P0335 CKP SENSOR (POS) > DESCRIPTION

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P0335 CKP SENSOR (POS) > DESCRIPTION

The crankshaft position sensor (POS) is located on the oil pan facing the gear teeth (cogs) of the signal plate. It detects the fluctuation of the engine revolution.

The sensor consists of a permanent magnet and Hall IC.

When the 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.

The ECM receives the voltage signal and detects the fluctuation of the engine revolution. Fig 1: Identifying CKP Sensor

ECM receives the signals as shown in the figure.

Service Manual: ENGINE CONTROL SYSTEM (VQ35DE) Print Date: 7/10/2019 2007 Nissan Altima 3.5L Eng VIN B SL

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Fig 2: Blinking Pattern For ECM

P0335 CKP SENSOR (POS) > DTC LOGIC > DTC DETECTION LOGIC

DTC DETECTING CONDITION AND POSSIBLE CAUSE

DTC No.

Trouble diagnosis

name

DTC detecting condition Possible cause

P0335

Crankshaft position sensor (POS) circuit

The crankshaft position sensor (POS) signal is not detected by the ECM during the first few seconds of engine cranking.

The proper pulse signal from the crankshaft position sensor (POS) is not sent to ECM while the engine is running.

The crankshaft position sensor (POS) signal is not in the normal pattern during engine

running. Harness or connectors [CKP sensor (POS) circuit is open or shorted.] (APP sensor 2 circuit is shorted.) (EVAP control system pressure sensor circuit is shorted.) (Refrigerant pressure sensor circuit is shorted.) Crankshaft position sensor (POS) Accelerator pedal position sensor EVAP control system pressure sensor Refrigerant pressure sensor Signal plate

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P0335 CKP SENSOR (POS) > DIAGNOSIS PROCEDURE

1. CHECK GROUND CONNECTION 1. Turn ignition switch OFF.

2. Check ground connection E9. Refer to Ground Inspection in "CIRCUIT INSPECTION ". OK or NG

OK: GO TO 2.

NG: Repair or replace ground connection.

2. CHECK CRANKSHAFT POSITION (CKP) SENSOR (POS) POWER SUPPLY CIRCUIT-I 1. Disconnect crankshaft position (CKP) sensor (POS) harness connector.

2. Turn ignition switch ON.

3. Check the voltage between CKP sensor (POS) harness connector and ground. CONNECTOR TERMINAL VOLTAGE SPECIFICATION

CKP sensor (POS)

Ground Voltage (V)

Connector Terminal

F30 1 Ground Approx. 5

Is the inspection result normal? YES: GO TO 8.

NO: GO TO 3.

3. CHECK CRANKSHAFT POSITION (CKP) SENSOR (POS) POWER SUPPLY CIRCUIT-II 1. Turn ignition switch ON.

2. Disconnect ECM harness connector.

3. Check the continuity between CKP sensor (POS) harness connector and ECM harness connector. CONNECTOR TERMINAL CONTINUITY SPECIFICATION

CKP sensor (POS) ECM

Continuity

Connector Terminal Connector Terminal

F30 1 F13 76 Existed

NO: Repair open circuit.

4. CHECK CRANKSHAFT POSITION (CKP) SENSOR (POS) POWER SUPPLY CIRCUIT-III Check harness for short to power and short to ground, between the following terminals. ECM CONNECTOR TERMINAL REFERENCE

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ECM Sensor

Connector Terminal Name Connector Terminal

F13 72 Refrigerant pressure sensor E219 1

76 CKP sensor (POS) F30 1

E10 87 APP sensor E40 6

91 EVAP control system pressure sensor B41 3

NO: Repair short to ground or short to power in harness or connectors. 5. CHECK COMPONENTS

Check the following.

1. EVAP control system pressure sensor (Refer to "COMPONENT INSPECTION ".) 2. Refrigerant pressure sensor (Refer to "DIAGNOSIS PROCEDURE ".)

NO: Replace malfunctioning components. 6. CHECK APP SENSOR

Refer to "COMPONENT INSPECTION ". Is the inspection result normal? YES: GO TO 12.

NO: GO TO 7.

7. REPLACE ACCELERATOR PEDAL ASSEMBLY 1. Replace accelerator pedal assembly.

2. Go to "SPECIAL REPAIR REQUIREMENT ". : INSPECTION END

8. CHECK CKP SENSOR (POS) GROUND CIRCUIT FOR OPEN AND SHORT 1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

Continuity

4. Also check harness for short to ground and short to power. Is the inspection result normal?

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NO: Repair open circuit or short to ground or short to power in harness or connectors. 9. CHECK CKP SENSOR (POS) INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

Continuity

Continuity should exist.

