ECM monitors several variables, including accumulator pressure,
valve close angle, and injection control valve open-time,
to determine if the pump has malfunctioned.
fuel injection pump is located on the intake side of the engine.
Code 329 can result due to one or more of the following:
fault codes that are caused by bad grounds. Make sure to
troubleshoot other fault codes before following the 329
fault code troubleshooting tree.
fuel inlet restrictions and/or air in the fuel can set the
that does not meet Fuels for Cummins Engines,
Bulletin 3379001, criteria, specifically density and viscosity,
has also been know to set fault code 329.
fuel inlet temperatures can also set fault code 329. Fuel
temperatures at the inlet to the gear pump should not
exceed 60°C [140°F] on ISC and 71°C [160°F]
on ISL engines (Not the INSITE electronic
service tool temperature reading).
fault code could also be caused by a fuel leak in the sealing
plate between the injection control valve and the distributor.
The injection control valve module should be replaced if
a fuel leak in the sealing plate has been identified.
Code 329 can be caused by broken internal injection control
valve components and/or by poor lubricity fuel which scuffed
the internal components of the injection control valve.