Infiniti FX35, FX50 (S51). Manual - part 684

P0340, P0345 CMP SENSOR

EC-277

< DTC/CIRCUIT DIAGNOSIS >

[VQ35HR]

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Check the following.
• Harness connectors F106, F107
• Harness for open or short between CMP sensor and ECM

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

11.

CHECK CMP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Check the continuity between CMP sensor harness connector and ECM harness connector.

2.

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

Is the inspection result normal?

YES

>> GO TO 13.

NO

>> GO TO 12.

12.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors F106, F107
• Harness for open or short between CMP sensor and ECM

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

13.

CHECK CMP SENSOR

Refer to 

EC-277, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 14.

NO

>> Replace malfunctioning camshaft position sensor.

14.

CHECK CAMSHAFT (INT)

Check the following.
• Accumulation of debris to the signal plate of camshaft rear end
• Chipping signal plate of camshaft rear end
Is the inspection result normal?

YES

>> GO TO 15.

NO

>> Remove debris and clean the signal plate of camshaft

rear end or replace camshaft.

15.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-36, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000005236872

1.

CHECK CAMSHAFT POSITION SENSOR-I

1.

Turn ignition switch OFF.

2.

Loosen the fixing bolt of the sensor.

3.

Disconnect camshaft position sensor harness connector.

DTC

CMP sensor

ECM

Continuity

Bank

Connector

Terminal

Connector

Terminal

P0340

1

F5

3

F102

59

Existed

P0345

2

F18

3

63

JMBIA0058ZZ

EC-278

< DTC/CIRCUIT DIAGNOSIS >

[VQ35HR]

P0340, P0345 CMP SENSOR

4.

Remove the sensor.

5.

Visually check the sensor for chipping.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Replace malfunctioning camshaft position sensor.

2.

CHECK CAMSHAFT POSITION SENSOR-II

Check resistance camshaft position sensor terminals as follows.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace malfunctioning camshaft position sensor.

JMBIA0065ZZ

Terminals (Polarity)

Resistance

1 (+) - 2 (-)

Except 0 or 

∞

 

Ω

 [at 25

°

C (77

°

F)]

1 (+) - 3 (-)

2 (+) - 3 (-)

P0420, P0430 THREE WAY CATALYST FUNCTION

EC-279

< DTC/CIRCUIT DIAGNOSIS >

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P0420, P0430 THREE WAY CATALYST FUNCTION

DTC Logic

INFOID:0000000005236873

DTC DETECTION LOGIC

The ECM monitors the switching frequency ratio of air fuel ratio (A/F) sensor 1 and heated oxygen sensor 2.
A three way catalyst 1 with high oxygen storage capacity will indicate a low switching frequency of heated oxy-
gen sensor 2. As oxygen storage capacity decreases, the heated oxygen sensor 2 switching frequency will
increase.
When the frequency ratio of A/F sensor 1 and heated oxygen sensor 2 approaches a specified limit value, the
three way catalyst 1 malfunction is diagnosed.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test.
1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Turn ignition switch ON.

3.

Turn ignition switch OFF and wait at least 10 seconds.

Will CONSULT-III be used?

YES

>> GO TO 2.

NO

>> GO TO 6.

2.

PERFORM DTC CONFIRMATION PROCEDURE-I

With CONSULT-III

TESTING CONDITION:
Do not maintain engine speed for more than the specified minutes below.
1.

Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT-III.

2.

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

3.

Turn ignition switch OFF and wait at least 10 seconds.

4.

Turn ignition switch ON.

5.

Turn ignition switch OFF and wait at least 10 seconds.

6.

Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

7.

Let engine idle for 1 minute.

8.

Check that “COOLAN TEMP/S” indicates more than 70

°

C (158

°

F).

If not, warm up engine and go to next step when “COOLAN TEMP/S” indication reaches to 70

°

C (158

°

F).

9.

Open engine hood.

10. Select “DTC & SRT CONFIRMATION” then “SRT WORK SUPPORT” mode with CONSULT-III.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0420

Catalyst system efficiency 
below threshold (bank 1)

• Three way catalyst 1 does not operate 

properly.

• Three way catalyst 1 does not have enough 

oxygen storage capacity.

• Three way catalyst 1
• Exhaust tube
• Intake air leaks
• Fuel injector
• Fuel injector leaks
• Spark plug
• Improper ignition timing

P0430

Catalyst system efficiency 
below threshold (bank 2)

PBIB1923E

EC-280

< DTC/CIRCUIT DIAGNOSIS >

[VQ35HR]

P0420, P0430 THREE WAY CATALYST FUNCTION

11. Rev engine between 2,000 and 3,000 rpm and hold it for 3 consecutive minutes then release the acceler-

ator pedal completely.

12. Check the indication of “CATALYST”.

Which is displayed on CONSULT-III screen?

CMPLT >> GO TO 5.
INCMP >> GO TO 3.

3.

PERFORM DTC CONFIRMATION PROCEDURE-II

1.

Wait 5 seconds at idle.

2.

Rev engine between 2,000 and 3,000 rpm and maintain it until “INCMP” of “CATALYST” changes to
“CMPLT” (It will take approximately 5 minutes).

Does the indication change to “CMPLT”?

YES

>> GO TO 5.

NO

>> GO TO 4.

4.

PERFORM DTC CONFIRMATION PROCEDURE AGAIN

1.

Stop engine and cool it down to less than 70

°

C (158

°

F).

2.

Perform DTC CONFIRMATION PROCEDURE again.

>> GO TO 2.

5.

PERFORM DTC CONFIRMATION PROCEDURE-III

Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>> Go to 

EC-281, "Diagnosis Procedure"

.

NO

>> INSPECTION END

6.

PERFORM COMPONENT FUNCTION CHECK

With GST

Perform component function check. Refer to 

EC-280, "Component Function Check"

.

NOTE:
Use component function check to check the overall function of the three way catalyst 1. During this check, a
1st trip DTC might not be confirmed.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-281, "Diagnosis Procedure"

.

Component Function Check

INFOID:0000000005236874

1.

PERFORM COMPONENT FUNCTION CHECK

With GST

1.

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

2.

Turn ignition switch OFF and wait at least 10 seconds.

3.

Turn ignition switch ON.

4.

Turn ignition switch OFF and wait at least 10 seconds.

5.

Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

6.

Let engine idle for 1 minute.

7.

Open engine hood.

8.

Check the voltage between ECM harness connector terminals under the following condition.