Last Modified: 4-30-2014 6.6 C Doc ID: RM000000TCW00NX
Model Year: 2006 Model: LX470 Prod Date Range: [05/2005 -           ]
Title: 2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0335,P0339; Crankshaft Position Sensor "A" Circuit; 2006 MY LX470 [05/2005 -        ]

DTC

P0335

Crankshaft Position Sensor "A" Circuit

DTC

P0339

Crankshaft Position Sensor "A" Circuit Intermittent

DESCRIPTION

The Crankshaft Position (CKP) sensor system consists of a CKP sensor plate and a magnetic coil.

The sensor plate has 34 teeth and is installed on the crankshaft. The pickup coil is made of windings, an iron core and magnet. The sensor plate rotates and as each tooth passes through the pickup coil, a pulse signal is created. The pickup coil generates 34 signals for each engine revolution. Based on these signals, the ECM calculates the crankshaft position and engine RPM. Using these calculations, the fuel injection time and ignition timing are controlled.

DTC No.

DTC Detection Condition

Trouble Area

P0335
  • No CKP position sensor signal to ECM during cranking (1 trip detection logic)
  • No CKP sensor signal to ECM with engine at 600 rpm or more (1 trip detection logic)
  • Open or short in Crankshaft Position (CKP) sensor circuit
  • Crankshaft Position (CKP) sensor
  • Signal plate (CKP sensor plate)
  • ECM

P0339

No CKP sensor signal to ECM is input for 0.05 seconds or more, and conditions (a), (b) and (c) are met:

(a) 1,000 rpm or more

(b) Starter is OFF

(c) 3 seconds or more have elapsed after STA signal is switched from ON or OFF
  • Open or short in CKP sensor circuit
  • CKP sensor
  • Signal plate (CKP sensor plate)
  • ECM
  • Reference: Inspect using an oscilloscope.

    The correct waveform is as shown.

    Tester Connection

    Specified Condition

    E6-25 (VV1+) - E6-24 (VV1-)

    Correct waveform is as shown

    E6-18 (VV2+) - E6-28 (VV2-)

    Correct waveform is as shown

    E6-21 (NE+) - E6-20 (NE-)

    Correct waveform is as shown

MONITOR DESCRIPTION

If there is no signal from the Crankshaft Position (CKP) sensor even though the engine is revolving, the ECM interprets this as a malfunction of the sensor.

This monitor runs for 10 seconds (the first 10 seconds of engine idle) after the engine is started.

MONITOR STRATEGY

Related DTCs

Crankshaft position sensor range check or rationality

Required Sensors/Components

Crankshaft position (CKP) sensor

Required Sensors/Components

-

Frequency of Operation

Continuous

Duration

3 times

MIL Operation

Immediate

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

All:

The monitor will run whenever these DTCs are not present

None

Case 1:

Time after starter ON to OFF

0.3 seconds or more

Number of camshaft position sensor signal pulse

6 times

Battery voltage

7 V or more

Ignition switch

ON

Case 2:

Starter

OFF

Engine RPM

More than 450 rpm

Time after starter from ON to OFF

3 seconds or more

TYPICAL MALFUNCTION THRESHOLDS

Case 1:

Number of CKP sensor signal pulse

132 or less, or 174 or more

Case 2:

Engine speed signal

No signal

COMPONENT OPERATING RANGE

CKP signal
  • CKP sensor voltage fluctuates when crankshaft rotates
  • 34 signals per revolution of crankshaft

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

  • If no problem is found by this diagnostic troubleshooting procedure, troubleshoot the engine mechanical system.
  • Check the engine speed. The engine speed can be checked by using the intelligent tester. To check, follow the operation below:
    1. Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
    2. Start the engine.
    3. Turn the tester ON.
    4. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / ENGINE SPD.
  • The engine speed may be indicated as zero despite the engine revolving normally. This is caused by a lack of NE signals from the crankshaft position (CKP) sensor. Alternatively, the engine speed may be indicated as lower than the actual engine speed if the CKP sensor output voltage is insufficient.
  • Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE

1.

INSPECT CRANKSHAFT POSITION SENSOR

(a) Disconnect the C3 Crankshaft Position (CKP) sensor connector.

(b) Measure the resistance of the sensor.

Standard resistance:

Tester Connection

Condition

Specified Condition

1 - 2

Cold

1,630 to 2,740 Ω

1 - 2

Hot

2,065 to 3,225 Ω

NOTICE:

In the above section, the terms "cold" and "hot" refer to the temperature of the coils.

"Cold" means approximately -10 to 50°C (14 to 122°F).

"Hot" means approximately 50 to 100°C (122 to 212°F).
NG

REPLACE CRANKSHAFT POSITION SENSOR

OK

2.

CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)

(a) Check harness and connector 2006 MY LX470 [05/2005 -        ]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: ELECTRONIC CIRCUIT INSPECTION PROCEDURE .

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

CHECK SENSOR INSTALLATION (CRANKSHAFT POSITION SENSOR)

(a) Check the sensor installation.

OK:

Sensor is installed correctly.
NG

SECURELY REINSTALL SENSOR

OK

4.

CHECK CRANKSHAFT POSITION SENSOR PLATE (TOOTH OF PLATE)

(a) Remove the crankshaft position sensor plate 2006 MY LX470 [05/2005 -        ]; 2UZ-FE ENGINE MECHANICAL: TIMING BELT: REMOVAL .

(b) Check the tooth of the signal plate.

OK:

Sensor plate does not have any cracks or deformation.

NG

REPLACE CRANKSHAFT POSITION SENSOR PLATE

OK

REPLACE ECM