RoadRelay Frequently Asked Questions

What is the warranty period for my RoadRelay?
Unless you have purchased an extended warranty coverage package, the standard warranty period for the RoadRelay is 90 days from the date of purchase.

Should my RoadRelay work with a non-Cummins engine?
As long as the diesel engine you have is electronically-controlled and its Electronic Control Module (ECM) broadcasts data over the public J1708/J1587 or J1939 data link, RoadRelay will work with it.

Before requesting support, please experiment a bit to reproduce and isolate the problem. When you do contact support, please be ready to provide the following information:

  • Make and model of the vehicle in which your Roadrelay 4 is installed
  • Engine type (for example, 2001 Cummins ISX)
  • Software version of your RoadRelay
  • Any electronic subsystems on your vehicle (for example, ABS)

If you believe that your RoadRelay was properly installed and you were unable to resolve a problem by reading the Frequently Asked Questions and manuals, you may call the Cummins Information Products Help Desk at 1-800-433-9341.

RoadRelay Installation

After installing my RoadRelay, why won't the display turn on?
The RoadRelay is probably not getting power. Check that the key is in the "On" position, the fuses are in circuit and intact, and the wiring is consistent with what is specified in the installation manual. Verify with a voltmeter that power is being applied from the 6-pin vehicle connector pins to the RoadRelay 4. Press the "Up" arrow several times to brighten the display.

After installing my RoadRelay, why won't the display turn off after 30 seconds with the key in the "Off" position like it's supposed to?
It sounds like you may have wired unswitched battery power to the switched power input of the RoadRelay. Check the wiring to ensure it is consistent with what is specified in the instruction manual.

After installing my RoadRelay, why does the display go blank immediately after turning the key to the "Off" position.
It sounds like you do not have the unswitched power wired correctly. Check the wiring of the switched and unswitched power connections to ensure they are consistent with what is specified in the instruction manual.

After installing my RoadRelay, why am I getting a "RoadRelay Data Link Failure" or "Improper Data Link Connection" error message?
It is likely that the data link connections have not been made properly. Verify that all the data link wires have been properly connected, as specified in the installation manual, the key is in the "On" position, and there are no open or shorted wires and no bent connector pins. Measure the data link wires with a voltmeter to ensure they are in the voltage range specified in the troubleshooting section of the installation manual.

After installing my RoadRelay, what should I do if I see a "No Power From Backup Battery" error message?
It is likely that either the loop-back connector is not installed (for RoadRelay 4 only) or the RoadRelay back-up battery is dead. For the RoadRelay 4, make sure that the 10-pin loop-back connector has been properly installed, as described in the installation manual. Measure the back-up battery voltage on the 10-pin loop-back interface connector on the RoadRelay 4 to verify it is not below 2.0 Volts DC. If the battery is dead in your RoadRelay, you will need to have it replaced at an authorized Cummins repair facility. Note that opening the RoadRelay yourself and attempting to replace the battery voids the warranty.

RoadRelay Hardware

Why won't my RoadRelay display turn on?
The RoadRelay is probably not getting power. Check that the key is in the "On" position, no fuses are blown, and the wiring is consistent with what is specified in the installation manual. Verify with a voltmeter that power is being applied from the 6-pin vehicle connector pins to the RoadRelay. Press the "Up" arrow several times to brighten the display.

Why isn't my RoadRelay reading any data and I am getting either a "RoadRelay Data Link Failure" or "Improper Data Link Connection" error message?
It is likely that the one or more of the data link connections has come loose. Verify that all the data link wires and splices are tightly connected, as specified in the installation manual, the key is in the "On" position, and there are no open or shorted wires and no bent connector pins. Measure the data link wires with a voltmeter to ensure they are in the voltage range specified in the troubleshooting section of the installation manual.

What should I do if I see a "No Power From Backup Battery" error message?
For RoadRelay 4, it is likely that either the loop-back connector is not installed or the back-up battery is dead. Make sure that the 10-pin loop-back connector has been properly installed, as described in the installation manual. Measure the back-up battery voltage on the 10-pin loop-back interface connector on the RoadRelay 4 to verify it is not below 2.0 Volts DC. For RoadRelay 5, it is likely that the rechargeable battery is dead. If the backup battery error message does not go away after the RoadRelay 5 has been connected to vehicle power for two days, return the RoadRelay 5 to an authorized Cummins distributor or dealer to get the battery replaced. If the battery is dead, only an authorized Cummins repair facility may replace it iwthout voiding the warranty.

