Infiniti Q45. Manual — part 435
DTC P0340 CMP SENSOR (PHASE)
EC-379
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DTC P0340 CMP SENSOR (PHASE)
PFP:23731
Component Description
NBS001WI
The camshaft position sensor (PHASE) senses the protrusion of
exhaust camshaft sprocket to identify a particular cylinder. The
crankshaft position sensor (POS) senses the piston position.
When the crankshaft position sensor (POS) system becomes inoper-
ative, the camshaft position sensor (PHASE) provides various con-
trols of engine parts instead, utilizing timing of cylinder identification
signals.
The sensor consists of a permanent magnet and Hall IC.
When engine is running, the high and low parts of the teeth cause
the gap with the sensor to change.
The changing gap causes the magnetic field near the sensor to
change.
Due to the changing magnetic field, the voltage from the sensor changes.
ECM receives the signals as shown in the figure.
On Board Diagnosis Logic
NBS001WJ
PBIB0562E
PBIB2448E
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0340
0340
Camshaft position sensor
(PHASE) circuit
●
The cylinder No. signal is not sent to ECM
for the first few seconds during engine
cranking.
●
The cylinder No. signal is not sent to ECM
during engine running.
●
The cylinder No. signal is not in the normal
pattern during engine running.
●
Harness or connectors
(The sensor circuit is open or shorted)
●
Camshaft position sensor (PHASE)
●
Starter motor (Refer to
.)
●
Starting system circuit (Refer to
.)
●
Dead (Weak) battery
EC-380
DTC P0340 CMP SENSOR (PHASE)
DTC Confirmation Procedure
NBS001WK
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.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10.5V with igni-
tion switch ON.
WITH CONSULT-II
1.
Turn ignition switch ON.
2.
Select “DATA MONITOR” mode with CONSULT-II.
3.
Crank engine for at least 2 seconds and run it for at least 5 sec-
onds at idle speed.
4.
If 1st trip DTC is detected, go to
EC-382, "Diagnostic Procedure"
.
If 1st trip DTC is not detected, go to next step.
5.
Maintain engine speed at more than 800 rpm for at least 5 sec-
onds.
6.
If 1st trip DTC is detected, go to
EC-382, "Diagnostic Procedure"
.
WITH GST
Follow the procedure WITH CONSULT-II above.
SEF058Y
DTC P0340 CMP SENSOR (PHASE)
EC-381
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Wiring Diagram
NBS001WL
TBWM1231E
EC-382
DTC P0340 CMP SENSOR (PHASE)
Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-II.
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.
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
Diagnostic Procedure
NBS001WM
1.
CHECK STARTING SYSTEM
Turn ignition switch to START position.
Yes or No
Yes
>> GO TO 2.
No
>> Check starting system. (Refer to
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
14
L/W
Camshaft position sensor
(PHASE)
[Engine is running]
●
Warm-up condition
●
Idle speed
NOTE:
The pulse cycle changes depending on rpm
at idle
1.0 - 4.0V
[Engine is running]
●
Engine speed: 2,000 rpm
1.0 - 4.0V
111
W/B
ECM relay
(Self shut-off)
[Engine is running]
[Ignition switch: OFF]
●
For a few seconds after turning ignition
switch OFF
0 - 1.5V
[Ignition switch: OFF]
●
More than a few seconds after turning igni-
tion switch OFF
BATTERY VOLTAGE
(11 - 14V)
119
120
R
R
Power supply for ECM
[Ignition switch: ON]
BATTERY VOLTAGE
(11 - 14V)
PBIB1039E
PBIB1040E
Does the engine turn over?
Does the starter motor operate?
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