Error 79 Automatic transmission Subaru Forester SF5
Error description:
Error 79 indicates a malfunction in the automatic transmission control system, namely:
*Transmission Position Sensor (TPS) problem
*TPS wiring harness problem
* Malfunction in the transmission control module (TCM)
Possible causes of the error:
* Faulty TPS sensor
* Damaged TPS wiring harness
* Corroded or loose electrical connections
*TCM malfunction
Consequences of the error:
* Automatic transmission may go into emergency operation mode
*Shifting gears may be difficult or impossible
* Deteriorating fuel economy
* Transmission fluid leaks
Diagnosis and elimination:
1. Check TPS sensor: Check the resistance of the TPS sensor and its connector for damage or corrosion. Replace the sensor if it is faulty.
2. TPS Harness Inspection: Inspect the wiring harness connecting the TPS sensor to the TCM for kinks, damage, or poor connections. Repair or replace the wiring harness as necessary.
3. TCM Check: If the TPS sensor and wiring harness are in good condition, the problem may be in the TCM. For diagnostics and possible flashing or replacement of the TCM, professional equipment and software will be required.
Additional recommendations:
* Check the transmission fluid level regularly.
* Avoid sudden acceleration and braking, as this may increase the load on the automatic transmission.
* Maintain your automatic transmission regularly, including replacing the fluid and filter.
*If you experience any problems with shifting gears, do not ignore them. Contact a qualified mechanic for diagnosis and repair.