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Home >> Mazda >> 1998 >> B2500 SE Cab Plus 2WD L4-2.5L VIN C >> Repair and Diagnosis >> Transmission and Drivetrain >> Automatic Transmission/Transaxle >> Testing and Inspection >> Component Tests and General Diagnostics >> 5R55E Output State Control (Osc) Mode >> Output State Control (Osc) Procedures
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Output State Control (Osc) Procedures

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 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. For another example, the technician can command a shift solenoid to turn on or off when performing 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 Sensor and the Vehicle Speed Sensor must be operational. No Diagnostic Trouble Codes (DTCs) related to the digital Transmission Range Sensor or the Vehicle Speed Sensor 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 SENDING an OSC value, and the vehicle requirements are no longer met, the PCM win cancel the OSC value and NO ERROR message will appear.
- The OSC value [XXX] may be sent anytime to cancel OSC.
- The OSC value [XXX] may be sent anytime to cancel OSC.

Output State Control (OSC) Procedures:
- Perform 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 "Diagnostic Test Mode."
- Select "KOEO On-Demand Self Test and KOER On-Demand Self Tests."
- Perform 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 "Trans-Bench Mode or Trans-Drive Mode."

5R55E OSC-Transmission Bench Modes
The following Transmission Bench Modes may be used or required during diagnostics.

SS1, SS2, SS3, SS4 and TCC in BENCH MODE:
The BENCH MODE allows the technician to perform electrical circuit checks on the following components:
- SS1-Activates SS1 OFF or ON.
- SS2-Activates SS2 OFF or ON.
- SS3- Activates SS3 OFF or ON.
- SS4- Activates SS4 OFF or ON.
- TCC-Activates TCC OFF or ON.
OSC "SS1,SS2,SS3,SS4, 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.
- Key ON.
- Key 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 SS1, SS2,SS3, S54, and TCC
Follow operating instructions from the NGS menu screen:
- Select "Output State Control."
- Select "Trans-Bench Mode."
- Select "PIDs" to be monitored.
- Monitor all selected PIDs during test.
- Select "parameters-SS1, 552, SS3,SS4, 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."

5R55E EPC in BENCH MODE
The BENCH MODE is also used to test the functionality of the transmission's electronic pressure control. During BENCH MODE, the EPC solenoid can ramp in increments of 15 PSI from zero to 90 PSI and 90 to zero PSI.
The OSC functions for the parameter EPC allows the technician to choose the following operations.
- EPC-Activates EPC to selected values.
- [00]-sets EPC pressure to 00 PSI.
- [15]-sets EPC pressure to 15 PSI.
- [30]-sets EPC pressure to 30 PSI.
- [45]-sets EPC pressure to 45 PSI.
- [60]-sets EPC pressure to 60 PSI.
- [75]-sets EPC pressure to 75 PSI.
- [90]-sets EPC pressure to 90 PSI.
OSC "EPC" 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.
- Pressure gauge installed.
- Key ON.
- Engine ON.
- Engine rpm at 1500.
OSC Command Values
- [00]-sets EPC pressure to 00 PSI.
- [15]-sets EPC pressure to 15 PSI.
- [30]-sets EPC pressure to 30 PSI.
- [45]-sets EPC pressure to 45 PSI.
- [60]-sets EPC pressure to 60 PSI.
- [75]-sets EPC pressure to 75 PSI.
- [90]-sets EPC pressure to 90 PSI.
- [OFF]-turns solenoid off.
- [ON]-turns solenoid on.
- [XXX]-cancels OSC value sent.
- [SEND]-sends the values to PCM.

5R55E BENCH MODE Procedure for EPC
Following operating instructions from the NGS menu screen.
- Select "Output State Control."
- Select "Trans-Bench Mode."
- Select "PIDs" to be monitored.
- Monitor all selected PIDs during test.
- Select "Parameters-EPC."
- Select Value "0-90 psi."
- Press "SEND" to send command.
- Select "XXX" to cancel at any time.
- Press "SEND."

5R55E OSC-Transmission DRIVE MODES
The DRIVE MODE allows control of three transmission parameters. Each mode/parameter has a unique set of vehicle operating requirements that the technician is required to 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 perform the following functions on the transmission:
- GR_CM-allows upshifts or downshifts.
- TCC-engages or disengages the torque converter clutch.
- EPC-increases/decreases EPC pressure.

