2005 MY OBD System Operation Summary for Gasoline Engines

4$=%$> );4R70E is the replacement for the 4R70W. The 4R70E transmission is essentially a 4R70W with a Turbine SpeedSensor (TSS);The Digital Transmission Range (DTR) sensor provides a single analog and three digital inputs to the PCM. ThePCM decodes the inputs to determine the driver-selected gear position (Park, Rev, Neutral, OD, 2, 1). This inputdevice is checked for opens and invalid input patterns. (P0708 P0705)The Vehicle Speed Sensor (VSS), Output Shaft Speed (OSS) sensor, and Turbine Speed Sensor (TSS) ifequipped, are inputs that are checked for rationality. If the engine rpm is above the torque converter stall speedand engine load is high, it can be inferred that the vehicle must be moving. If there is insufficient output from theVSS sensor, a malfunction is indicated (P0500). If there is insufficient output from the OSS sensor, a malfunctionis indicated (P0720). If there is insufficient output from the TSS sensor, a malfunction is indicated (P0715).;Shift SolenoidsThe Shift Solenoid (SSA and SSB) output circuits are checked for opens and shorts by the PCM by monitoringthe status of a feedback circuit from the output driver (P0750 SSA, P0755 SSB).All vehicle applications will utilize an inductive signature circuit to monitor the shift solenoids functionally. The ISIGcircuit monitors the current signature of the shift solenoid as the solenoid is commanded on. A solenoid thatfunctions properly will show a characteristic decrease in current as the solenoid starts to move. If the solenoid ismalfunctioning, the current will not change (P1714 SSA, P1715 SSB). The lack of communication between theISIG chip and the PCM microprocessor is also monitored (P1636).Torque Converter ClutchThe Torque Converter Clutch (TCC) output circuit is a duty-cycled output that is checked electrically for opensand shorts by the PCM by monitoring the status of a feedback circuit from the output driver (P0743).All vehicle applications will utilize an inductive signature circuit to monitor the torque converter clutch. The ISIGcircuit monitors the current signature of the TCC solenoid as the solenoid is commanded on. A solenoid thatfunctions properly will show a characteristic decrease in current as the solenoid starts to move. If the solenoid ismalfunctioning, the current will not change (P1740). In some applications, the ISIG test is run in conjunction withthe other transmission functional tests. The lack of communication between the ISIG chip and the PCMmicroprocessor is also monitored (P1636).Electronic Pressure ControlThe EPC solenoid is a variable force solenoid that controls line pressure in the transmission. The EPC solenoidhas a feedback circuit in the PCM that monitors EPC current. If the current indicates a short to ground (lowpressure), engine torque may be reduced to prevent damage to the transmission. (P0962, PCA)FORD MOTOR COMPANY REVISION DATE: APRIL 28, 2004 PAGE 106 OF 131