2005 MY OBD System Operation Summary for Gasoline Engines

! 4%:> );;The Analog Transmission Range (TR) sensor provides a single analog input to the PCM. The voltage correspondsto the driver-selected gear position (Park, Rev, Neutral, OD, 2, 1). This input is checked for opens and shorts.(P0707, P0708)The Turbine Shaft Speed (TSS) sensor and Output Shaft Speed (OSS) sensors are analog inputs that arechecked for rationality. If the engine rpm is above the torque converter stall speed and engine load is high, it can beinferred that the vehicle must be moving. If there is insufficient output from the TSS sensor, a malfunction isindicated (P0715). If there is insufficient output from the OSS sensor, a malfunction is indicated (P0720).;Shift SolenoidsThe Shift Solenoid (SSA and SSB) output circuits are checked for opens and shorts by the PCM by monitoring thestatus 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 ISIG test runs in conjunction with theother transmission functional tests. The lack of communication between the ISIG chip and the PCMmicroprocessor is also monitored (P1636).Torque Converter ClutchThe Torque Converter Clutch (TCC) output circuit is a duty-cycled output that is checked electrically for opens andshorts by the PCM by monitoring the status of a feedback circuit from the output driver (P0743).The PWM used to control CD4E's TCC does not have sufficient inductive signature, therefore on theseapplications the TCC solenoid is functionally tested by monitoring converter slip. If the TCC is failed on whencommanded off, a P1742 fault code will be stored. If the TCC is failed off when commanded on, a P0741 fault codewill be stored.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 108 OF 131