SFI SYSTEM(w/o EGR System), Diagnostic DTC:P0550,P0552 and P0553
| DTC Code | DTC Name |
|---|---|
| P0550 | Power Steering Pressure Sensor Circuit Malfunction |
| P0552 | Power Steering Pressure Sensor Circuit Low Input |
| P0553 | Power Steering Pressure Sensor Circuit High Input |
DESCRIPTION
The power steering oil pressure switch is turned on when a power steering wheel load is generated by turning the steering wheel. The ECM regulates the engine idling speed according to the voltage output of the sensor.
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
Warning Indicate |
Memory |
|---|---|---|---|---|---|
P0550 |
Power Steering Pressure Sensor Circuit Malfunction |
Power steering oil pressure switch voltage is below 0.28 V, or higher than 4.9 V for 0.5 seconds while the engine is running (1 trip detection logic). |
|
Comes on |
DTC stored |
P0552 |
Power Steering Pressure Sensor Circuit Low Input |
Power steering oil pressure switch voltage is below 0.28 V for 0.5 seconds while the engine is running (1 trip detection logic). |
|
Comes on |
DTC stored |
P0553 |
Power Steering Pressure Sensor Circuit High Input |
Power steering oil pressure switch voltage is higher than 4.9 V for 0.5 seconds while the engine is running (1 trip detection logic). |
|
Comes on |
DTC stored |
WIRING DIAGRAM
MONITOR DESCRIPTION
The ECM monitors the switch voltage and uses this value to regulate the engine idling speed. When the sensor output voltage deviates from the normal operating range, the ECM determines that there is a malfunction in the power steering oil pressure switch and stores a DTC.
CONFIRMATION DRIVING PATTERN
Idle the engine for 5 seconds or more.
CAUTION / NOTICE / HINT
If other DTCs related to different systems that have terminal E2 as the ground terminal are stored simultaneously, there may be an open circuit between terminal E2 and body ground.
Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.
Refer to "Data List / Active Test" [Power Steering Signal] (Click here).
PROCEDURE
CHECK HARNESS AND CONNECTOR (ECM - POWER STEERING OIL PRESSURE SWITCH)
Disconnect the ECM connector.
Disconnect the power steering oil pressure switch connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection
Condition
Specified Condition
C23-2 (PSP) - C29-16 (PSP)
Always
Below 1 Ω
C23-1 (VC) - C28-15 (VCV1)
Always
Below 1 Ω
C23-3 (E2) - C29-7 (E2)
Always
Below 1 Ω
C23-2 (PSP) or C29-16 (PSP) - Body ground
Always
10 kΩ or higher
C23-1 (VC) or C28-15 (VCV1) - Body ground
Always
10 kΩ or higher
Result
Result
OK
NG
NG REPAIR OR REPLACE HARNESS OR CONNECTOR
REPLACE POWER STEERING OIL PRESSURE SWITCH
Replace the power steering oil pressure switch.
Result
Result
NEXT
CONFIRM WHETHER DTC OUTPUT RECURS
Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG).
Turn the tester on.
Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
Read the DTCs.
Powertrain > Engine and ECT > Trouble Codes
Result
Result
Proceed to
P0550, P0552 and/or P0553 is output
A
No DTC is output
B
B END