Using Output State Control (OSC) and Monitoring PIDs
To confirm that the OSC value was sent by the NGS and the PCM has accepted the OSC command, a corresponding PID for each OSC parameter must be monitored. After sending the OSC value, the corresponding PID value should be the same as the OSC value. Additional PIDs should be monitored to help the technician accurately diagnose the transmission. The following is a list of PIDs to monitor while using OSC.
PID LIST
| OSC Parameter | Corresponding PID | Additional PIDs |
|---|---|---|
| SSA | SS1 | SS1F |
| SSB | SS2 | SS2F |
| LINEDSD | LINEDSD | EPC |
| OSCTCC | OSCTCC | TCC, TCCF, TCCCMD, TCCACT |
| OSCGEAR | OSCGEAR | GEAR, TP, RPM, TSS, OSS, TR, TFT, TRANRAT and VS |
PID NAME AND DESCRIPTION
| PID Name | PID Description |
|---|---|
| EPC | Electronic pressure control (EPC) commanded pressure (not actual) - psi |
| GEAR | GEAR commanded state (not actual) - 1st, 2nd, 3rd, or 4th |
| LINEDSD | Line pressure commanded (not actual) |
| OSS | Output shaft speed sensor (OSS) 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 |
| SS1F | Shift Solenoid No. 1 circuit fault - YES or NO |
| SS2F | Shift Solenoid No. 2 circuit fault - YES or NO |
| TCCACT | Torque converter clutch (TCC) slippage (engine speed minus turbine speed) - rpm |
| TCCCMD | TCC solenoid commanded state - duty cycle |
| TCCF | TCC solenoid circuit fault - YES or NO |
| TFT | Transmission fluid temperature (TFT) sensor - degrees F or voltage |
| TP | Throttle position (TP) - voltage |
| TR | Transmission range (TR) sensor - PARK, REVERSE, NEUTRAL, OD, etc. |
| TRANRAT | Actual transmission gear ratio |
| TSS | Turbine shaft speed (TSS) sensor input - rpm |