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 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) |
1000 rpm or more | Neutral state detection:
- 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).
(c) Turn the Techstream on. (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.
| B |
 | GO TO STEP 3 |
| C |
| GO TO DTC CHART |
|
A |
 | |
| 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 |
| B |
| GO TO STEP 5 |
|
A | |
| |
| 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.
| NG |
| REPLACE SOLENOID (SL1), (SL2), (SL3), (SL4), (SL5) OR (SL6) VALVE |
|
OK | |
| |
| 4. |
INSPECT SOLENOID (SL) VALVE |
| (a) Remove the solenoid (SL) valve. Click here
| |
(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.
| NG |
| REPLACE SOLENOID (SL) VALVE |
|
OK | |
| |
| 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 |
(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.
| NG |
| REPLACE SOLENOID (SLT) VALVE |
|
OK | |
| |
| 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.
| NG |
| REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY |
|
OK | |
| |
| 7. |
INSPECT TORQUE CONVERTER ASSEMBLY | (a) Inspect the torque converter assembly.
Click here OK: The torque converter assembly is normal.
| NG |
| REPAIR OR REPLACE TORQUE CONVERTER ASSEMBLY |
|
OK | |
| |
| 8. |
REPAIR OR REPLACE AUTOMATIC TRANSAXLE ASSEMBLY |
(a) Repair or replace the automatic transaxle assembly. Click here
| NEXT | |
PERFORM REGISTRATION | |
