Nissan Maxima Service and Repair Manual: P0550 PSP sensor
Description
Power steering pressure (PSP) sensor is installed to the power steering high-pressure tube and detects a power steering load.
This sensor is a potentiometer which transforms the power steering load into output voltage, and emits the voltage signal to the ECM. The ECM controls the electric throttle control actuator and adjusts the throttle valve opening angle to increase the engine speed and adjusts the idle speed for the increased load.
DTC Logic
DTC DETECTION LOGIC
NOTE: If DTC P0550 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to EC-394, "DTC Logic".
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next test.
- Turn ignition switch OFF and wait at least 10 seconds.
- Turn ignition switch ON.
- Turn ignition switch OFF and wait at least 10 seconds.
2.PERFORM DTC CONFIRMATION PROCEDURE
- Start engine and let it idle for at least 5 seconds.
- Check 1st trip DT
Diagnosis Procedure
1.CHECK GROUND CONNECTION
- Turn ignition switch OFF.
- Check ground connection E9.
2.CHECK PSP SENSOR POWER SUPPLY CIRCUIT
- Disconnect power steering pressure (PSP) sensor harness connector.
- Turn ignition switch ON.
- Check the voltage between PSP sensor harness connector and ground.
3.CHECK PSP SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
- Turn ignition switch OFF.
- Disconnect ECM harness connector.
- Check the continuity between PSP sensor harness connector and ECM harness connector.
- Also check harness for short to ground and short to power.
4.CHECK PSP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
- Check the continuity between PSP sensor harness connector and ECM harness connector.
- Also check harness for short to ground and short to power.
5.CHECK PSP SENSOR
6.CHECK INTERMITTENT INCIDENT
Component Inspection
1.CHECK POWER STEERING PRESSURE SENSOR
- Reconnect all harness connectors disconnected.
- Start engine and let it idle.
- Check the voltage between ECM terminals under the following conditions.
P050A, P050e cold start control
Description
ECM controls ignition timing and engine idle speed when engine is started
with pre-warming up condition.
This control promotes the activation of three way catalyst by heating the
c ...
P0603 ECM power supply
Description
Battery voltage is supplied to the ECM even when the ignition switch
is turned OFF for the ECM memory function of the DTC memory, the
air-fuel ratio feedback compensation value me ...
Other materials:
Front wiper auto stop signal circuit
Component Function Check
1. CHECK FRONT WIPER (AUTO STOP) OPERATION
CONSULT DATA MONITOR
Select "WIP AUTO STOP" of IPDM E/R DATA MONITOR item.
Operate the front wiper.
With the front wiper operation, check the monitor status.
Diagnosis Procedure
1. CHECK IPDM E/R OUTPUT VOLTAGE
...
Heated seat switches (if so equipped)
The front seats are warmed by built-in heaters.
1. Start the engine.
2. Push the LO or HI position of the switch, as
desired. The indicator light in the switch will
illuminate.
The heater is controlled by a thermostat,
automatically turning the heater on and off.
The indicator light ...
Headlight control switch
Lighting
Rotate the switch to the
position, and
the front parking, tail, license plate, and instrument
panel lights will come on.
Rotate the switch to the
position, and
the headlights will come on and all the other
lights remain on.
CAUTION
Use the headlights with the e ...
Nissan Maxima Owners Manual
- Illustrated table of contents
- Safety-Seats, seat belts and supplemental restraint system
- Instruments and controls
- Pre-driving checks and adjustments
- Monitor, climate, audio, phone and voice recognition systems
- Starting and driving
- In case of emergency
- Appearance and care
- Do-it-yourself
- Maintenance and schedules
- Technical and consumer information
Nissan Maxima Service and Repair Manual
0.0069