-
No VVT sensor signal to ECM during cranking
(2 trip detection logic)
-
No VVT sensor signal to ECM with engine speed 600 rpm or more
(1 trip detection logic)
| Last Modified: 11-29-2007 | 1.6 C | |
| Service Category: Engine/Hybrid System | Section: Engine Control | |
| Model Year: 2008 | Model: Sequoia | Doc ID: RM000000WBZ042X |
| Title: 2UZ-FE ENGINE CONTROL: SFI SYSTEM: DESCRIPTION (2008 Sequoia) | ||
|
DTC |
P0340 |
Camshaft Position Sensor Circuit Malfunction |
|
DTC |
P0345 |
Camshaft Position Sensor "A" Circuit (Bank 2) |
DESCRIPTION
The Variable Valve Timing (VVT) sensor consists of a magnet, iron core and pickup coil. The VVT signal plate has 3 teeth on its outer circumference and is installed on the camshaft timing pulley. When the camshafts rotates, changes occur on the camshaft protrusions and the pickup coil air gaps. These changes cause fluctuations in the magnetic field and generate voltage in the pickup coil.
Each sensor monitors its timing rotor, which is located on the camshaft. The ECM uses the sensor to detect the camshaft angle. The camshaft rotation synchronizes with the crankshaft rotation, and this sensor communicates the rotation of the camshaft timing rotor as a pulse signal to the ECM. Based on the signal, the ECM controls camshaft position.
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: |
|
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.
|
Item |
Content |
|---|---|
|
Terminal |
NE+ - NE- VV1+ - VV1- VV2+ - VV2- |
|
Equipment Setting |
2 V/DIV. 20 msec./DIV. |
|
Condition |
Cranking or idling |
MONITOR DESCRIPTION
If no signal is transmitted by the VVT sensor despite the engine revolving, 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) P0345: VVT sensor (for bank 2) open/short P0345: VVT position/Crankshaft position misalignment (for bank 2) |
|
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 (case 1) 4 seconds (case 2) |
|
MIL Operation |
Immediate (case 1) 2 driving cycles (case 2) |
|
Sequence of Operation |
None |
TYPICAL ENABLING CONDITIONS
All
|
Monitor runs whenever following DTCs are not present |
None |
Case 1
|
Engine speed |
600 rpm or more |
|
Battery voltage |
8 V or more |
|
Starter |
OFF |
|
Ignition switch |
ON |
Case 2
|
Starter |
ON |
|
Minimum battery voltage |
Less than 11 V |
TYPICAL MALFUNCTION THRESHOLDS
|
VVT sensor signal |
No signal |
COMPONENT OPERATING RANGE
|
VVT sensor voltage |
|
WIRING DIAGRAM
Refer to DTC P0335
.
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
.
PROCEDURE
|
1. |
INSPECT VVT SENSOR (RESISTANCE) |
|
(a) Disconnect the VVT 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 |
835 to 1400 Ω |
|
1 - 2 |
Hot |
1060 to 1645 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).
|
|
2. |
CHECK HARNESS AND CONNECTOR (VVT SENSOR - 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 |
|---|---|---|
|
D68-1 - D56-92 (VV1+) |
Always |
Below 1 Ω |
|
D68-2 - D56-91 (VV1-) |
Always |
Below 1 Ω |
|
D69-1 - D56-87 (VV2+) |
Always |
Below 1 Ω |
|
D69-2 - D56-88 (VV2-) |
Always |
Below 1 Ω |
|
D68-1 or D56-92 (VV1+) - Body ground |
Always |
10 kΩ or higher |
|
D68-2 or D56-91 (VV1-) - Body ground |
Always |
10 kΩ or higher |
|
D69-1 or D56-87 (VV2+) - Body ground |
Always |
10 kΩ or higher |
|
D69-2 or D56-88 (VV2-) - Body ground |
Always |
10 kΩ or higher |
|
|
3. |
CHECK SENSOR INSTALLATION (VVT SENSOR) |
|
(a) Check the VVT sensor installation. OK: Sensor is installed correctly. |
|
|
4. |
INSPECT CAMSHAFT (TEETH) |
(a) Remove the cylinder head cover
.
(b) Check the teeth of the camshaft.
OK:
The camshaft does not have any cracks or deformation.
|
|
5. |
REPLACE VVT SENSOR |
(a) Replace the VVT sensor
.
|
|
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 / Trouble Codes / Pending.
(g) Read DTCs.
Result
|
Result |
Proceed to |
|---|---|
|
No DTC is output |
A |
|
P0340 or P0345 is output |
B |
HINT:
If the engine does not start, replace the ECM.
|
|
|