Ford Electric Ranger 1998 Student Manual page 51

1998 Ranger EV New Model Training
LESSON 1: VEHICLE OVERVIEW
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Multiplexing is an operating strategy where control modules can
communicate with each other during normal vehicle operation.
•
Multiplexing only occurs over the J1850 network.
•
Modules that are multiplexed use the J1850 network and standard
corporate protocol (SCP) to communicate (a protocol is a type of
computer language).
•
The International Standard Organization (ISO) 9141 network is
NOT a multiplexed network.
•
The ISO 9141 network is only used for diagnostic purposes and is
not active during normal vehicle operation.
•
In order for the ISO 9141 network to be active, a scan tool must be
connected to the network.
•
The Electric Ranger has both a J1850 (SCP) and an ISO 9141
network.
•
The J1850 (SCP) network consists of:
– a twisted pair of connecting wires (known as a data bus) in the
wiring harness (Circuits 914 and 915).
– traction inverter module (TIM).
– battery control module (BCM).
– interface adapter assembly (IAA).
– data link connector (DLC) (located next to the steering column).
•
The ISO 9141 network consists of:
– a single wire data bus (circuit 70).
– anti-lock brake system (ABS) module.
– central timer module (CTM).
– electronic crash sensor (ECS) module.
– DLC.
•
Diagnostics for both networks is accessed through the DLC using
New Generation STAR (NGS) Tester (covered in Lesson 5).
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