- No Crankshaft Position (CKP) sensor signal is sent to the ECM while cranking (1 trip detection logic).
- No CKP sensor signal is sent to the ECM at an engine speed of 600 rpm or more (1 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: RM000000TCW074X |
| Title: 3UR-FE ENGINE CONTROL: SFI SYSTEM: DESCRIPTION (2008 LX570) | ||
|
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 crankshaft position sensor plate and Magnetic Resistance Element (MRE) type sensor. The crankshaft position 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 crankshaft position sensor outputs 34 rotation signals per crankshaft revolution. The ECM uses the G2 signal to distinguish between the cylinders, and uses the NE signal to detect the crankshaft position and engine speed.
|
DTC Code |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
P0335 |
|
|
|
P0337 |
The output voltage of the CKP sensor is 0.3 V or less for 4 seconds (1 trip detection logic). |
|
|
P0338 |
The output voltage of the CKP sensor is 4.7 V or higher for 4 seconds (1 trip detection logic). |
|
|
P0339 |
Under conditions (a), (b) and (c), no CKP sensor signal is sent to the ECM for 0.05 seconds or more (1 trip detection logic): (a) The engine speed is 1,000 rpm or more. (b) The starter signal is OFF. (c) 3 seconds or more have elapsed since the starter signal was switched from ON to OFF. |
|
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 |
|
C53-90 (G2) - C53-89 (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 below 0.3 V, or higher than 4.7 V for more than 4 seconds, the ECM stores DTC(s).
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 stored |
None |
P0335: Crankshaft Position Sensor Range Check:
CASE 1:
|
Engine speed |
600 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 |
Below 11 V |
|
CKP sensor voltage |
0.3 to 4.7 V |
P0337, P0038 Crankshaft Position Sensor Range Check (Low voltage, High voltage):
|
Battery voltage |
8 V or higher |
|
Engine switch |
On (IG) |
|
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 |
Below 0.3 V |
P0338 Crankshaft Position Sensor Range Check (High voltage):
|
CKP sensor voltage |
Higher than 4.7 V |
COMPONENT OPERATING RANGE
|
CKP sensor |
|
|
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:
- Connect the Techstream to the DLC3.
- Start the engine.
- Turn the Techstream on.
- 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 engine switch on (IG) and turn the Techstream on.
(c) Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Engine Speed.
(d) Start the engine.
(e) 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.
|
|
2. |
INSPECT CRANKSHAFT POSITION SENSOR (SENSOR POWER SOURCE) |
(a) Disconnect the C1 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 |
|---|---|---|
|
C1-3 - Body ground |
Engine switch on (IG) |
4.5 to 5.0 V |
|
|
3. |
CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM) |
(a) Disconnect the C1 crankshaft position 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 |
|---|---|---|
|
C1-1 (NE+) - C53-110 (NE+) |
Always |
Below 1 Ω |
|
C1-2 (NE-) - C53-111 (NE-) |
Always |
Below 1 Ω |
|
C1-1 (NE+) or C53-110 (NE+) - Body ground |
Always |
10 kΩ or higher |
|
C1-2 (NE-) or C53-111 (NE-) - Body ground |
Always |
10 kΩ or higher |
|
|
4. |
CHECK SENSOR INSTALLATION (CRANKSHAFT POSITION SENSOR) |
(a) Check the crankshaft position sensor installation.
OK:
Sensor is installed correctly.
|
|
5. |
CHECK 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.
|
|
6. |
REPLACE CRANKSHAFT POSITION SENSOR |
(a) Replace the crankshaft position sensor
.
|
|
7. |
CHECK WHETHER DTC OUTPUT RECURS (DTC P0335, P0337, P0338 AND/OR P0339) |
(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 |
|
P0335, P0337, P0338 and/or P0339 |
B |
HINT:
If the engine does not start, replace the ECM.
|
|
8. |
CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM) |
(a) Disconnect the C1 crankshaft position 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 |
|---|---|---|
|
C1-3 (VC) - C53-66 (VCV2) |
Always |
Below 1 Ω |
|
C1-3 (VC) or C53-66 (VCV2) - Body ground |
Always |
10 kΩ or higher |
|
|
|