Nissan Xterra. Instruction — part 308
EC-358
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
P0550 PSP SENSOR
P0550 PSP SENSOR
Component Description
INFOID:0000000009484073
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:0000000009484074
The MIL will not illuminate 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:0000000009484075
1. If DTC Confirmation Procedure has been previously conducted, always perform the following before con-
ducting the next step.
a. Turn ignition switch OFF and wait at least 10 seconds.
b. Turn ignition switch ON.
c.
Turn ignition switch OFF and wait at least 10 seconds.
2. Start engine and let it idle for at least 5 seconds.
3. Check 1st trip DTC.
4. If 1st trip DTC is detected, go to
Diagnosis Procedure
INFOID:0000000009484076
1.
CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body. Refer to
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
BBIA0552E
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
BBIA0539E
P0550 PSP SENSOR
EC-359
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
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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 or tester.
OK or NG
OK
>> GO TO 3.
NG
>> 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 harness continuity between PSP sensor terminal 1 and ECM terminal 72.
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 or 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 65 and PSP sensor terminal 2.
2. Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 5.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
5.
CHECK PSP SENSOR
EC-359, "Component Inspection"
OK or NG
OK
>> GO TO 6.
NG
>> Replace PSP sensor. Refer to
ST-19, "Removal and Installation"
6.
CHECK INTERMITTENT INCIDENT
GI-40, "Intermittent Incident"
.
>> INSPECTION END
Component Inspection
INFOID:0000000009484077
POWER STEERING PRESSURE SENSOR
1. Reconnect all harness connectors disconnected.
2. Start engine and let it idle.
3. Check voltage between ECM terminal 65 and ground under the following conditions.
Voltage: Approximately 5V
BBIA0552E
Continuity should exist.
Continuity should exist.
EC-360
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
P0550 PSP SENSOR
Condition
Voltage
Steering wheel: being turned
0.5 - 4.5V
Steering wheel: not being turned
0.4 - 0.8V
P0603 ECM POWER SUPPLY
EC-361
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
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P0603 ECM POWER SUPPLY
Component Description
INFOID:0000000009484078
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 memory, the idle air vol-
ume learning value memory, etc.
On Board Diagnosis Logic
INFOID:0000000009484079
DTC Confirmation Procedure
INFOID:0000000009484080
1. If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next step.
a. Turn ignition switch OFF and wait at least 10 seconds.
b. Turn ignition switch ON.
c. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON, wait at least 10 seconds.
3. Turn ignition switch OFF, wait at least 5 minutes.
4. Turn ignition switch ON, wait at least 10 seconds.
5. Repeat steps 2 to 3 for 5 times.
6. Check 1st trip DTC.
7. If 1st trip DTC is detected, go to
Diagnosis Procedure
INFOID:0000000009484081
1.
CHECK ECM POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check voltage between ECM terminal 26 and ground with CONSULT or tester.
OK or NG
OK
>> GO TO 3.
NG
>> GO TO 2.
2.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connector F32, E2
• 20 A fuse (No. 53)
• IPDM E/R harness connector E121
• Harness for open or short between ECM and battery
PBIB1164E
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0603
0603
ECM power supply cir-
cuit
ECM back up RAM system does not function
properly.
• Harness or connectors
[ECM power supply (back up) circuit is
open or shorted.]
• ECM
Voltage: Battery voltage
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