Output State Control (OSC) Mode

Output State Control (OSC) Mode
Output State Control (OSC)
Output state control (OSC) allows the technician to control certain transmission function parameters. For example, OSC allows the technician to shift the transmission only when commanding 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 of the OSC features is that a technician can command a shift solenoid to turn ON or OFF when performing an electrical circuit check.

The OSC has 2 modes of operation for transmission: Bench and Drive. Each mode has a unique set of operating requirements that the technician must meet before being allowed to operate OSC.

NOTE: To operate OSC, the digital transmission range (TR) sensor and the vehicle speed sensor (VSS) must be operational. No diagnostic trouble codes (DTC's) related to the digital TR sensor or the VSS can be present.

Some of the operating requirements for using OSC are:

- The vehicle requirements MUST BE MET when SENDING the OSC value. Refer to the vehicle requirements for each test.
- 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 the sent value is substituted, the vehicle requirements are no longer met, the PCM will cancel the OSC value and resume normal operation. No error message will be sent.
- The OSC value may be sent anytime to cancel OSC.

Output State Control (OSC) Procedures
Procedures to use OSC are:
- Carry out a visual inspection and prepare the vehicle as necessary.
- Select the "Vehicle and Engine Selection" menu.
- Select the appropriate vehicle and engine.
- Select "Diagnostic Data Link".
- Select "Powertrain Control Module".
- Select "Diagnostic Test Mode".
- Select "KOEO On-Demand Self Test and KOER On-Demand Self Tests".
- Carry out the tests and record DTC's.
- Repair all non-transmission DTC's.
- Repair all VSS and digital TR sensor DTC's.
- Make sure that the VSS/digital TR sensors are functional.
- Select "Active Command Modes".
- Select "Output State Control".
- Select "Trans-Bench Mode" or "Trans-Drive Mode".

OSC - Transaxle Bench Modes
OSC provides the following Bench Mode selections:
- SSA, SSB, SSC, SSD, SSE and TCC
- PC A

SSA, SSB, SSC, SSD, SSE and TCC in Bench Mode

CAUTION: The parking brake must be set prior to carrying out this procedure.

The Bench Mode allows the technician to perform electrical circuit checks for the following components:
- SSA: activates SSA OFF or ON.
- SSB: activates SSB OFF or ON.
- SSC: activates SSC OFF or ON.
- SSD: activates SSD OFF or ON.
- SSE: activates SSE OFF or ON.
- TCC: activates TCC OFF or ON.

Bench Mode for SSA, SSB, SSC, SSD, SSE and TCC operates only when:
- VSS and digital TR sensor are operational.
- No VSS and digital TR sensor DTC's are set.
- Transmission shifter is in the P or N position.
- Key is ON.
- Engine is OFF.

The OSC command values are:
- OFF - turns solenoid OFF.
- ON - turns solenoid ON.
- XXX - cancels OSC sent value.
- SEND - sends the values to PCM.

Bench Mode Procedures for SSA, SSB, SSC, SSD, SSE and TCC
Follow operating instructions from the scan tool menu screen:
- Select "Output State Control."
- Select "Trans-Bench Mode."
- Select "PID's" to be monitored.
- Monitor all selected PID's during test.
- Select "Parameters - SSA, SSB, SSC, SSD, SSE or TCC."
- Select "ON" to turn solenoid ON.
- Press "SEND" to send command.
- Select "OFF" to turn solenoid OFF.
- Press "SEND" to send the OFF command.
- Select "XXX" to cancel at any time.
- Press "SEND."

PC A in Bench Mode

CAUTION: The parking brake must be set prior to carrying out this procedure.

The Bench Mode is used to test the functionality of the transmission electronic pressure control. During Bench Mode, the PC A solenoids can be commanded in increments of 15 psi from 0 to 90 psi and from 90 to 0 psi. The line pressure tap is used to verify output pressure from PC A and PC B by turning either one OFF while verifying the output from the other solenoid. The second pressure tap is used to verify the output from the PC C solenoid.

The OSC functions for the parameter PC A allow the technician to choose from the following options:
- PC A - activates PC A to selected values.
- 00 - sets PC A pressure to 00 psi.
- 15 - sets PC A pressure to 15 psi.
- 30 - sets PC A pressure to 30 psi.
- 45 - sets PC A pressure to 45 psi.
- 60 - sets PC A pressure to 60 psi.
- 75 - sets PC A pressure to 75 psi.
- 90 - sets PC A pressure to 90 psi.

The PC A Bench Mode should only be operated to check PRESSURE FUNCTIONALITY using an installed pressure gauge (300 psi)when:
- VSS and digital TR sensor are operational.
- No VSS and digital TR sensor DTC's are set.
- Transmission shifter is in the P or N position.
- Key is ON.
- Engine is running above 1,500 rpm.

The PC A Bench Mode should only be operated to complete PC A SOLENOID CIRCUIT PINPOINT TESTS when:
- VSS and digital TR sensor are operational.
- No VSS and digital TR sensor DTC's are set.
- Transmission shifter is in the P or N position.
- Key is ON.
- Engine is running above 1,500 rpm.

The OSC command values are:
- 00 - sets PC A pressure to 00 psi.
- 15 - sets PC A pressure to 15 psi.
- 30 - sets PC A pressure to 30 psi.
- 45 - sets PC A pressure to 45 psi.
- 60 - sets PC A pressure to 60 psi.
- 75 - sets PC A pressure to 75 psi.
- 90 - sets PC A pressure to 90 psi.
- XXX - cancels any value sent to the PCM.
- SEND - sends a value to the PCM.