5R55E GR_CM in DRIVE MODE
This OSC function is used to test the transmission shift functions.
The OSC functions for the GR_CM parameter 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.
OSC "GR CM" Mode Operates ONLY when:
- VSS and digital TR sensor are operational.
- No VSS and digital TR sensor DTCs.
- Engine "ON."
- TCC "OFF."
- Transmission range selector lever on O/D.
- Vehicle speed is greater than 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.
- [OFF]-turns solenoid off.
- [ON]-turns solenoid on.
- [XXX]-cancels OSC value sent.
- [SEND]-sends the values to PCM.

5RR5E DRIVE MODE Procedures for GR_CM
Following operating instructions from the NGS menu screen.
- Select "Output State Control."
- Select "Trans-DRIVE MODE."
- Select "PIDs" to be monitored.
- Monitor all selected PIDs during test.
- Select "Parameters-GR_CM."
- Select Value "1-5."
- Press "SEND" to send command.
- Re-Select Value "1-5."
- Press "SEND" to send command.
- Select "XXX" to cancel at any time.
- Press "SEND."

5R55E TCC in DRIVE MODE:
This OSC function is used to test whether the torque converter clutch 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 O/D.
- Vehicle speed is greater than 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 O/D.
- Vehicle speed is greater than 2 mph.
- Transmission in 2nd gear or higher.
- TFT is between 60 and 275°F.
- Brake not applied "OFF" below 20 mph.
- Not an excessive load on engine (engine lugging).
OSC Command Values
- [OFF]-turns TCC OFF
- [ON]-turns TCC ON.
- [XXX]-cancels OSC value sent.
- [SEND]-sends the values to PCM.

5R55E Drive Mode Procedures for TCC
Follow operating instructions from the NGS 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.
- Press "XXX" to cancel at any time.
- Press "SEND."

5R55E EPC in DRIVE MODE
This OSC function is used to increase the EPC pressure while testing the transmission shift functions. This OSC function can only increase the EPC pressure greater than what the PCM normally commands. If an OSC value, such at 75] or 90] PSI is sent, the upshifts and down- shifts should exhibit a harsher shift. Harsher shifts would indicate that the EPC pressure control works at higher pressures. The best test for the EPC is to use the BENCH MODE and a hydraulic pressure gauge. Using EPC in the BENCH MODE will confirm that the EPC works at both the higher and lower pressures.
The OSC functions for the parameter EPC allows the technician to choose the following options:
EPC-activates EPC to selected
- [00]-sets EPC pressure to 00 PSI.
- (15]-sets EPC pressure to 15 PSI.
- [30]-sets EPC pressure to 30 PSI.
- (45]-sets EPC pressure to 45 PSI.
- [60]-sets EPC pressure to 60 PSI.
- [75]-sets EPC pressure to 75 PSI.
- [90]-sets EPC pressure to 90 PSI.
OSC "EPC" 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.
- Key ON.
- Engine ON.
- Vehicle speed greater than 2 mph.
- OSC value for EPC must be greater than what the PCM commands (see EPC PID).
OSC Command Values
- [00]-sets EPC pressure to 00 PSI
- [15]-sets EPC pressure to 15 PSI.
- [30]-sets EPC pressure to 30 PSI.
- [45]-sets EPC pressure to 45 PSI.
- [60]-sets EPC pressure to 60 PSI.
- [75]-sets EPC pressure to 75 PSI.
- [90]-sets EPC pressure to 90 PSI.
- [OFF]-turns solenoid off.
- [ON]-turns solenoid on.
- [XXX]-cancels OSC value sent.
- [SEND]-sends the values to PCM.
DRIVE MODE Procedure for EPC.
Follow operating instructions from the NGS menu screen.
- Select "Output State Control."
- Select "Trans-Drive Mode."
- Select "PIDs" to be monitored.
- Monitor all selected PIDs during test.
- Select "Parameters-EPC."
- Select Value "0-90 psi."
- Press "SEND" to send command.
- Re-Select Value "0-90 psi."
- Press "SEND" to send command.
- Select "XXX" to cancel at any time.
- Press "SEND."

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