Symptom:
P0551-POWER STEERING SWITCH PERFORMANCE
When Monitored and Set Condition:
P0551-POWER STEERING SWITCH PERFORMANCE
When Monitored: Engine running. Vehicle speed at 50 MPH (80.5 KMh) 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 KMh) 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
TEST ACTION APPLICABILITY
1 Ignition on, engine not running.
With the DRBIIIt, read DTCs and record the related Freeze Frame data.
Is the Good Trip Counter displayed and equal to zero?
All
Yes → Go To 2
No → Refer to the INTERMITTENT CONDITION symptom in the
Driveability category.
Perform POWERTRAIN VERIFICATION TEST VER-2-NGC.
2 Turn the ignition off.
Disconnect the Power Steering Pressure Switch harness connector.
Measure the resistance between Ground and the PSP Switch (Z12) ground circuit at
the Power Steering Pressure Switch connector.
Is the resistance below 5.0 ohms?
All
Yes → Go To 3
No → Repair the open in the PSP Switch (Z1) ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER-2-NGC.
205
DRIVEABILITY - NGC
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