Infiniti F50. Manual - part 419

DTC P0340 CMP SENSOR (PHASE)

EC-317

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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

EBS00ME2

1. 

CHECK STARTING SYSTEM

Turn ignition switch to “START” position.

Yes or No

Yes

>> GO TO 2.

No

>> Check starting system. (Refer to 

SC-22, "STARTING SYSTEM"

 .)

2. 

RETIGHTEN GROUND SCREWS

1.

Turn ignition switch “OFF”.

2.

Loosen and retighten engine ground screws.

>> GO TO 3.

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 is 2,000 rpm.

1.0 - 4.0V

PBIB0056E

PBIB0057E

Does the engine turn over?

Does the starter motor operate?

PBIB0011E

EC-318

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 engine 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 engine ground

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

PBIB0023E

Voltage: Battery voltage

SEF481Y

Continuity should exist.

DTC P0340 CMP SENSOR (PHASE)

EC-319

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7. 

CHECK CMP SENSOR (PHASE) INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Disconnect ECM harness connector.

2.

Check harness continuity between ECM terminal 84 and CMP sensor (PHASE) terminal 2. 
Refer to Wiring Diagram.

3.

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

OK or NG

OK

>> GO TO 8.

NG

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

8. 

CHECK CAMSHAFT POSITION SENSOR (PHASE)

Refer to 

EC-319, "Component Inspection"

 .

OK or NG

OK

>> GO TO 9.

NG

>> Replace camshaft position sensor (PHASE).

9. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Component Inspection

EBS00ME3

CAMSHAFT POSITION SENSOR (PHASE)

1.

Loosen the fixing bolt of the sensor.

2.

Disconnect camshaft position sensor (PHASE) harness connec-
tor.

3.

Remove the sensor.

4.

Visually check the sensor for chipping.

5.

Check resistance as shown in the figure.

Removal and Installation

EBS00ME4

CAMSHAFT POSITION SENSOR (PHASE)

Refer to 

EM-35, "TIMING CHAIN"

 .

Continuity should exist.

PBIB0563E

Terminal No. (Polarity)

Resistance 

Ω

 [at 25

°

C (77

°

F)]

3 (+) - 1 (-)

Except 0 or 

∞

2 (+) - 1 (-)

3 (+) - 2 (-)

PBIB0564E

EC-320

DTC P0420, P0430 THREE WAY CATALYST FUNCTION

DTC P0420, P0430 THREE WAY CATALYST FUNCTION

PFP:20905

On Board Diagnosis Logic

EBS00ME5

The ECM monitors the switching frequency ratio of heated oxygen
sensors 1 and 2.
A three way catalyst (Manifold) with high oxygen storage capacity
will indicate a low switching frequency of heated oxygen sensor 2.
As oxygen storage capacity decreases, the heated oxygen sensor 2
switching frequency will increase.
When the frequency ratio of heated oxygen sensors 1 and 2
approaches a specified limit value, the three way catalyst (Manifold)
malfunction is diagnosed.
Malfunction is detected when three way catalyst (Manifold) does not
operate properly, three way catalyst (Manifold) does not have
enough oxygen storage capacity.

DTC Confirmation Procedure

EBS00ME6

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

TESTING CONDITION:
Do not hold engine speed for more than the specified minutes below.

1.

Start engine and warm it up to the normal operating temperature.

2.

Turn ignition switch “OFF” and wait at least 10 seconds.

3.

Start engine and keep the engine speed between 3,500 and 4,000 rpm for one minute under no load.

4.

Let engine idle for one minute.

5.

Open engine hood.

6.

Select “DTC & SRT CONFIRMATION” then “SRT WORK SUP-
PORT” mode with CONSULT-II.

7.

Rev engine up to 2,000 to 3,000 rpm and hold it for 3 consecu-
tive minutes then release the accelerator pedal completely.
If “INCMP” of “CATALYST” changed to “CMPLT”, go to step 10.

8.

Wait 5 seconds at idle.

SEF484YF

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0420
0420
(Bank 1)

Catalyst system efficiency 
below threshold

●

Three way catalyst (Manifold) does not operate 
properly.

●

Three way catalyst (Manifold) does not have 
enough oxygen storage capacity.

●

Three way catalyst (Manifold)

●

Exhaust tube

●

Intake air leaks

●

Fuel injectors

●

Fuel injector leaks

●

Spark plug

●

Improper ignition timing

P0430
0430
(Bank 2)

SEF940Z