Steering - Pressure Switch Diagnostics/Replacement
No.: TSB-04-37A-001DATE: January, 2004
MODEL: 2004 Endeavor & Galant
SUBJECT:
POWER STEERING PUMP PRESSURE SWITCH
REPLACEMENT PART AVAILABILITY
PURPOSE
This bulletin introduces a new service part. The power steering pump pressure switch is now available as a separate part. Power steering pump replacement is no longer necessary if the pressure switch fails.
Power steering pump pressure switch diagnostic and replacement procedures are included.
AFFECTED VEHICLES
2004 Endeavor
2004 Galant
PROCEDURE
Repair on a customer complaint basis only.
Diagnosis
To adjust the engine speed to compensate for power steering fluid pressure variations during idling or driving conditions, the PCM determines whether the power steering pump pressure switch turns ON or OFF. If the PCM detects a pressure switch malfunction, the "Service Engine Soon" lamp will illuminate and DTC P0551 (Power Steering Circuit Range/Performance) or DTC P0554 (Power Steering Switch Circuit Diagnosis) will set. If either of these codes appear, diagnose according to the steps in service manual Group 13 (Multiport Fuel Injection Diagnosis).
If replacement of the switch is required, follow the instructions below.
Switch Replacement
1. Before removing the switch, wipe the pump clean to prevent contaminants from entering the pump.
2. Disconnect the harness connector from the switch.
3. Using a deep socket, loosen and remove the switch.
4. Hand-thread the new switch into the threaded hole in the pump.
5. Tighten the switch to 19.6 +/- 2.9 Nm (14.5 +/- 2.17 ft-lb).
NOTE: To prevent possible damage which might affect switch electrical operation, avoid contact with the terminal part of the switch during installation.
6. Connect the harness connector onto the new pressure switch male terminal.
7. Test the vehicle to make sure the new switch operates properly.
PARTS INFORMATION
WARRANTY INFORMATION
Repair on a customer complaint basis only.