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:
Diagnosis system (AV control unit)
Description
The AV control unit diagnosis function starts up with multifunction
switch operation and the AV control unit
performs a diagnosis for each unit in the system during the on board
diagnosis.
Perform a CONSULT diagnosis if the on board diagnosis does not start,
e.g., the s ...
Symptom diagnosis
ADP SYSTEM SYMPTOMS
Symptom Table
SYMPTOM 1
SYMPTOM 2
SYMPTOM 3
SYMPTOM 4
SYMPTOM 5
NORMAL OPERATING CONDITION
Description
The following symptoms are normal operations, and they do not indicate a
malfunction.
...
Basic inspection
DIAGNOSIS AND REPAIR WORKFLOW
Work Flow
DETAILED FLOW
1.COLLECT THE INFORMATION FROM THE CUSTOMER
It is also important to clarify customer complaints before inspection. First
of all, reproduce symptoms, andunderstand them fully. Ask customer about
his/her complaints carefully. In some cases, ...
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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