Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1999 Subaru Forester BaseFACTORY OEM SERVICE PROCEDURE
Automatic Transmission
NOTE:
Retrieval of some diagnostic codes may require the use of special OEM tester or flash method using instrument cluster indicator. For procedures/testing of codes not shown below, refer to appropriate system article.
AUTOMATIC TRANSMISSION DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC | Description | ||
|---|---|---|---|
| P0725 | Engine Speed Sensor | ||
| P0102 | Mass Airflow Sensor Circuit Low Input | ||
| P0103 | Mass Airflow Sensor Circuit High Input | ||
| P0710 | ATF Temperature Sensor | ||
| P1700 | Throttle Position Sensor Circuit | ||
| P0720 | Vehicle Speed Sensor No. 2 | ||
| P0715 | Torque Converter Turbine Speed Sensor Circuit Malfunction | ||
| P1103 | Torque Control Signal Circuit Malfunction 1 | ||
| P1106 | Torque Control Signal Circuit Malfunction 2 | ||
| 45 | Transmission Load Signal (2200cc California Vehicles) | ||
| P0753 | Shift Solenoid No. 1 | ||
| P0758 | Shift Solenoid No. 2 | ||
| P1703 | Low Clutch Timing Control Solenoid Valve Circuit Malfunction | ||
| P1704 | 2-4 Brake Timing Control Solenoid Valve Circuit Malfunction | ||
| P0748 | Duty Solenoid "A" | ||
| P1705 | Duty Solenoid "D" | ||
| P0743 | Duty Solenoid "B" | ||
| P0500 | Vehicle Speed Sensor Malfunction | ||
| P0703 | Brake Switch Input Malfunction | ||
| P0705 | Transmission Range Sensor Circuit Malfunction | ||
| P0731 | Gear 1 Incorrect Ratio | ||
| P0732 | Gear 2 Incorrect Ratio | ||
| P0733 | Gear 3 Incorrect Ratio | ||
| P0734 | Gear 4 Incorrect Ratio | ||
| P0740 | Torque Converter Clutch System Malfunction | ||
| P1101 | Neutral Position Switch Circuit High Input | ||
| P1102 | Pressure Source Switching Solenoid Valve Circuit Low Input | ||
| P1115 | Torque Control Cut Signal Circuit High Input | ||
| P1116 | Torque Control Cut Signal Circuit Low Input | ||
| P1121 | Neutral Position Switch Circuit Low Input | ||
| P1122 | Pressure Source Switching Solenoid Valve Circuit High Input | ||
| P1540 (1) | Vehicle Speed Sensor No. 2 Malfunction | ||
| P1701 | Cruise Control Set Signal Circuit Malfunction | ||
| P1702 | Transmission Diagnosis Input Signal Circuit Low Input | ||
| P1722 | Transmission Diagnosis Input Signal Circuit High Input | ||
| P1742 | Transmission Diagnosis Input Signal Circuit Malfunction | ||
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Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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