1999 NISSAN PICK-UP low oil pressure

ENGINECONTROLSYSTEM
SECTION
EC
MODIFICATION NOTICE:
Gasoline engine
Diesel engine
lWiring diagrams have been changed.
CONTENTS
PRECAUTIONS AND PREPARATION ............... 2003
Supplemental Restraint System (SRS) ``AIR
BAG'' and ``SEAT BELT PRE-TENSIONER'' .. 2003
KA24E
ENGINE AND EMISSION CONTROL OVERALL
SYSTEM............................................................... 2004
Circuit Diagram ................................................ 2004
TROUBLE DIAGNOSIS FOR POWER
SUPPLY ............................................................... 2005
Main Power Supply and Ground Circuit .......... 2005
TROUBLE DIAGNOSIS FOR ``CAMSHAFT
POSI SEN'' (DTC 11) ........................................... 2007
Camshaft Position Sensor (CMPS) ................. 2007
TROUBLE DIAGNOSIS FOR ``MASS AIR FLOW
SEN'' (DTC 12) .................................................... 2008
Mass Air Flow Sensor (MAFS) ........................ 2008
TROUBLE DIAGNOSIS FOR
NON-DETECTABLE ITEMS ................................ 2009
Vehicle Speed Sensor (VSS) .......................... 2009
Heated Oxygen Sensor (HO2S)
- LHD Models - ................................................ 2010
Idle Air Control Valve (IACV) - Auxiliary Air
Control (AAC) Valve ........................................ 2011 Park/Neutral Position Switch ........................... 2012
EVAP Canister Purge Control Solenoid
Valve ................................................................ 2013
Start Signal ...................................................... 2014
Fuel Pump........................................................ 2015
Power Steering Oil Pressure Switch ............... 2016
Swirl Control Valve Control Solenoid Valve .... 2017
IACV-FICD Solenoid Valve .............................. 2018
MIL & Data Link Connectors ........................... 2019
TD
QUICK-GLOW SYSTEM ...................................... 2020
Circuit Diagram ................................................ 2020
Wiring Diagram ................................................ 2021
EGR SYSTEM ...................................................... 2027
Wiring Diagram ................................................ 2027
SOLENOID TIMER .............................................. 2031
Wiring Diagram ................................................ 2031
FUEL HEATER SYSTEM .................................... 2033
Wiring Diagram ................................................ 2033
FAST IDLE CONTROL CIRCUIT ........................ 2034
Wiring Diagram ................................................ 2034
EC

Use the chart below to find out what each wiring diagram code
stands for.
Refer to the wiring diagram code in the alphabetical index to find
the location (page number) of each wiring diagram.
Code Section Wiring Diagram Name
AAC/V EC IACV-AAC Valve
ABS BR Anti-lock Brake System
A/C, M HA Manual Air Conditioner
A/C, A HA Auto Air Conditioner
AT/IND EL A/T Indicator
AUDIO EL Audio
BACK/L EL Back-up Lamp
BA/FTS ATBATT/A/T Fluid Temperature Sensor
and TCM Power Supply
CHARGE EL Charging System
CHIME EL Warning Chime
CHOKE EC Automatic Choke
CIGAR EL Cigarette Lighter
CLOCK EL Clock
CMPS EC Camshaft Position Sensor
COOL/F LC Cooling Fan Control
DEF ELRear Window Defogger and Mirror
Defogger
DIMDIP ELHeadlamp Ð With Dim-dip Lamp
System
D/LOCK EL Power Door Lock
DTRL ELHeadlamp Ð With Daytime Light
System
ECTS ECEngine Coolant Temperature
Sensor
EGRC/V EC EGRC Ð Solenoid Valve
ENGSS AT Engine Speed Signal
FCUT EC Fuel Cut Solenoid Valve
F/HEAT EC Fuel Heater System
FICD EC IACV-FICD Solenoid Valve
FIPOT EC ISC-FI Pot
FPCM EC Fuel Pump Control Module
F/PUMP EC Fuel Pump
GLOW EC Quick-glow System
H/AIM EL Headlamp Aiming Control
HEATER HA Heater
H/LAMP EL Headlamp
HLC EL Headlamp Washer
HO2S EC Heated Oxygen Sensor
HORN EL Horn
H/SEAT EL Heated SeatCode Section Wiring Diagram Name
IGN EC Ignition System
IGN/SG EC Ignition Signal
ILL EL Illumination
INJECT EC Injector
INT/L EL Spot Lamp
KS EC Knock Sensor
LOAD EC Electric Load Signal
LPSV AT Line Pressure Solenoid Valve
MAFS EC Mass Air Flow Sensor
MAIN EC, ATMain Power Supply and Ground Cir-
cuit
METER ELSpeedometer, Tachometer, Temp.
and Fuel Gauges
MIL/DL ECMIL and Data Link Connector For
CONSULT
MIRROR EL Power Door Mirror
MULTI EL Multi-remote Control System
NATS EL Nissan Anti-theft System
NONDTC AT Non-detectable Items
OVRCSV AT Overrun Clutch Solenoid Valve
P/ANT EL Power Antenna
PGC/V ECEVAP Canister Purge
Control Solenoid Valve
PLA EC Partial Load Advance Control
PNP/SW EC Park/Neutral Position Switch
POWER EL Power Supply Routing
PST/SW EC Power Steering Oil Pressure Switch
R/FOG EL Rear Fog Lamp
ROOM/L EL Interior Room Lamp
SHIFT AT Shift Lock System
SSV/A AT Shift Solenoid Valve A
SSV/B AT Shift Solenoid Valve B
SRS RS Supplemental Restraint System
S/SIG EC Start Signal
START EL Starting System
STOP/L EL Stop Lamp
SWL/V ECSwirl Control Valve Control Solenoid
Valve
TAIL/L EL Parking, License and Tail Lamps
TCV ATTorque Converter Clutch Solenoid
Valve
WIRING DIAGRAM CODES (CELL CODES)
EL-2171

