1998 NISSAN PICK-UP Repair Manual

ENGINE COOLANT TEMPERATURE SENSOR
Disconnect engine coolant temperature harness connector and
measure resistance.
Coolant temp. ÉC (ÉF) Resistance kW
þ25 (þ13) 19
0 (32) 5.6
20 (68) 2.5
40 (104) 1.2
DEF020
QUICK-GLOW SYSTEMTD
Component Inspection (Cont'd)
EC-209

Component Parts Location
DEC024
EGR SYSTEMTD
EC-210

Description
The EGR system is designed to control the formation of NOx emission by recirculating the exhaust gas into
the intake manifold passage through the EGR valve.
For electrical circuit of the EGR system, refer to ``Circuit Diagram'' in ``QUICK-GLOW SYSTEM'', EC-195.
DEC025
EGR SYSTEMTD
EC-211

Operation
Coolant
temperature
ÉC (ÉF)Engine load
(EGR area)EGRC-solenoid valve
EGR valveThrottle chamber
control valveAmount of EGR
gas
AB
Below 60 (140) All OFF (Closed) OFF (Closed) Closed Open Ð
Above 60 (140)Low load
(Area
V1)ON (Open) ON (Open) Open Nearly closed High
Middle load
(Area
V2)OFF (Closed) ON (Open) Open Open Low
High load*1
(Area
V3)OFF (Closed) OFF (Closed) Closed Open Ð
*1: Also includes conditions, in which the engine is stopped with the ignition switch ON or the atmospheric pressure is below 90.0
kPa (900 mbar, 675 mmHg, 26.57 inHg).
DEC026
EGR SYSTEMTD
EC-212

Wiring Diagram
TD25 ENGINE (LHD)
HEC579
EGR SYSTEMTD
EC-213

TD25 ENGINE (LHD)
HEC580
EGR SYSTEMTD
Wiring Diagram (Cont'd)
EC-214

TD25 ENGINE (RHD)
HEC581
EGR SYSTEMTD
Wiring Diagram (Cont'd)
EC-215

TD25 ENGINE (RHD)
HEC582
EGR SYSTEMTD
Wiring Diagram (Cont'd)
EC-216