Subaru Legacy IV (2008 year). Service manual — part 775
5AT(diag)-115
General Diagnostic Table
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Hold at “D” range or 2nd on manual mode.
• Fluid level and condition
• Vehicle speed sensor 1 and vehicle speed sensor 2
• Forward brake solenoid valve
• Line pressure
• Up switch signal
• Down switch signal
• CAN communication signal
• Accelerator pedal position sensor
Hold at “D” range or 3rd on manual mode.
• Fluid level and condition
• Vehicle speed sensor 1 and vehicle speed sensor 2
• Line pressure
• Up switch signal
• Down switch signal
• CAN communication signal
• Accelerator pedal position sensor
Hold at “D” range or 4th on manual mode.
• Fluid level and condition
• Vehicle speed sensor 1 and vehicle speed sensor 2
• Oil pressure switch 3 and input clutch solenoid valve
• Oil pressure switch 4 and direct clutch solenoid valve
• Oil pressure switch 5 and high & low reverse clutch solenoid
valve
• Forward brake solenoid valve
• Front brake solenoid valve
• Line pressure
• Up switch signal
• Down switch signal
• CAN communication signal
• Accelerator pedal position sensor
• TCM power supply
Hold at “D” range or 5th on manual mode.
• Fluid level and condition
• Vehicle speed sensor 1 and vehicle speed sensor 2
• Oil pressure switch 1 and front brake solenoid valve
• Line pressure
• Down switch signal
• CAN communication signal
• Accelerator pedal position sensor
Gear does not shift 1st of “D” range
o 2nd of “D” range or “1st
of manual mode”
o “2nd of manual mode”.
• Fluid level and condition
• Vehicle speed sensor 1 and vehicle speed sensor 2
• Oil pressure switch 4 and direct clutch solenoid valve
• Line pressure
• Up switch
• CAN communication signal
• Accelerator pedal position sensor
Gear does not shift 2nd of “D” range
o 3rd of “D” range or “2nd
of manual mode”
o “3rd of manual mode”.
• Fluid level and condition
• Vehicle speed sensor 1 and vehicle speed sensor 2
• Oil pressure switch 5 and high & low reverse clutch solenoid
valve
• Line pressure
• Up switch signal
• CAN communication signal
• Accelerator pedal position sensor
Gear does not shift 3rd of “D” range
o 4th of “D” range or “3rd
of manual mode”
o “4th of manual mode”.
• Fluid level and condition
• Vehicle speed sensor 1 and vehicle speed sensor 2
• Oil pressure switch 3 and input clutch solenoid valve
• Oil pressure switch 1 and front brake solenoid valve
• Line pressure
• Up switch signal
• CAN communication signal
• Accelerator pedal position sensor
Symptom
Problem parts
5AT(diag)-116
General Diagnostic Table
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Gear does not shift 4th of “D” range
o 5th of “D” range or “4th
of manual mode”
o “5th of manual mode”.
• Fluid level and condition
• Vehicle speed sensor 1 and vehicle speed sensor 2
• Oil pressure switch 1 and front brake solenoid valve
• Oil pressure switch 4 and direct clutch solenoid valve
• Turbine speed sensor 1 and turbine speed sensor 2
• ATF temperature sensor
• Line pressure
• Up switch signal
• CAN communication signal
• Accelerator pedal position sensor
Gear does not shift down to 4th on “D” range or manual mode.
• Fluid level and condition
• Vehicle speed sensor 1 and vehicle speed sensor 2
• Oil pressure switch 1 and front brake solenoid valve
• Oil pressure switch 4 and direct clutch solenoid valve
• Line pressure
• Down switch signal
• CAN communication signal
• Accelerator pedal position sensor
Gear does not shift down to 3rd on “D” range or manual mode.
• Fluid level and condition
• Vehicle speed sensor 1 and vehicle speed sensor 2
• Oil pressure switch 3 and input clutch solenoid valve
• Oil pressure switch 1 and front brake solenoid valve
• Line pressure
• Down switch signal
• CAN communication signal
• Accelerator pedal position sensor
• TCM power supply
Gear does not shift down to 2nd on “D” range or manual mode.
• Fluid level and condition
• Vehicle speed sensor 1 and vehicle speed sensor 2
• Oil pressure switch 5 and high & low reverse clutch solenoid
• Line pressure
• Down switch signal
• CAN communication signal
• Accelerator pedal position sensor
Gear does not shift down to 1st on “D” range or manual mode.
• Fluid level and condition
• Vehicle speed sensor 1 and vehicle speed sensor 2
• Oil pressure switch 4 and direct clutch solenoid valve
• Line pressure
• Down switch signal
• CAN communication signal
• Accelerator pedal position sensor
No lock-up occurs.
• Fluid level and condition
• Line pressure
• Engine speed signal
• Turbine speed sensor 1 and turbine speed sensor 2
• Lock up solenoid valve
• CAN communication signal
• ATF temperature sensor
• Accelerator pedal position sensor
• Brake switch signal
• Range signal
No shift shock occurred when shifting 1st of “D” range
o 2nd of
“D” range or “1st of manual mode”
o “2nd of manual mode”. Or
clutch slipping occurred.
• Fluid level and condition
• Vehicle speed sensor 1 and vehicle speed sensor 2
• Oil pressure switch 4 and direct clutch solenoid valve
• Line pressure
• CAN communication signal
Symptom
Problem parts
5AT(diag)-117
General Diagnostic Table
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
No shift shock occurred when shifting 2nd of “D” range
o 3rd of
“D” range or “2nd of manual mode”
o 3rd of manual mode”. Or
clutch slipping occurred.
