2004 NISSAN TERRANO engine

System Description
EGR CONTROL
Camshaft position sensor (TDC)EEngine speedECMEEGRC-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) Load
EGRC-solenoid valve
Throttle control
solenoid valve EGR valveThrottle control
valve Amount of EGR
gas
AB
Below 45 (113) Any OFF
(Closed) OFF
(Closed) OFF
(Closed) Fully closed Fully open Ð
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 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-454
http://vnx.su/

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-462.)
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-459
http://vnx.su/

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 terminal q
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 terminals q
2and engine
ground with CONSULT-II or tester.
Voltage: Battery voltage
OK
ENG Check the following:
I20A fuse
I Condition and operation
of ignition switch
I Harness connectors
M787,F66(LHD mod-
els)
I Harness connectors
F100,M775(RHD mod-
els)
I ECM relay
I Harness 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-460
http://vnx.su/

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 terminal q
2and engine
ground with CONSULT-II or tester.
Voltage: Battery voltage
OK
ENG Check the following.
I20A fuse
I ECM relay
I Harness connectors
M787,F66(LHD mod-
els)
I Harness connectors
F100,M77(RHD mod-
els)
I Harness 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 terminal q
1; ECM connector terminal
210and EGR Control Solenoid Valve
B connector terminal q
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)
I Harness 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)
I Harness 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-462.
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-461
http://vnx.su/

Component Description
AIR CONDITIONER CUT CONTROL
Air conditioner is cut under the following conditions:
IStarting engine
I Quick acceleration from low speed
I Undershooting of idle speed
I High engine coolant temperature [above 107ÉC (225ÉF)]
I Malfunctioning of engine speed sensor, accelerator position sen-
sor or vehicle speed sensor when engine speed is below 2,100
rpm.
On Board Diagnosis Logic
DTC Malfunction is detected when .... Check Items
(Possible cause)
P1530
0805 I
Air conditioner relay signal circuit is shorted. IHarness or connectors
(The air conditioner relay signal circuit is shorted.)
I Air conditioner relay
DTC Confirmation Procedure
WITH CONSULT-II
1) Turn ignition switch and air conditioner 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 and air conditioner switch to ªONº position.
Wait at least 2 seconds.
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 P1530 AIR CONDITIONER RLYTD27Ti
EC-463
http://vnx.su/

Diagnostic Procedure
INSPECTION START
(Air conditioner relay signal circuit)
CHECK POWER SUPPLY.
1. Turn ignition switch to ªLOCKº position.
2. Disconnect air conditioner relay har- ness connector.
3. Check voltage between air conditioner relay connector terminal q
2,q3and
engine ground.
Voltage: Battery voltage
OK
ENG Check the following:
I10A fuse
I Harness for open or
short between fuse block
and A/C relay
If NG, replace or repair the
parts attached.
CHECK INPUT SIGNAL CIRCUIT.
1. Turn ignition switch to ªLOCKº position.
2. Disconnect ECM harness connector.
3.Check harness continuity between ECM harness connector terminal
204and air
conditioner relay harness connector ter-
minal q
1. Refer to wiring diagram.
Continuity should exist.
If OK, check harness for short-
circuit.
OK
ENG Check the following:
IHarness connectors
M812,F120(LHD mod-
els)
I Harness for open or
short-circuit between
ECM and air conditioner
relay.
If NG, repair harness or
connectors.
CHECK AIR CONDITIONER RELAY.
Refer to HA section for inspection.
OK
ENG Replace air conditioner
relay.
Disconnect and reconnect harness
connectors in the circuit. Then retest.
Trouble is not fixed
Check ECM pin terminals for damage and
check the connection of ECM harness
connector. Reconnect ECM harness con-
nector and retest.
INSPECTION END
NEF512
PBIB0185E
H
H
H
H
H
H
DTC P1530 AIR CONDITIONER RLYTD27Ti
EC-466
http://vnx.su/

Description
The ECM consists of a microcomputer and connectors for signal
input and output and for power supply. The unit controls the engine.
On Board Diagnosis Logic
DTCMalfunction is detected when ... Check Items (Possible Cause)
P1603
0901 I
ECM calculation function is malfunctioning. IECM
P1607
0301
DTC Confirmation Procedure
WITH CONSULT-II
1) Turn ignition switch ªONº.
2) Select ªDATA MONITORº mode with CONSULT-II.
3) Start engine and wait at least 2 seconds.
WITHOUT CONSULT-II
1) Turn ignition switch ªONº and wait at least 2 seconds.
2) Start engine and wait at least 2 seconds.
3) Turn ignition switch ªOFFº, wait at least 5 seconds and then turn ªONº.
4) Perform ªDiagnostic Test Mode II (Self-diagnostic results)º with ECM.
SEC220B
SEF817Y
DTC PD1603 ECM 12, DTC P1607 ECM2TD27Ti
EC-467
http://vnx.su/

Diagnostic Procedure
INSPECTION START
CHECK OVERALL FUNCTION.
1. Turn ignition switch to ªONº posi-tion.
2. Check ªSTART SIGNALº in ªDATA MONITORº mode with CONSULT-
II.
------------------------------------------------------------------------------------------------------------------------------------- -OR--------------------------------------------------------------------------------------------------------------------------------------
1. Turn ignition switch to ªSTARTº
position.
2. Check voltage between ECM con- nector terminal
422and engine
ground.
Voltage: Ignition switch ªSTARTº:Battery voltage
Except above: Approximately 0V
NG
EOK INSPECTION END
Check if 40A fusible link is OK.
OKENGReplace 40A fusible link.
CHECK INPUT SIGNAL CIRCUIT.
1. Turn ignition switch to ªLOCKº position.
2. Disconnect ECM harness connector, ignition switch connector.
3. Check harness continuity between ECM connector terminal
422and ignition
switch connector terminal q
5. Refer to
wiring diagram.
Continuity should exist.
If OK, check harness for short circuit.
OK
ENG Check the following:
I Harness connectors
M787,F66(LHD mod-
els)
I Condition and operations
of ignition switch
I Harness for open or
short-circuit between
ECM and ignition switch
If NG, repair ignition
switch, harness or con-
nectors.
Disconnect and reconnect harness connec-
tors in the circuit. Then retest.
Trouble is not fixed.
Check ECM pin terminals for damage and
check the connection of ECM harness con-
nector. Reconnect ECM harness connector
and retest.
INSPECTION END
IGN ªONº OFF
IGN ªSTARTº ON
PBIB0763E
MEC966D
H
H
H
H
H
H
START SIGNALTD27Ti
EC-473
http://vnx.su/