What should I do if I see a "RoadRelay Failure" error message?
Take your failed RoadRelay unit to an authorized Cummins repair facility.

RoadRelay Software

What should I do if I see a "Memory Full" or "Memory Almost Full" warning message?
This indicates that the RoadRelay has reached or has come close to reaching its maximum data memory capacity and the data should be extracted from the RoadRelay or it may be lost. Perform a data extraction using PowerSpec software for RoadRelay 5 or INFORM/INSPEC software for RoadRelay 4 or reset the trip information to remove the data from the RoadRelay. To reset the RoadRelay 4 trip information you must press key 6 (Pages), scroll down using key 7 (down arrow), and select the reset trip option (press the enter key).

I am an owner/operator and my RoadRelay is set to fleet mode. How can I change it?
You must use the PowerSpec software to turn fleet mode off and enable Owner/Operator mode.

How do I change the language being displayed?
For RoadRelay 5, select the Configuration & Settings (Wrench and Hammer)icon, then select the Driver icon, then select the Languages option and select the language you want (press the enter key). For RoadRelay 4, press key 8 (question mark) and select the language you want (press the enter key).

How do I change the units of measure being displayed?
For RoadRelay 5, first select the Configuration & Settings (Wrench and Hammer) icon, then the RoadRelay Configuration icon, then select the Units option and select the units you want displayed. For RoadRelay 4, press key 5 (front panel) to reach the configuration screen that allows you to access the menus for selecting units of measure.

How do I change the vehicle setup for a heavy-duty or RV application?
For RoadRelay 5, select the Configuration & Settings (Wrench and Hammer) icon, then select the RoadRelay configuration icon, then select the Vehicle Setup option and select the vehicle configuration you want (press the enter key). For RoadRelay 4, press key 5 (front panel) to reach the configuration screen, then select the vehicle setup option to change the current vehicle configuration (press the enter key).

Where do I find the software version in my RoadRelay?
For RoadRelay 5, select the Configuration & Settings (Wrench and Hammer) icon, then select the RoadRelay configuration icon, then select the Software Version option. For RoadRelay 4, press key 5 (front panel) to reach the configuration screen, then select the software version option (press the enter key).

The RoadRelay Fault Table is displaying SPN, FMI (or SID, PID) for faults. How do I convert this to real Cummins Fault Code?
QuickServe Online contains a simple to use SPN/FMI to Cummins Fault Code cross reference. Log into QuickServe Online, select the “Service” tab, then under the “Related Information” section, select “SPN/FMI to Cummins Fault Code cross reference”. Visit QuickServe Online or contact your Cummins distributor about access to Cummins QuickServe Online.

I want to use the Anti-theft feature of the Cummins Engine and RoadRelay. How do I do this?
You may download instructions on how to enable the Anti-theft feature in the Cummins Engine ECM by clicking here.

I am interested in developing an application that communicates with the RoadRelay through the open interface. How do I obtain the information I need to do this?
You may download the RoadRelay open interface specification by clicking here.

RoadRelay Data Extraction

What should I do if I see a "Memory Full" or "Memory Almost Full" warning message?
This indicates that the RoadRelay has reached or has come close to reaching its maximum data memory capacity and the data should be extracted from the RoadRelay or it may be lost. Perform a data extraction using PowerSpec software for RoadRelay 5 or INFORM/INSPEC software for RoadRelay 4 or reset the trip information to remove the data from the RoadRelay. To reset the RoadRelay 4 trip information you must press key 6 (Pages), scroll down using key 7 (down arrow), and select the reset trip option (press the enter key).

Do I need a special cable to extract data from the RoadRelay with?
Not for the RoadRelay 5. Only for the RoadRelay 4, you will need to order the optional RS-232 data extraction cable (P/N 4003775) from your Cummins distributor.