2. Also check harness for short to ground and short to power. Is the inspection result normal?

YES: GO TO 10.

NO: Repair open circuit or short to ground or short to power in harness or connectors. 10. CHECK CRANKSHAFT POSITION SENSOR (POS)

Refer to "COMPONENT INSPECTION ". Is the inspection result normal? YES: GO TO 11.

NO: Replace crankshaft position sensor (POS). 11. CHECK GEAR TOOTH

Visually check for chipping signal plate gear tooth. Is the inspection result normal?

YES: GO TO 12.

NO: Replace the signal plate. 12. CHECK INTERMITTENT INCIDENT

Refer to "INTERMITTENT INCIDENT ". : INSPECTION END

P0335 CKP SENSOR (POS) > COMPONENT INSPECTION

1. CHECK CRANKSHAFT POSITION SENSOR (POS)-I 1. Loosen the fixing bolt of the sensor.

2. Disconnect crankshaft position sensor (POS) harness connector. 3. Remove the sensor.

4. Visually check the sensor for chipping. Is the inspection result normal? YES: GO TO 2.

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Fig 1: Checking Sensor Chipping

2. CHECK CRANKSHAFT POSITION SENSOR (POS)-II

Check resistance crankshaft position sensor (POS) terminals as follows. CONNECTOR TERMINAL RESISTANCE SPECIFICATION

Terminal No. (Polarity) Resistance

1 (+) - 2 (-)

Except 0 or ∞ Ω [at 25°C (77°F)] 1 (+) - 3 (-)

2 (+) - 3 (-)

Is the inspection result normal? YES: INSPECTION END

NO: Replace crankshaft position sensor (POS)

P0420, P0430 THREE WAY CATALYST FUNCTION > DTC LOGIC > 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 (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.

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When the frequency ratio of A/F sensor 1 and heated oxygen sensor 2 approaches a specified limit value, the three way catalyst (manifold) malfunction is diagnosed.

Fig 1: Checking Three Way Catalyst Function

DTC DETECTING CONDITION AND POSSIBLE CAUSE

DTC

No. Trouble diagnosis name DTC detecting condition Possible cause

P0420 Catalyst system efficiency below threshold (bank 1)

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 injector Fuel injector leaks Spark plug Improper ignition timing P0430 Catalyst system efficiency

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P0420, P0430 THREE WAY CATALYST FUNCTION > COMPONENT FUNCTION CHECK

1. PERFORM COMPONENT FUNCTION CHECK Without CONSULT-III

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 at least 1 minute under no load.

4. Let engine idle for 1 minute. 5. Open engine hood.

6. Check the voltage between ECM harness connector and ground under the following condition. CONNECTOR TERMINAL VOLTAGE SPECIFICATION

DTC

ECM

Ground Condition Voltage

Connector Terminal P0420

F13

33

Ground

Keeping engine speed at 2500 RPM constant under

no load

The voltage fluctuation cycle takes more than 5

seconds.

1. 1 cycle: 0.6-1.0 --> 0-0.3 --> 0.6-1.0

P0430 34

Is the inspection result normal? YES: INSPECTION END

NO: Go to "DIAGNOSIS PROCEDURE ".

P0420, P0430 THREE WAY CATALYST FUNCTION > DIAGNOSIS PROCEDURE

1. CHECK EXHAUST SYSTEM

Visually check exhaust tubes and muffler for dent. Is the inspection result normal?

YES: GO TO 2. NO: Repair or replace.

2. CHECK EXHAUST GAS LEAK 1. Start engine and run it at idle.

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Fig 1: Checking Exhaust Gas Leak

Is exhaust gas leak detected? YES: Repair or replace.

NO: GO TO 3.

3. CHECK INTAKE AIR LEAK

Listen for an intake air leak after the mass air flow sensor. Is intake air leak detected?

YES: Repair or replace. NO: GO TO 4.

4. CHECK IGNITION TIMING

Check the following items. Refer to "BASIC INSPECTION: SPECIAL REPAIR REQUIREMENT ". ITEMS SPECIFICATIONS

Items Specifications

Target idle speed CVT: 600 ± 50 RPM (in P or N position) M/T: 600 ± 50 RPM (in Neutral position) Ignition timing CVT: 12 ± 5° BTDC (in P or N position)

M/T: 12 ± 5° BTDC (in Neutral position) Is the inspection result normal?

