Infiniti Q45 (FY33). Manual — part 204
SEF353Q
COMPONENT INSPECTION
IACV-AAC valve
1.
Disconnect IACV-AAC valve harness connector.
2.
Check resistance between the following terminals.
terminal
q
2
and terminals
q
1
,
q
3
terminal
q
5
and terminals
q
4
,
q
6
Resistance:
Approximately 30
Ω
[at 20°C (68°F)]
SEF261Q
3.
Reconnect IACV-AAC valve harness connector.
4.
Remove idle air adjusting unit assembly (IACV-AAC valve is
built-in) from engine.
(The IACV-AAC valve harness connector should remain con-
nected.)
5.
Turn ignition switch “ON” and “OFF”, and ensure the IACV-
AAC valve shaft smoothly moves forward and backward,
according to the ignition switch position.
If NG, replace the IACV-AAC valve.
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P0505
Idle Air Control Valve (IACV) — Auxiliary Air
Control (AAC) Valve (Cont’d)
EC-345
SEF350WA
Closed Throttle Position Switch
COMPONENT DESCRIPTION
A closed throttle position switch and wide open throttle position
switch are built into the throttle position sensor unit. The wide open
throttle position switch is used only for A/T control.
When the throttle valve is in the closed position, the closed throttle
position switch sends a voltage signal to the ECM. The ECM only
uses this signal to open or close the EVAP canister purge control
valve when the throttle position sensor is malfunctioning.
CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
CLSD THL/P SW
I
Engine: After warming up
I
Ignition switch: ON
(Engine stopped)
I
More than −40.0 kPa (−300
mmHg, −11.81 inHg) of vacuum
is applied to the throttle opener
with a handy vacuum pump.
Throttle valve: Idle position
ON
Throttle valve: Slightly open
OFF
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)
74
GY/L
Throttle position switch
(Closed position)
Engine is running (Warmed-up condition)
I
Accelerator pedal fully released
I
More than −40.0 kPa (−300 mmHg, −11.81
inHg) of vacuum is applied to the throttle
opener with a handy vacuum pump.
BATTERY VOLTAGE
(11 - 14V)
Ignition switch “ON”
Accelerator pedal fully depressed
Approximately 0V
ON BOARD DIAGNOSIS LOGIC
Diagnostic Trouble
Code No.
Malfunction is detected when .
Check Items
(Possible Cause)
P0510
0203
I
Battery voltage from the closed throttle position
switch is sent to ECM with the throttle valve
opened.
I
Harness or connectors
(The closed throttle position switch circuit is
shorted.)
I
Closed throttle position switch
I
Throttle position sensor
TROUBLE DIAGNOSIS FOR DTC P0510
EC-346
SEF198Y
SEF424U
DIAGNOSTIC TROUBLE CODE CONFIRMATION
PROCEDURE
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCE-
DURE” has been previously conducted, always turn ignition
switch “OFF” and wait at least 5 seconds before conducting
the next test.
1) Start engine and warm it up to normal operating tem-
perature.
2) Check voltage between ECM terminal
q
74
and ground
under the following conditions.
At idle: Battery voltage
At 2,000 rpm: 0 - 1V
If the check result is NG, go to “DIAGNOSTIC
PROCEDURE”, EC-349.
If OK, go to following step.
3) Select “DATA MONITOR” mode with CONSULT-II at the
start of the test.
4) Drive the vehicle for at least 5 consecutive seconds
under the following condition.
THRTL POS SEN: More than 1.8V
VHCL SPEED SE: More than 4 km/h (2 MPH)
Selector lever: Suitable position
Driving pattern: Driving vehicle uphill (Increased
engine load) will help maintain the
driving conditions required for
this test.
5) If 1st trip DTC is detected, go to “DIAGNOSTIC
PROCEDURE”, EC-349.
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
OVERALL FUNCTION CHECK
Use this procedure to check the overall function of the closed
throttle position switch circuit. During this check, a 1st trip DTC
might not be confirmed.
1) Start engine and warm it up to normal operating tem-
perature.
2) Check the voltage between ECM terminal
q
74
and
ground under the following conditions.
At idle: Battery voltage
At 2,000 rpm: Approximately 0V
3) If NG, go to “DIAGNOSTIC PROCEDURE”, EC-349.
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P0510
Closed Throttle Position Switch (Cont’d)
EC-347
TEC061M
TROUBLE DIAGNOSIS FOR DTC P0510
Closed Throttle Position Switch (Cont’d)
EC-348
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