Infiniti Q45 (FY33). Manual — part 209
SEF431U
SEF432U
q
A
CHECK POWER SUPPLY.
1. Turn ignition switch “OFF”.
2. Disconnect MAP/BARO switch solenoid
valve harness connector.
3. Turn ignition switch “ON”.
4. Check voltage between terminal
q
1
and
engine ground with CONSULT-II or
tester.
Voltage: Battery voltage
OK
E
NG
Check the following.
I
Harness connectors
F121
,
F21
,
F63
,
M49
I
10A fuse
I
Harness for open or
short between MAP/
BARO switch solenoid
valve and fuse
If NG, repair harness or
connectors.
CHECK OUTPUT SIGNAL CIRCUIT.
1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM
terminal
q
41
and terminal
q
2
with CON-
SULT-II or tester.
Continuity should exist.
If OK, check harness for short to
ground and short to power.
OK
E
NG
Check the following.
I
Harness connectors
F121
,
F21
I
Harness for open or
short between MAP/
BARO switch solenoid
valve and ECM
If NG, repair open circuit or
short to ground or short to
power in harness or con-
nectors.
CHECK COMPONENT
(Absolute pressure sensor).
1. Check for disconnection of vacuum
hose connected to the sensor.
2. Disconnect sensor’s connector and
check sensor harness connectors for
water.
Water should not exist.
Refer to “COMPONENT INSPECTION” of
“TROUBLE DIAGNOSIS FOR DTC
P0105”, EC-132.
OK
E
NG
Repair (disconnection) or
replace harness connec-
tors or replace absolute
pressure sensor.
CHECK COMPONENT
(MAP/BARO switch solenoid valve).
Refer to “COMPONENT INSPECTION” on
next page.
OK
E
NG
Replace MAP/BARO
switch solenoid valve.
Perform “TROUBLE DIAGNOSIS FOR
INTERMITTENT INCIDENT”, EC-117.
INSPECTION END
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P1105
Manifold Absolute Pressure (MAP)/Barometric
Pressure (BARO) Switch Solenoid Valve
(Cont’d)
H
H
H
H
H
H
EC-365
SEF767X
SEF768X
MEC488B
COMPONENT INSPECTION
MAP/BARO switch solenoid valve
1. Start engine and warm it up to normal operating tem-
perature.
2. Perform “MAP/BARO SW/V” in “ACTIVE TEST” mode
with CONSULT-II.
3. Check the following.
I
Condition: At idle under no-load
I
CONSULT-II display
MAP/BARO SW/V
ABSOL PRES/SE (Voltage)
BARO
More than 2.6V
MAP
Less than the voltage at BARO
I
Time for voltage to change
MAP/BARO SW/V
Required time to switch
BARO to MAP
Less than 1 second
MAP to BARO
4. If NG, check solenoid valve as shown below.
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1. Remove MAP/BARO switch solenoid valve.
2. Check air passage continuity.
Condition
Air passage
continuity
between
q
A
and
q
B
Air passage
continuity
between
q
A
and
q
C
12V direct current supply
between terminals
q
1
and
q
2
Yes
No
No supply
No
Yes
3. Check the time required for the solenoid valve to switch.
It should be less than 1 second.
4. If NG, replace solenoid valve.
5. If OK, check “Absolute pressure sensor”. Refer to
“COMPONENT INSPECTION”, EC-139.
TROUBLE DIAGNOSIS FOR DTC P1105
Manifold Absolute Pressure (MAP)/Barometric
Pressure (BARO) Switch Solenoid Valve
(Cont’d)
EC-366
Intake Valve Timing Control (P1110: Left bank),
(P1135: Right bank)
SYSTEM DESCRIPTION
Camshaft position sensor
E
Engine speed
ECM
E
Intake
valve tim-
ing control
solenoid
valve
Mass air flow sensor
E
Amount of intake air
Engine coolant temperature sensor
E
Engine coolant temperature
Throttle position sensor
E
Throttle position
Vehicle speed sensor
E
Vehicle speed
The intake valve timing control system is utilized to
control intake valve opening and closing timing.
Engine coolant temperature signals, engine speed,
amount of intake air, vehicle speed and throttle posi-
tion are used to determine intake valve timing.
The intake camshaft sprocket position is regulated
by oil pressure controlled by the intake valve timing
control.
When ECM sends ON signal to intake valve timing
control solenoid valve, oil pressure is transmitted to
camshaft sprocket. Then, intake side camshaft is
advanced.
SEF587TA
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P1110 (B1), P1135 (B2)
EC-367
OPERATION
Engine operating condition
Intake valve timing
control
solenoid valve
Intake valve opening
and closing time
Valve overlap
Engine valve timing
I
Engine coolant temperature is
between 15°C (59°F) to 110°C
(230°F) and engine speed is
between 1,100 rpm and 4,600
rpm.
I
During high load condition
I
Vehicle speed is more than 4
km/h (2 MPH).
ON
Advance
Increased
q
II
Those other than above
OFF
Normal
Normal
q
I
CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
INT/V SOL-B1
INT/V SOL-B2
I
Engine is in warm up condition.
I
Engine speed is more than 2,000 rpm.
I
Quickly depressed accelerator pedal
I
Vehicle speed is more than 4 km/h (2 MPH).
OFF
,
ON (Using “INT/V TIM-B1 (B2)” in “DATA MONITOR”,
the difference of degree between “OFF” and “ON” is approxi-
mately 20 deg.
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)
24
(B2)
BR/Y
Intake valve timing control
solenoid valves
Engine is running.
Intake valve timing control solenoid is operat-
ing.
Approximately 0V
25
(B1)
BR
Engine is running.
Intake valve timing control solenoid is not
operating.
Battery voltage
70
(B2)
R/L
Intake valve timing control
position sensors
Engine is running.
Idle speed
Approximately 0V
SEF551T
71
(B1)
L/W
Engine is running.
Engine speed is 2,000 rpm.
Approximately 0V
SEF552T
TROUBLE DIAGNOSIS FOR DTC P1110 (B1), P1135 (B2)
Intake Valve Timing Control (P1110: Left bank),
(P1135: Right bank) (Cont’d)
EC-368
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