Service Manual 3-49
8400 8500/8550 8400 PEST Description
37,022.40: 37,025.43:
Pressure pump motor disconnect. The pressure pump
motor is not drawing the expected power from the supply.
Troubleshooting Procedure for Pressure Pump
Step Questions and Actions Yes No
1
1. Run the Pressure Pump Motor test.
2. Did the test pass?
Replace the
electronics
module.
Go to Step 2.
2
1. Check the purge pump assembly wiring.
2. Is the wiring damaged?
Replace the pressure pump motor.
8400 8500/8550 PEST Description
37,023.41: 37,026.44
Purge valve disconnect. The purge valve is not drawing the
expected power from the supply.
Troubleshooting Procedure for Purge Valve
Step Questions and Actions Yes No
1
1. Run the Purge Vent Solenoid test.
2. Did the test pass?
Go to Step 2. Replace the
purge pump.
2
1. Check the purge pump assembly wiring.
2. Is the wiring damaged?
Replace the defective wiring or the
purge pump.
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