PCM Troubleshooting Guide

PCM Troubleshooting Guide

Pre-requisite

  1. Multimeter/Voltmeter

Testing

Measure the Output Voltage of the PCM at the OUT Terminals with a Multimeter/Voltmeter.
If the Output Voltage is 13.5 (+/- 0.5V), the PCM is functionally operational.
However, if the Output Voltage is low (less than 1V) please follow the below steps to Troubleshoot and identify the issue.
  1. Disconnect the Positive Input connection from the PCM Terminal.
  2. Measure the Truck Battery Voltage and confirm to be above 12V. if it's less, go to See 'Less than 12V' below.
  3. Re-connect Battery to the PCM's Positive Input.
  4. Measure the Output Voltage of the PCM.
  5. If Output Voltage is still low See 'Hardware Fault' below.
  6. If the Output Voltage is at 13.5V (+/- 0.5V), the PCM is functional. This means the Battery Voltage Monitoring timer circuit had turned OFF the PCMs output and disconnecting the Input Voltage caused the circuit to be Reset.

Less than 12V

Disconnect the PCM completely and connect the input Terminals of the PCM to a Voltage source confirmed to be above 12V. Continue to Step 3. 

Hardware Fault

if after confirming the power source is above 12V and the PCM’s output voltage is measured to still be Low after the above procedure, the PCM can be deemed faulty and returned to Black Moth RMA.

Quick Guide

Normal Operation 

The power input to the PCM is 12-18V and the PCM output is 13.5V (+/- 0.5V). 

Not Enough Voltage

The PCM needs at least 12V to convert it to 13.5, if it's under voltage the PCM fail to convert any power. 
Note: For the first 20 seconds whatever the power is will be passed through but at 20 seconds it will detect it's not enough and the PCM will cut off the Output. 

Short Circuit

If it appears that enough power is coming through but no power is exiting the PCM then it's detected a short on the incoming power.

Possible Faulty PCM

If the input is 12-18V but the PCM output is less than 1V but more than 0V. See 'Testing' above.




    • Related Articles

    • Troubleshooting Articles

      Tiger Troubleshoot AtlasMX Power Path GPS - Troubleshooting GPS - Slow to Boot GPS - Antenna Diagnostics GSM Modem Device Not Booting No Touchscreen, No GSM, No GPS GSM False Health States Camera SmartMX Camera Troubleshooting - Internal SmartMX ...

    • SmartMX Camera Troubleshooting

      Software Check Before continuing with this guide first confirm the following: The camera view is not loading on the display (see below) The other camera views are working (use the on-screen buttons to check) Support has confirmed there's no software ...

    • Monitor Troubleshooting - Dual Monitor Setup (Atom Module Installed)

      Used to determine the root cause of power, flickering/colour or touch related issues when there are 2 monitors installed on the installation. Display Ports Display port 1 (Atom - Customer Software) is on the topside and display port 2 (Atlas - ...

    • SmartMX - Care Guide

    • Monitor Cable Connector Troubleshooting

      Cable Connector Flex The connector should have a solid fitment and have no flex or wiggle when fitted to a monitor.  Front and Back Confirm the connector is plugged into the monitor.  While holding the BASE of the connector PUSH the connector towards ...