Last Modified: 11-29-2007 1.6 C
Service Category: Engine/Hybrid System Section: Engine Control
Model Year: 2008 Model: Sequoia Doc ID: RM000000WBZ041X
Title: 3UR-FE ENGINE CONTROL: SFI SYSTEM: DESCRIPTION (2008 Sequoia)

DTC

P0340

Camshaft Position Sensor Circuit Malfunction

DTC

P0342

Camshaft Position Sensor "A" Circuit Low Input (Bank 1 or Single Sensor)

DTC

P0343

Camshaft Position Sensor "A" Circuit High Input (Bank 1 or Single Sensor)

DTC

P0345

Camshaft Position Sensor "A" Circuit (Bank 2)

DTC

P0347

Camshaft Position Sensor "A" Circuit Low Input (Bank 2)

DTC

P0348

Camshaft Position Sensor "A" Circuit High Input (Bank 2)

DESCRIPTION

The intake camshaft's Variable Valve Timing (VVT) sensor (VV1, 2 signal) consists of a magnet and MRE (Magnetic Resistance Element).

The VVT camshaft drive gear has a sensor plate with 3 teeth on its outer circumference. When the gear rotates, changes occur in the air gaps between the sensor plate and MRE, which affects the magnetic field. As a result, the resistance of the MRE material fluctuates. The VVT sensor converts the gear rotation data into pulse signals, uses the pulse signals to determine the camshaft angle, and sends it to the ECM.

The crankshaft angle sensor plate has 34 teeth. The pickup coil generates 34 signals for each engine revolution. Based on a combination of the VVT signal and NE signal, the ECM detects the crankshaft angle. Then the ECM uses this data to control fuel injection time and injection timing. Also, based on the NE signal, the ECM detects the engine speed.

DTC No.

DTC Detection Condition

Trouble Area

P0340

P0345

When either condition below is met:

  • Input voltage to ECM remains at less than 0.3 V, or more than 4.7 V for 4 seconds when 2 or more seconds have elapsed after turning ignition switch to ON

    (1 trip detection logic)

  • No VVT sensor signal to ECM during cranking

    (2 trip detection logic)
  • Open or short in VVT sensor circuit for intake camshaft
  • VVT sensor for intake camshaft
  • Camshaft timing gear for intake camshaft
  • Jumped tooth of timing chain for intake camshaft
  • ECM

P0342

P0347

Output voltage of VVT sensor less than 0.3 V for 4 seconds

(1 trip detection logic)
  • Open or short in VVT sensor circuit for intake camshaft
  • VVT sensor for intake camshaft
  • Camshaft timing gear for intake camshaft
  • Jumped tooth of timing chain for intake camshaft
  • ECM

P0343

P0348

Output voltage of VVT sensor more than 4.7 V for 4 seconds

(1 trip detection logic)
  • Open or short in VVT sensor for intake camshaft circuit
  • VVT sensor for intake camshaft
  • Camshaft timing gear for intake camshaft
  • Jumped tooth of timing chain for intake camshaft
  • 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

D56-92 (VV1+) - D56-91 (VV1-)

5 V/DIV.

20 msec./DIV.

Cranking or idling

The correct waveform is as shown

D56-87 (VV2+) - D56-88 (VV2-)

5 V/DIV.

20 msec./DIV.

Cranking or idling

The correct waveform is as shown

HINT:

VV1+ and VV2+ stand for the VVT sensor signal, and NE+ stands for the CKP sensor signal.

MONITOR DESCRIPTION

If no signal is transmitted by the VVT sensor despite the engine revolving, or the rotations of the camshaft and the crankshaft are not synchronized, the ECM interprets this as a malfunction of the sensor.