Bench Mode for PC A
Follow operating instructions from the scan tool menu screen:
- Select "Output State Control."
- Select "Trans-Bench Mode."
- Select "PID's" to be monitored.
- Monitor all selected PID's during tests.
- Select "Parameters - PC A"
- Select value "0-90 psi."
- Press "SEND" to send the command.
- Select "XXX" to cancel at any time.
- Press "SEND"

OSC - Transmission Drive Mode
OSC provides the following Drive Mode functions:
- GEAR - allows upshifts and downshifts.
- TCC - engages or disengages the torque converter clutch (TCC).
- FIRM SHIFT - commands a higher control pressure during upshifts.

When using Drive Mode, the recommended procedure is to use one selection at a time. The pressure control (PC A) solenoids for this transmission are not directly controlled during Drive Mode testing. Pressures may be raised during an upshift via the FIRM SHIFT selection.

GEAR in Drive Mode
The Drive Mode allows the technician to choose the following options:
- 1 - PCM selects 1st gear.
- 2 - PCM selects 2nd gear.
- 3 - PCM selects 3rd gear.
- 4 - PCM selects 4th gear.
- 5 - PCM selects 5th gear.

Drive Mode for GEAR operates only when:
- VSS and digital TR sensor are operational.
- No VSS and digital TR sensor DTC's set.
- Engine ON.
- TCC is OFF (TCC cannot be engaged).
- Transmission shifter is in (D) or D5.
- Vehicle speed is above 3 km/h (2 mph).

OSC Command Values:
- 1 - PCM selects 1st gear.
- 2 - PCM selects 2nd gear.
- 3 - PCM selects 3rd gear.
- 4 - PCM selects 4th gear.
- 5 - PCM selects 5th gear.
- XXX - cancels OSC sent value.
- SEND - sends the values to PCM.

Drive Mode Procedure or GEAR
Follow operating instructions from the scan tool menu screen:
- Select "Output State Control."
- Select "Trans - Drive Mode."
- Select "PID's" to be monitored.
- Monitor all selected PID's during tests.
- Select "Parameters - GEAR."
- Select value "1-5."
- Press "SEND" to send the command.
- Select "XXX" to cancel at any time.
- Press "SEND."

TCC in Drive Mode
The Drive Mode allows the technician to choose the following options:
- TCC - activates TCC OFF and ON.
- ON - turns TCC ON.
- OFF - turns TCC OFF.

Drive Mode for TCC OFF operates only when:
- VSS and digital TR sensor are operational.
- No VSS and digital TR sensor DTC's are set.
- Engine is ON.
- Transmission shifter is in (D).
- Vehicle speed is above 32 km/h (20 mph).

Drive Mode for "TCC ON" operates ONLY when:
- VSS and digital TR sensor are operational.
- No VSS and digital TR sensor DTC's are set.
- Engine is ON.
- Transmission shifter is in (D).
- Vehicle speed is above 32 km/h (20 mph).
- Transmission in 2nd gear or higher.
- TFT is between 33°C-153°C (60°F-275°F).
- Brake is not applied below 32 km/h (20 mph).
- Steady vehicle speed is maintained.

OSC Command Values
- OFF - Turns TCC OFF.
- ON - Turns TCC ON.
- XXX - Cancels OSC value sent.
- SEND - Sends the values to PCM.

Drive Mode Procedures for TCC
Follow operating instructions from the scan tool menu screen:
- Select "Output State Control."
- Select "Trans - Drive Mode."
- Select "PID's" to be monitored.
- Monitor all selected PID's during tests.
- Select "Parameters - TCC."
- Select "ON" to turn the TCC solenoid ON.
- Press "SEND" to send the ON command.
- Select "OFF" to turn the TCC solenoid OFF.
- Press "SEND" to send the OFF command.
- Select "XXX" to cancel at any time.
- Press "SEND."

FIRM SHIFT in Drive Mode
This OSC function is used to raise pressure during an upshift to determine whether the pressure control system is functioning correctly. Harsher shifts indicate that the pressure control system works at higher pressure.

The best test for isolating pressure control system problems is to check PC A, PC B and PC C in Bench Mode, using a hydraulic pressure gauge.

The Drive Mode allows the technician to choose the following options:
- FIRM SHIFT: activates the harsh shift channel.
- ON - sets control pressure higher for all upshifts (determined by the PCM).
- OFF - sets control pressure to normal for all upshifts (determined by the PCM).
- XXX - cancels the FIRM SHIFT function of OSC.

Drive Mode for FIRM SHIFT operates only when:
- VSS and digital TR sensor are operational.
- No VSS and digital TR sensor DTC's are set.
- Key is ON.
- Engine is ON.
- Transmission shifter is in (D) or D5.
- Vehicle speed is above 3 km/h (2 mph).
- TCC is OFF (TCC cannot be engaged).
- Pressure gauge is installed (optional).

The OSC command values are:
- ON - sets control pressure higher for all upshifts (determined by the PCM).
- OFF - sets control pressure to normal for all upshifts (determined by the PCM).
- XXX - cancels the FIRM SHIFT function of OSC.
- SEND - sends a value to the PCM.

Drive Mode for FIRM SHIFT uses the following operating instructions:
- Select "Output State Control."
- Select "Trans - Drive Mode."
- Select "PID's" to be monitored.
- Monitor all selected PID's during tests.
- Select "Parameters - FIRM SHIFT."
- Select "ON" to set control pressure higher for all upshifts.
- Press "SEND" to send the ON command.
- Select "OFF" to set control pressure to normal for all upshifts.
- Press "SEND" to send the OFF command.
- Select "XXX" to cancel at any time.
- Press "SEND."