Nissan Terrano model r20 series 2004. Instruction — part 183
System Description
EGR CONTROL
Camshaft position sensor (TDC)
E
Engine speed
ECM
E
EGRC-solenoid valve A
Mass air flow sensor
E
Mass air flow
E
EGRC-solenoid valve B
Engine coolant temperature sensor
E
Engine coolant temperature
E
Throttle control solenoid valve
Ignition switch
E
Start signal
Atmospheric pressure sensor
E
Atmospheric pressure
Air conditioner switch
E
Air conditioner “ON” signal
The ECM receives signals sent from the engine coolant tempera-
ture sensor, crankshaft position sensor (TDC), ignition switch etc.
to determine engine speed and operating conditions. Based on
these signals, the ECM controls EGRC-solenoid valve (A and B)
operation and throttle solenoid valve operation.
The EGR control stops when engine coolant temperature is below
45°C (113°F), at idling, at starting and when the system compo-
nents and engine speed signals are disordered.
Engine coolant
temperature
°C (°F)
Load
EGRC-solenoid valve
Throttle control
solenoid valve
EGR valve
Throttle control
valve
Amount of EGR
gas
A
B
Below 45 (113)
Any
OFF
(Closed)
OFF
(Closed)
OFF
(Closed)
Fully closed
Fully open
—
Above 45 (113)
Low load
ON
(Open)
ON
(Open)
ON
(Open)
Fully open
Closed
Large
Medium load-1
ON
(Open)
ON
(Open)
OFF
(Closed)
Fully open
Fully open
Medium
Medium load-2
ON
(Open)
OFF
(Closed)
OFF
(Closed)
Half open
Fully open
Small
High load
OFF
(Closed)
OFF
(Closed)
OFF
(Closed)
Fully closed
Fully open
—
Component Description
The EGRC-solenoid valves A and B, control vacuum pressure act-
ing on the EGR valve. The EGR control valve will be fully opened,
half-opened or fully closed, as required.
The throttle control solenoid valve controls vacuum pressure acting
on the throttle control valve. Thus, intake air passages are opened
or closed in relation to exhaust gas and intake air. Utilizing the
relationship between exhaust gas pressure and intake air pressure
control, the amount of EGR (exhaust gas recirculated) is regulated
in three approximate measures — large, medium, small.
NEF513
DTC P1404 EGR SOL/V A, DTC P1405 EGR SOL/V B/P1407
THROTTLE SOLENOID VALVE
TD27Ti
EC-454
On Board Diagnosis Logic
DTC
Malfunction is detected when .
Check Items
(Possible cause)
P1404
0806
I
EGRC-solenoid valve A circuit is open or shorted.
I
Harness or connectors
(EGRC-solenoid valve A circuit is open or shorted.)
I
EGRC-solenoid valve A
P1405
0808
I
EGRC-solenoid valve B circuit is open or shorted.
I
Harness or connectors
(EGRC-solenoid valve B circuit is open or shorted.)
I
EGRC-solenoid valve B
P1407
0808
I
Throttle control solenoid valve circuit is open or
shorted.
I
Harness or connectors
(Throttle control solenoid valve circuit is open or
shorted.)
I
Throttle control solenoid valve
DTC Confirmation Procedure
WITH CONSULT-II
1) Turn ignition switch to “ON” position.
2) Select “DATA MONITOR” mode with CONSULT-II.
3) Wait at least 2 seconds.
WITHOUT CONSULT-II
1) Turn ignition switch to “ON” position and wait at least 2 sec-
onds.
2) Turn ignition switch to “LOCK” position, wait at least 5 seconds
and then turn to “ON” position.
3) Perform “Diagnostic Test Mode II” (Self-diagnostic results).
DTC P1404 EGR SOL/V A, DTC P1405 EGR SOL/V B/P1407
THROTTLE SOLENOID VALVE
TD27Ti
EC-455
Wiring Diagram
LHD MODELS
EGR control solenoid valve A and B
YEC683A
DTC P1404 EGR SOL/V A, DTC P1405 EGR SOL/V B/P1407
THROTTLE SOLENOID VALVE
TD27Ti
EC-456
RHD MODELS
EGR control solenoid valve A and B
YEC684A
DTC P1404 EGR SOL/V A, DTC P1405 EGR SOL/V B/P1407
THROTTLE SOLENOID VALVE
TD27Ti
Wiring Diagram (Cont’d)
EC-457
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