20 Most Recent 2008 Ford Explorer 2WD Questions & Answers

Do you know what a serial data network is ? With all the computers car makers put on thier cars these day's they need a communication network for them to talk ,share info. on etc. U codes are codes for the network . A module could be down ,could be a wiring problem . A shorted module or bus wire can bring down the whole vehicle. Could cause the vehicle not to start ,systems not to function . How did you pull this code ,with what scan tool or code reader ? Did it come from the PCM - engine computer ? Need a up scale professional scan tool to check all module's on the vehicle , need to pin point the module that is causing the problem . U1900 CAN Communication Bus Fault - Receive Error 4WD Control Module REPAIR all other DTCs first. CLEAR the DTCs. CYCLE the key OFF then ON and wait 10 seconds. REPEAT the self-test. If DTC U1900 is still present, REFER to Section 418-00 . U1900 CAN Communication Bus Fault - Receive Error ABS Module REPAIR all other DTCs first. CLEAR the DTCs. CYCLE the key OFF then ON and wait 10 seconds. REPEAT the self-test. If DTC U1900 is still present, REFER to Section 418-00 . U1900 CAN Communication Bus Fault - Receive Error DSM REPAIR all other DTCs first. CLEAR the DTCs. CYCLE the key OFF then ON and wait 10 seconds. REPEAT the self-test. If DTC U1900 is still present, REFER to Section 418-00 . U1900 CAN Communication Bus Fault - Receive Error Instrument Cluster REPAIR all other DTCs first. CLEAR the DTCs. CYCLE the key OFF then ON and wait 10 seconds. REPEAT the self-test. If DTC U1900 is still present, REFER to Section 418-00 . U1900 CAN Communication Bus Fault - Receive Error Occupant Classification Sensor Module REPAIR all other DTCs first. CLEAR the DTCs. CYCLE the key OFF then ON and wait 10 seconds. REPEAT the self-test. If DTC U1900 is still present, REFER to Section 418-00 . U1900 CAN Communication Bus Fault - Receive Error Parking Aid Module REPAIR all other DTCs first. CLEAR the DTCs. CYCLE the key OFF then ON and wait 10 seconds. REPEAT the self-test. If DTC U1900 is still present, REFER to Section 418-00 . U1900 CAN Communication Bus Fault - Receive Error RCM REPAIR all other DTCs first. CLEAR the DTCs. CYCLE the key OFF then ON and wait 10 seconds. REPEAT the self-test. If DTC U1900 is still present, REFER to Section 418-00 . U1900 CAN Communication Bus Fault - Receive Error Retractable Running Board Module REPAIR all other DTCs first. CLEAR the DTCs. CYCLE the key OFF then ON and wait 10 seconds. REPEAT the self-test. If DTC U1900 is still present, REFER to Section 418-00 . 016 CAN Communications SECTION 418-00: Module Communications Network 2007 Explorer/Mountaineer/Explorer Sport Trac Workshop Manual DESCRIPTION AND OPERATION Procedure revision date: 08/02/2006 Communications Network Vehicle communication utilizes both medium and high speed controller area network (CAN) communications. CAN is used for many modules to communicate with each other on a common network. CAN in-vehicle networking, is a method for transferring data among distributed electronic modules via a serial data bus. Without serial networking, intermodule communication requires dedicated, point to point wiring resulting in bulky, expensive, complex, and difficult to install wiring harnesses. Applying a serial data network reduces the number of wires combining the signals on a single network. Information is sent to the individual control modules that control each function. The vehicle has 2 module communication networks:

