3UR-FE ENGINE CONTROL: SFI SYSTEM: DESCRIPTION (2008 LX570)

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Last Modified: 11-27-2007		1.6 C
Service Category: Engine/Hybrid System	Section: Engine Control
Model Year: 2008	Model: LX570	Doc ID: RM000000TMH01GX
Title: 3UR-FE ENGINE CONTROL: SFI SYSTEM: DESCRIPTION (2008 LX570)

DTC

P1340

Camshaft Position Sensor "A" (Bank 1 Sensor 2)

DTC

P1342

Camshaft Position Sensor "A" Low Input (MRE)

DTC

P1343

Camshaft Position Sensor "A" High Input (MRE)

DESCRIPTION

The camshaft position sensor (G signal) consists of a magnet and MRE (Magnetic Resistance Element).

The camshaft drive gear (LH) has 3 teeth on its inner circumstance. When the camshaft gear rotates, air gap changes between the protrusion on the teeth and the MRE. The change affects the magnetic field and results in changes in the resistance of the MRE.

The crankshaft position sensor plate has 34 teeth and is installed to the rear end of the crankshaft. The crankshaft position sensor generates 34 signals with every crankshaft revolution. The ECM detects the standard crankshaft angle based on the G signal, and the actual crankshaft angle and engine speed by the NE signal.

DTC Code	DTC Detection Condition	Trouble Area
P1340	No camshaft position sensor signal is sent to the ECM during cranking (2 trip detection logic).	Open or short in camshaft position sensor circuit Camshaft position sensor Camshaft timing plate LH ECM
P1340	No camshaft position sensor signal is sent to the ECM with an engine speed of 600 rpm or more.
P1342	The output voltage of the camshaft position sensor is below 0.3 V for 4 seconds (1 trip detection logic).
P1343	The output voltage of the camshaft position sensor is higher than 4.7 V for 4 seconds (1 trip detection logic).

MONITOR DESCRIPTION

The camshaft position sensor (G signal) consists of a magnet and MRE.

The camshaft drive gear has 3 teeth on its inner circumference. When the camshaft gear rotates, air gap changes between the protrusion on the gear and the MRE. The change affects the magnetic field and results in changes in the resistance of the MRE. The crankshaft position sensor plate has 34 teeth and outputs 34 signals with every crankshaft revolution. The ECM detects the standard crankshaft angle based on the G signal, and the actual crankshaft angle and engine speed by the NE signal.

MONITOR STRATEGY

Related DTCs	P1340: Camshaft position sensor range check P1340: Camshaft position / Crankshaft position misalignment P1342: Camshaft position sensor range check (low voltage) P1343: Camshaft position sensor range check (high voltage)
Required Sensors/Components (Main)	Camshaft position sensor
Required Sensors/Components (Related)	Crankshaft position sensor, Engine speed sensor
Frequency of Operation	Continuous
Duration	5 seconds
MIL Operation	2 driving cycles: P1340 camshaft position sensor range check Immediate: P1340 camshaft position / crankshaft position misalignment and P1342, P1343 camshaft position sensor range check
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever these DTCs are not stored

P1340 camshaft position sensor range check:

Starter	ON
Minimal battery voltage while starter ON	Below 11 V

P1340 camshaft position / crankshaft position misalignment:

Engine speed	600 rpm or more
Starter	OFF
Camshaft position sensor range	0.3 to 4.7 V

P1342, P1343 camshaft position sensor range check:

Time after engine switch off to on (IG)	2 seconds or more
Battery voltage	8 V or higher
Starter	OFF

TYPICAL MALFUNCTION THRESHOLDS

P1340 camshaft position sensor range check:

Camshaft position signal

No signal

P1340 camshaft position / crankshaft position misalignment:

Camshaft position and crankshaft position phase

Misaligned

P1342 camshaft position sensor range check:

Camshaft position sensor voltage

Below 0.3 V

P1343 camshaft position sensor range check:

Camshaft position sensor voltage

Higher than 4.7 V

COMPONENT OPERATING RANGE

Camshaft position sensor signal

Camshaft position sensor voltage fluctuates when the camshaft rotates
3 signals per revolution of crankshaft

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

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.	INSPECT CAMSHAFT POSITION SENSOR (SENSOR POWER SOURCE)

(a) Disconnect the C2 camshaft position sensor connector.

(b) Turn the engine switch on (IG).

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
C2-3 (VC) - Body ground	Engine switch on (IG)	4.5 to 5.0 V

2.	CHECK HARNESS AND CONNECTOR (ECM - CAMSHAFT POSITION SENSOR)

(a) Disconnect the C2 camshaft position sensor connector.

(b) Disconnect the C53 ECM connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
C2-1 (G2) - C53-90 (G2)	Always	Below 1 Ω
C2-2 (G-) - C53-89 (G2-)	Always	Below 1 Ω
C2-1 (G2) or C53-90 (G2) - Body ground	Always	10 kΩ or higher
C2-2 (G-) or C53-89 (G2-) - Body ground	Always	10 kΩ or higher

3.	INSPECT SENSOR INSTALLATION (CAMSHAFT POSITION SENSOR)

(a) Check the camshaft position sensor installation.

OK:

The camshaft position sensor is installed properly.

4.	INSPECT CAMSHAFT TIMING PLATE (SIGNAL PLATE TOOTH)

(a) Check the teeth of the signal plate.

OK:

Sensor plate teeth do not have any cracks or deformation.

5.	REPLACE CAMSHAFT POSITION SENSOR

(a) Replace the camshaft position sensor .

6.	CONFIRM WHETHER DTC OUTPUT RECURS

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(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 DTC is output	A
P1340, P1342 and/or P1343 are output	B

HINT:

If the engine does not start, replace the ECM.