NISSAN PRIMERA 1999 Electronic Repair Manual

Component DescriptionNCEC0451The power steering oil pressure switch is attached to the power
steering high-pressure tube and detects a power steering load.
When a power steering load is detected, it signals the ECM. The
ECM adjusts the IACV-AAC valve to increase the idle speed and
adjust for the increased load.
CONSULT-II Reference Value in Data Monitor
Mode
NCEC0452Specification data are reference values.
MONITOR ITEM CONDITION SPECIFICATION
PW/ST SIGNALIEngine: After warming up, idle
the engineSteering wheel in neutral position
(forward direction)OFF
The steering wheel is fully turned ON
ECM Terminals and Reference ValueNCEC0453Specification data are reference values and are measured between each terminal and 48 (ECM ground).
TERMI-
NAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
46 PU/WPower steering oil pressure
switch[Engine is running]
ISteering wheel is fully turnedApproximately 0V
[Engine is running]
ISteering wheel is not turnedApproximately 5V
NEF124A Power steering oil pressure switch
POWER STEERING OIL PRESSURE SWITCHSR20DE
Component Description
EC-321

Wiring DiagramNCEC0450
YEC254
POWER STEERING OIL PRESSURE SWITCHSR20DE
Wiring Diagram
EC-322

Diagnostic Procedure=NCEC0454
1 INSPECTION START
Do you have CONSULT-II?
YesorNo
Ye s©GO TO 2.
No©GO TO 3.
2 CHECK OVERALL FUNCTION
With CONSULT-II
1. Start engine.
2. Check ªPW/ST SIGNALº in ªDATA MONITORº mode with CONSULT-II under the following conditions.
PEF591I
MTBL0141
OK or NG
OK©INSPECTION END
NG©GO TO 4.
3 CHECK OVERALL FUNCTION
Without CONSULT-II
1. Start engine.
2. Check voltage between ECM terminal 46 and ground under the following conditions.
SEF148X
MTBL0142
OK or NG
OK©INSPECTION END
NG©GO TO 4.
Steering is in neutral positionOFF
Steering is turnedON
Condition Voltage
When steering wheel is turned quicklyApproximately 0V
Except aboveApproximately 5V
CONNECT
POWER STEERING OIL PRESSURE SWITCHSR20DE
Diagnostic Procedure
EC-323

Component InspectionNCEC0455POWER STEERING OIL PRESSURE SWITCHNCEC0455S011. Disconnect power steering oil pressure switch harness con-
nector then start engine.
2. Check continuity between terminals 1 and 2.
Refer to wiring diagram.
Conditions Continuity
Steering wheel is being turnedYe s
Steering wheel is not being turnedNo
If NG, replace power steering oil pressure switch.
4 CHECK GROUND CIRCUIT
1. Turn ignition switch ªOFFº.
2. Disconnect power steering oil pressure switch harness connector.
3. Check harness continuity between power steering oil pressure switch harness terminal 2 and engine ground.
Refer to wiring diagram.
Continuity should exist.
4. 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 INPUT SIGNAL CIRCUIT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 46 and power steering oil pressure switch harness terminal 1.
Refer to wiring diagram.
Continuity should exist.
3. Also check harness for short to ground and short to power.
OK or NG
OK©GO TO 7.
NG©GO TO 6.
6 DETECT MALFUNCTIONING PART
Check the following.
IHarness connectors F4, E42
IHarness for open or short between ECM and power steering oil pressure switch
©Repair open circuit or short to ground or short to power in harness or connectors.
7 CHECK POWER STEERING OIL PRESSURE SWITCH
Refer to ªComponent Inspectionº, EC-SR-324.
OK or NG
OK©GO TO 8.
NG©Replace power steering oil pressure switch.
8 CHECK INTERMITTENT INCIDENT
Perform ªTROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENTº, EC-SR-114.
©INSPECTION END
POWER STEERING OIL PRESSURE SWITCHSR20DE
Component Inspection
EC-324

