid "L" Actuator Stuck Off

All of the following conditions are met (2-trip detection logic):

Engine coolant temperature is 40°C (104°F) or higher.
ATF temperature is -10°C (14°F) or higher.
The vehicle is being driven with the shift lever in D.
No malfunctions are detected in the solenoid (SL1, SL2, SL3, SL4, SL5, SL6, SL, SLU and SLT) valves, transmission revolution sensors (NT and NC), coolant temperature sensor, oil temperature sensor, knock sensor, crankshaft position sensor circuits, electronic throttle or CAN communication system.
Any of the following conditions are met:
- When the ECM commands the transaxle to shift to 2nd or 8th gear, the engine overruns (neutral status)
- When the ECM commands the transaxle to shift to 1st gear, the engine overruns (neutral status).

Solenoid (SL1) valve
Solenoid (SL2) valve
Solenoid (SL3) valve
Solenoid (SL4) valve
Solenoid (SL5) valve
Solenoid (SL6) valve
Solenoid (SL) valve
Solenoid (SLU) valve
Solenoid (SLT) valve
Transmission valve body assembly
Torque converter assembly
Automatic transaxle assembly (clutch, brake, gear, etc.)

Comes on

DTC stored

SAE Code:

P08BB

DTC Detection Condition Patterns:

		Vehicle Condition
		Pattern 1	Pattern 2	Pattern 3
Diagnostic Condition	Engine coolant temperature is 40°C (104°F) or higher.	○	○	○
	ATF temperature is -10°C (14°F) or higher.	○	○	○
	The vehicle is being driven with the shift lever in D.	○	○	○
	No malfunctions are detected in the solenoid (SL1, SL2, SL3, SL4, SL5, SL6, SL, SLU and SLT) valves, transmission revolution sensors (NT and NC), coolant temperature sensor, oil temperature sensor, knock sensor, crankshaft position sensor circuits, electronic throttle or CAN communication system.	○	○	○
Malfunction Condition	When the ECM commands the transaxle to shift to 2nd gear, the engine overruns (neutral status).	○	-	-
	When the ECM commands the transaxle to shift to 8th gear, the engine overruns (neutral status).	-	○	-
	When the ECM commands the transaxle to shift to 1st gear, the engine overruns (neutral status).	-	-	○
Duration		-	-	-
Detection Logic		2-trip detection logic	2-trip detection logic	2-trip detection logic

HINT:

This DTC is stored when any of the above detection patterns is met.

MONITOR DESCRIPTION

The ECM commands gear shifts by turning the solenoid valves on and off. According to the input shaft revolution (speed) and output shaft revolution (speed), the ECM detects the actual gear (1st, 2nd, 3rd, 4th, 5th, 6th, 7th or 8th gear). When the gear commanded by the ECM and the actual gear are not the same, the ECM illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Related DTCs	P08BB: Solenoid (SL6) valve/OFF malfunction Solenoid (SL6) valve/ON malfunction
Required sensors/components	Solenoid (SL6) valve
Frequency of operation	Continuous
Duration	OFF malfunction: - ON malfunction (A) and (B): 0.5 sec. ON malfunction (C): -
MIL operation	2 driving cycles
Sequence of operation	None

TYPICAL ENABLING CONDITIONS

All

The monitor will run whenever the following DTCs are not stored	P0717, P07BF, P07C0 (Turbine speed sensor circuit) P0793, P07C5, P07C6 (Intermediate shaft speed sensor circuit) P0962, P0963 (Solenoid (SL1) valve circuit) P0966, P0967 (Solenoid (SL2) valve circuit) P0970, P0971 (Solenoid (SL3) valve circuit) P2814, P2815 (Solenoid (SL4) valve circuit) P281D, P281E (Solenoid (SL5) valve circuit) P08C1, P08C2 (Solenoid (SL6) valve circuit) P2769, P2770 (Solenoid (SL) valve circuit) P2763, P2764 (Solenoid (SLU) valve circuit) P2720, P2721 (Solenoid (SLT) valve circuit) P0117, P0118 (ECT sensor circuit) P0335, P0337, P0338 (Crankshaft position sensor circuit) P0712, P0713 (ATF temperature sensor circuit (TFT sensor)) P0327, P0328, P0332, P0333 (KCS sensor circuit) P0121, P0122, P0123, P0222, P0223, P0604, P0606, P060A, P060B, P060D, P060E, P061E, P0657, P0658, P2102, P2103, P2111, P2112, P2119, P2135 ((ETCS) Electronic throttle control system) U0100 (CAN communication system)
Shift position	"D", "not R" and "not N"
Elapsed time since shift lever moved from "N" to "D"	4 sec. or more
ATF temperature	-10°C (14°F) or more
Engine	Starting
Fail-safe function does not operate due to the following malfunctions:	-
Solenoid (SL1) valve	Not OFF or ON malfunction (P0746)
Solenoid (SL2) valve	Not OFF or ON malfunction (P0776)
Solenoid (SL3) valve	Not OFF or ON malfunction (P0796)
Solenoid (SL4) valve	Not OFF or ON malfunction (P2808)
Solenoid (SL5) valve	Not OFF or ON malfunction (P2817)
Solenoid (SL6) valve	Not OFF or ON malfunction (P08BB)
Solenoid (SLT) valve	Not OFF malfunction (P2714)
Solenoid (SLU) valve	Not ON malfunction (P2757)
Solenoid (SL) valve	Not ON malfunction (P0741)
All shift solenoids	Not being stopped
Neutral command flag	Not met

