TSB170025-030320

Reading Natural Gas Fuel Pressures in INSITE™ Electronic Service Tool
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Technical Service Bulletin Number
TSB170025
Technical Service Bulletin
Subject
Reading Natural Gas Fuel Pressures in INSITE™ Electronic Service Tool
Warranty Statement
The information in this document has no effect on present warranty coverage or repair
practices, nor does it authorize TRP or Campaign actions.
Contents
Product Affected
• ISB6.7 G CM2180 B118
• ISL G CM2180
• ISX12 G CM2180 EJ
Issue
Inconsistent and vague fuel pressure units in INSITE™ electronic service tool are leading to
unnecessary replacement of fuel system components.
Verification
• Open INSITE™ electronic service tool and connect to engine control module (ECM).
• Under “Data Monitor/Logger” tab, check units listed for “Fuel Regulator Intake
Pressure”, “Fuel Regulator Outlet Pressure”, and “Barometric Air Pressure”
parameters.
• If units are not consistent, errors can occur during fuel system troubleshooting.
Related fault codes include 2568, 2722, 2723, 2724, 2725, and 2991.
https://qsol.cummins.com/qs3/pubsys2/xml/en/tsb/2017/tsb170025.html
3/27/2017
Reading Natural Gas Fuel Pressures in INSITE™ Electronic Service Tool
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Resolution
• 1 psi is equal to 2 in-hg of pressure. To convert INSITE™ electronic service tool
default units:
◦ psi to in-hg: multiply value by 2.
◦ in-hg to psi: divide value by 2.
• All units in INSITE™ electronic service tool are in absolute pressure. To compare to
mechanical gauge, subtract local atmospheric pressure.
• Local atmospheric pressure value can be found online or, if no additional fault codes
are present, from “Barometric Air Pressure” parameter in INSITE™ electronic service
tool.
• Default INSITE™ electronic service tool fuel and atmospheric pressure units can be
found in Table 1.
Table 1, Default INSITE™ Electronic Service Tool Parameter Units
Fuel Regulator Intake Pressure
in-hg (Absolute)
Fuel Regulator Outlet Pressure
psi (Absolute)
Barometric Air Pressure
in-hg (Absolute)
• Take following steps to make all fuel and atmospheric pressure units in INSITE™
electronic service tool consistent:
1. Open INSITE™ electronic service tool
2. Select “Tools” drop down menu from toolbar at top of screen
3. Select “Options” at bottom of drop down menu
4. Select “Units of Measure” in left hand box
5. Select “Custom” at bottom of middle list, and select “Add” box
6. Name your group “Uniform Natural Gas Pressure Units”, then select “+” box to
left of group name on middle list to open drop down menu
7. Find “Ambient Pressure”, “Fuel Pressure”, and “Intake Manifold Pressure” rows in
“Type” (left hand) column, and verify units in “Unit” (right hand) column are
consistent for all three parameters.
8. Verify new group is selected at top of menu under “Current Units of Measure
Group” when troubleshooting natural gas fuel pressure faults.
9. Select “Apply” then “OK” to exit menu.
10. When repair is finished, repeat these steps but select your region under “Current
Units of Measure Group” to verify correct units are selected when troubleshooting
other engine platforms.
Document History
Date
2017-3-3
Details
Module Created
Last Modified: 08-Mar-2017
Copyright © 2000-2010 Cummins Inc. All rights reserved.
https://qsol.cummins.com/qs3/pubsys2/xml/en/tsb/2017/tsb170025.html
3/27/2017