Infiniti Q45 (FY33). Manual — part 223
SEF159T
SEF547P
SEF548P
DIAGNOSTIC PROCEDURE
INSPECTION START
CHECK POWER SUPPLY.
1. Disconnect EGR temperature sensor
harness connector.
2. Turn ignition switch “ON”.
3. Check voltage between terminal
q
1
and
ground with CONSULT-II or tester.
Voltage: Approximately 5V
OK
E
NG
Repair harness or connec-
tors.
CHECK GROUND CIRCUIT.
1. Turn ignition switch “OFF”.
2. Check harness continuity between termi-
nal
q
2
and engine ground.
Continuity should exist.
If OK, check harness for short to power.
OK
E
NG
Check the following.
I
Harness connectors
F63
,
M49
I
Harness connectors
M4
,
B3
I
Joint connector-16
I
Harness for open or short
between ECM and EGR
temperature sensor
I
Harness for open or short
between EGR tempera-
ture sensor and throttle
actuator control (TAC)
module
I
Harness for open or short
between TCM and EGR
temperature sensor
If NG, repair open circuit or
short to power in harness
or connectors.
CHECK COMPONENT
(EGR temperature sensor).
Refer to “COMPONENT INSPECTION” on
next page.
OK
E
NG
Replace EGR temperature
sensor.
Perform “TROUBLE DIAGNOSIS FOR
INTERMITTENT INCIDENT”, EC-117.
INSPECTION END
SEF643Q
COMPONENT INSPECTION
EGR temperature sensor
Check resistance change and resistance value.
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P1401
EGR Temperature Sensor (Cont’d)
H
H
H
H
H
EC-421
SEF320U
EGR temperature
°C (°F)
Voltage*
(V)
Resistance
(M
Ω
)
0 (32)
4.61
0.68 - 1.11
50 (122)
2.53
0.092 - 0.12
100 (212)
0.87
0.017 - 0.024
If NG, replace EGR temperature sensor.
TROUBLE DIAGNOSIS FOR DTC P1401
EGR Temperature Sensor (Cont’d)
EC-422
EGR Function (Open)
SYSTEM DESCRIPTION
Crankshaft position sensor
E
Engine speed
ECM
E
EGRC-sole-
noid valve
Mass air flow sensor
E
Amount of intake air
Engine coolant temperature sensor
E
Engine coolant temperature
Ignition switch
E
Start signal
Vehicle speed sensor
E
Vehicle speed
Throttle position sensor
E
Throttle position
Secondary throttle position sensor
E
Throttle position
This system cuts and controls vacuum applied to the
EGR valve to suit engine operating conditions. This
cut-and-control operation is accomplished through
the ECM and the EGRC-solenoid valve. When the
ECM detects any of the following conditions, current
flows through the solenoid valve. This causes the
port vacuum to be discharged into the atmosphere.
The EGR valve remain closed.
I
Low engine coolant temperature
I
Engine starting
I
Engine stopped
I
Engine idling
I
Excessively high engine coolant temperature
I
Mass air flow sensor malfunction
I
Low vehicle speed
I
TCS is operating
SEF317U
SEF783K
COMPONENT DESCRIPTION
Exhaust gas recirculation (EGR) valve
The EGR valve controls the amount of exhaust gas routed to the
intake manifold. Vacuum is applied to the EGR valve in response
to throttle valve opening. The vacuum controls the movement of a
taper valve connected to the vacuum diaphragm in the EGR valve.
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P1402
EC-423
SEF383RD
EGRC-solenoid valve
The EGRC-solenoid valve responds to signals from the ECM.
When the ECM sends an ON (ground) signal, the coil in the sole-
noid valve is energized. The signal reaches to the EGR valve.
When the ECM sends an OFF signal, a plunger will then move to
cut the vacuum signal from the intake manifold collector to the EGR
valve.
CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
EGR TEMP SEN
I
Engine: After warming up
Less than 4.5V
EGRC SOL/V
I
Engine: After warming up
I
Air conditioner switch: “OFF”
I
Shift lever: “N”
I
No-load
Idle
OFF (CUT)
Revving engine up from idle to 3,000
rpm
ON (FLOW)
ECM TERMINALS AND REFERENCE VALUE
Specification data are reference values, and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring voltage. Doing so may result in damage to the
ECM’s transistor. Use a ground other than ECM terminals such as the body ground.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA
(DC voltage)
75
W
EGR temperature sensor
Engine is running. (Warmed-up condition)
Idle speed
Less than 4.5V
Engine is running. (Warmed-up condition)
EGR system is operating.
0 - 1.0V
10
L/Y
EGRC-solenoid valve
Engine is running. (Warmed-up condition)
Lift up drive wheels and rev engine up from
idle to 3,000 rpm in “D” position.
0 - 0.7V
Engine is running. (Warmed-up condition)
Idle speed
BATTERY VOLTAGE
(11 - 14V)
SEF073P
ON BOARD DIAGNOSIS LOGIC
If EGR temperature sensor detects EGR flow under the condition
that does not call for EGR, a high-flow malfunction is diagnosed.
NOTE:
Diagnosis for this DTC will end when engine coolant tempera-
ture is approx. 50 to 60°C (122 to 140°F). Ignition switch must
be turned “ON” (engine start) with engine coolant temperature
below 40°C (104°F) when starting DTC confirmation proce-
dure.
TROUBLE DIAGNOSIS FOR DTC P1402
EGR Function (Open) (Cont’d)
EC-424
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