DTC P0730: Incorrect Gear Ratio: Notes

1. -

DTC detecting condition:

Immediately at fault recognition

Trouble symptom:

Acceleration is poor during standing start.
Shift control malfunction
Engine speed increases abruptly.

CAUTION: After servicing or replacing faulty parts, perform the last step of the basic diagnostic procedure. Ref. to TRANSMISSION (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .

CHECK TRANSMISSION FLUID .
Check the amount of ATF. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>CVTF>INSPECTION .

Is the check result OK?

Yes : Go to 2 .

No : Adjust the amount of ATF. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>CVTF>INSPECTION .
CHECK TRANSMISSION FLUID .
Check the condition of ATF. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>CVTF>REPLACEMENT .

Is the check result OK?

Yes : Return ATF. Go to 3 .

No : Check according to the "Corrective action" of ATF (CVTF) "CONDITION CHECK". Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>CVTF>REPLACEMENT .
CHECK INPUT SIGNAL FOR TCM .
1. Lift up the vehicle.
2. Start the engine.
3. Warm up until the ATF temperature reaches to 40 - 70°C (104 - 158°F).
4. Depress the brake pedal, and shift the select lever to "D" range.
5. Shift the select lever to "P" range.
6. Stabilize the engine speed at idle.
7. Read the data of [Actual Secondary Pressure] using Subaru Select Monitor. Ref. to TRANSMISSION (DIAGNOSTICS)>DATA MONITOR .
Is [Actual Secondary Pressure] 0.5 - 1.5 MPa?

Yes : Go to 4 .

No : Perform the diagnosis according to DTC P0841. Ref. to TRANSMISSION (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC P0841: TRANSMISSION FLUID PRESSURE SENSOR/SWITCH "A" CIRCUIT RANGE/PERFORMANCE .
CHECK INPUT SIGNAL FOR TCM .
1. Set the select lever to "D" range.
2. Release the brake pedal to stabilize the engine speed and front wheel speed.
3. Read the data of [Actual Gear Ratio] using Subaru Select Monitor. Ref. to TRANSMISSION (DIAGNOSTICS)>DATA MONITOR .
Is [Actual Gear Ratio] 1.5 - 2.7?

Yes : Go to 5 .

No : Go to 6 .
CHECK INPUT SIGNAL FOR TCM .
1. Set the select lever to "D" range.
2. Slowly increase the speed to 40 km/h (25 MPH) and keep the constant speed.
3. Read the data of [Actual Gear Ratio] using Subaru Select Monitor. Ref. to TRANSMISSION (DIAGNOSTICS)>DATA MONITOR .
Is [Actual Gear Ratio] 0.5 - 1.0?

Yes : Go to 6 .

No : Replace the transmission assembly. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>TRANSMISSION ASSEMBLY .
CHECK BY INSPECTION MODE .
1. Using the Subaru Select Monitor, perform the clear memory. Ref. to COMMON (DIAG)>CLEAR MEMORY .
2. Execute the inspection mode. Ref. to TRANSMISSION (DIAGNOSTICS)>INSPECTION MODE .
Does the AT OIL TEMP light blink and is DTC P0730 displayed?

Yes : Replace the transmission assembly. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580)>TRANSMISSION ASSEMBLY .

No : Current condition is normal. It is possible that temporary poor contact occurs.