2002 NISSAN TERRANO Service Repair Manual

System Description
EGR CONTROL
Camshaft position sensor (TDC)EEngine speed
ECMEEGRC-solenoid valve A
Mass air flow sensorEMass air flowEEGRC-solenoid valve B
Engine coolant temperature sensorEEngine coolant temperatureEThrottle control solenoid valve
Ignition switchEStart signal
Atmospheric pressure sensor
EAtmospheric pressure
Air conditioner switch
EAir conditioner ªONº 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
45ÉC (113ÉF), at idling, at starting and when the system compo-
nents and engine speed signals are disordered.
Engine coolant
temperature
ÉC (ÉF)LoadEGRC-solenoid valve
Throttle control
solenoid valveEGR valveThrottle control
valveAmount of EGR
gas
AB
Below 45 (113) AnyOFF
(Closed)OFF
(Closed)OFF
(Closed)Fully closed Fully open Ð
Above 45 (113)Low loadON
(Open)ON
(Open)ON
(Open)Fully open Closed Large
Medium load-1ON
(Open)ON
(Open)OFF
(Closed)Fully open Fully open Medium
Medium load-2ON
(Open)OFF
(Closed)OFF
(Closed)Half open Fully open Small
High loadOFF
(Closed)OFF
(Closed)OFF
(Closed)Fully closed Fully open Ð
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 Ð large, medium, small.
NEF513
DTC P1404 EGR SOL/V A, DTC P1405 EGR SOL/V B/P1407
THROTTLE SOLENOID VALVETD27Ti
EC-431

On Board Diagnosis Logic
DTC Malfunction is detected when ....Check Items
(Possible cause)
P1404
0806IEGRC-solenoid valve A circuit is open or shorted.IHarness or connectors
(EGRC-solenoid valve A circuit is open or shorted.)
IEGRC-solenoid valve A
P1405
0808IEGRC-solenoid valve B circuit is open or shorted.IHarness or connectors
(EGRC-solenoid valve B circuit is open or shorted.)
IEGRC-solenoid valve B
P1407
0808IThrottle control solenoid valve circuit is open or
shorted.IHarness or connectors
(Throttle control solenoid valve circuit is open or
shorted.)
IThrottle control solenoid valve
DTC Confirmation Procedure
WITH CONSULT-II
1) Turn ignition switch to ªONº position.
2) Select ªDATA MONITORº mode with CONSULT-II.
3) Wait at least 2 seconds.
WITHOUT CONSULT-II
1) Turn ignition switch to ªONº position and wait at least 2 sec-
onds.
2) Turn ignition switch to ªLOCKº position, wait at least 5 seconds
and then turn to ªONº position.
3) Perform ªDiagnostic Test Mode IIº (Self-diagnostic results).
DTC P1404 EGR SOL/V A, DTC P1405 EGR SOL/V B/P1407
THROTTLE SOLENOID VALVETD27Ti
EC-432

Wiring Diagram
LHD MODELS
EGR control solenoid valve A and B
YEC159A
DTC P1404 EGR SOL/V A, DTC P1405 EGR SOL/V B/P1407
THROTTLE SOLENOID VALVETD27Ti
EC-433

RHD MODELS
EGR control solenoid valve A and B
YEC160A
DTC P1404 EGR SOL/V A, DTC P1405 EGR SOL/V B/P1407
THROTTLE SOLENOID VALVETD27Ti
Wiring Diagram (Cont'd)
EC-434

Throttle control solenoid valve
YEC161A
DTC P1404 EGR SOL/V A, DTC P1405 EGR SOL/V B/P1407
THROTTLE SOLENOID VALVETD27Ti
Wiring Diagram (Cont'd)
EC-435

Diagnostic Procedure
EGR CONTROL
INSPECTION START
CHECK OVERALL FUNCTION.
1. Start engine and warm it up sufficiently.
2. Perform diagnostic test mode II (Self-
diagnostic results).
Make sure that diagnostic trouble code
P0000 (0505) is displayed.
3. Make sure that EGR valve spring
moves up and down (Use your finger)
under the following conditions.
At idle:
Spring does not move.
Racing engine from idle to 3,000
rpm:
Spring moves up and down.
4. Make sure that throttle control valve rod
moves up and down under the following
conditions.
At idle:
Rod does not move.
Racing engine from idle to 3,000
rpm:
Rod moves up and down.
NG
EOK
INSPECTION END
CHECK VACUUM SOURCES TO EGR
VALVE AND THROTTLE CONTROL
VA LV E .
1. Disconnect vacuum hoses to EGR
valve and throttle control valve.
2. Make sure that vacuum exists under
the following conditions.
At idle:
Vacuum should exist.
Racing engine from idle to 3,000
rpm:
Vacuum should not exist.
NG
EOK
CHECK COMPONENTS
(EGR valve and throttle
control valve).
(See page EC-439.)
NG
Replace malfunctioning
component(s).
qA
YEC243A
NEF509
YEC244A
NEF511
H
H
H
H
DTC P1404 EGR SOL/V A, DTC P1405 EGR SOL/V B/P1407
THROTTLE SOLENOID VALVETD27Ti
EC-436

