EMP WP29 - Troubleshooting; Pump Not Running; Pump Not Pumping Fluid; Communication and Response Issues

Troubleshooting
© 2017 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.