OSC-Transmission Bench Modes

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

SSA, SSB, SSC, SSD and TCC in BENCH MODE:
The BENCH MODE allows the technician to carry out electrical circuit checks on the following components:
- SSA - Activates SS#1 OFF or ON.
- SSB - Activates SS#2 OFF or ON.
- SSC - Activates SS#3 OFF or ON.
- SSD - Activates SS#4 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.
- Key ON.
- Engine OFF.

OSC Command Values
- turns solenoid OFF.
- turns solenoid ON.
- cancels OSC value sent.
- 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."

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 0 to 90 psi and 90 to 0 psi.
The OSC functions for the parameter EPC allows the technician to choose the following options:
- EPC - Activates EPC to selected values.
- sets EPC pressure to 0 psi.
- sets EPC pressure to 15 psi.
- sets EPC pressure to 30 psi.
- sets EPC pressure to 45 psi.
- sets EPC pressure to 60 psi.
- sets EPC pressure to 75 psi.
- sets EPC pressure to 90 psi.
OSC "EPC" - 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.
- Pressure gauge installed.
- Key ON.
- Engine ON.
- Engine rpm at 1,500.
OSC "EPC" - BENCH MODE should ONLY be operated to complete EPC

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 "P" or "N".
- Key "ON".
- Engine "OFF".

OSC Command Values
- sets EPC pressure to 0 psi.
- sets EPC pressure to 15 psi.
- sets EPC pressure to 30 psi.
- sets EPC pressure to 45 psi.
- sets EPC pressure to 60 psi.
- sets EPC pressure to 75 psi.
- sets EPC pressure to 90 psi.
- turns solenoid OFF.
- turns solenoid ON, cancels OSC value sent.
- sends the values to PCM.

BENCH MODE Procedure for EPC
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 -EPC."
- Select Value "0 - 90 psi."
- Press "SEND" to send command.
- Select "XXX" to cancel at any time.
- Press "SEND."