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Home >> Lincoln >> 1999 >> Town Car V8-4.6L SOHC VIN W >> Repair and Diagnosis >> Powertrain Management >> Transmission Control Systems >> Testing and Inspection >> Scan Tool Testing and Procedures >> Special Tools >> EPC In Drive Mode
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EPC In Drive Mode

This OSC functions is used to increase the EPC pressure while testing the transmission shift functions. This OSC functions can only increase the EPC pressure greater than what the PCM normally commands. If an OSC value, such as [75] or [90] PSI is sent, the upshifts and downshifts 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 kPa (00 PSI).
- [15] - sets EPC pressure to 103 kPa (15 PSI).
- [30] - sets EPC pressure to 206 kPa (30 PSI).
- [45] - sets EPC pressure to 310 kPa (45 PSI).
- [60] - sets EPC pressure to 411 kPa (60 PSI).
- [75] - sets EPC pressure to 517 kPa (75 PSI).
- [90] - sets EPC pressure to 620 kPa (90 PSI).

OSC "EPC" DRIVE MODE Operates ONLY when:
- anti-lock brake speed sensor and digital TR sensor are operational.
- No anti-lock brake speed sensor 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 kPa (00 PSI).
- [15] - sets EPC pressure to 103 kPa (15 PSI).
- [30] - sets EPC pressure to 206 kPa (30 PSI).
- [45] - sets EPC pressure to 310 kPa (45 PSI).
- [60] - sets EPC pressure to 411 kPa (60 PSI).
- [75] - sets EPC pressure to 517 kPa (75 PSI).
- [90] - sets EPC pressure to 620 kPa (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 "0-620 kPa (0-90 psi)."
- Press "SEND" to send command.
- Re-Select Value "0-620 kPa (0-90 psi)."
- Press "SEND" to send command.
- Select "XXX" to cancel at any time.
- Press "SEND."
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