Lincoln Aviator: Front Drive Halfshafts / Diagnosis and Testing - Front Drive Halfshafts
Principles of Operation
Inspection and Verification
-
Verify the customer concern.
-
Visually inspect for obvious signs of mechanical or electrical damage.
-
If an obvious cause for an observed or reported concern is
found, correct the cause (if possible) before proceeding to the next
step
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If the cause is not visually evident, verify the symptom and refer to the Symptom Chart.
Symptom Chart: NVH
Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.
REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).
Symptom Chart NVH
Condition
|
Possible Sources
|
Actions
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Axle howling or whine – front axle
|
-
Damaged or worn wheel hub bearings
|
-
CHECK for abnormal wheel hub bearing play or roughness.
REFER to: Front Wheel Bearing and Wheel Hub (204-01A Front Suspension - RWD, Removal and Installation).
|
Driveline clunk - loud clunk when shifting from REVERSE to DRIVE
|
-
Damaged or worn Constant Velocity (CV) joints
|
-
INSPECT the Constant Velocity (CV)
joints for wear or damage. INSTALL a new halfshaft or driveshaft as
necessary.
REFER to: Halfshaft (205-04 Front Drive Halfshafts, Removal and Installation).
|
|
-
CHECK the torque on the hub nut.
REPLACE the hub nut if the torque is not at specification. For front hub
nuts.
REFER to: Front Wheel Bearing and Wheel Hub (204-01A Front Suspension - RWD, Removal and Installation).
REFER to: Halfshaft (205-04 Front Drive Halfshafts, Removal and Installation).
|
Driveline clunk — occurs during acceleration or from cruise to coast/deceleration
|
-
Damaged or worn Constant Velocity (CV) joints
|
-
INSPECT the inner Constant Velocity
(CV) joint and boot. INSTALL a new halfshaft as necessary.
REFER to: Halfshaft (205-04 Front Drive Halfshafts, Removal and Installation).
|
|
-
CHECK the torque on the hub nut.
REPLACE the hub nut if the torque is not at specification.
REFER to: Halfshaft (205-04 Front Drive Halfshafts, Removal and Installation).
REFER to: Front Wheel Bearing and Wheel Hub (204-01A Front Suspension - RWD, Removal and Installation).
|
Driveline clunk — occurs as the vehicle starts to move forward following a stop
|
-
Loose hub nut
-
Damaged or worn CV joints
|
-
CHECK the torque on the hub nut.
REPLACE the hub nut if the torque is not at specification.
REFER to: Halfshaft (205-04 Front Drive Halfshafts, Removal and Installation).
|
Clicking, popping or grinding - occurs while the vehicle is turning
|
-
Inadequate or contaminated lubrication in the Constant Velocity (CV) joints
|
-
CHECK the Constant Velocity (CV)
boots and joints for wear or damage. INSTALL new components as
necessary.
REFER to: Halfshaft (205-04 Front Drive Halfshafts, Removal and Installation).
|
-
Another component contacting the halfshaft
|
-
CHECK the halfshafts and the area around the halfshafts. REPAIR as necessary.
|
Grunting — normally associated with a shudder experienced during acceleration from a complete stop
|
-
Halfshaft Constant Velocity (CV) joint binding
|
-
CHECK the outer Constant Velocity
(CV) joint for correct seating into the hub. REPAIR as necessary.
REFER to: Halfshaft (205-04 Front Drive Halfshafts, Removal and Installation).
|
Special Tool(s) /
General Equipment
204-592Separator, Lower Arm Ball JointTKIT-2006C-FFMFLMTKIT-2006C-LMTKIT-2006C-ROW
Tie Rod End Remover
Tire Lever
Removal
NOTICE:
Suspension fasteners are critical parts that affect the
performance of vital components and systems...
Other information:
Washer Fluid Check
WARNING: If you operate your
vehicle in temperatures below 41.0°F (5°C),
use washer fluid with antifreeze protection.
Failure to use washer fluid with antifreeze
protection in cold weather could result in
impaired windshield vision and increase
the risk of injury or accident...
System Operation
System Diagram
Item
Description
1
SECM
2
ECU
3
Private CAN
4
IPMA
5
SIMA
6
PSCM
7
GWM
8
Locking solenoid
9
SASM
10
BCM
11
PCM
12
IPC
13
SUMA
14
RCM
15
Motor
16
HVAC module
17
APIM
Network Input Message Chart
SECM Network Input Messages
Broadcast Message
Originating Module
Message Purpose
Active front steering request
PSCM
Requests steering angle changes for stability control events...