Infiniti Q45. Manual — part 461
DTC P0550 PSP SENSOR
EC-483
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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 1 and ground with
CONSULT-II or tester.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 3.
3.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors F5, E315
●
Harness for open or short between ECM and PSP sensor
>> Repair open circuit or short to ground or short to power in harness or connectors.
4.
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 3 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 6.
NG
>> GO TO 5.
5.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors F5, E315
●
Harness for open or short between PSP sensor and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.
PBIB0027E
Voltage: Approximately 5V
PBIB0188E
Continuity should exist.
EC-484
DTC P0550 PSP SENSOR
6.
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 8.
NG
>> GO TO 7.
7.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors F5, E315
●
Harness for open or short between ECM and PSP sensor
>> Repair open circuit or short to ground or short to power in harness or connectors.
8.
CHECK PSP SENSOR
Refer to
EC-484, "Component Inspection"
OK or NG
OK
>> GO TO 9.
NG
>> Replace PSP sensor.
9.
CHECK INTERMITTENT INCIDENT
Refer to
EC-145, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
.
>> INSPECTION END
Component Inspection
NBS001Z1
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.
Removal and Installation
NBS001Z2
POWER STEERING PRESSURE SENSOR
Refer to
Continuity should exist.
Condition
Voltage
Steering wheel: Being turned.
0.5 - 4.5V
Steering wheel: Not being turned.
0.4 - 0.8V
MBIB0126E
DTC P0603 ECM POWER SUPPLY
EC-485
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DTC P0603 ECM POWER SUPPLY
PFP:23710
Component Description
NBS001Z7
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
NBS001Z8
DTC Confirmation Procedure
NBS001Z9
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-II
1.
Turn ignition switch ON and wait at least 1 second.
2.
Select “DATA MONITOR” mode with CONSULT-II.
3.
Start engine and let it idle for 1 second.
4.
Turn ignition switch OFF, wait at least 10 seconds, and then turn
ON.
5.
Repeat steps 3 and 4 for 4 times.
6.
If 1st trip DTC is detected, go to
EC-487, "Diagnostic Procedure"
.
WITH GST
Follow the procedure “WITH CONSULT-II” above.
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.]
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ECM
SEF058Y
EC-486
DTC P0603 ECM POWER SUPPLY
Wiring Diagram
NBS001ZA
TBWM0557E
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