P0551

Test 1 - 2:

Test 3 - 6:

SYMPTOM
P0551-POWER STEERING SWITCH PERFORMANCE

WHEN MONITORED
Engine running. Vehicle speed at 50 MPH (80.5 km/h) or greater. Coolant temperature above 20° C (68° F).

SET CONDITION
The power steering pressure switch remains open for 40 seconds or greater while both the vehicle speed is at 50 MPH (80.5 km/h) and the engine coolant temperature above 20° C (68° F). Two trip fault.

POSSIBLE CAUSES
- Good trip counter = 0
- Power steering pressure switch (Z12) ground circuit open
- (K10) PSP switch signal circuit shorted to ground
- (K10) PSP switch signal circuit open
- Power steering pressure switch
- PCM