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.
Using Output State Control (OSC) and Accessing PIDs
To confirm that the OSC value was sent by the diagnostic tool and the PCM has accepted the OSC substitution, a corresponding PID for each OSC parameter must be monitored. Additional PIDs should be monitored to help the technician adequately diagnose the transmission.
The following is a list of OSC parameters and their corresponding PID:
| OSC Parameter | Corresponding PID | Additional PIDs |
|---|---|---|
| SS1 | SS1 | SS1F |
| SS2 | SS2 | SS2F |
| SS3 | SS3 | SS3F |
| LINEPDSD | LINEPDSD | EPC |
| TCC | OSCTCC | TCC, TCCF, TCCMD, TCCACT |
| GEAR | OSCGEAR | GEAR, TP, RPM, TSS, OSS, TR, TFT, TRANRAT, VS |
| PID Name | PID Description |
|---|---|
| EPC | Electronic Pressure Control commanded pressure (not actual) - PSI |
| GEAR | GEAR commanded state (not actual) - 1st, 2nd, 3rd or 4th |
| LINEPDSD | Line Pressure commanded (not actual) |
| OSS | Output Shaft Speed sensor input - RPM |
| RPM | Engine Speed sensor input - RPM |
| SS1 | Shift Solenoid 1 commanded state (not actual) - ON or OFF |
| SS2 | Shift Solenoid 2 commanded state (not actual) - ON or OFF |
| SS3 | Shift Solenoid 3 commanded state (not actual) - ON or OFF |
| SS1F | Shift Solenoid 1 circuit fault - YES or NO |
| SS2F | Shift Solenoid 2 circuit fault - YES or NO |
| SS3F | Shift Solenoid 3 circuit fault - YES or NO |
| TCCACT | Torque Converter Clutch slippage (engine speed minus turbine speed) - RPM |
| TCCCMD | Torque Converter Clutch Solenoid commanded state - Duty Cycle |
| TCCF | Torque Converter Clutch Solenoid circuit fault - YES or NO |
| TFT | Transmission Fluid Temperature - Degrees F or Voltage |
| TP | Throttle Position - Voltage |
| TR | Transmission range sensor - PARK, REVERSE, NEUTRAL, OVERDRIVE, etc. |
| TRANRAT | Actual transmission gear ratio - Unitless |
| TSS | Turbine Shaft Speed Sensor input - RPM |
| VS | Vehicle Speed Sensor input - MPH |
NO RELATED
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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.