OFF malfunction (A)

ECM selected gear	3rd
Neutral state detected when 1st gear commanded	-
Turbine speed - Output speed x (3rd gear ratio)	Less than 50 rpm

ON malfunction (A)

ECM selected gear	3rd
Neutral state detected when 2nd gear commanded	-
Turbine speed - Output speed x (3rd gear ratio)	Less than 50 rpm

ON malfunction (B)

ECM selected gear	5th
Neutral state detected when 8th gear commanded	-
Turbine speed - Output speed x (5th gear ratio)	Less than 50 rpm

Neutral state flag:

Turbine speed - output speed x (ECM selected gear ratio)

1000 rpm or more

Neutral state detection:

Neutral state flag

Any of the following conditions are met: Condition (a), (b) or (c)
- Condition (a)
  
  ECM selected gear
  
  1st
  
  Output speed x 3rd gear ratio
  
  Less than 6500 rpm
  
  Condition (b)
  
  ECM selected gear
  
  2nd
  
  Output speed x 3rd gear ratio
  
  Less than 6500 rpm
  
  Condition (c)
  
  ECM selected gear
  
  8th
  
  Turbine speed - output speed x 5rd gear ratio
  
  More than 50 rpm
  
  Output speed x 5th gear ratio
  
  Less than 6500 rpm

Neutral command flag:

Engine speed	7200 rpm or more
Turbine speed	7200 rpm or more

Any of the following conditions are met: Condition (a) or (b)
- Condition (a)
  
  ECM selected gear
  
  6th, 7th or 8th
  
  Output speed x 5th gear ratio
  
  7200 rpm or more
  
  Condition (b)
  
  ECM selected gear
  
  4th or 5th
  
  Output speed x 3rd gear ratio
  
  7200 rpm or more

TYPICAL MALFUNCTION THRESHOLDS

OFF malfunction

Any of the following conditions are met: OFF malfunction (A) or (B) OFF malfunction (A)

3rd gear pass detection

Met

OFF malfunction (B)

Solenoid (SLT) valve

ON malfunction

ECM selected gear

1st

1st gear pass detection

Not fixed after transition to latest gear

ON malfunction

Any of the following conditions are met: ON malfunction (A), (B) or (C) ON malfunction (A)

3rd gear pass detection

Met

ON malfunction (B)

5th gear pass detection

Met

ON malfunction (C)

Solenoid (SLT) valve

ON malfunction
- Any of the following conditions are met: Condition (a) or (b) Condition (a)
  
  ECM selected gear
  
  2nd
  
  2nd gear pass detection
  
  Not fixed after transition to latest gear
  
  Condition (b)
  
  ECM selected gear
  
  8th
  
  8th gear pass detection
  
  Not fixed after transition to latest gear

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.
When clearing the permanent DTCs, refer to the Clear Permanent DTC procedure.
Click here

Connect the Techstream to the DLC3.
Turn the engine switch on (IG) and turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the engine switch off and wait for 2 minutes or more.
Turn the engine switch on (IG) and turn the Techstream on.
Start the engine.
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.
Stop the vehicle.
Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
Input the DTC: P08BA7F.

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.

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 DTC OUTPUT (IN ADDITION TO DTC P08BA7F)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Powertrain / Transmission / Trouble Codes.

Powertrain > Transmission > Trouble Codes

(e) Read the DTCs using the Techstream.

Result	Proceed to
DTC P08BA7F and DTC P07407E, P07457F, P07757F, P07957F, P27137F, P28167F and/or P28077F are output	A
Only DTC P08BA7F is output	B
DTCs other than P07407E, P07457F, P07757F, P07957F, P08BA7F, P27137F, P28077F and P28167F are also output	C

HINT:

If any DTCs other than P07407E, P07457F, P07757F, P07957F, P08BA7F, P27137F, P28077F and P28167F are output, perform troubleshooting for those DTCs first.
If a solenoid valve is stuck ON or OFF, DTCs for several solenoid valves including the malfunctioning solenoid valve will be stored.

