Infiniti QX4 (R50). Manual — part 241
SEF505V
Component Description
NBEC0256
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 volume
control solenoid valve when the throttle position sensor is malfunc-
tioning.
CONSULT-II Reference Value in Data Monitor
Mode
NBEC0257
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
CLSD THL/P SW
I
Engine: After warming up, idle
the engine
Throttle valve: Idle position
ON
Throttle valve: Slightly open
OFF
ECM Terminals and Reference Value
NBEC0671
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM’s transistor. Use a ground other than ECM terminals, such as the ground.
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
56
OR/L
Throttle position switch
(Closed position)
[Engine is running]
I
Accelerator pedal fully released
BATTERY VOLTAGE
(11 - 14V)
[Engine is running]
I
Accelerator pedal depressed
Approximately 0V
On Board Diagnosis Logic
NBEC0259
Malfunction is detected when battery voltage from the closed
throttle position switch is sent to ECM with the throttle valve
opened.
Possible Cause
NBEC0516
I
Harness or connectors
(The closed throttle position switch circuit is shorted.)
I
Closed throttle position switch
I
Throttle position sensor
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0510 CLOSED THROTTLE POSITION SWITCH
Component Description
EC-431
SEF197Y
SEF198Y
DTC Confirmation Procedure
NBEC0260
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously conducted,
always turn ignition switch “OFF” and wait at least 10 seconds
before conducting the next test.
WITH CONSULT-II
NBEC0260S01
1)
Start engine and warm it up to normal operating temperature.
2)
Turn ignition switch “OFF”, wait at least 10 seconds and then
start engine.
3)
Select “CLSD THL/P SW” in “DATA MONITOR” mode.
If “CLSD THL/P SW” is not available, go to step 5.
4)
Check the signal under the following conditions.
Condition
Signal indication
Throttle valve: Idle position
ON
Throttle valve: Slightly open
OFF
If the result is NG, go to “Diagnostic Procedure”, EC-435.
If OK, go to following step.
5)
Select “DATA MONITOR” mode with CONSULT-II.
6)
Drive the vehicle for at least 5 consecutive seconds under the
following condition.
THRTL POS SEN
More than 2.5V
VHCL SPEED SE
More than 5 km/h (3 MPH)
Selector lever
Suitable position
Driving location
Driving vehicle uphill (Increased engine load)
will help maintain the driving conditions
required for this test.
7)
If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-435.
SEF345X
Overall Function Check
NBEC0261
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.
WITH GST
NBEC0261S01
1)
Start engine and warm it up to normal operating temperature.
2)
Check the voltage between ECM terminal 56 (Closed throttle
position switch signal) and ground under the following condi-
tions.
At idle: Battery voltage
DTC P0510 CLOSED THROTTLE POSITION SWITCH
DTC Confirmation Procedure
EC-432
At 2,000 rpm: Approximately 0V
3)
If NG, go to “Diagnostic Procedure”, EC-435.
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0510 CLOSED THROTTLE POSITION SWITCH
Overall Function Check (Cont’d)
EC-433
Wiring Diagram
=NBEC0262
MEC967C
DTC P0510 CLOSED THROTTLE POSITION SWITCH
Wiring Diagram
EC-434
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