Infiniti Q45 (FY33). Manual — part 208
8) If 1st trip DTC is detected, go to “DIAGNOSTIC
PROCEDURE”, EC-305.
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)
EC-361
TEC063M
TROUBLE DIAGNOSIS FOR DTC P1105
Manifold Absolute Pressure (MAP)/Barometric
Pressure (BARO) Switch Solenoid Valve
(Cont’d)
EC-362
SEF396W
SEF431U
SEF432U
DIAGNOSTIC PROCEDURE
If the trouble is duplicated after “Procedure for malfunction
A”, perform “Procedure A” below. If the trouble is detected
after “Procedure for malfunction B”, perform “Procedure B”
on the next page.
Procedure A
INSPECTION START
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
(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
EC-363
SEF396W
SEF385U
SEF767X
SEF768X
SEF109L
Procedure B
INSPECTION START
CHECK VACUUM SOURCE AND CIR-
CUIT TO MAP/BARO SWITCH SOLE-
NOID VALVE.
1. Start engine and warm it up to normal
operating temperature.
2. Turn ignition switch “OFF”.
3. Connect the MAP/BARO switch sole-
noid valve and absolute pressure sen-
sor with a rubber tube that has a
vacuum gauge.
4. Turn ignition switch “ON”.
5. Select “MAP/BARO SW/V” in
“ACTIVE TEST” mode with
CONSULT-II.
6. Start engine and let it idle.
7. Touch “MAP” and “BARO” alter-
natively.
-------------------------------------------------------------------------------------------------------------------------------------- OR --------------------------------------------------------------------------------------------------------------------------------------
4. Turn ignition switch “ON”.
5. Check vacuum gauge within 5
seconds after turning ignition
switch “ON”.
Vacuum should not exist.
6. Start engine and let it idle.
7. Check vacuum gauge.
Vacuum should exist.
NG
E
OK
CHECK COMPONENT
(Absolute pressure sen-
sor).
1. Check for disconnection
of vacuum hose con-
nected to the sensor.
2. Disconnect sensor’s
connector and check
sensor harness connec-
tor for water.
Water should not exist.
Refer to “COMPONENT
INSPECTION” of
“TROUBLE DIAGNOSIS
FOR DTC P0105”,
EC-139.
OK
NG
H
Repair (dis-
connection)
or replace
absolute
pressure
sensor or
harness
connectors.
Go to “TROUBLE DIAG-
NOSIS FOR INTERMIT-
TENT INCIDENT” in
EC-117.
CHECK HOSE.
1. Turn ignition switch “OFF”.
2. Check hose for clogging, cracks, dis-
connection or improper connection.
OK
E
NG
Clean, repair or reconnect
the hose.
If NG, check vacuum port
for clogging.
OK
CHECK INTAKE SYSTEM.
Check the intake system
for air leaks.
q
A
(Go to next page.)
MAP/BARO
SW/S
Vacuum
BARO
Should not exist.
MAP
Should exist.
TROUBLE DIAGNOSIS FOR DTC P1105
Manifold Absolute Pressure (MAP)/Barometric
Pressure (BARO) Switch Solenoid Valve
(Cont’d)
H
H
H
H
H
EC-364
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