5R55S - Automatic Transaxle/Transmission
Output State Control (OSC) ModeOutput state control (OSC) mode 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 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 carrying out an electrical circuit check. OSC has 2 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 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 DTCs related to the digital TR sensor or the VSS can be present.
^ The vehicle requirements MUST BE MET when SENDING the OSC value. Refer to vehicle requirements for each individual 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 a sent value is substituted and 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 XXX may be sent anytime to cancel OSC.
OSC Procedures
^ Carry out visual inspection and vehicle preparation as necessary.
^ Select "Vehicle and Engine Selection" menu.
^ Select 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 test and record DTCs.
^ Repair all non-Transmission DTCs.
^ Repair all VSS and digital TR sensor DTCs.
^ Make sure that VSS/digital TR sensors are functional.
^ Select "Active Command Modes".
^ Select "Output State Control".
^ Select "Trans - Bench Mode or Trans - Drive Mode".
OSC - Transmission Bench Modes
The following transmission Bench Modes may be used as necessary during diagnostics.
SSA, SSB, SSC, SSD and TCC in Bench Mode
WARNING: Block all wheels, set the parking brake and firmly apply the service brake to reduce the risk of vehicle movement during this procedure. Failure to follow these instructions may result in serious personal injury.
The Bench Mode allows the technician to carry out electrical circuit checks on the following components:
^ SSA - Activates SS A OFF or ON
^ SSB - Activates SS B OFF or ON
^ SSC - Activates SS C OFF or ON
^ SSD - Activates SS D OFF or ON
^ TCC - Activates TCC OFF or ON
OSC "SSA, SSB, SSC, SSD, TCC" Bench Mode operates ONLY when:
^ VSS and digital TR sensor are operational.
^ No VSS and digital TR sensor DTCs.
^ Transmission range selector lever in P or N.
^ Key ON.
^ Engine OFF.
OSC Command Values:
^ OFF - Turns solenoid OFF.
^ ON - Turns solenoid ON.
^ XXX - Cancels OSC value sent.
^ SEND - Sends the values to PCM.
Bench Mode Procedure for SSA, SSB, SSC, SSD and TCC
Follow operating instructions from the scan tool menu screen:
^ Select "Output State Control".
^ Select "Trans - Bench Mode".
^ Select "PIDs" to be monitored.
^ Monitor all selected PIDs during test.
^ Select "Parameters - SSA, SSB, SSC, SSD or TCC".
^ Select "ON" to turn solenoid ON.
^ Press "SEND" to send command ON.
^ Select "OFF" to turn solenoid OFF.
^ Press "SEND" to send command OFF.
^ Select "XXX" to cancel at any time.
^ Press "SEND".
PCA, PCB, PCC in Bench Mode
WARNING: Block all wheels, set the parking brake and firmly apply the service brake to reduce the risk of vehicle movement during this procedure. Failure to follow these instructions may result in serious personal injury.
The Bench Mode is also used to test the functionality of the transmission electronic pressure control. During Bench Mode, the PCx solenoids can be commanded in increments of 15 psi from 0 to 90 psi and 90 to 0 psi.
The line pressure tap is used to verify output pressure from PC A or 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 PCx allows the technician to choose the following options:
^ PCx - Activates PCx to selected values.
^ 00 - Sets PCx pressure to 00 psi.
^ 15 - Sets PCx pressure to 15 psi.
^ 30 - Sets PCx pressure to 30 psi.
^ 45 - Sets PCx pressure to 45 psi.
^ 60 - Sets PCx pressure to 60 psi.
^ 75 - Sets PCx pressure to 75 psi.
^ 90 - Sets PCx pressure to 90 psi.
OSC "PCx" 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 DTCs.
^ Transmission range selector lever in P or N.
^ Pressure gauge installed.
^ Key ON.
^ Engine ON.
^ Engine rpm at least 1500.
OSC "PCx" Bench Mode should ONLY be operated to complete PCx SOLENOID CIRCUIT PINPOINT TESTS when:
^ VSS and digital TR sensor are operational.
^ No VSS and digital TR sensor DTCs are present.
^ Transmission range selector lever is in P or N.
^ Key "ON".
^ Engine "OFF".
OSC Command Values:
^ 00 - Sets PCx pressure to 00 psi.
^ 15 - Sets PCx pressure to 15 psi.
^ 30 - Sets PCx pressure to 30 psi.
^ 45 - Sets PCx pressure to 45 psi.
^ 60 - Sets PCx pressure to 60 psi.
^ 75 - Sets PCx pressure to 75 psi.
^ 90 - Sets PCx pressure to 90 psi.
^ XXX - cancels OSC value sent.
^ SEND - sends the values to PCM.
Bench Mode Procedure for PCx
Following operating instructions from the scan tool menu screen:
^ Select "Output State Control".
