Last Modified: 11-29-2007 1.6 C
Service Category: Engine/Hybrid System Section: Engine Control
Model Year: 2008 Model: Sequoia Doc ID: RM000000TCW07AX
Title: 2UZ-FE ENGINE CONTROL: SFI SYSTEM: DESCRIPTION (2008 Sequoia)

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 pickup coil.

The sensor plate has 34 teeth and is installed on the crankshaft. The pickup coil is made of wound copper wire, an iron core and magnet. The sensor plate rotates and, as each tooth passes by the pickup coil, a pulse signal is created. The pickup coil generates 34 signals per 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

When either condition below is met:

  • No CKP sensor signal to ECM while cranking (1 trip detection logic)
  • No CKP sensor signal to ECM at engine speed of 450 rpm or more (1 trip detection logic)
  • Open or short in CKP sensor circuit
  • CKP sensor
  • CKP sensor plate
  • ECM

P0339

Under conditions (a), (b) and (c), no CKP sensor signal to ECM for 0.05 seconds or more

(1 trip detection logic):

(a) Engine speed 1000 rpm or more

(b) Starter signal OFF

(c) 3 seconds or more have elapsed since starter signal switched from ON to OFF
  • Open or short in CKP sensor circuit
  • CKP sensor
  • CKP sensor plate
  • ECM

Reference: Inspection using an oscilloscope.

HINT:

  • The correct waveform is as shown.
  • VV1+ and VV2+ stand for the VVT sensor signal, and NE+ stands for the CKP sensor signal.
  • Grounding failure of the shielded wire may cause noise in waveforms.

Item

Content

Terminal

VV1+ - VV1-

VV2+ - VV2-

NE+ - NE-

Equipment Setting

2 V/DIV.,

20 msec./DIV.

Condition

Cranking or idling

MONITOR DESCRIPTION

If there is no signal from the CKP sensor despite the engine revolving, the ECM interprets this as a malfunction of the sensor.

If the malfunction is not repaired successfully, a DTC is stored 10 seconds after the engine is next started.

MONITOR STRATEGY

Related DTCs

P0335: CKP sensor range check or rationality

Required Sensors/Components (Main)

CKP sensor

Required Sensors/Components (Related)

CMP sensor

Frequency of Operation

Continuous

Duration

3 times

MIL Operation

Immediate

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

All

Monitor runs whenever following DTCs not present

None

Case 1

Time after starter OFF to ON

0.3 seconds or more

Number of CMP sensor signal pulse

6 times

Battery voltage

7 V or more

CMP sensor circuit failure

Not detected

Ignition switch

ON

Case 2

Starter

OFF

Engine speed

450 rpm or more

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, and 174 or more

Case 2

Engine speed signal

No signal

COMPONENT OPERATING RANGE

CKP sensor
  • CKP sensor output voltage fluctuates while crankshaft revolving
  • 34 CKP sensor signals per crankshaft revolution

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

  • If no problem is found through this diagnostic troubleshooting procedure, troubleshoot the engine mechanical systems.
  • Check the engine speed. The engine speed can be checked by using the Techstream. To check, follow the operation below:
    1. Connect the Techstream to the DLC3.
    2. Start the engine.
    3. Turn the Techstream ON.
    4. Enter the following menus: Powertrain / Engine / Data List / All Data / Engine Speed.
  • Read freeze frame data using the Techstream. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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.

READ VALUE USING TECHSTREAM (ENGINE SPD)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream ON.

(d) Enter the following menus: Powertrain / Engine / Data List / All Data / Engine Speed.

(e) Start the engine.

(f) Read the values displayed on the Techstream while the engine is running.

OK:

Correct values are displayed.

HINT:

  • To check the engine speed change, display the graph on the Techstream.
  • If the engine does not start, check the engine speed while cranking.
  • If the engine speed indicated on the Techstream remains at zero (0), there may be an open or short in the Crankshaft Position (CKP) sensor circuit.

OK

2.

INSPECT CRANKSHAFT POSITION SENSOR (RESISTANCE)


(a) Disconnect the CKP sensor connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

1 - 2

Cold

1630 to 2740 Ω

1 - 2

Hot

2065 to 3225 Ω

HINT:

In the above chart, the terms "cold" and "hot" refer to the temperature of the sensor.

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

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

OK

3.

CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)


(a) Disconnect the CKP sensor connector.

(b) Disconnect the ECM connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

D58-1 (NE+) - D56-110 (NE+)

Always

Below 1 Ω

D58-2 (NE-) - D56-111 (NE-)

Always

Below 1 Ω

D58-1 (NE+) or D56-110 (NE+) - Body ground

Always

10 kΩ or higher

D58-2 (NE-) or D56-111 (NE-) - Body ground

Always

10 kΩ or higher
OK

4.

CHECK SENSOR INSTALLATION (CRANKSHAFT POSITION SENSOR)


(a) Check the CKP sensor installation.

OK:

Sensor is installed correctly.

OK

5.

INSPECT CRANKSHAFT POSITION SENSOR PLATE NO. 1 (TEETH OF SENSOR PLATE)

(a) Check the teeth of the sensor plate.

OK:

Sensor plate does not have any cracks or deformation.

OK

6.

REPLACE CRANKSHAFT POSITION SENSOR

(a) Replace the crankshaft position sensor 2UZ-FE ENGINE CONTROL: CRANKSHAFT POSITION SENSOR: REMOVAL (2008 Sequoia) .

NEXT

7.

CHECK WHETHER DTC OUTPUT RECURS

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream ON.

(d) Clear DTCs 2UZ-FE ENGINE CONTROL: SFI SYSTEM: DTC CHECK / CLEAR (2008 Sequoia) .

(e) Start the engine.

(f) Enter the following menus: Powertrain / Engine / Trouble Codes.

(g) Read DTCs.

Result

Result

Proceed to

No DTC is output

A

P0335 or P0339 is output

B

HINT:

If the engine does not start, replace the ECM.

A