Lincoln Aviator: Power Steering / Description and Operation - Power Steering - Overview
Overview
The EPAS
system provides steering assist by replacing the conventional hydraulic
valve system with a steering gear equipped with an integrated
electrical motor and PSCM. The motor operation and level of steering assist provided is controlled by the PSCM.
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...
System Operation
System Diagram
Item
Description
1
EPAS gear
2
EPAS motor
3
EPAS position sensor
4
EPAS torque sensor
5
PSCM
6
GWM
7
PCM
8
IPC
9
BCM
10
RCM
11
ABS
12
IPMB
13
IPMA
14
PAM
15
SASM
16
SCCM
17
SUMA
Network Message Chart
PSCM Network Input Messages
Broadcast Message
Originating Module
Message Purpose
Anti-lock brake control activated
ABS module
Informs the PSCM an anti-lock brake event is taking place...
Other information:
Symptom Chart(s)
Preliminary Inspection
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).
Before diagnosing or repairing the seatbelt system, inspect the following items:
Seatbelt webbing integrity (torn, frayed, cut or stretched)
Seatbelt buckle and tongue assembly (latching and release, foreign debris)
Symptom Chart: Seatbelt System
Symptom Chart
Condition
Action
The seatbelt warning indicator does not operate
GO to Pinpoint Test A
The seatbelt warning chime does not operate
GO to Pinpoint Test B
The seatbelt retractor webbing does not
extract or exhibits excessive pressure on the occupant during use
GO to Pinpoint Test C
The seatbelt retractor webbing does not retract or has excessive slack during use
GO to Pinpoint Test C
The Belt-Minder® feature is inoperative
GO to Pinpoint Test D
The seatbelt tongue is rotated on the seatbelt webbing
GO to Pinpoint Test E
The seatbelt webbing is twisted at the seatbelt guide
GO to Pinpoint Test E
The seatbelt webbing is dirty or soiled
GO to Pinpoint Test E
Pinpoint Tests
PINPOINT TEST A : THE SEATBELT WARNING INDICATOR DOES NOT OPERATE
Normal Operation and Fault Conditions
Turn the ignition on and monitor the airbag warning indicator after the IPC proves out...
General Specifications
Item
Specification
Base and Reserve without trailer tow vehicles
Rating
220 amps
Generator amps at 80.6°F (27°C)
98.1 amps at 625 rpm (min) to 180 amps at 2,500 rpm (max)
Generator pulley ratio
2...
Categories
The front outboard and rear safety restraints
in the vehicle are combination lap and
shoulder belts.
Insert the belt tongue into the proper
buckle (the buckle closest to the direction
the tongue is coming from) until you hear
a snap and feel it latch. Make sure that
you securely fasten the tongue in the
buckle.

To unfasten, press the release button
and remove the tongue from the buckle.
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