Nissan Altima L32. Instruction — part 308
P0507 ISC SYSTEM
EC-353
< COMPONENT DIAGNOSIS >
[QR25DE FOR CALIFORNIA]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
Is intake air leak detected?
YES
>> Discover air leak location and repair.
NO
>> GO TO 3.
3.
REPLACE ECM
1. Stop engine.
2. Replace ECM.
3. Go to
EC-27, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Require-
.
>> INSPECTION END
EC-354
< COMPONENT DIAGNOSIS >
[QR25DE FOR CALIFORNIA]
P0550 PSP SENSOR
P0550 PSP SENSOR
Description
INFOID:0000000004349388
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
INFOID:0000000004349389
DTC DETECTION LOGIC
NOTE:
If DTC P0550 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and let it idle for at least 5 seconds.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000004349390
1.
CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in
.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace ground connection.
2.
CHECK PSP SENSOR POWER SUPPLY CIRCUIT
1. Disconnect power steering pressure (PSP) sensor harness connector.
2. Turn ignition switch ON.
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0550
Power steering pressure
sensor circuit
An excessively low or high voltage from the
sensor is sent to ECM.
• Harness or connectors
(The sensor circuit is open or shorted)
• Power steering pressure sensor
P0550 PSP SENSOR
EC-355
< COMPONENT DIAGNOSIS >
[QR25DE FOR CALIFORNIA]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
3. Check the voltage between PSP sensor harness connector and
ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair open circuit or short to ground or short to power
in harness or connectors.
3.
CHECK PSP SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between PSP sensor harness connector and ECM harness connector.
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair open circuit or short to ground short to power in harness or connectors.
4.
CHECK PSP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check the continuity between PSP sensor harness connector and ECM harness connector.
2. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair open circuit or short to ground or short to power in harness or connectors.
5.
CHECK PSP SENSOR
EC-355, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Replace PSP sensor.
6.
CHECK INTERMITTENT INCIDENT
GI-42, "Intermittent Incident"
.
>> INSPECTION END
Component Inspection
INFOID:0000000004349391
1.
CHECK POWER STEERING PRESSURE SENSOR
1. Turn ignition switch OFF.
2. Reconnect all harness connectors disconnected.
3. Start engine and let it idle.
PSP sensor
Ground
Voltage
Connector Terminal
F40
1
Ground
Approx. 5 V
JMBIA1596ZZ
PSP sensor
ECM
Continuity
Connector Terminal Connector Terminal
F40
3
F13
48
Existed
PSP sensor
ECM
Continuity
Connector Terminal Connector Terminal
F40
2
F13
41
Existed
EC-356
< COMPONENT DIAGNOSIS >
[QR25DE FOR CALIFORNIA]
P0550 PSP SENSOR
4. Check the voltage between ECM harness connector and ground
under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace power steering pressure sensor.
ECM
Condition
Voltage
Connector
Terminal
F13
41
(Power steering pres-
sure sensor signal)
Steering
wheel
Being turned.
0.5 - 4.5 V
Not being
turned.
0.4 - 0.8 V
JMBIA1597ZZ
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