Last Modified: 11-29-2007 1.6 C
Service Category: Engine/Hybrid System Section: Engine Control
Model Year: 2008 Model: Sequoia Doc ID: RM000000TCW079X
Title: 3UR-FE ENGINE CONTROL: SFI SYSTEM: DESCRIPTION (2008 Sequoia)

DTC

P0335

Crankshaft Position Sensor "A" Circuit

DTC

P0337

Crankshaft Position Sensor "A" Circuit Low Input

DTC

P0338

Crankshaft Position Sensor "A" Circuit High Input

DTC

P0339

Crankshaft Position Sensor "A" Circuit Intermittent

DESCRIPTION

The crankshaft position (CKP) sensor system consists of a crank angle sensor plate and Magnetic Resistance Element (MRE) type sensor. The crank angle sensor plate has 34 teeth at 10° intervals (2 teeth are missing for detecting top dead center), and is installed to the rear end of the crankshaft. The crank position sensor outputs 34 rotation signals per engine revolution. The ECM uses the G2 signal to distinguish between the cylinders, and uses the NE signal to detect the crankshaft position and engine rpm.

DTC No.

DTC Detection Condition

Trouble Area

P0335
  • No CKP sensor signal to ECM while cranking (1 trip detection logic)
  • No CKP sensor signal to ECM at engine speed of 600 rpm or more (1 trip detection logic)
  • Open or short in CKP sensor circuit
  • CKP sensor
  • CKP sensor plate
  • ECM

P0337

Output voltage of CKP sensor 0.3 V or less for 4 seconds (1 trip detection logic)
  • Open or short in CKP sensor circuit
  • CKP sensor
  • CKP sensor plate
  • ECM

P0338

Output voltage of CKP sensor 4.7 V or more for 4 seconds (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.

Standard:

Tester Connection

Tool Setting

Condition

Specified Condition

D56-110 (NE+) - D56-111 (NE-)

5 V/DIV., 20 msec./DIV.

Cranking or idling

The correct waveform is as shown

D56-90 (G2) - D56-89 (G2-)

5 V/DIV., 20 msec./DIV.

Cranking or idling

The correct waveform is as shown

HINT:

G2 stands for the camshaft position sensor signal, and NE stands for the crankshaft position sensor signal.

MONITOR DESCRIPTION

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

When the sensor output voltage remains at less than 0.3 V, or more than 4.7 V for more than 4 seconds, the ECM stores a DTC.

MONITOR STRATEGY

Related DTCs

P0335: Crankshaft position sensor range check/rationality

P0337: Crankshaft position sensor check (Low voltage)

P0338: Crankshaft position sensor check (High voltage)

Required sensors/Components (Main)

Crankshaft Position (CKP) sensor

Required sensors/Components (Related)

Camshaft position sensor

Frequency of operation

Continuous

Duration

P0335: 4.7 seconds

P0337, P0338: 4 seconds

MIL operation

Immediate

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

All

Monitor runs whenever following DTCs not present

None

P0335: Crankshaft Position Sensor Range Check

Case 1

Engine speed

450 rpm or more

Starter

OFF

Time after starter turned from ON to OFF

3 seconds or more

CKP sensor voltage

0.3 to 4.7 V

Case 2

Starter

ON

Minimum battery voltage while starter ON

Less than 11 V

CKP sensor voltage

0.3 to 4.7 V

P0337, P0338 Crankshaft Position Sensor Range Check (Low Voltage, High Voltage)

Battery voltage

8 V or more

Ignition switch

ON

Starter

OFF

TYPICAL MALFUNCTION THRESHOLDS

P0335 Crankshaft Position Sensor Range Check

Engine speed signal

No signal

P0337 Crankshaft Position Sensor Range Check (Low Voltage)

CKP sensor voltage

Less than 0.3 V

P0338 Crankshaft Position Sensor Range Check (High Voltage)

CKP sensor voltage

More than 4.7 V

COMPONENT OPERATING RANGE

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

CKP sensor voltage

0.3 to 4.7 V

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

  • If no problem is found by this diagnostic troubleshooting procedure, check for problems by referring to the engine mechanical section.
  • The engine speed can be checked by using the Techstream. To check, follow the procedures below:
    1. Connect the Techstream to the DLC3.
    2. Start the engine.
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Engine Speed.
  • Read freeze frame data using the Techstream. 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.

READ VALUE USING TECHSTREAM (ENGINE SPEED)

(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.

Standard:

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 zero (0), there may be an open or short in the Crankshaft Position (CKP) sensor circuit.

OK

2.

INSPECT CRANKSHAFT POSITION SENSOR (SENSOR POWER SOURCE)


(a) Disconnect the crankshaft position sensor connector.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

D1-3 - Body ground

Ignition switch ON

4.5 to 5.0 V
OK

3.

CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)


(a) Disconnect the crankshaft position 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

D1-1 - D56-110 (NE+)

Always

Below 1 Ω

D1-2 - D56-111 (NE-)

Always

Below 1 Ω

D1-1 or D56-110 (NE+) - Body ground

Always

10 kΩ or higher

D1-2 or D56-111 (NE-) - Body ground

Always

10 kΩ or higher
OK

4.

CHECK SENSOR INSTALLATION (CRANKSHAFT POSITION SENSOR)


(a) Check the crankshaft position sensor installation.

OK:

Sensor is installed correctly.

OK

5.

INSPECT CRANKSHAFT POSITION SENSOR PLATE (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 3UR-FE ENGINE CONTROL: CRANKSHAFT POSITION SENSOR: REMOVAL (2008 Sequoia) .

NEXT

7.

CHECK WHETHER DTC OUTPUT RECURS (DTC P0335, P0337, P0338 AND/OR P0339)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Clear DTCs 3UR-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, P0337, P0338 or P0339 are output

B

HINT:

If the engine does not start, replace the ECM.

A

8.

CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)


(a) Disconnect the crankshaft position 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

D1-3 - D56-66 (VCV2)

Always

Below 1 Ω

D1-3 or D56-66 (VCV2) - Body ground

Always

10 kΩ or higher
OK