Test L: The Vehicle Does Not Shift Between 4H and 4L Modes Correctly

Test L: The Vehicle Does Not Shift Between 4H And 4L Modes Correctly

CAUTION: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multimeter probes.

L1-L3:

Normal Operation
The high-low shift occurs when the reduction shift fork moves the high-low collar to lock the planetary gear set to the output shaft. The torque transmitted through the sun gear from the input shaft turns the front planetary gear set assembly. The front planetary gear set assembly, now engaged, provides transfer case speed reduction. Certain criteria, such as vehicle speed and transmission range selection, must be met before this shift can occur.

Possible Causes
^ Transmission neutral switch (or clutch pedal position [CPP] switch) - hardwired to the 4WD control module
^ Brake ON/OFF (BOO) switch - hardwired to the 4WD control module
^ ABS vehicle speed inputs - hardwired to the 4WD control module