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:
OVERVIEW
WARNING:
To prevent the risk of high-voltage shock, always follow
precisely all warnings and service instructions, including instructions
to depower the system. The high-voltage hybrid system utilizes
approximately 300 volts DC, provided through high-voltage cables to its
components and modules...
System Operation
Gasoline Vehicles
The
main battery, which is located in the engine compartment, is a 12 volt
DC source connected in a negative ground system and is a voltage
stabilizer for the 12 volt electrical system.
A BMS
is attached to the negative side of the battery cable and a generator
current sensor (if equipped) is attached to the positive side of the
battery cable...