Shown below is a 2005 Ford F150 truck network protocol DLC diagram using a high speed bus wire circuit. To check NO COMMUNICATION issues when this shows up in your scanner, you only need a voltmeter to fix it. Avoid paying expensive garage rate to troubleshoot it for you.
2005 Ford F150 DLC Diagram Description:
This DLC wiring diagram above will show you a 2005 Ford F150 data bus network which started using high speed CAN protocol. This North American automaker was the first to introduce this type of networking in as early as 2003. This diagram is simpler to follow if you concentrate on the DLC pins instead of the complex bus network terms described here. This will enable you to fix NO COMMUNICATION problems by using practical tool such as a digital voltmeter.
Using both low speed and high serial bus data networks shown here, you can troubleshoot no starts, intermittent issues by hooking the voltmeter to the following DLC pin terminals
DLC terminal pin 3 is hooked to a slow speed data bus called UBP. From this terminal, it comes out as yellow color buss wire connected to GREEN dot connector at Driver Seat Module on top right. From this module, it spreads to BROWN dot connector at Cluster (instrument) Module in bottom right; then Security Module and Temperature (automatic) Modules in the middle top of the diagram.
DLC terminal pin 6 is hooked up to a high speed speed data bus called Can Bus Data + wire shown in green wire. Another network name for it is Can_H where H stands for high speed bus network. From the DLC terminal, it comes out to a gateway module called Cluster Module at the GREEN dot connector next to it. From there it sends the same bus signals to PCM and ABS Modules thru their respective RED dot connectors.
DLC terminal pin 7 is called ISO slow speed bus data signal coming out as Yellow-Green wire going the BLUE dot connector near the Park Module on top left. From this BLUE dot, it is sends the same bus signal to SRS Module below it by way of the red dot connector.
DLC terminal pin 13 is a special terminal used by Ford or garages to program scanners at voltage rate higher than battery voltage. This is not used for troubleshooting and is not included in this discussion.
DLC terminal pin 14 is a high speed network data bus wire called Can Bus Data - or Can_Lo where Lo stands for low speed bus data but is a misnomer because it is a part of the high speed network protocol. Both Can_H and Can_lo bus wires are twisted together so you can identify them as high speed bus network connections to the modules. When looking at the 3 high speed modules at the bottom right, they are connected at the BLUE dot connectors.
DLC terminal pins 4 and 5 are both ground signal whereas pin 16 is the source of battery power.
Troubleshooting 2005 Ford F150 bus network protocol:
Using the same voltmeter, you can test NO COMMUNICATION issues of this vehicle. Start by hooking up the positive lead to DLC Pin 3 (UBP bus wire) against Pin 5 for the negative lead. At key off, the normal reading is zero volt and should read 5.0 volts at key on engine off (KOEO). To verify which module is at fault, disconnect Driver Seat Module at GREEN dot connector, followed by Brown dot at Cluster Module, including the brown dots at Security and temp Modules. This disconnection is done one module at a time and the last module that restored the voltage reading to normal is the culprit.
The same voltage reading is expected at DLC terminal pin 7 for the ISO low speed bus wire. The only difference is the module disconnection happens on their respective red dot connectors.
High speed pin 6 Can Bus + is tested by using the voltmeter. Hooking the positive lead at pin 6 against pin 5 as ground, measure voltage at key off. Normal reading should be 2.5 volts and should fluctuate between 2.5 volts to 3.5 volts at KOEO. To verify, disconnect each high speed modules at their respective red dots. Also looking at the Cluster Module, all hi speed bus signals could be disconnected at the GREEN dot connector at the bottom right.
High speed pin 14 Can Bus - is tested the same way at key off except the fluctuation voltage reading at KOEO is between 1.5 volts to 2.5 volts.
A voltage reading lower than 2.5 volts at pin 6 is shorted to ground while a voltage reading higher than 3.5 at pin 6 is short to power. However a voltage reading lower than 1.5 volts at pin 14 is shorted to ground and higher than 2.5 volts is shorted to power.
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