• Fluid level and condition
• Vehicle speed sensor 1 and vehicle speed sensor 2
• Oil pressure switch 5 and high & low reverse clutch solenoid
valve
• Line pressure
• CAN communication signal
No shift shock occurred when shifting 3rd of “D” range
o 4th of
“D” range or “3rd of manual mode”
o “4th of manual mode”. Or
clutch slipping occurred.
• Fluid level and condition
• Vehicle speed sensor 1 and vehicle speed sensor 2
• Oil pressure switch 3 and input clutch solenoid valve
• Oil pressure switch 1 and front brake solenoid valve
• Line pressure
• CAN communication signal
No shift shock occurred when shifting 4th of “D” range
o 5th of
“D” range or “4th of manual mode”
o “5th of manual mode”. Or
clutch slipping occurred.
• Fluid level and condition
• Vehicle speed sensor 1 and vehicle speed sensor 2
• Oil pressure switch 1 and front brake solenoid valve
• Oil pressure switch 4 and direct clutch solenoid valve
• Line pressure
• Accelerator pedal position sensor
• Throttle position sensor
Engine skids when shifting 5th of “D” range
o 4th of “D” range
or “5th of manual mode”
o “4th of manual mode”. Or slipping
occurred.
• Fluid level and condition
• Vehicle speed sensor 1 and vehicle speed sensor 2
• Oil pressure switch 1 and front brake solenoid valve
• Oil pressure switch 4 and direct clutch solenoid valve
• Line pressure
• Accelerator pedal position sensor
• Throttle position sensor
Engine skids when shifting 4th of “D” range
o 3rd of “D” range
or “4th of manual mode”
o “3rd of manual mode”. Or slipping
occurred.
• Fluid level and condition
• Vehicle speed sensor 1 and vehicle speed sensor 2
• Oil pressure switch 3 and input clutch solenoid valve
• Oil pressure switch 1 and front brake solenoid valve
• Line pressure
• Accelerator pedal position sensor
• Throttle position sensor
Engine skids when shifting 3rd of “D” range
o 2nd of “D” range
or “3rd of manual mode”
o “2nd of manual mode”. Or slipping
occurred.
• Fluid level and condition
• Vehicle speed sensor 1 and vehicle speed sensor 2
• Oil pressure switch 5 and high & low reverse clutch solenoid
valve
• Oil pressure switch 4 and direct clutch solenoid valve
• Line pressure
• Accelerator pedal position sensor
• Throttle position sensor
Engine skids when shifting 2nd of “D” range
o 1st of “D” range
or “2nd of manual mode”
o “1st of manual mode”. Or slipping
occurred.
• Fluid level and condition
• Vehicle speed sensor 1 and vehicle speed sensor 2
• Oil pressure switch 4 and direct clutch solenoid valve
• Line pressure
• Accelerator pedal position sensor
• Throttle position sensor
Engine brake does not function at 5th
o 4th of manual mode.
• Inhibitor switch
• Fluid level and condition
• Control cable adjustment
• Manual mode switch
• Oil pressure switch 1
• Down switch signal
Engine brake does not function at 4th
o 3rd of manual mode.
• Inhibitor switch
• Fluid level and condition
• Control cable adjustment
• Manual mode switch
• Oil pressure switch 1 and oil pressure switch 3
• Down switch signal
Symptom
Problem parts
5AT(diag)-118
General Diagnostic Table
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Engine brake does not function at 3rd
o 2nd of manual mode.
• Inhibitor switch
• Fluid level and condition
• Control cable adjustment
• Manual mode switch
• Oil pressure switch 5
• Forward brake solenoid valve
Engine brake does not function at 2nd
o 1st of manual mode.
• Inhibitor switch
• Fluid level and condition
• Control cable adjustment
• Manual mode switch
• Oil pressure switch 4
• Forward brake solenoid valve
Excessive acceleration failure on “D” range.
• Fluid level and condition
• Line pressure
• Accelerator pedal position sensor
• Throttle position sensor
• CAN communication signal
• Inhibitor switch
• Control cable adjustment
• Vehicle speed sensor 1, 2
Excessive acceleration failure in “R” range.
• Fluid level and condition
• Line pressure
• Accelerator pedal position sensor
• Throttle position sensor
• Oil pressure switch 5 and high & low reverse clutch solenoid
valve
• CAN communication signal
• Inhibitor switch
• Control cable adjustment
• Vehicle speed sensor 1, 2
Engine skids when start driving (1st) the vehicle. Or slipping
occurred.
• Fluid level and condition
• Line pressure
• Accelerator pedal position sensor
• Throttle position sensor
• CAN communication signal
Engine skids when driving at 2nd. Or slipping occurred.
• Fluid level and condition
• Line pressure
• Accelerator pedal position sensor
• Throttle position sensor
• CAN communication signal
• Oil pressure switch 4 and direct clutch solenoid valve
Engine skids when driving at 3rd. Or slipping occurred.
• Fluid level and condition
• Line pressure
• Accelerator pedal position sensor
• Throttle position sensor
• CAN communication signal
• Oil pressure switch 5 and high & low reverse clutch solenoid
valve
Engine skids when driving at 4th. Or slipping occurred.
• Fluid level and condition
• Line pressure
• Accelerator pedal position sensor
• Throttle position sensor
• CAN communication signal
• Oil pressure switch 3 and input clutch solenoid valve
Symptom
Problem parts
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