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:
Around View Monitor system limitations
WARNING
Listed below are the system limitations for
Around View Monitor. Failure to operate
the vehicle in accordance with these system
limitations could result in serious injury
or death.
Do not use the Around View Monitor
with the outside mirrors in the stored
position, and make ...
Basic inspection
DIAGNOSIS AND REPAIR WORKFLOW
Work Flow (With EXP-800 NI or GR8-1200 NI)
CHARGING SYSTEM DIAGNOSIS WITH EXP-800 NI OR GR8-1200 NI
To test the charging system, use the following special service tools:
EXP-800 NI Battery and electrical diagnostic analyzer
GR8-1200 NI Multitasking battery and ...
P1726 throttle control signal
Description
The electric throttle control actuator consists of
throttle control motor, accelerator pedal position sensor, throttle
position sensor, etc. The actuator sends a signal to the ECM, and ECM sends the
signal to TCM via CAN
communication.
DTC Logic
DTC DETECTION LOGIC
DTC CONF ...
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
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