Troubleshooting
© 2021 EMP Inc.
18
Troubleshooting
Symptom
Check
Pump not running
•
Check electrical connections.
•
Check ignition enable wire.
•
Check if ignition enable wire is “on”.
•
Verify ignition enable pin location.
Pump is running but not pumping
fluid
•
Check system fluid level.
•
Check for tubing restrictions (kinks).
•
Make sure pump is primed.
•
Check for collapsed inlet or outlet hose.
•
Check pump inlet for trapped debris.
No CAN communication and/or
pump not responding to CAN
commands
•
Check communication harness wiring.
•
Verify that CAN messages are being transmitted in the proper formats.
•
Verify that the proper component CAN address is being used.
Suspected water pump seal leak
•
Reference
Service Bulletin Electric Water Pump Inspection and Diagnostic
Procedures
, EMP document 9910085143.
Water pump seal leak
•
Verify coolant level.
•
Verify coolant selection (for water seal life OAT, phosphate free, silicate free
coolant is recommended).
•
Sample coolant and review coolant maintenance records.
•
Verify system is not aerated (Reference document 9910085145,
Fill D&D Test
and Acceptance Criteria
).
•
Check for cavitation or low inlet pressure.
Pump producing excessive noise
•
Check for cavitation or low inlet pressure.
•
Check pump inlet for trapped debris.
•
Check plumbing around pump for valves or components where cavitation may
be occurring.
•
Check for collapsed inlet hose.