OSC - Transmission Bench Modes

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

SSA, SSR and TCC in BENCH MODE
The BENCH MODE allows the technician to carry out electrical circuit checks on the following components:
- SSA - activates SSA OFF or ON.
- SSB - activates SSB OFF or ON.
- Transmission converter clutch (TCC) - activates TCC OFF or ON.
OSC "SSA, SSB, TCC" BENCH MODE operates ONLY when:
- the digital TR sensor is operational and no digital TR sensor DTCs are present.
- the vehicle speed input is operational and no VSS sensor DTCs are present.
- the transmission range selector lever is in P.
- the key is ON.
- the engine is 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 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 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 electronic pressure control (EPC) solenoid can ramp up/down in increments of 103 kPa (15 psi) from zero to 620 kPa (90 psi) and 620 kPa (90 psi) to zero 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 00 kPa (00 psi).
- sets EPC pressure to 103 kPa (15 psi).
- sets EPC pressure to 206 kPa (30 psi).
- sets EPC pressure to 310 kPa (45 psi).
- sets EPC pressure to 411 kPa (60 psi).
- sets EPC pressure to 517 kPa (75 psi).
- sets EPC pressure to 620 kPa (90 psi).
To carry out an EPC BENCH MODE pressure functionality test, install a pressure gauge in the EPC port. The following requirements are required to carry out this test:
- VSS and digital TR sensor operational
- No VSS and digital TR sensor DTCs
- Transmission range selector lever in P
- Key ON
- Engine ON
- Engine speed at least 1,500 rpm for accurate EPC pressure measurement
To carry out an EPC BENCH MODE solenoid circuit pinpoint test, the following requirements are required.
- VSS and digital TR sensor operational
- No VSS and digital TR sensor DTCs
- Transmission range selector lever in P
- Key ON
- Engine OFF
OSC Command Values
- sets EPC pressure to 00 kPa (00 psi).
- sets EPC pressure to 103 kPa (15 psi).
- sets EPC pressure to 206 kPa (30 psi).
- sets EPC pressure to 310 kPa (45 psi).
- sets EPC pressure to 411 kPa (60 psi).
- sets EPC pressure to 517 kPa (75 psi).
- sets EPC pressure to 620 kPa (90 psi).
- cancels OSC value sent.
- sends the values to PCM.

BENCH MODE Procedure for EPC
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 - EPC.
- Select Value "0-620 kPa (0-90 psi)."
- Press "SEND" to send command.
- Select "XXX" to cancel at any time.
- Press "SEND."