NMC-WOLLARD MB-4 200-DF - Disconnect Only; Four Wheel Drive will Not Disengage; Four Wheel Drive will Not Engage; Internal Disconnect Only

Test and Troubleshooting
100
17
DPSG,YZ07927,105 –19–22JUN99–1/1
FOUR WHEEL DRIVE WILL NOT ENGAGE
INTERNAL DISCONNECT ONLY
Symptom Problem
Solution
Four wheel drive will not engage. Solenoid stuck open. Repair or replace solenoid. Check
wiring diagram and connectors.
Damaged or missing spring. Replace or install spring.
Bleed port blocked. Check for proper installation of
gasket and solenoid cap or
contamination.
The transmission is programed to Contact vehicle manufacture.
default too “two wheel drive” if
electrical power is lost to the
transmission.
DPSG,YZ07927,106 –19–22JUN99–1/1
FOUR WHEEL DRIVE WILL NOT DISENGAGE
INTERNAL DISCONNECT ONLY
Symptom Problem
Solution
Four wheel drive will not No power to solenoid, solenoid Check for electric power to solenoid,
disengage. inoperative. check wiring and connectors, replace
solenoid.
Check valve gasket installed Install check valve properly.
backwards.
Piston seal damaged or installed Replace seal or install properly.
backwards.
The transmission is programed to Contact vehicle manufacture.
default too “four wheel drive” if
electrical power is lost to the
transmission.
CTM195 (28JUL99) 100-17 2000 Series Transmission
072899
PN=55