DTC P0777:00 [FS5A-EL]

id050221825200

DTC P0777:00

Pressure control solenoid B stuck on
DETECTION CONDITION
•  The TCM detects that rotation ratio of the intermediate shaft rotation speed (PID monitor item “ISS”) to output shaft rotation speed (PID monitor item “OSS”) is 1.11 or more for 5 s when the following conditions are met.
―  Gear position: 5GR
―  Accelerator pedal position: 3.17% or more (MZR 2.0) / 3.67% or more (MZR 2.5)
Diagnostic support note
•  The MIL illuminates if the TCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the TCM.
•  The AT warning light illuminates if the TCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the TCM.
•  PENDING CODE is available.
•  FREEZE FRAME DATA is available.
•  The DTC is stored in the TCM memory.
POSSIBLE CAUSE
•  Deteriorated ATF
•  ATF level low
•  Pressure control solenoid B malfunction
•  Line pressure malfunction
•  Secondary control valve body malfunction
•  TCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
•  Has the FREEZE FRAME DATA been recorded on the repair order?
Yes
Go to the next step.
No
Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2
VERIFY RELATED REPAIR INFORMATION AVAILABILITY
•  Verify related Service Information availability.
•  Is any related repair information available?
Yes
Perform repair or diagnosis according to the available repair information.
•  If the vehicle is not repaired, go to the next step.
No
Go to the next step.
3
INSPECT ATF CONDITION
•  Inspect the ATF condition.
•  Is it normal?
Yes
Go to the next step.
No
Replace the ATF, then go to Step 8.
(See AUTOMATIC TRANSAXLE FLUID (ATF) REPLACEMENT [FS5A-EL])
4
INSPECT ATF LEVEL
•  Inspect the ATF level.
•  Is it normal?
Yes
Go to the next step.
No
Add ATF to the specified level, then go to Step 8.
(See AUTOMATIC TRANSAXLE FLUID (ATF) INSPECTION [FS5A-EL])
5
INSPECT PRESSURE CONTROL SOLENOID B
•  Inspect the pressure control solenoid B.
•  Is there any malfunction?
Yes
Replace the pressure control solenoid B, then go to Step 8.
(See SOLENOID VALVE REMOVAL/INSTALLATION [FS5A-EL].)
No
Go to the next step.
6
INSPECT LINE PRESSURE
•  Perform the “Line Pressures Test”.
•  Is there any malfunction?
Yes
Repair or replace malfunctioning part according to test result, then go to Step 8.
No
Go to the next step.
7
INSPECT SECONDARY CONTROL VALVE BODY
•  Remove the secondary control valve body.
•  Disassemble the secondary control valve body.
•  Inspect the following parts:
―  Shift valve
―  Return spring
―  Hydraulic passage
•  Is there any malfunction?
Yes
Repair or replace malfunctioning part according to inspection result, then go to next step.
No
Replace the transaxle, then go to the next step.
(See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION [FS5A-EL].)
8
VERIFY DTC TROUBLESHOOTING COMPLETED
•  Make sure to reconnect all the disconnected connectors.
•  Clear the DTC using the M-MDS.
•  Perform the following procedure to ensure that the DTC has been resolved:
1.  Drive the vehicle under the following conditions for 5 s or more.
―  5GR
―  Accelerator pedal position: 3.17% or more (MZR 2.0) / 3.67% or more (MZR 2.5)
•  Is the PENDING CODE same as the DTC present?
Yes
Replace the TCM, then go to the next step.
(See TCM REMOVAL/INSTALLATION [FS5A-EL].)
No
Go to the next step.
9
VERIFY NO DTCs ARE PRESENT
•  Perform the “Reading DTCs Procedure”.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [FS5A-EL].)
No
DTC troubleshooting completed.