Using Output State Control (OSC) and Accessing PIDs
To confirm that the OSC value was sent by the scan 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 - °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 |