Nissan Frontier D40. Manual — part 396
P0507 ISC SYSTEM
EC-275
< COMPONENT DIAGNOSIS >
[QR25DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
OK
>> GO TO 3.
NG
>> Discover air leak location and repair.
3.
REPLACE ECM
1.
Stop engine.
2.
Replace ECM.
3.
Perform initialization of NVIS (NATS) system and registration of all NVIS (NATS) ignition key IDs. Refer to
SEC-7, "ECM RE-COMMUNICATING FUNCTION : Special Repair Requirement"
.
4.
5.
EC-24, "Accelerator Pedal Released Position Learning"
6.
EC-24, "Throttle Valve Closed Position Learning"
.
7.
EC-24, "Idle Air Volume Learning"
>> INSPECTION END
EC-276
< COMPONENT DIAGNOSIS >
[QR25DE]
P0550 PSP SENSOR
P0550 PSP SENSOR
Component Description
INFOID:0000000005273282
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.
On Board Diagnosis Logic
INFOID:0000000005273283
The MIL will not light up for this diagnosis.
NOTE:
If DTC P0550 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to
.
DTC Confirmation Procedure
INFOID:0000000005273284
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
WITH CONSULT-III
1.
Start engine and let it idle for at least 5 seconds.
2.
Check 1st trip DTC.
3.
If 1st trip DTC is detected, go to
WITH GST
Follow the procedure “WITH CONSULT-III” above.
Diagnosis Procedure
INFOID:0000000005273285
1.
CHECK GROUND CONNECTIONS
1.
Turn ignition switch OFF.
2.
Loosen and retighten two ground screws on the body. Refer to
.
OK or NG
OK
>> GO TO 2.
BBIA0621E
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0550
0550
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
BBIA0614E
P0550 PSP SENSOR
EC-277
< COMPONENT DIAGNOSIS >
[QR25DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
NG
>> Repair or replace ground connections.
2.
CHECK PSP SENSOR POWER SUPPLY CIRCUIT
1.
Disconnect power steering pressure (PSP) sensor harness con-
nector.
2.
Turn ignition switch ON.
3.
Check voltage between PSP sensor terminal 3 and ground with
CONSULT-III or tester.
OK or NG
OK
>> GO TO 3.
NG
>> Repair open circuit, 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 harness continuity between PSP sensor terminal 1 and ECM terminal 67.
Refer to Wiring Diagram.
4.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 4.
NG
>> Repair open circuit, short to ground or short to power in harness or connectors.
4.
CHECK PSP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Check harness continuity between ECM terminal 12 and PSP sensor terminal 2.
Refer to Wiring Diagram.
2.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 5.
NG
>> Repair open circuit, short to ground or short to power in harness or connectors.
5.
CHECK PSP SENSOR
EC-278, "Component Inspection"
OK or NG
OK
>> GO TO 6.
NG
>> Replace PSP sensor.
6.
CHECK INTERMITTENT INCIDENT
GI-46, "Intermittent Incident"
.
BBIA0621E
Voltage: Approximately 5V
SEF479Y
Continuity should exist.
Continuity should exist.
EC-278
< COMPONENT DIAGNOSIS >
[QR25DE]
P0550 PSP SENSOR
>> INSPECTION END
Component Inspection
INFOID:0000000005273286
POWER STEERING PRESSURE SENSOR
1.
Reconnect all harness connectors disconnected.
2.
Start engine and let it idle.
3.
Check voltage between ECM terminal 12 and ground under the
following conditions.
Condition
Voltage
Steering wheel: Being turned
0.5 - 4.5V
Steering wheel: Not being turned
0.4 - 0.8V
MBIB0025E
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