• Medium speed (MS) CAN
• High speed (HS) CAN

Both networks are connected to the data link connector (DLC). This makes diagnosis and testing of these systems easier by allowing one scan tool to be able to diagnose and control any module on both networks from one connector. The DLC can be found under the instrument panel between the steering column and the audio unit. Network Topology Module Name Network Type Termination Module Anti-lock brake system (ABS) module HS-CAN No Audio control module (ACM) MS-CAN No Digital versatile disc (DVD) player (if equipped) MS-CAN No Driver seat module (DSM) (if equipped) MS-CAN No Electronic automatic temperature control (EATC) module (if equipped) MS-CAN No Four wheel drive (4WD) control module (if equipped) HS-CAN No Instrument cluster (IC) (gateway module) HS-CAN MS-CAN Yes Yes Occupant classification sensor (OCS) module HS-CAN No Parking aid module (PAM) (if equipped) MS-CAN No Powertrain control module (PCM) HS-CAN Yes Power running board (PRB) module (if equipped) MS-CAN No Restraints control module (RCM) HS-CAN No Satellite digital audio radio system (SDARS) (if equipped) MS-CAN No Smart junction box (SJB) MS-CAN Yes Transmission control module (TCM) (if equipped) HS-CAN No MS-CAN Network Operation The MS-CAN network communicates using bussed messages. The MS-CAN has an unshielded twisted pair cable, data bus (+) and data bus (-) circuits. In addition to scan tool communication, this network allows sharing of information between all modules on the network. The MS-CAN is a medium speed communication network used for the following modules:

• SJB
• Audio unit
• Instrument cluster
• DSM (if equipped)
• DVD player (if equipped)
• EATC module (if equipped)
• Parking aid module (if equipped)
• Satellite audio receiver (if equipped)
• Power running board module (if equipped)

HS-CAN Network Operation The HS-CAN network communicates using bussed messages. The HS-CAN network uses an unshielded twisted pair cable, data bus (+) and data bus (-) circuits. In addition to scan tool communication, this network allows sharing of information between all modules on the network. The HS-CAN is a high speed communication network used for the following modules:

• PCM
• TCM (if equipped)
• RCM
• ABS module
• Instrument cluster
• Occupant classification sensor module
• 4WD control module (if equipped)

Network Termination The CAN network uses a network termination circuit to improve communication reliability. The network termination of the CAN bus takes place inside the termination modules by termination resistors. Termination modules are located at either end of the bus network. As network messages are broadcast in the form of voltage signals, the network voltage signals are stabilized by the termination resistors. Each termination module has a 120 ohm resistor across the positive and negative bus connection in the termination module. With 2 termination modules on each network, and the 120 ohm resistors located in a parallel circuit configuration, the total network impedance, or total resistance is 60 ohms. Network termination improves bus message reliability by:

• stabilizing bus voltage.
• eliminating electrical interference.

Gateway Module The instrument cluster is the gateway module, translating HS-CAN to MS-CAN and vice versa. This information allows a message to be distributed throughout both networks. The instrument cluster is the only module on this vehicle that has this ability.

RSC stands for "roll stability control" a problem has been detected with the anitlock brakes. The only way to know what has happened is the vehicle must be scanned for trouble code(s). the code will allow the technician to know where the fault lies. it could be a speed sensor, steering sensor or one of many other things. Be advised, until you have repaired and code cleared, the ABS or antilock brakes will not work.It will not affect the running of the vehicle in any way but no ABS/RSC

my streetka keeps overheating iv changed the thermastat but its still over heating any idears wat it can be

That is what I would have suggested.

The control module is behind the dash to the left of the radio. Remove the two screws underneath the radio, this will allow the dash panel to snap out. You can now see the module. Open the rear hatch, look to the left panel under side window, you will find the module behind it.

look under the dash on the left side of the vehicle just left of the brake pedal

First make sure check engine light not on. Second check spark plugs condition plus make sure all ignition coils are firing. Third check fuel pressure. If all pass try upgrading gasoline octane. GOOD LUCK.

why not scan the PCM ? and post all DTC errors. and all symptoms driving , idling , hot ,cold engine,, cruising and going up hills. what engine size, V6 what size. and THe CHECK engine bulb is only timing part of cars. Only a real scan tool can tell you if all live and stored DTCs are clear not. post them as seen. all of them and get 100x better answers.

I answered another person about their alternator lite stayin on even after purchasing new alternator and battery...I told him to re-chek all electrical connections and also sometimes another indicator bulb could be burned out in ur dash n that loose voltage can wander over to the next closet indictor lite n make it glow...

This sounds like a bad fuel pump. start engine with the fluid spray and leave it in park and try to rev the engine and if it dies then check pump or relay but i would bet the pump is bad.

it could be the intake air temp sensor

sounds like either the rear end is going out or you have a bad u-joint

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