Infiniti QX4 (R50). Manual — part 253
10
CHECK CRANKSHAFT POSITION SENSOR (REF)-II
Check resistance between CKPS (REF) terminals 1 and 2.
SEF350X
OK or NG
OK (With CONSULT-II)
©
GO TO 11.
OK (Without CONSULT-
II)
©
GO TO 12.
NG
©
Replace crankshaft position sensor (REF).
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1130 SWIRL CONTROL VALVE CONTROL SOLENOID VALVE
Diagnostic Procedure (Cont’d)
EC-479
11
CHECK THROTTLE POSITION SENSOR
With CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Stop engine (ignition switch OFF).
3. Remove the vacuum hose connected to the throttle opener.
4. Connect suitable vacuum hose to the vacuum pump and the opener.
5. Apply vacuum [more than −40.0 kPa (−300 mmHg, −11.81 inHg)] until the throttle drum becomes free from the rod of
the throttle opener.
SEF793W
6. Turn ignition switch ON.
7. Select “DATA MONITOR” mode with CONSULT-II.
8. Check voltage of “THRTL POS SEN” under the following conditions.
Voltage measurement must be made with throttle position sensor installed in vehicle.
SEF062Y
OK or NG
OK
©
GO TO 14.
NG
©
GO TO 13.
DTC P1130 SWIRL CONTROL VALVE CONTROL SOLENOID VALVE
Diagnostic Procedure (Cont’d)
EC-480
12
CHECK THROTTLE POSITION SENSOR
Without CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Stop engine (ignition switch OFF).
3. Remove the vacuum hose connected to the throttle opener.
4. Connect suitable vacuum hose to the vacuum pump and the opener.
5. Apply vacuum [more than −40.0 kPa (−300 mmHg, −11.81 inHg)] until the throttle drum becomes free from the rod of
the throttle opener.
SEF793W
6. Turn ignition switch ON.
7. Check voltage between ECM terminal 91 (Throttle position sensor signal) and ground.
Voltage measurement must be made with throttle position sensor installed in vehicle.
MTBL0231
OK or NG
OK
©
GO TO 14.
NG
©
GO TO 13.
13
ADJUST CLOSED THROTTLE POSITION SWITCH
Adjust closed throttle position switch. Refer to “Basic Inspection”, EC-101.
MTBL0655
OK or NG
OK
©
GO TO 14.
NG
©
Replace throttle position sensor. To adjust it, perform “Basic Inspection”, EC-101.
14
CHECK INTERMITTENT INCIDENT
Perform “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-140.
©
INSPECTION END
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1130 SWIRL CONTROL VALVE CONTROL SOLENOID VALVE
Diagnostic Procedure (Cont’d)
EC-481
SEF359Z
Component Description
NBEC0705
Intake valve advance unit position sensors are located in the front
cylinder heads in both right/left banks.
This sensor uses a Hall IC (element).
The cam position is determined by the intake primary cam sprocket
concave (in three places). The ECM provides feedback to the
intake valve timing control for appropriate target valve open-close
timing according to drive conditions based on detected cam posi-
tion.
CONSULT-II Reference Value in Data Monitor
Mode
NBEC0706
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
INT/V TIM (B1)
INT/V TIM (B2)
I
Engine: After warming up
I
Shift lever “N”
I
Quickly depressed accelerator
pedal
I
No-load
Idle
0° CA
2,000 rpm
Approximately 12 - 18° CA
ECM Terminals and Reference Value
NBEC0707
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 the ECM terminals, such as the ground.
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
79
Y/G
Intake valve timing
control position sen-
sors (RH)
[Engine is running]
I
Warm-up condition
I
Idle speed
Approximately 0.5V
SEF351Z
[Engine is running]
I
Warm-up condition
I
Engine speed is 2,000 rpm.
Approximately 0.5V
SEF352Z
DTC P1140 (RIGHT, -B1), P1145 (LEFT, -B2) INTAKE VALVE TIMING CONTROL
POSITION SENSOR (CIRCUIT)
Component Description
EC-482
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