DT: Power Steering Pressure (PSP) Sensor
DT: Introduction See: DT: Power Steering Pressure (PSP) Sensor - Introduction
DT1 DTC P1550: VERIFY OPERATOR INTERACTION
Did you turn the steering wheel at least one-half turn within 20 seconds of starting KOER self-test?
Yes
KEY OFF. If there are any symptoms with the power steering system (for example, lack of power assist), go to Steering Systems - General Information. If no symptoms are present With the power steering system, GO to DT2
.
No
DT2 DTC P0552, P0553: CHECK VOLTAGE BETWEEN VREF AND SIG RTN AT PSP SENSOR
Disconnect PSP sensor.
Key on, engine off.
Measure voltage between VREF and SIG RTN circuits at the PSP sensor harness connector. Is voltage between 4.0 and 6.0 volts?
Yes
.
No
.
DT3 CHECK PSP SENSOR OPERATION
Connect a jumper wire for the VREF circuit between the PSP sensor harness connector and sensor connector.
Connect jumper wire for the SIG RTN circuit between the PSP sensor harness connector and sensor connector.
Start engine and let idle.
Measure voltage between PSP circuit at the PSP sensor connector and chassis ground.
Observe voltage while turning the steering wheel at least one half turn right and left. Is voltage reading between 0.3 and 4.7 volts, and does the voltage change when the steering wheel is turned?
Yes
.
No
DT4 CHECK PSP SENSOR CIRCUIT FOR OPEN IN HARNESS
Disconnect PCM.
Measure resistance of PSP circuit between PCM harness connector pin 31 and PSP sensor harness connector. Is resistance less than 5.0 ohms?
Yes
.
No
DT5 CHECK PSP CIRCUIT FOR SHORT TO POWER IN HARNESS
Key on, engine off.
Measure voltage between PSP circuit at the PSP sensor harness connector and chassis ground. Is voltage less than 1.0 volt?
Yes
.
No
DT6 CHECK PSP CIRCUIT FOR SHORT TO VREF, SIG RTN AND GROUND IN HARNESS
Measure resistance between the PSP circuit and both the VREF and SIG RTN circuits at the PSP sensor harness connector.
Measure resistance between the PSP circuit at the PSP sensor harness connector and chassis ground. Is each resistance greater than 10,000 ohms?
Yes
No
DT10 CONTINUOUS MEMORY DTC P0552, P0553: CHECK FOR INTERMITTENT CIRCUITS TO PSP SENSOR
Key on, engine off.
Access PSP V PID.
Observe PSP V PID for an indication of a fault while performing the following (a fault will be indicated by a sudden change in the PSP V PID voltage):
Shake, wiggle, bend the PSP, SIG RTN and VREF circuits between the PSP sensor and the PCM.
Lightly tap on the PSP sensor to simulate road shock. Is a fault indicated?
Yes
ISOLATE fault and REPAIR as necessary. No
.