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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 or PIDs for each OSC parameter should be monitored. Additional PIDs should be monitored to help the technician adequately diagnose the transaxle.

The following is a list of OSC parameters and their corresponding PIDs:

OSC Parameter Corresponding PID PID Description
SSA SSA SHIFT SOLENOID A COMMANDED ON/OFF
SSB SSB SHIFT SOLENOID B COMMANDED ON/OFF
EPC EPC PRESSURE CONTROL A COMMANDED PRESSURE (PSI)
SSC SSC SHIFT SOLENOID C COMMANDED DUTY CYCLE (%)
SSD SSD SHIFT SOLENOID D COMMANDED DUTY CYCLE (%)
SSE SSE SHIFT SOLENOID E COMMANDED DUTY CYCLE (%)
GEAR GEAR COMMANDED TRANS GEAR (USE IN DRIVE)
GEAR OSCGEAR GEAR COMMANDED CONTROL STATUS REQUESTED BY OSC: PCM = Scheduled by PCM, OSC not in control 1 = 1st gear commanded by OSC 2 = 2nd gear commanded by OSC 3 = 3rd gear commanded by OSC 4 = 4th gear commanded by OSC
TCC TCC TORQUE CONVERTER COMMANDED DUTY CYCLE
TCC OSCTCC TORQUE CONVERTER CONTROL STATUS REQUESTED BY OSC: PCM = Scheduled by PCM, OSC not in control OFF = TCC commanded OFF by OSC ON = TCC commanded ON by OSC
FIRM_SFT FIRMSFT FIRM SHIFT CONTROL STATUS REQUESTED BY OSC: OFF = FIRM SHIFT MODE not commanded by OSC ON = FIRM SHIFT MODE commanded by OSC

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.

The following general PID list may be of use to the technician when exercising OSC:

PIDs PID DESCRIPTION
BPP BRAKE PEDAL POS/BRAKE SWITCH ON/OFF
GEARTOP HIGHEST GEAR PERMITTED
RPM ENGINE REVOLUTIONS PER MINUTE
TR TRANSMISSION RANGE SENSOR (PRESENT POSITION)
TCCRAT TORQUE CONVERTER SPEED RATIO (RPM/TSS)
TFT TRANSMISSION FLUID TEMPERATURE (DEGREES F)
VSS VEHICLE SPEED (MPH)