E 350 V10-6.8L (2007)
ISO 9141 Communications Network
The ISO 9141 communications network is a single wire network. The ISO 9141 communications network does not permit intermodule
communication. The ISO 9141 is used for diagnostic use only. When the scan tool communicates to the RCM, the scan tool must request all
information, the module cannot initiate communications.
The following modules are on the ISO 9141 network:
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Restraints control module (RCM)
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Anti-lock brake system (ABS) module (without roll stability control) (if equipped)
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Parking aid module (if equipped)
ISO 9141 Network Communication Fault Chart
The fault chart describes the specific ISO 9141 network failures and their resulting symptom.
MS-CAN
The MS-CAN network uses an unshielded twisted pair cable of data (+) and data (-) circuits. The data (+) and the data (-) circuits are each regulated to
approximately 2.5 volts during neutral or rested network traffic. As bus messages are sent on the data (+) circuit, voltage is increased by
approximately 1.0 volt. Inversely, the data (-) circuit is reduced by approximately 1.0 volt when a bus message is sent. Multiple bus messages can
be sent over the network CAN circuits allowing multiple modules to communicate with each other and designed for general information transfer. The
MS-CAN network will not communicate while certain faults are present, but will operate with diminished performance with other faults present. The
MS-CAN bus may remain operational when 1 of the 2 termination resistors are not present.
The MS-CAN network operates at a maximum data transfer speed of 125 Kbps for bus messages and designed for general information transfer. The
network will remain operational, but at a degraded level when certain circuit faults are present. The MS-CAN network may remain operational with
only one termination resistor present.
The following modules are on the MS-CAN network:
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Instrument cluster
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Vehicle security module (VSM)