Ford Fiesta: Module Communications Network / Communications Network - Overview. Description and Operation
Overview
Multiplexing
is a method of sending 2 or more signals simultaneously over a single
circuit. Multiplexing allows 2 or more electronic modules (nodes) to
communicate over a twisted wire pair [data (+) and data (-)] network.
The information or messages that can be communicated on these wires
consists of commands, status or data. The advantage of using
multiplexing is to reduce the weight of the vehicle by reducing the
number of redundant components and electrical wiring.
The vehicle has 2 module communication networks connected to the DLC
, located under the instrument panel. The communication networks are:
-
High Speed Controller Area Network (HS-CAN)
-
Medium Speed Controller Area Network (MS-CAN)
System Operation
System Diagram
Item
Description
1
DLC
2
PSCM
3
FCDIM (without touchscreen display)
4
HVAC module
5
ACM
6
GPSM (if equipped)
7
TCM (automatic transmission)
8
OCSM
9
PCM
10
ABS module
11
I..
Other information:
Removal
NOTE:
Removal steps in this procedure may contain installation details.
Release the clips and remove the LH upper side trim panel.
Release the clips and remove the RH upper side trim panel.
Remove the retainer, release the clips and remove the liftgate lower trim panel..
Removal
Release the tabs and remove the upper steering column shroud.
Rotate the steering wheel and remove the lower steering column shroud retainer.
Remove the lower steering column shroud.
Rotate the steering wheel and remove the lower steering column shroud retain..
Categories
Preliminary Inspection
Verify the customer concern by carrying out a road test on a
smooth road. If any vibrations are apparent, Refer to the Symptom
Chart: NVH.
To maximize tire performance, inspect for signs of incorrect
inflation and uneven wear, which may indicate a need for balancing,
rotation or front suspension alignment.
Correct tire pressure and driving techniques have an
important influence on tire life. Heavy cornering, excessively rapid
acceleration and unnecessary sharp braking increase tire wear.
Correct
tire pressure and driving techniques have an important influence on
tire life. Heavy cornering, exce
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