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4WD SYSTEM DLN-15 < FUNCTION DIAGNOSIS > [ATX14B] C E F G H I J K L M A B DLN N O P TRANSFER FLUID TEMPERATURE SENSOR The transfer fluid temperature sensor detects the transfer fluid temperature and sends a signal to the transfer control unit. TRANSFER MOTOR • The transfer motor drives the sub-oil pump to provide proper lubrication and oil pressure control when the vehicle is at standstill, during low-speed operations or is being driven in reverse. • The main oil pump is operated by the driving force of the mainshaft. In other words, sufficient oil pressure buildup does not occur when the vehicle is at standstill or during low-speed operations. While the vehicle is being driven in reverse, the main oil pump rotates in the reverse direction. Therefore the main oil pump does not discharge oil pressure. During any of the above vehicle operations, the transfer motor drives the sub-oil pump to compensate for insufficient oil pressure. • The transfer motor operates as follows: - The motor relay turns OFF in the 2WD mode. - The motor relay operates as described in the table below in modes other than the 2WD mode. • 4WD shift switch, transmission range switch, Neutral-4LO switch, vehicle speed sensor and throttle position sensor are used in conjunction with the transfer motor. Transfer Motor Relay Operation *: After 2.5 seconds have elapsed. CLUTCH PRESSURE SOLENOID VALVE The clutch pressure solenoid valve distributes front and rear torque in AUTO mode. 2-4WD SHIFT SOLENOID VALVE The 2-4WD shift solenoid valve operates to apply oil pressure to the wet-multiplate clutch, depending on the drive mode. The driving force is transmitted to the front wheels through the clutch so the vehicle is set in the 4WD mode. Setting the vehicle in the 2WD mode requires no pressure buildup. In other words, pressure force applied to the wet-multiplate clutch becomes zero. TRANSFER CONTROL DEVICE Integrates actuator motor and actuator position switch. 4WD shift switch A/T selector lever position Vehicle speed (VSS) Accelerator pedal position Motor relay drive command 2WD — — — OFF 4H (LOCK) and 4LO N position 0 — ON P position 0 0 - 0.07/8 OFF* 0.07/8 - 1/8 HOLD 1/8 - MAX ON Other than R position 0 < VSS ≤ 50 km/h (31 MPH) — ON 50 km/h (31 MPH) < VSS < 55 km/h (34 MPH) HOLD 55 km/h (34 MPH) ≤ VSS OFF R position — — ON R position — — ON AUTO P or N position 0 0 - 0.07/8 OFF* 0.07/8 - 1/8 HOLD 1/8 - MAX ON 0 < VSS ≤ 50 km/h (31 MPH) — ON 50 km/h (31 MPH) < VSS < 55 km/h (34 MPH) HOLD 55 km/h (34 MPH) ≤ VSS OFF Other than R, P and N posi- 0 < VSS ≤ 50 km/h (31 MPH) — ON 50 km/h (31 MPH) < VSS < 55 km/h (34 MPH) HOLD 55 km/h (34 MPH) ≤ VSS OFF |