DTC P0878:00 [FW6A-EL]

id050225905000

DTC P0878:00

Oil pressure switch No.4 (Oil pressure switch B) stuck off
DETECTION CONDITION
•  Under the following conditions, oil pressure switch No.4 stuck-off detected by combination of gear ratio malfunction and oil pressure switch pattern malfunction:
―  Engine is running.
―  ATF temperature is 20 °C {68 °F} or more.
―  There is no difference between vehicle speed signal from DSC HU/CM and output shaft speed sensor signal.
―  Turbine/input shaft speed sensor and output shaft speed sensor DTC is not recorded.
FAIL-SAFE FUNCTION
•  Inhibits malfunctioning gear.
•  Limits engine torque.
•  Inhibits learning control.
•  Inhibits manual mode.
•  Inhibits neutral idle control.
•  Inhibits i-stop control.
•  Inhibits AAS.
POSSIBLE CAUSE
•  Oil pressure switch No.4 malfunction
•  TCM malfunction
SYSTEM WIRING DIAGRAM
Not applicable

Diagnostic procedure

STEP

INSPECTION

ACTION
1
VERIFY DTC OUTPUT STATUS
•  Is the DTC P1738:00 also present?
Yes
Go to the applicable DTC inspection.
(See DTC P1738:00 [FW6A-EL].)
No
Go to the next step.
2
RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION
Note
•  Recording can be facilitated using the screen capture of the PC function.
•  Record the freeze frame data/snap shot data.
—
Go to the next step.
3
VERIFY RELATED SERVICE INFORMATION AVAILABILITY
•  Verify related Service Information availability.
•  Is any related Service Information available?
Yes
Perform repair or diagnosis according to the available Service Information.
•  If the vehicle is not repaired, go to the next step.
No
Go to the next step.
4
VERIFY THAT DTC IS PRESENT
•  Clear the DTC using the M-MDS.
•  Perform the following procedure to ensure that the DTC has been resolved:
1.  Start the engine.
2.  Verify that the ATF temperature is 20 °C {68 °F} or more.
•  Perform the DTC inspection using the M-MDS.
•  Is the DTC P0878:00 present?
Yes
Replace the control valve body, then go to the next step.
(See CONTROL VALVE BODY REMOVAL/INSTALLATION [FW6A-EL].)
No
DTC troubleshooting completed.
5
RE-PERFORM ON-BOARD DIAGNOSTIC TEST
•  Perform the following procedure to ensure that the DTC has been resolved:
1.  Start the engine.
2.  Verify that the ATF temperature is 20 °C {68 °F} or more.
•  Perform the on-board diagnostic test.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [FW6A-EL].)
No
DTC troubleshooting completed.