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 NGS 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:
| Corresponding PID | PID Description |
|---|---|
| BPP | Brake Pedal Position Switch On/Off |
| PCA | Pressure Control Solenoid A - Commanded Pressure |
| PCB | Pressure Control Solenoid B - Commanded Pressure |
| PCC | Pressure Control Solenoid C - Commanded Pressure |
| FIRMST | Firm Shift Control (FMC) status requested by OSC; 0 = FSC not commanded by OSC, NGS PID output = OFF; 1 = FSC commanded by OSC, NGS PID output = ON |
| GEAR | Commanded Transmission Gear (use in drive only) |
| RPM | Engine revolutions per minute |
| SSA | Shift solenoid A commanded ON |
| SSB | Shift solenoid B commanded ON |
| SSC | Shift solenoid C commanded ON |
| SSD | Shift solenoid D commanded ON |
| TCC | Torque converter commanded duty cycles (%) |
| TCCRAT | Torque converter speed ratio (RPM and or TSS) |
| TFT | Transmission fluid temperature (degrees F) |
| VSS | Vehicle speed (mph) |
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, then 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.
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