^ Select "Trans - Bench Mode".
^ Select "PIDs" to be monitored.
^ Monitor all selected PIDs during test.
^ Select "Parameters - PCx".
^ Select Value "0 - 90 psi".
^ Press "SEND" to send command.
^ Select "XXX" to cancel at any time.
^ Press "SEND".
OSC - Transmission Drive Modes
The Drive Mode allows control of 3 transmission parameters. Each mode/parameter has a unique set of vehicle operating requirements that the technician must meet before being allowed to operate OSC. The recommended procedure, when using the Drive Mode, is to control one parameter at a time.
The Drive Mode allows the technician to carry out the following functions on the transmission:
^ GEAR - Allows upshifts or downshifts.
^ TCC - Engages or disengages the torque converter clutch.
^ FIRM_SFT - Commands a higher control pressure during upshift.
The pressure control (PCx) solenoids for this transmission are not directly controlled during Drive Mode testing. Pressures may be raised during an upshift via the harsh shift control channel (FIRM_SFT).
GEAR in Drive Mode
This OSC function is used to test the transmission shift functions.
The OSC functions for the GEAR parameter allow 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.
OSC "GEAR" mode operates ONLY when:
^ VSS and digital TR sensor are operational.
^ No VSS and digital TR sensor DTCs.
^ Engine ON.
^ TCC OFF (TCC cannot be engaged).
^ Transmission range selector lever in (D).
^ Vehicle speed is greater than 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 value sent.
^ SEND - Sends the values to PCM.
Drive Mode Procedure for GEAR
Follow operating instructions from the scan tool menu screen.
^ Select "Output State Control".
^ Select "Trans - Drive Mode".
^ Select "PIDs" to be monitored.
^ Monitor all selected PIDs during test.
^ Select "Parameters - GEAR".
^ Select Value "1-5".
^ Press "SEND" to send command.
^ Reselect Value "1-5".
^ Press "SEND" to send command.
^ Select "XXX" to cancel at any time.
^ Press "SEND".
TCC in Drive Mode
This OSC function is used to test whether the torque converter clutch (TCC) is engaging and disengaging correctly.
The OSC functions for the TCC parameter allows the technician to choose the following:
^ TCC - Activates TCC OFF and ON.
^ ON - Turns TCC solenoid ON.
^ OFF - Turns TCC solenoid OFF.
OSC "TCC OFF" Drive Mode operates ONLY when:
^ VSS and digital TR sensors are operational.
^ No VSS and digital TR sensor DTCs present.
^ Engine ON.
^ Transmission range selector lever in (D).
^ Vehicle speed is greater than 3 km/h (2 mph).
OSC "TCC ON" Drive Mode operates ONLY when:
^ VSS and digital TR sensors are operational.
^ No VSS and digital TR sensor DTCs present.
^ Engine ON.
^ Transmission range selector lever in (D).
^ Vehicle speed is greater than 3 km/h (2 mph).
^ Transmission in 2nd gear or higher.
^ TFT is between 33-153° C (60-275° F).
^ Brake not applied "OFF" below 32 km/h (20 mph).
^ Maintain steady speed.
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 "PIDs" to be monitored.
^ Monitor all selected PIDs during test.
^ Select "Parameters - TCC".
^ Select "ON" to turn solenoid ON.
^ Press "SEND" to send command ON.
^ Select "OFF" to turn solenoid OFF.
^ Press "SEND" to send command OFF.
^ Select "XXX" to cancel at any time.
^ Press "SEND".
FIRM_SFT 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 carry out the PCA, PCB, PCC in Bench Mode using a hydraulic pressure gauge.
The OSC functions for the parameter FIRM_SFT allows the technician to choose the following options:
^ FIRM SFT - 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 - Cancel OSC for FIRM SFT
OSC "FIRM_SFT" Drive Mode operates ONLY when:
^ VSS and digital TR sensor are operational.
^ No VSS and digital TR sensor DTCs.
^ Transmission range selector lever in O/D.
^ Pressure gauge installed (optional).
^ Key ON.
^ Engine ON.
^ Vehicle speed greater than 3 km/h (2 mph).
^ TCC is OFF (TCC is not engaged).
OSC Command Values:
^ ON - Sets control pressure high for all upshifts (determined by the PCM)
^ OFF- Sets control pressure to normal for all upshifts (determined by the PCM)
^ XXX - Cancel OSC for FIRM SFT
^ SEND - Sends the values to the PCM Drive Mode procedure for FIRM_SFT
Follow operating instructions from the scan tool menu screen.
^ Select "Output State Control".
^ Select "Trans - Drive Mode".
^ Select "PIDs" to be monitored.
^ Monitor all selected PIDs during test.
^ Select "Parameters - FIRM SFT.
^ Press "SEND" to send command.
^ Select "XXX" to cancel at any time.
^ Press "SEND".