Ford 2003 Mustang Workshop Manual page 2321

SECTION 307-01: Automatic Transaxle/Transmission
DIAGNOSIS AND TESTING
Output State Control (OSC) Mode
Output State Control (OSC) allows the technician to take control of certain parameters to function the
transmission. For example, OSC allows the technician to shift the transmission only when he/she
commands a gear change. If the technician commands 1st gear in OSC, the transmission will remain
in 1st gear until the technician commands the next gear. Another example, the technician can
command a shift solenoid to turn on or off when carrying out an electrical circuit check. OSC has two
modes of operation for transmission, the BENCH MODE and the DRIVE MODE. Each
mode/parameter has a unique set of vehicle operating requirements that the technician is required to
meet before being allowed to operate OSC.
NOTE: To operate OSC the digital transmission range (TR) sensor must be operational. No Diagnostic
Trouble Codes (DTCs) related to the digital TR sensor can be present.
To operate OSC the vehicle speed source must be operational. No diagnostic codes (DTCs) related to
this source can be present. The vehicle speed source can vary depending on vehicle configuration.
Technicians should verify which input source is applicable for their vehicle application. The following
are potential vehicle speed sources:
anti-lock braking system (ABS)
output shaft speed (OSS) sensor
vehicle speed sensor
The vehicle requirements MUST BE MET when SENDING the OSC value. Refer to individual
test modes for vehicle requirements.
If the vehicle requirements are NOT MET when SENDING the OSC value, an ERROR
MESSAGE will appear. When the ERROR MESSAGE is received, OSC is aborted and must be
restarted.
If AFTER SENDING an OSC value, and the vehicle requirements are no longer met, the PCM
will cancel the OSC value and NO ERROR message will appear. Once the vehicle requirements
are met again, the PCM will automatically SEND the previous OSC value without any additional
actions required by the service technician.
The OSC value XXX may be sent anytime to cancel OSC.
Output State Control (OSC) Procedures
Carry out visual inspection and vehicle preparation as required.
Select "Vehicle and Engine Selection" menu.
Select appropriate vehicle and engine.
Select "Diagnostic Data Link."
Select "Powertrain Control Module."
Select "Output Test Mode."
Select "KOEO On-Demand Self Test and KOER On-Demand Self Tests."
Carry out test and record DTCs.
Repair all NON-Transmission DTCs.
Repair all digital TR Sensor DTCs.
2003 Mustang Workshop Manual