Use the chart below to find out what each wiring diagram code
stands for.
Refer to the wiring diagram code in the alphabetical index to find
the location (page number) of each wiring diagram.
Code Section Wiring Diagram Name
AAC/V EC IACV-AAC Valve
ABS BR Anti-lock Brake System
A/C, M HA Manual Air Conditioner
A/C, A HA Auto Air Conditioner
AT/IND EL A/T Indicator
AUDIO EL Audio
BACK/L EL Back-up Lamp
BA/FTS ATBATT/A/T Fluid Temperature Sensor
and TCM Power Supply
CHARGE EL Charging System
CHIME EL Warning Chime
CHOKE EC Automatic Choke
CIGAR EL Cigarette Lighter
CLOCK EL Clock
CMPS EC Camshaft Position Sensor
COOL/F LC Cooling Fan Control
DEF ELRear Window Defogger and Mirror
Defogger
DIMDIP ELHeadlamp Ð With Dim-dip Lamp
System
D/LOCK EL Power Door Lock
DTRL ELHeadlamp Ð With Daytime Light
System
ECTS ECEngine Coolant Temperature
Sensor
EGRC/V EC EGRC Ð Solenoid Valve
ENGSS AT Engine Speed Signal
FCUT EC Fuel Cut Solenoid Valve
F/HEAT EC Fuel Heater System
FICD EC IACV-FICD Solenoid Valve
FIPOT EC ISC-FI Pot
FPCM EC Fuel Pump Control Module
F/PUMP EC Fuel Pump
GLOW EC Quick-glow System
H/AIM EL Headlamp Aiming Control
HEATER HA Heater
H/LAMP EL Headlamp
HLC EL Headlamp Washer
HO2S EC Heated Oxygen Sensor
HORN EL Horn
H/SEAT EL Heated SeatCode Section Wiring Diagram Name
IGN EC Ignition System
IGN/SG EC Ignition Signal
ILL EL Illumination
INJECT EC Injector
INT/L EL Spot Lamp
KS EC Knock Sensor
LOAD EC Electric Load Signal
LPSV AT Line Pressure Solenoid Valve
MAFS EC Mass Air Flow Sensor
MAIN EC, ATMain Power Supply and Ground Cir-
cuit
METER ELSpeedometer, Tachometer, Temp.
and Fuel Gauges
MIL/DL ECMIL and Data Link Connector For
CONSULT
MIRROR EL Power Door Mirror
MULTI EL Multi-remote Control System
NATS EL Nissan Anti-theft System
NONDTC AT Non-detectable Items
OVRCSV AT Overrun Clutch Solenoid Valve
P/ANT EL Power Antenna
PGC/V ECEVAP Canister Purge
Control Solenoid Valve
PLA EC Partial Load Advance Control
PNP/SW EC Park/Neutral Position Switch
POWER EL Power Supply Routing
PST/SW EC Power Steering Oil Pressure Switch
R/FOG EL Rear Fog Lamp
ROOM/L EL Interior Room Lamp
SHIFT AT Shift Lock System
SSV/A AT Shift Solenoid Valve A
SSV/B AT Shift Solenoid Valve B
SRS RS Supplemental Restraint System
S/SIG EC Start Signal
START EL Starting System
STOP/L EL Stop Lamp
SWL/V ECSwirl Control Valve Control Solenoid
Valve
TAIL/L EL Parking, License and Tail Lamps
TCV ATTorque Converter Clutch Solenoid
Valve
WIRING DIAGRAM CODES (CELL CODES)
EL-2171

