Mustang V8-4.6L SC VIN Y (2004)
be found under the instrument panel between the steering column and the radio.
The ISO 9141 communication network does not permit inter-module communication. When the diagnostic tool communicates to modules on the ISO
9141 communication network, the diagnostic tool must ask for all information; the modules cannot initiate communications.
The SCP network will remain operational even with the severing of one of the bus wires. Communications will also continue if one of the bus wires is
shorted to ground or battery positive voltage (B+) or if some, but not all, termination resistors are lost.
Unlike the SCP communication network, the ISO 9141 communication network will not function if the wire is shorted to chassis ground or battery
positive voltage (B+). Also, if one of the modules on the ISO 9141 network loses power or shorts internally, communications to that module will fail.
The powertrain control module (PCM) is on the SCP communication network. The PCM controls the engine for better fuel economy, emissions control,
and failure mode detection and storage. Refer to Symptom Charts in Computer Control Systems for diagnosis and testing of the PCM.
The restraint control module (RCM) is on the ISO 9141 network. The RCM controls the deployment of the air bags based on sensor input.
The generic electronic module (GEM) is on the ISO 9141 network. The GEM module controls a variety of systems including one touch down windows,
wipers, perimeter anti-theft, and warning chimes.
The anti-lock brake control module communicates over the ISO 9141 communication network when not equipped with traction control and
communicates over the SCP communication network when it is equipped with the traction control option. The anti-lock brake control module controls
the brake pressure to the four wheels to keep the vehicle under control while braking.
The instrument cluster is on the SCP communication network. The instrument cluster displays driver information. The instrument cluster incorporates the
PATS control module functions.
