TM-9-2320-280-20 HMMWV Technical Manual Unit Maintenance Volume 1 Download
Page 530 of 890
TM 9-2320-280-20-1 TRANSMISSION SYSTEM (4L80-E) DTC 81 2-3 Shift Solenoid Circuit Fault Circuit Description: Ignition voltage is supplied directly to the 2-3 shift solenoid. The TCM controls the solenoid by providing the ground path through CKT 315A to TCM. DTC 81 Will Set When: ● The TCM commands the solenoid “ON” and voltage remains high. c The TCM commands the solenoid “OFF” and voltage remains low. . All conditions are met for 2 seconds. DTC 82 1-2 Shift Solenoid Fault Circuit Description: Ignition voltage is supplied directly to the 1-2 shift solenoid. The TCM controls the solenoid by providing the ground path through CKT 237A to TCM. DTC 82 Will Set When: ● The TCM commands the solenoid “ON” and voltage remains high. ● The TCM commands the solenoid “OFF” and voltage remains low. ● All conditions are met for 2 seconds. REFERENCE INFORMATION DTC 83 TCC Solenoid (PWM) Circuit Fault Circuit Description: The control module supplies a ground through an internal Quad-Driver Module (QDM) allowing current to flow through the solenoid coil according to the duty cycle (percentage of “ON” and “OFF” time). This current flow through the solenoid coil creates a magnetic field that magnetizes the solenoid core. The magnetized core attracts the check-ball to seat against spring pressure. This blocks the exhaust for the TCC signal fluid and allows 2-3 drive fluid to feed the TCC signal circuit. The TCC signal fluid pressure acts on the TCC regulator valve to regulate line pressure and to apply fluid pressure to the TCC shift valve. When the TCC shift valve is in the “apply” position, regulated apply fluid pressure is directed through the TCC valve to apply the torque converter clutch. DTC 83 Will Set When: ● ● ● The TCM commands the solenoid “ON” and voltage remains high. The TCM commands the solenoid “OFF” and voltage remains low. AU conditions are met for 2 seconds. 2-426