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 

SC-9, "START-

ING SYSTEM"

 .)

●

Starting system circuit (Refer to 

SC-9, 

"STARTING SYSTEM"

 .)

●

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 

SC-9, "STARTING SYSTEM"

 .)

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?