Nissan Terrano r20e. Instruction — part 198
Diagnostic Procedure
INSPECTION START
CHECK FOR AIR IN FUEL FILTER.
1. Move priming pump up and down to
purge air from fuel filter.
2. Perform “DIAGNOSTIC TROUBLE
CODE CONFIRMATION PROCE-
DURE”.
CHECK INPUT SIGNAL CIRCUIT.
1. Turn ignition switch to “LOCK” position.
2. Disconnect ECM harness connector
and needle lift sensor harness connec-
tor.
3. Check harness continuity between
needle lift sensor connector terminal
q
1
and ECM connector terminal
345
.
Refer to wiring diagram.
Continuity should exist.
If OK, check harness for short-circuit.
OK
E
NG
Check the following:
I
Harness for open circuit
between needle lift sen-
sor and ECM
If NG, repair harness or
connectors.
CHECK GROUND CIRCUIT-I.
Check harness continuity between needle
lift sensor connector terminals
q
2
and ECM
connector terminals
333
. Refer to wiring
diagram.
Continuity should exist.
If OK, check harness for short-circuit.
OK
E
NG
Check the following:
I
Harness for open or
short-circuit between
ECM and needle lift sen-
sor.
If NG, repair harness or
connectors.
CHECK GROUND CIRCUIT-II.
Check resistance between ECM connector
terminal
346
and engine ground. Refer to
wiring diagram.
Continuity should exist.
If OK, check harness for short-circuit.
OK
E
NG
Check the following:
I
Harness for open-circuit
between ECM and
engine ground
If NG, repair harness or
connectors.
CHECK NO. 1 INJECTION NOZZLE FOR
CLOGGING.
Refer to spray pattern test of “INJECTION
NOZZLE”.
If NG, replace No. 1 injection nozzle.
q
A
NEF591
NEF690
NEF463
H
H
H
H
H
H
DTC P1240 NEEDLE LIFT SEN, DTC P1242 NEEDLE LIFT SE
(RPM)
TD27Ti
EC-429
q
A
CHECK COMPONENT.
(Needle lift sensor)
Refer to “COMPONENT INSPECTION” on
EC-430.
E
NG
Replace needle lift sensor.
Disconnect and reconnect harness con-
nectors 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
Component Inspection
NEEDLE LIFT SENSOR
1. Disconnect needle lift sensor harness connector.
2. Check continuity between needle lift sensor terminals
q
1
and
q
2
.
Resistance: Approximately 105
Ω
[at 25°C (77°F)]
If NG, replace needle lift sensor with injection nozzle holder.
MEC962D
H
H
H
H
DTC P1240 NEEDLE LIFT SEN, DTC P1242 NEEDLE LIFT SE
(RPM)
TD27Ti
Diagnostic Procedure (Cont’d)
EC-430
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-431
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-432
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