Measurement of Compression Pressure
1. Warm up engine.
2. Turn ignition switch OFF.
3. Release fuel pressure.
Refer to EC section (ªFuel Pressure Releaseº, ªBASIC SER-
VICE PROCEDUREº).
4. Remove all spark plugs.
lClean area around the plug with compressed air before
removing the spark plug.
5. Disconnect camshaft position sensor harness connector at
the distributor.
6. Disconnect all fuel injector harness connectors.
7. Attach a compression tester to No. 1 cylinder.
8. Depress accelerator pedal fully to keep throttle valve wide
open.
9. Crank engine and record highest gauge indication.
10. Repeat the measurement on each cylinder as shown above.
lAlways use a fully-charged battery to obtain specified
engine speed.
Compression pressure: kPa (bar, kg/cm
2, psi)/rpm
Standard
1,226 (12.26, 12.5, 178)/300
Minimum
1,030 (10.30, 10.5, 149)/300
Difference limit between cylinders
98 (0.98, 1.0, 14)/300
11. If compression in one or more cylinders is low:
a. Pour a small amount of engine oil into cylinders through
spark plug holes.
b. Retest compression.
lIf adding oil improves cylinder compression, piston
rings may be worn or damaged. If so, replace piston
rings after checking piston.
lIf pressure stays low, a valve may be sticking or seating
improperly. Inspect and repair valve and valve seat.
(Refer to SDS, EM-2049 and EM-2051.) If valve or valve
seat is damaged excessively, replace it.
lIf compression stays low in two cylinders that are next
to each other:
a. The cylinder head gasket may be leaking, or
b. Both cylinders may have valve component damage.
Inspect and repair as necessary.
12. Reconnect fuel pump fuse, all fuel injector harness
connectors, and the camshaft position sensor harness con-
nector at the distributor, and then reinstall spark plugs.
SEF215P
SEM486D
COMPRESSION PRESSUREKA24DE
EM-2010

Wiring Diagram Codes (Cell Codes)
Use the chart below to find out what each wiring diagram code
stands for.
Refer to the wiring diagram code in the alphabetical index to find
the location (page number) of each wiring diagram.
Code Section Wiring Diagram Name
AAC/V EC IACV-AAC Valve
ABS BR Anti-lock Brake System
A/C HA Air Conditioner
AUDIO EL Audio
BACK/L EL Back-up Lamp
BUZZER EL Warning Buzzer
CHARGE EL Charging System
CHOKE EC Automatic Choke
CMPS EC Camshaft Position Sensor
COOL/F LC Cooling Fan Control
DEF EL Rear Window Defogger
D/LOCK EL Power Door Lock
ECTS ECEngine Coolant Temperature
Sensor
PGC/V ECCanister Purge
Control Solenoid Valve
FCUT EC Fuel Cut Solenoid Valve
FICD EC IACV-FICD Solenoid Valve
FIPOT EC ISC-FI Pot
FPCM EC Fuel Pump Control Module
F/PUMP EC Fuel Pump
F/RTN EC Fuel Return Control Solenoid Valve
GLOW EC Quick-glow System
H/LAMP EL Headlamp
HEAT HA Heater
HO2S EC Heated Oxygen Sensor
HORN EL Horn, Cigarette Lighter, Clock
IATS EC Intake Air Temperature Sensor
IDLE EC IACV-Idle Up Control
IGN EC Ignition System
IGN/SG EC Ignition SignalCode Section Wiring Diagram Name
ILL EL Illumination
INJECT EC Injector
INT/L EL Interior and Spot Lamps
MAFS EC Mass Air Flow Sensor
MAIN ECMain Power Supply and Ground Cir-
cuit
METER ELSpeedometer, Tachometer, Temp.
and Fuel Gauges
MIL/DL ECMIL and Data Link Connector For
CONSULT
MIRROR EL Power Door Mirror
P/ANT EL Power Antenna
PLA EC Partial Load Advance Control
PNP/SW EC Park/Neutral Position Switch
POWER EL Power Supply Routing
PST/SW EC Power Steering Oil Pressure Switch
SRS RS Supplemental Restraint System
S/SIG EC Start Signal
START EL Starting System
STOP/L EL Stop Lamp
SWL/V ECSwirl Control Valve Control Solenoid
Valve
TAIL/L EL Parking, License and Tail Lamps
TPS EC Throttle Position Sensor
TURN ELTurn Signal and Hazard Warning
Lamps
VSS EC Vehicle Speed Sensor
WARN EL Warning Lamps
WINDOW EL Power Window
WIPER EL Front Wiper and Washer
HOW TO READ WIRING DIAGRAMS
GI-2003