MONITOR STRATEGY

Related DTCs

P0340: VVT sensor (for Bank 1) open/short

P0340: VVT position/Crankshaft position misalignment (for Bank 1)

P0342: VVT position sensor (for Bank 1) range check (low voltage)

P0343: VVT position sensor (for Bank 1) range check (high voltage)

P0345: VVT sensor (for Bank 2) open/short

P0345: VVT position/Crankshaft position misalignment (for Bank 2)

P0347: VVT position sensor (for Bank 2) range check (low voltage)

P0348: VVT position sensor (for Bank 2) range check (high voltage)

Required Sensors/Components (Main)

VVT position sensor (for Bank 1 and 2)

Required Sensors/Components (Sub)

Crankshaft position sensor

Frequency of Operation

Continuous

Duration

5 seconds

MIL Operation

2 driving cycles: P0340 (cranking), P0345 (cranking)

Immediate: Others

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

All

Monitor runs whenever following DTCs are not present

None

P0340, P0345 (Engine Running)

Engine speed

600 rpm or more

Battery voltage

8 V or more

Starter

OFF

Ignition switch

ON

P0340, P0345 (Cranking)

Starter

ON

Minimum battery voltage

Less than 11 V

P0340, P0342, P0343, P0345, P0347, P0348 (Chattering, Low Voltage, High Voltage)

Starter

OFF

Ignition switch

ON

Time after ignition switch off to ON

2 seconds or more

Battery Voltage

8 V or more

TYPICAL MALFUNCTION THRESHOLDS

P0340 (Engine Running, Cranking)

VVT sensor signal

No signal

P0340 (Chattering)

VVT sensor voltage

Less than 0.3 V, or more than 4.7 V

P0342 (Low Voltage)

VVT sensor voltage

Less than 0.3 V

P0343 (High Voltage)

VVT sensor voltage

More than 4.7 V

P0345 (Engine Running, Cranking)

VVT sensor signal

No signal

P0345 (Chattering)

VVT sensor voltage

Less than 0.3 V, or more than 4.7 V

P0347 (Low Voltage)

VVT sensor voltage

Less than 0.3 V

P0348 (High Voltage)

VVT sensor voltage

More than 4.7 V

COMPONENT OPERATING RANGE

VVT sensor voltage

0.3 to 4.7 V

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction 3UR-FE ENGINE CONTROL: SFI SYSTEM: DTC CHECK / CLEAR (2008 Sequoia) .

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (SENSOR POWER SOURCE)


(a) Disconnect the VVT sensor connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

3 (VC) - Body ground

Ignition switch ON

4.5 to 5.0 V
OK

2.

CHECK HARNESS AND CONNECTOR (VVT SENSOR FOR INTAKE CAMSHAFT - ECM)

(a) Disconnect the VVT 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

D22-1 (VVL+) - D56-92 (VV1+)

Always

Below 1 Ω

D22-2 (VVL-) - D56-91 (VV1-)

Always

Below 1 Ω

D23-1 (VVR+) - D56-87 (VV2+)

Always

Below 1 Ω

D23-2 (VVR-) - D56-88 (VV2-)

Always

Below 1 Ω

D22-1 (VVL+) or D56-92 (VV1+) - Body ground

Always

10 kΩ or higher

D22-2 (VVL-) or D56-91 (VV1-) - Body ground

Always

10 kΩ or higher

D23-1 (VVR+) or D56-87 (VV2+) - Body ground

Always

10 kΩ or higher

D23-2 (VVR-) or D56-88 (VV2-) - Body ground

Always

10 kΩ or higher
OK

3.

CHECK SENSOR INSTALLATION (VVT SENSOR FOR INTAKE CAMSHAFT)

(a) Check the CKP sensor installation.

OK:

Sensor is installed correctly.
OK

4.

INSPECT INTAKE CAMSHAFT (TEETH)

(a) Check the teeth of the camshaft.

OK:

Teeth do not have any cracks or deformation.

OK

5.

REPLACE VVT SENSOR

(a) Replace the VVT sensor 3UR-FE ENGINE CONTROL: CAMSHAFT POSITION SENSOR: REMOVAL (2008 Sequoia) .

NEXT

6.

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.

(e) Start the engine.

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

(g) Read DTCs.

Result

Result

Proceed to

No DTC is output

A

P0340, P0342, P0343, P0345, P0347 or P0348 are output

B

HINT:

If the engine does not start, replace the ECM.

A