YES: GO TO 5.

NO: Follow the "BASIC INSPECTION: SPECIAL REPAIR REQUIREMENT ". 5. CHECK FUEL INJECTORS

1. Stop engine and then turn ignition switch ON.

2. Check the voltage between ECM harness connector and ground. CONNECTOR TERMINAL VOLTAGE SPECIFICATION

ECM

Ground Voltage (V)

Connector Terminal

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29 30 31 32 Is the inspection result normal? YES: GO TO 6.

NO: Perform "DIAGNOSIS PROCEDURE ". 6. CHECK FUNCTION OF IGNITION COIL-I

CAUTION: Do the following procedure in the place where

ventilation is good without the combustible.

1. Turn ignition switch OFF.

2. Remove fuel pump fuse in IPDM E/R to release fuel pressure.

NOTE: Do not use CONSULT-III to release fuel pressure,

or fuel pressure applies again during the following procedure.

3. Start engine.

4. After engine stalls, crank it two or three times to release all fuel pressure. 5. Turn ignition switch OFF.

6. Remove all ignition coil harness connectors to avoid the electrical discharge from the ignition coils.

7. Remove ignition coil and spark plug of the cylinder to be checked.

8. Crank engine for 5 seconds or more to remove combustion gas in the cylinder. 9. Connect spark plug and harness connector to ignition coil.

10. Fix ignition coil using a rope etc. with gap of 13-17 mm (0.52-0.66 in) between the edge of the spark plug and grounded metal portion as shown in the figure.

11. Crank engine for about 3 seconds, and check whether spark is generated between the spark plug and the grounded metal portion.

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Fig 2: Checking For Spark

Spark should be generated.

CAUTION:

1. Do not approach to the spark plug and the ignition coil

within 50 cm (19.7 in). Be careful not to get an

electrical shock while checking, because the electrical

discharge voltage becomes 20kV or more.

2. It might cause to damage the ignition coil if the gap of

more than 17 mm (0.66 in) is taken.

NOTE: When the gap is less than 13 mm (0.52 in), the

spark might be generated even if the coil is malfunctioning.

Is the inspection result normal?

YES: GO TO 10. NO: GO TO 7.

7. CHECK FUNCTION OF IGNITION COIL-II 1. Turn ignition switch OFF.

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2. Disconnect spark plug and connect a known-good spark plug.

3. Crank engine for about 3 seconds, and recheck whether spark is generated between the spark plug and the grounded metal portion.

Spark should be generated. Is the inspection result normal? YES: GO TO 8.

NO: Check ignition coil, power transistor and their circuit. Refer to "DIAGNOSIS PROCEDURE ". 8. CHECK SPARK PLUG

Check the initial spark plug for fouling, etc. Is the inspection result normal?

YES: Replace spark plug(s) with standard type one(s). For spark plug type, refer to "SPARK PLUG (PLATINUM-TIPPED TYPE): REMOVAL AND INSTALLATION ".

NO: Repair or clean spark plug. Then GO TO 9. Fig 3: Identifying Spark Plug Tip

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9. CHECK FUNCTION OF IGNITION COIL-III 1. Reconnect the initial spark plugs.

2. Crank engine for about three seconds, and recheck whether spark is generated between the spark plug and the grounded portion.

Spark should be generated. Is the inspection result normal? YES: INSPECTION END

NO: Replace spark plug(s) with standard type one(s). For spark plug type, refer to "SPARK PLUG (PLATINUM-TIPPED TYPE): REMOVAL AND INSTALLATION ".

10. CHECK FUEL INJECTOR 1. Turn ignition switch OFF. 2. Remove fuel injector assembly.

Refer to "REMOVAL AND INSTALLATION ".

Keep fuel hose and all fuel injectors connected to fuel tube. 3. Disconnect all ignition coil harness connectors.

4. Reconnect all fuel injector harness connectors disconnected. 5. Turn ignition switch ON.

Make sure fuel does not drip from fuel injector. Does fuel drip from fuel injector?

YES: Replace the fuel injector(s) from which fuel is dripping. NO: GO TO 11.

11. CHECK INTERMITTENT INCIDENT Refer to "INTERMITTENT INCIDENT ". Is the trouble fixed?

YES: INSPECTION END