Infiniti M45 (Y34). Manual - part 407

DTC P0340 CMP SENSOR (PHASE)

EC-317

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DTC P0340 CMP SENSOR (PHASE)

PFP:23731

Component Description

ABS002JO

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. 

On Board Diagnosis Logic

ABS002JP

DTC Confirmation Procedure

ABS002JR

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-319, "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-319, "Diagnostic Procedure"

.

 WITH GST

Follow the procedure WITH CONSULT-II above.

PBIB0562E

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

 .)

●

Starting system circuit (Refer to 

SC-9

 .)

●

Dead (Weak) battery

SEF058Y

EC-318

DTC P0340 CMP SENSOR (PHASE)

Wiring Diagram

ABS002JS

TBWA0289E

DTC P0340 CMP SENSOR (PHASE)

EC-319

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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

ABS002JT

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"

 .)

2. 

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

2.

Loosen and retighten two ground screws. 
Refer to 

EC-141, "Ground Inspection"

 .

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace ground connections.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

84

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

PBIB0056E

PBIB0057E

Does the engine turn over?

Does the starter motor operate?

PBIB1118E

EC-320

DTC P0340 CMP SENSOR (PHASE)

3. 

CHECK CAMSHAFT POSITION (CMP) SENSOR (PHASE) POWER SUPPLY CIRCUIT

1.

Disconnect camshaft position (CMP) sensor (PHASE) harness
connector.

2.

Turn ignition switch ON.

3.

Check voltage between CMP sensor (PHASE) terminal 3 and
ground with CONSULT-II or tester.

4.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 4.

4. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors F105, M135

●

Harness for open or short between ECM and camshaft position sensor (PHASE)

●

Harness for open or short between ECM relay and camshaft position sensor (PHASE)

>> Repair open circuit or short to ground or short to power in harness or connectors.

5. 

CHECK CMP SENSOR (PHASE) GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Check harness continuity between CMP sensor (PHASE) terminal 1 and ground.

3.

Also check harness for short to power.

OK or NG

OK

>> GO TO 7.

NG

>> GO TO 6.

6. 

DETECT MALFUNCTIONING PART

Check the following.

●

Joint connector-29

●

Harness for open or short between camshaft position sensor (PHASE) and ground

>> Repair open circuit or short to power in harness or connectors.

PBIB0023E

Voltage: Battery voltage

SEF481Y

Continuity should exist.