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 Monitoring PIDs
To confirm that the OSC value was sent by the Scan Tool and the powertrain control module (PCM) has accepted the OSC substitution, a corresponding PID for each OSC parameter must be monitored. After sending the OSC value the corresponding PID value should equal the OSC value. Additional PIDs should be monitored to help the technician adequately diagnose the transmission. The following is a list of PIDs to monitor while using OSC.
| OSC Parameter | Corresponding PID | Additional PIDs |
|---|---|---|
| SSA | SSA | SS1F |
| SSB | SSB | SS2F |
| SSC | SSC | SS3F |
| CCS | CCS | CCSF |
| EPC | EPC | - |
| TCC | TCC | TCCF, TCCCMD, TCCACT |
| GEAR | GEAR | TP, RPM, TSS, OSS, TR, TFT, TRANRAT and VS |
| PID Name | PID description |
|---|---|
| CCS | Coast clutch solenoid commanded state (not actual state) - ON or OFF |
| CSSF | Coast clutch solenoid circuit fault - YES or NO |
| EPC | Electronic pressure control commanded pressure (not actual) - PSI |
| GEAR | GEAR commanded state (not actual) 1st, 2nd, 3rd or 4th |
| OSS | Output shaft speed sensor input - RPM |
| RPM | Engine speed sensor input - RPM |
| SSA | Shift solenoid No. 1 commanded state (not actual) - ON or OFF |
| SSB | Shift solenoid No. 2 commanded state (not actual) - ON or OFF |
| SSC | Shift solenoid No. 3 commanded state (not actual) - ON or OFF |
| SS1F | Shift solenoid No. 1 circuit fault - YES or NO |
| SS2F | Shift solenoid No. 2 circuit fault - YES or NO |
| SS3F | Shift solenoid No. 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 fault - YES or NO |
| TFT | Transmission fluid temperature - degrees F° or voltage |
| TP | Throttle position - voltage |
| TR | Transmission range sensor - PARK, NEUTRAL, OVERDRIVE |
| TRANRAT | Actual transmission gear ratio - unitless |
| TSS | Turbine shaft speed sensor input - RPM |
| VS | Vehicle speed sensor input - RPM |
To confirm that the OSC substitution occurred, SEND the OSC value and monitor the corresponding PID value. If no ERROR MESSAGE was received and the value of the corresponding PID is the same as the value sent from OSC, the OSC substitution was successful.
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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.