qA
CHECK CONTROL FUNCTION.
With CONSULT-II
1. Turn ignition switch to ªONº position.
2. Turn EGRC-solenoid valve A, B and
throttle control solenoid valve to ªONº
and to ªOFFº in ªACTIVE TESTº mode
with CONSULT and check operating
sound.
Without CONSULT-II
1. Check voltage between ECM connector
terminals
208,210and engine
ground with tester under the following
conditions.
Voltage:
At idle:
Approximately 0.4V
Engine speed is more than 3,000
rpm:
Battery voltage
2. Check voltage between ECM connector
terminalq
1and engine ground with
tester under the following conditions.
Voltage:
At idle:
Approximately 0.4V
Engine speed is more than 2,400
rpm:
Battery voltage
NG
EOK
CHECK VACUUM HOSE.
Check vacuum hose for
clogging, cracks or
improper connection.
CHECK POWER SUPPLY-I.
1. Turn ignition switch to ªLOCKº position.
2. Disconnect EGRC-solenoid valve A and
B harness connector.
3. Turn ignition switch to ªONº position.
4. Check voltage between EGRC-solenoid
valve A and B terminalsq
2and engine
ground with CONSULT-II or tester.
Voltage: Battery voltage
OK
ENG
Check the following:
I20A fuse
ICondition and operation
of ignition switch
IHarness connectors
M787,F66(LHD mod-
els)
IHarness connectors
F100,M775(RHD mod-
els)
IECM relay
IHarness for open or
short-circuit between
EGRC-solenoid valve A,
B and fuse.
If NG, replace fuse or
repair ignition switch, har-
ness or connectors.
qB
MEC953D
SEF816F
YEC247A
H
H
H
DTC P1404 EGR SOL/V A, DTC P1405 EGR SOL/V B/P1407
THROTTLE SOLENOID VALVETD27Ti
Diagnostic Procedure (Cont'd)
EC-437

qB
CHECK POWER SUPPLY-II.
1. Turn ignition switch ªOFFº.
2. Disconnect throttle control solenoid
valve harness connector.
3. Turn ignition switch ªONº.
4. Check voltage between throttle solenoid
valve connector terminalq
2and engine
ground with CONSULT-II or tester.
Voltage: Battery voltage
OK
ENG
Check the following.
I20A fuse
IECM relay
IHarness connectors
M787,F66(LHD mod-
els)
IHarness connectors
F100,M77(RHD mod-
els)
IHarness for open or
short circuit between
throttle control solenoid
valve and ECM relay.
If NG, repair or replace
harness or connectors.
CHECK OUTPUT SIGNAL CIRCUIT-I.
1. Disconnect ECM harness connector.
2. Check harness continuity between
ECM connector terminal
208and
EGR Control Solenoid Valve A connec-
tor terminalq
1; ECM connector terminal
210and EGR Control Solenoid Valve
B connector terminalq
1. Refer to wiring
diagram.
Continuity should exist.
If OK, check harness for short-circuit.
OK
ENG
Check the following:
IHarness connectors
F100,M775(RHD mod-
els)
IHarness for open or
short-circuit between
EGRC-solenoid valve A,
B and ECM
If NG, repair harness or
connectors.
CHECK OUTPUT SIGNAL CIRCUIT-II.
1. Disconnect ECM harness connector.
2. Check harness continuity between
ECM connector terminal
213and
throttle control solenoid valve terminal
q
1. Refer to wiring diagram.
Continuity should exist.
If OK, check harness for short circuit.
OK
ENG
Check the following:
IHarness connectors
F137,M853(RHD mod-
els)
IHarness for open or
short circuit between
throttle control solenoid
valve and ECM
If NG, repair harness or
connectors.
CHECK COMPONENTS
(EGRC-solenoid valve A and B).
(Throttle control valve)
Refer to EC-439.
OK
ENG
Replace malfunctioning
component(s).
Disconnect and reconnect harness con-
nectors in the circuit. Then retest.
Trouble is not fixed.
Check ECM pin terminals for damage or
the connection of ECM harness connector.
Reconnect ECM harness connector and
retest.
INSPECTION END
MEC954D
H
H
H
H
H
H
H
DTC P1404 EGR SOL/V A, DTC P1405 EGR SOL/V B/P1407
THROTTLE SOLENOID VALVETD27Ti
Diagnostic Procedure (Cont'd)
EC-438