5D2-22 TRANSFER CASE - TOD A command to shift will only be acted upon if the TOD is reading a valid code at the time the command to shift is made. After a shift has started, the TOD will power the shift motor until the code for the requested position is read. If an invalid code is read, the TOD will go into a default mode. During a shift attempt, the shift motor will be energized for a maximum of 5 seconds. Indicator function on shifting Once a range change has been initiated the 4L Indicator will begin to blink at a rate of 0.3 seconds on, 0.3 seconds off until the shift is completed or canceled.
Electric Shift System Operation The Electric Shift System is responsible for changing the Transfer Case gear ratio by controlling the electric shift motor. The TOD monitors the 4H/4L switch, neutral switch, speed sensors, position encoder, and ignition switch. A range change is initiated when ; 1. The 4H/4L Switch is changed from 4H to 4L or from 4L to 4H. 2. The motor position (as indicated by the position encoder) does not match the 4H/4L Switch immediately after the ignition is turned on. Shift criteria When a range change is initiated a Diagnostic Test will be completed on the motor, speed sensors, and position encoder. If the Diagnostic Test fails, the shift will not be attempted.
If all components are operating properly, the TOD will attempt a range change after the following shift criteria are met: 1. The transmission is in neutral for 2 seconds after the shift is requested. 2. Both propeller shaft speeds are below 87 rpm (2580 pulses/minute). If the transmission is taken out of neutral before 2 seconds has elapsed, or either propeller shaft speed increases above the limit, the shift will be suspended and the 4L Indicator will continue to blink until the criteria are met again or the 4H/4L Switch is returned to the original position.
YAD5D140 If a successful shift has been completed, the 4L Indicator will be illuminated if the motor is in Low and it will be turned off if the motor is in High. 4L Indicator illuminates as below figure. Electric shift default mode If the motor fails to reach its destination, the TOD will attempt the following (in order): 1. The TOD will wait 3 seconds then attempt the shift again. 2. If the second attempt to reach the destination fails the TOD will wait 3 seconds then attempt to rotate the motor back to the original position. If successful, all future shifts will be inhibited until the Ignition is cycled. 3.
If the attempt to return to the original position fails, the TOD will wait 3 seconds then attempt to rotate the motor to the original position again. If the second attempt to return to the original position is successful, the 4WD CHECK lamp will be illuminated, and all future shifts will be inhibited until the Ignition is cycled. Range change When the shift criteria are met, the motor is rotated in the appropriate direction (as determined by the selector switch) until one of the following occurs: 1. The motor reaches its destination. 2. The motor is on for 5 seconds without reaching its destination. The shift has failed and the TOD will respond as default mode. 3.
A fault occurs with either the motor or position encoder. Refer to the diagnosis requirement. When the motor is energized, the Ignition, 4H/4L Switch, propeller shaft speeds, and transmission neutral inputs are ignored. SSANGYONG Y200