Where are the high and low speed bus wires?

Where are the high and low speed bus wires?

Note: This 2004 Mazda data bus wiring above has CAN high and Lo (hi speed) bus wires at DLC terminals pin 6 and pin 14 respectively. There is also a low speed bus wire (K-Line) at pin 7. These pins at DLC can be easily diagnosed using a voltmeter in minutes!

How to fix no communication bus wiring problems?

2020 shortcut to fix NO Communication bus wiring problems for 2004 Mazda vehicles! Shown below is a 2004 Mazda bus wiring diagram for the DLC connector. To test NO COMMUNICATION fault message from your scanner, you can use this diagram as your guide.

What’s the voltage on a low speed bus?

This is a low speed bus signal and usually is a lone wire going to the accessory modules like ABS and Airbag as shown on right. When testing for voltage, probe PIN 7 against PIN 5 and you should get about 5-7 volts st KOEO. If out of range, disconnect the 3 modules one at a time; ECM, Air bag and ABS modules.

How to fix no start, intermittent shorts?

Using a digital voltmeter, you can fix problems like no start, intermittent shorts by measuring the voltages shown in the DLC pin terminals. Note: This 2004 Mazda data bus wiring above has CAN high and Lo (hi speed) bus wires at DLC terminals pin 6 and pin 14 respectively. There is also a low speed bus wire (K-Line) at pin 7.

What causes the No Bus message on the odometer?

Symptom: Engine will not start. Gauges are inoperative. “No BUS” message displayed on odometer. Problem 1 of 2: The 5v power supply from the Powertrain Control Module (PCM) is shorted due to a shorted Crankshaft Position (CKP) Sensor.

How to diagnose a CAN bus failure?

In the case of a CAN system you must eliminate the possibility of wiring, multiple modules, and mechanical systems causing a failure in the system. A proper diagnostic strategy includes the use of a good bi-directional scan tool.

How does a sub-network work on a CAN bus?

A sub-network could consist of a Dash Integration Module carrying messages to the Body Control Module from various sources such as a radio, instrument cluster or A/C controls. The next step in the diagnostic strategy is to check for communication on the CAN Data lines, in this case pins 6 and 14 of the DLC.

Is there no bus, no gauges possible solution?

I’d like to offer my solution to the frustrating “no bus and no gauges” problem that I see is pretty common. I have a 2000 ram 1500 2X with the 5.9 automatic, however I believe that this is applies to all gen2 trucks regardless of drivetrain or engine type.