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:
System Operation
Parking Aid - Audible
System Diagram - Without 360 Degree View Camera
Item
Description
1
PAM
2
LHR outer sensor
3
LHF outer sensor
4
LHF inner sensor
5
RHF inner sensor
6
RHR outer sensor
7
RHF outer sensor
8
RHR inner sensor
9
LHR inner sensor
10
Parking aid disable switch
11
PCM
12
ABS module
13
GWM
14
TRM
15
BCM
16
ACM
17
IPC
18
APIM
19
DSP
20
Rear door speakers
21
Front door speakers
22
with 14 or 28 speaker system
System Diagram - With 360 Degree View Camera
Item
Description
1
PCM
2
IPMB
3
LHR outer sensor
4
ABS module
5
GWM
6
TRM
7
BCM
8
ACM
9
IPC
10
APIM
11
DSP
12
Rear door speakers
13
Front door speakers
14
LHF outer sensor
15
LHF inner sensor
16
RHF inner sensor
17
RHR outer sensor
18
RHF outer sensor
19
RHR inner sensor
20
LHR inner sensor
21
Right front active sensor
22
Left front active sensor
23
Right rear active sensor
24
Left rear active sensor
25
Parking aid disable switch
26
PAM
27
with 14 or 28 speaker system
Network Message Chart
PAM Network Input Messages
Broadcast Message
Originating Module
Message Purpose
Gear position
PCM
Enables or disables the front or rear parking aid depending on the gear lever position...
Removal
NOTE:
Removal steps in this procedure may contain installation details.
NOTE:
LH side shown, RH side similar.
Remove the front bumper cover.
Refer to: Front Bumper Cover (501-19 Bumpers, Removal and Installation).
Disconnect the electrical connector, remove the screws and the front fog lamp assembly...