Jeep Grand Cherokee WK. Manual — part 1545
U0431–IMPLAUSIBLE DATA RECEIVED FROM FCM (FDCM)
For a complete wiring diagram Refer to Section 8W
•
When Monitored:
With the ignition on for 4 seconds, no CAN BUS circuit error condition present, no lost communication with
FCM condition present, and no system undervoltage or overvoltage condition present.
•
Set Condition:
The Final Drive Control Module is receiving no message or implausible data for Ambient Temperature from the
FCM.
Possible Causes
FRONT CONTROL MODULE DTCS PRESENT
FINAL DRIVE CONTROL MODULE
Diagnostic Test
1.
FRONT CONTROL MODULE DTCS PRESENT
Ignition on.
With the scan tool, select View DTCs in the Front Control Module.
Are there any DTCs present?
Yes
>> Refer to the symptom list and perform the applicable diagnostic procedure.
Perform the TRANSFER CASE VERIFICATION TEST-VER 1.
No
>> Replace the Final Drive Control Module in accordance with the Service Information.
Perform the TRANSFER CASE VERIFICATION TEST-VER 1.
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TRANSFER CASE - ELECTRICAL DIAGNOSTICS
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TRANSFER CASE - NV140 - SERVICE INFORMATION
TABLE OF CONTENTS
page
page
TRANSFER CASE - NV140 - SERVICE
INFORMATION
DESCRIPTION
. . . . . . . . . . . . . . . . . . . . . . . . 992
. . . . . . . . . . . . . . . . . . . . . . . . . . 993
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 993
. . . . . . . . . . . . . . . . . . . . . . . . 994
. . . . . . . . . . . . . . . . . . . . . . . . . . 1001
. . . . . . . . . . . . . . . . . . . . . . . 1009
. . . . . . . . . . . . . . . 1011
FLUID
STANDARD PROCEDURE - FLUID DRAIN/
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1012
SEAL-FRONT OUTPUT SHAFT
. . . . . . . . . . . . . . . . . . . . . . . . . . . 1012
SEAL-REAR OUTPUT SHAFT
. . . . . . . . . . . . . . . . . . . . . . . . . . . 1012
. . . . . . . . . . . . . . . . . . . . . . . 1013
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TRANSFER CASE - NV140 - SERVICE INFORMATION
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TRANSFER CASE - NV140 - SERVICE INFORMATION
DESCRIPTION
The NV140 is a single-speed transfer case and it is used in the Quadra- Trac I Full-Time 4-Wheel Drive System. It
provides full-time 4-wheel drive. The transfer case operates with an open center differential dividing engine torque
nearly evenly with 48 percent of engine torque to the front axle and 52 percent of engine torque to the rear axle.
The Brake Traction Control System, which combines standard ABS and Traction Control, provides resistance to any
wheel that is slipping to allow additional torque transfer to wheels with traction.
The Quadra-Trac I system with NV 140 single-speed transfer case provides the following benefits:
•
No shift lever or driver interaction required.
•
Full-time four-wheel drive provides smooth operation and vehicle stability under all conditions because torque
is constantly being transferred.
•
Even torque distribution provides traction to maintain forward motion under most conditions.
•
The Brake Traction Control System (BTCS) works in tandem with full-time four-wheel drive. BTCS provides
resistance to any wheel that is slipping to allow additional torque transfer to wheels with traction.
•
Robust design and improved sealing enhance reliability.
•
No maintenance required.
NV140 Cross Section
1 - MAINSHAFT
2 - REAR OUTPUT SHAFT FLANGE
3 - FRONT OUTPUT SHAFT AND FLANGE
4 - INPUT SEAL
5 - DIFFERENTIAL
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TRANSFER CASE - NV140 - SERVICE INFORMATION
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OPERATION
Full-time 4-wheel drive distributes even torque to all wheels under all conditions. The transfer case center differential
evenly divides torque to the front and rear axles, while also allowing the driveshafts to rotate at different speeds to
account for front and rear wheels traveling different distances while turning. Given that the drive shafts can rotate at
different speeds, the vehicle can remain in full-time 4-wheel drive mode indefinitely, even on dry pavement, without
threat of damage to the drivetrain. The vehicle uses Brake Traction Control to modulate the torque from one wheel
to another across each axle and the transfer case.
REMOVAL
1. Raise vehicle.
2. Remove transfer case drain plug (3) and drain the
transfer case lubricant.
CAUTION: Do not allow propshafts to hang at
attached end. Damage to joint can result.
3. Remove the front and rear propeller shafts. (Refer
to 3 - DIFFERENTIAL & DRIVELINE/PROPELLER
SHAFT/PROPELLER SHAFT - REMOVAL)
4. Support transmission with jack stand.
5. Remove rear crossmember and skid plate, if
equipped.
6. Disconnect transfer case vent hose (4).
7. Support transfer case with transmission jack and
secure with chains.
8. Remove nuts (2) attaching transfer case (1) to
transmission (3).
9. Pull transfer case and jack rearward to disengage
transfer case.
10. Remove transfer case from under vehicle.
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TRANSFER CASE - NV140 - SERVICE INFORMATION
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