CONSULT-II Reference Value in Data Monitor
Mode
NCEC0548Specification data are reference values.
MONITOR ITEM CONDITION SPECIFICATION
LOAD SIGNALIEngine: runningRear window defogger or head-
lamp ªONºON
Except the above OFF
HEATER FAN SWIIgnition switch: ONHeater fan switch: ON ON
Heater fan switch: OFF OFF
ECM Terminals and Reference ValueNCEC0549Specification data are reference values and are measured between each terminal and 48 (ECM ground).
TER-
MINAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
50 R Electric load signal[Engine is running]
IHeadlamp switch or rear window defogger switch
is ªONºBATTERY VOLTAGE
(11 - 14V)
51 LG/B Blower fan SW[Ignition switch ªONº]
IBlower fan switch is ªONºApproximately 0V
[Ignition switch ªONº]
IBlower fan switch is ªOFFºApproximately 5V
ELECTRICAL LOAD SIGNALSR20DE
CONSULT-II Reference Value in Data Monitor Mode
EC-325

Wiring DiagramNCEC0550
YEC255
ELECTRICAL LOAD SIGNALSR20DE
Wiring Diagram
EC-326

DIODE TYPE - 1
YEC853
ECM: Detectable line for DTC
: Non-detectable line for DTC
: With XENON headlamp or daytime light system
: Except
HD
: Hyper CVT models
: M/T models
OFFFUSE
BLOCK
(J/B)
REFER TO THE FOLLOWING
FUSE BLOCK -
Junction Box (J/B)
: This connector is not shown in ªHARNESS LAYOUTº of EL section.2ND
1ST
LOW
HIGHPASSCOMBINATION
SWITCH
(LIGHTING
SWITCH)With XENON headlamp...R/W
Except XENON headlamp...G
With daytime light system...1
Without daytime light system...2
With daytime light system...2
Without daytime light system...1 To
EL-DEF
TIME
CONTROL
UNIT
DIODETo EL-H/LAMP Refer to
EL-POWER.
Headlamp
relay LH
To
EL-LAMP With daytime light system and
with XENON headlamp...R/l
With daytime light system and
without XENON headlamp...P/B
Without daytime light system...OR/L
ELECTRICAL LOAD SIGNALSR20DE
Wiring Diagram (Cont'd)
EC-327

DIODE TYPE - 2
YEC095A
ELECTRICAL LOAD SIGNALSR20DE
Wiring Diagram (Cont'd)
EC-328

Wiring DiagramNCEC0466
YEC096A
MI & DATA LINK CONNECTORSSR20DE
Wiring Diagram
EC-329

Fuel Pressure RegulatorNCEC0467
Fuel pressure at idling
kPa (bar, kg/cm2, psi)Vacuum hose is connected Approximately 235 (2.35, 2.4, 34)
Vacuum hose is disconnected Approximately 294 (2.94, 3.0, 43)
Idle Speed and Ignition TimingNCEC0468
Target idle speed*1 rpm No-load*3 (in ªPº or ªNº position) 750 50
Air conditioner: ON rpm In ªPº or ªNº position 825 or more
Ignition timing*2 In ªPº or ªNº position 15É 2É BTDC
Throttle position sensor idle position V0.35 - 0.65
*1: Throttle position sensor harness connector connected
*2: Throttle position sensor harness connector disconnected
*3: Under the following conditions:
IAir conditioner switch: OFF
IElectrical load: OFF (Lights, heater fan & rear window defogger)
ISteering wheel: Kept in straight-ahead position
Ignition CoilNCEC0574
Primary voltage VBattery voltage (11 - 14)
Primary resistance [at 25ÉC (77ÉF)] kW2.2
Secondary resistance [at 25ÉC (77ÉF)] kWApproximately 17
Mass Air Flow SensorNCEC0470
Supply voltage (Heater) VBattery voltage (11 - 14)
Supply voltage (Sensor) VApproximately 5
Output voltage V1.3 - 1.7*
Mass air flow
(Using CONSULT-II or GST) g×m/sec2.5 - 5.0 at idle*
7.1 - 12.5 at 2,500 rpm*
*: Engine is warmed up to normal operating temperature and idling under no-load.
Engine Coolant Temperature SensorNCEC0471
Temperature ÉC (ÉF) Resistance kW
20 (68) 2.1 - 2.9
50 (122) 0.68 - 1.00
90 (194) 0.236 - 0.260
Fuel PumpNCEC0473
Resistance [at 25ÉC (77ÉF)]W0.2 - 5.0
IACV-AAC ValveNCEC0474
Resistance [at 20ÉC (68ÉF)]W
Between terminals1-2,2-3,4-5and5-620-24
InjectorNCEC0475
Resistance [at 25ÉC (77ÉF)]W13.5 - 17.5
SERVICE DATA AND SPECIFICATIONS (SDS)
Fuel Pressure Regulator
EC-330