GO TO STEP 3

GO TO DTC CHART

2.	CLEAR DTC AND PERFORM STALL SPEED TEST

(a) Clear the DTCs.

Powertrain > Transmission > Clear DTCs

HINT:

Write down the currently output DTCs before clearing them.

(b) Perform the stall speed test.

Click here

Test Condition	Proceed to
Stall speed test can be performed	A
Stall speed test cannot be performed	B

GO TO STEP 5

3.	INSPECT SOLENOID (SL1), (SL2), (SL3), (SL4), (SL5) AND (SL6) VALVE

(a) Remove the solenoid (SL1), (SL2), (SL3), (SL4), (SL5) and (SL6) valves.

Click here

*a	Component without harness connected (Solenoid (SL1), (SL2), (SL3), (SL4), (SL5) and (SL6) Valves)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
Solenoid (SL1) valve connector terminal 1 - terminal 2	20°C (68°F)	5.0 to 5.6 Ω
Solenoid (SL2) valve connector terminal 1 - terminal 2	20°C (68°F)	5.0 to 5.6 Ω
Solenoid (SL3) valve connector terminal 1 - terminal 2	20°C (68°F)	5.0 to 5.6 Ω
Solenoid (SL4) valve connector terminal 1 - terminal 2	20°C (68°F)	5.0 to 5.6 Ω
Solenoid (SL5) valve connector terminal 1 - terminal 2	20°C (68°F)	5.0 to 5.6 Ω
Solenoid (SL6) valve connector terminal 1 - terminal 2	20°C (68°F)	5.0 to 5.6 Ω

(c) Connect a positive (+) lead from the battery with a 21 W bulb to terminal 1 and a negative (-) lead 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.

REPLACE SOLENOID (SL1), (SL2), (SL3), (SL4), (SL5) OR (SL6) VALVE

4.	INSPECT SOLENOID (SL) VALVE

(a) Remove the solenoid (SL) valve.

Click here

*1	Solenoid (SL) Valve

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
Solenoid (SL) valve connector terminal - Solenoid (SL) valve body	20°C (68°F)	11 to 15 Ω

(c) Connect a positive (+) lead from the battery to the terminal of the solenoid valve connector, and a negative (-) lead to the solenoid body. Check that the valve moves and makes an operating sound.

OK:

Valve moves and makes an operating sound.

REPLACE SOLENOID (SL) VALVE

5.	INSPECT SOLENOID (SLT) VALVE

(a) Remove the solenoid (SLT) valve.

Click here

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

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

Standard Resistance:

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

OK:

Valve moves and makes an operating sound.

REPLACE SOLENOID (SLT) VALVE

6.	INSPECT TRANSMISSION VALVE BODY ASSEMBLY

(a) Inspect the transmission valve body assembly.

Click here

OK:

There is no foreign matter on each valve and they operate smoothly.

REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY

7.	INSPECT TORQUE CONVERTER ASSEMBLY

(a) Inspect the torque converter assembly.

Click here

OK:

The torque converter assembly is normal.

REPAIR OR REPLACE TORQUE CONVERTER ASSEMBLY

8.	REPAIR OR REPLACE AUTOMATIC TRANSAXLE ASSEMBLY

(a) Repair or replace the automatic transaxle assembly.

Click here

PERFORM REGISTRATION

SEE MORE:

Problem Symptoms Table

PROBLEM SYMPTOMS TABLE HINT: Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspect

Brake Switch "B" Circuit Short to Battery (P070312)

DESCRIPTION The purpose of the stop light switch signal circuit is to prevent the engine from stalling when the brakes are suddenly applied while driving in the lock-up condition. When the brake pedal is depressed, the stop light switch assembly sends a signal to the ECM. The ECM then cancels the op

Lexus ES: Pressure Control Solenoid "L" Actuator Stuck Off (P08BA7F)

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Problem Symptoms Table

Brake Switch "B" Circuit Short to Battery (P070312)

ECM selected gear	1st
Output speed x 3rd gear ratio	Less than 6500 rpm

ECM selected gear	8th
Turbine speed - output speed x 5rd gear ratio	More than 50 rpm
Output speed x 5th gear ratio	Less than 6500 rpm

ECM selected gear	6th, 7th or 8th
Output speed x 5th gear ratio	7200 rpm or more

ECM selected gear	4th or 5th
Output speed x 3rd gear ratio	7200 rpm or more

ECM selected gear	2nd
2nd gear pass detection	Not fixed after transition to latest gear

ECM selected gear	8th
8th gear pass detection	Not fixed after transition to latest gear