- The input voltage to the ECM remains at below 0.3 V or higher than 4.7 V for 4 seconds when 2 or more seconds have elapsed after turning the engine switch on (IG) (1 trip detection logic).
- No VVT sensor (for intake side of Bank 1, 2) signal is sent to the ECM during cranking (2 trip detection logic).
| Last Modified: 11-27-2007 | 1.6 C | |
| Service Category: Engine/Hybrid System | Section: Engine Control | |
| Model Year: 2008 | Model: LX570 | Doc ID: RM000000WBZ03YX |
| Title: 3UR-FE ENGINE CONTROL: SFI SYSTEM: DESCRIPTION (2008 LX570) | ||
|
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 Variable Valve Timing (VVT) sensor (VV1, 2 signal) consists of a magnet and MRE (Magnetic Resistance Element).
The intake camshaft has 3 teeth on its outer circumference. When the intake camshaft rotates, changes occur in the air gaps between the teeth and MRE, which affects the magnetic field. As a result, the resistance of the MRE material fluctuates. The VVT sensor converts the intake camshaft rotation data into pulse signals, uses the pulse signals to determine the camshaft angle, and sends it to the ECM.
The crankshaft position sensor plate has 34 teeth. The crankshaft position sensor generates 34 signals for each crankshaft 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 Code |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
P0340 P0345 |
When either condition below is met: |
|
|
P0342 P0347 |
The output voltage of the VVT sensor (for intake side of Bank 1, 2) is below 0.3 V for 4 seconds (1 trip detection logic). |
|
|
P0343 P0348 |
The output voltage of the VVT sensor (for intake side of Bank 1, 2) is higher than 4.7 V for 4 seconds (1 trip detection logic). |
|
Reference: Inspection using an oscilloscope
Standard:
|
Tester Connection |
Tool Setting |
Condition |
Specified Condition |
|---|---|---|---|
|
C53-110 (NE+) - C53-111 (NE-) |
5 V/DIV. 20 msec./DIV. |
Cranking or idling |
The correct waveform is as shown |
|
C53-92 (VV1+) - C53-91 (VV1-) |
5 V/DIV. 20 msec./DIV. |
Cranking or idling |
The correct waveform is as shown |
|
C53-87 (VV2+) - C53-88 (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 (for intake side) 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 (Related) |
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 stored |
None |
P0340, P0345 (Engine running):
|
Engine speed |
600 rpm or more |
|
Battery voltage |
8 V or higher |
|
Starter |
OFF |
|
Engine switch |
On (IG) |
P0340, P0345 (Cranking):
|
Starter |
ON |
|
Minimum battery voltage |
Below 11 V |
P0340, P0342, P0343, P0345, P0347, P0348 (Chattering, Low voltage, High voltage):
|
Starter |
OFF |
|
Engine switch |
On (IG) |
|
Time after engine switch off to on (IG) |
2 seconds or more |
|
Battery Voltage |
8 V or higher |
TYPICAL MALFUNCTION THRESHOLDS
P0340 (Engine running, cranking):
|
VVT sensor signal |
No signal |
P0340 (Chattering):
|
VVT sensor voltage |
Below 0.3 V, or higher than 4.7 V |
P0342 (Low voltage):
|
VVT sensor voltage |
Below 0.3 V |
P0343 (High voltage):
|
VVT sensor voltage |
Higher than 4.7 V |
P0345 (Engine running, cranking):
|
VVT sensor signal |
No signal |
P0345 (Chattering):
|
VVT sensor voltage |
Below 0.3 V, or higher than 4.7 V |
P0347 (Low voltage):
|
VVT sensor voltage |
Below 0.3 V |
P0348 (High voltage):
|
VVT sensor voltage |
Higher 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. 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. |
CHECK HARNESS AND CONNECTOR (SENSOR POWER SOURCE) |
(a) Disconnect the C20 or C21 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 |
Engine switch on (IG) |
4.5 to 5.0 V |
|
|
2. |
CHECK HARNESS AND CONNECTOR (VVT SENSOR FOR INTAKE SIDE - ECM) |
|
(a) Disconnect the C20 or C21 VVT sensor connector. |
(b) Disconnect the C53 ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
C20-1 (VVL+) - C53-92 (VV1+) |
Always |
Below 1 Ω |
|
C20-2 (VVL-) - C53-91 (VV1-) |
Always |
Below 1 Ω |
|
C21-1 (VVR+) - C53-87 (VV2+) |
Always |
Below 1 Ω |
|
C21-2 (VVR-) - C53-88 (VV2-) |
Always |
Below 1 Ω |
|
C20-1 (VVL+) or C53-92 (VV1+) - Body ground |
Always |
10 kΩ or higher |
|
C20-2 (VVL-) or C53-91 (VV1-) - Body ground |
Always |
10 kΩ or higher |
|
C21-1 (VVR+) or C53-87 (VV2+) - Body ground |
Always |
10 kΩ or higher |
|
C21-2 (VVR-) or C53-88 (VV2-) - Body ground |
Always |
10 kΩ or higher |
|
|
3. |
CHECK SENSOR INSTALLATION (VVT SENSOR) |
|
(a) Check the VVT sensor (for intake side) installation. OK: Sensor is installed correctly. |
|
|
4. |
CHECK INTAKE CAMSHAFT (TEETH) |
(a) Check the teeth of the camshaft.
OK:
Teeth do not have any cracks or deformation.
|
|
5. |
REPLACE VVT SENSOR (for Intake Side) |
(a) Replace the VVT sensor (for Intake Side)
.
|
|
6. |
CHECK WHETHER DTC OUTPUT RECURS |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Clear DTCs.
(e) Start the engine.
(f) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
(g) Read DTCs.
Result
|
Result |
Proceed to |
|---|---|
|
No output |
A |
|
P0340, P0342, P0343, P0345, P0347 or P0348 |
B |
HINT:
If the engine does not start, replace the ECM.
|
|
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