Module Communications Network Ford Explorer Sport Trac I

GENERAL SPECIFICATION

Module Communications Network General Specifications (1 Of 2)

Module Communications Network General Specifications (2 Of 2)

The module communications network consists of the following items

1. Generic Electronics Module (GEM)
2. Standard Corporate Protocol (SCP) Communications Network
3. International Standards Organization (ISO) Communications Network
4. Powertrain Control Module (PCM)
5. Anti-Lock Brake Module (ABS)
6. Restraint Control Module (RCM)
7. Central Security Module
8. Four-Wheel Drive (4WD) Control Module (If Equipped)

On Explorer Sport, refer to SYSTEM WIRING DIAGRAMS for schematic and connector information. On Explorer Sport Trac, refer to SYSTEM WIRING DIAGRAMS for schematic and connector information.

Scheme 1

Principles Of Operation

The vehicle has two module communications networks. The standard corporate protocol (SCP), which is an unshielded twisted pair cable (data bus plus, circuit 914 [TN/OG] and data bus minus, circuit 915 [PK/LB]); and the international standards organization (ISO) 9141 network which is a single wire (circuit 70 [LB/WH]). The diagnostic tool can connect to both networks through the data link connector (DLC). This makes diagnosis and testing of these systems easier by allowing one smart tester to be able to diagnose and control any module on the two networks from one connector. The DLC can be found under the instrument panel between the steering column and the radio.

The SCP communication 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 voltage, or if some, but not all, termination resistors are lost.

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.

Unlike the SCP, the ISO 9141 communication network will not function if the wire is shorted to ground or battery voltage. Also, if one of the modules on the ISO 9141 communication network loses power or shorts internally, communications to that module will fail.

There is one module linked to the SCP communication network and five modules linked to the ISO 9141 communication network.

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. For additional information, refer to COMPUTERIZED ENGINE CONTROLS .

The restraint control module (RCM) is on the ISO 9141 communication network. The RCM controls the deployment of the air bags based on sensor input. For additional information, refer to AIR BAG RESTRAINT SYSTEMS .

The generic electronic module (GEM) is on the ISO 9141 communication network. The GEM controls a variety of systems

1. Windshield Wipers
2. Courtesy Lamps
3. Warning Chimes
4. Interior Lamps
5. Exterior Lamps
6. Power Windows

The central security module is on the ISO 9141 communication network. The central security module controls the keyless remote entry of the vehicle. For additional information, refer to HANDLES, LOCKS, LATCHES & ENTRY SYSTEMS .

The anti-lock brake control (ABS) module is on the ISO 9141 communication network. The ABS module controls the brake pressure to the four wheels to keep the vehicle under control while braking. For additional information, refer to ANTI-LOCK BRAKES .

The four-wheel drive (4WD) control module is on the ISO 9141 communications network. The 4WD module controls all four-wheel drive functions including the 4WDLOW and 4WDHIGH indicator lamps. For additional information, refer to FOUR-WHEEL DRIVE SYSTEMS .

Scheme 2

1. Verify the customer concern.
2. Visually inspect the following for obvious signs of electrical damage
3. If the concern remains after the inspection, connect the diagnostic tool to the data link connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle: Check that the program card is correctly installed. Check the connections to the vehicle. Check the ignition switch position. If the diagnostic tool still does not communicate with the vehicle, go to Pinpoint Test I. See «PINPOINT TEST I: NO MODULE/NETWORK COMMUNICATION - NO POWER TO DIAGNOSTIC TOOL»(/ford/explorer-sport-trac/i-2000-2005/remont/communication-devices/#module-communications-network) .
4. Go to Pinpoint Test PC. See «PINPOINT TEST PC: DATA LINK DIAGNOSTICS TEST»(/ford/explorer-sport-trac/i-2000-2005/remont/communication-devices/#module-communications-network) .

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Communication Circuit Wiring Repair

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1. Disconnect the battery ground cable.
2. Strip the wires.
3. Solder the wires. Install the heat shrink tube. Twist the wires together. Solder the wires together.
4. Bend the wires back in a straight line.
5. Position previously installed (A) heat shrink tube over the (B) wire repair. Overlap the heat shrink tube on both wires.
6. Use the heat gun to heat the repaired area until adhesive flows out both ends of the heat shrink tube.
7. Reconnect the battery ground cable.

See also:
• COMPUTERIZED ENGINE CONTROLS
• AIR BAG RESTRAINT SYSTEMS
• HANDLES, LOCKS, LATCHES & ENTRY SYSTEMS
• ANTI-LOCK BRAKES
• FOUR-WHEEL DRIVE SYSTEMS
• FORD MOTOR CO.
• PINPOINT TEST I: NO MODULE/NETWORK COMMUNICATION - NO POWER TO DIAGNOSTIC TOOL