Last Modified: 4-30-2014 6.6 C Doc ID: RM000000TMH007X
Model Year: 2006 Model: LX470 Prod Date Range: [05/2005 -           ]
Title: 2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1340,P1341; Camshaft Position Sensor "A" (Bank 1 Sensor 2); 2006 MY LX470 [05/2005 -        ]

DTC

P1340

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

DTC

P1341

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

DESCRIPTION

The camshaft position sensor (G signal) consists of a magnet, iron core and pickup coil.

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 gear and the pickup coil. The change affects the magnetic field and results in changes in the resistance of the MRE element.

The crankshaft signal plate has 34 teeth and is mounted on the crankshaft. The crankshaft position sensor generates 34 signals at every engine revolution. The ECM detects the standard crankshaft angle based on the G signal and the actual crankshaft angle and the engine speed by the NE signal.

DTC No.

DTC Detection Condition

Trouble Area

P1340

P1341

No camshaft position sensor signal to ECM during cranking (2 trip detection logic)
  • Open or short in camshaft position sensor circuit
  • Camshaft position sensor
  • Camshaft timing pulley LH
  • ECM

No camshaft position sensor signal to ECM with engine speed 600 rpm or more

MONITOR DESCRIPTION

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

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 pickup coil. The change affects the magnetic filed and results in changes in the resistance of the MRE element. The crankshaft angle sensor plate has 34 teeth and outputs 34 signals at every engine revolution. The ECM detects the standard crankshaft angle based on the G signal and actual crankshaft angle and engine speed by NE signal.

MONITOR STRATEGY

Related DTCs

P1340: Camshaft position sensor range check

P1340: Camshaft position / Crankshaft position misalignment

P1341: Camshaft position sensor malfunction

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: Camshaft position sensor range check

Immediate: Camshaft position / Crankshaft position misalignment and camshaft position sensor malfunction

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever these DTCs are not present

-

Camshaft position sensor range check:

Starter

ON

Minimal battery voltage while starter ON

Less than 11 V

Camshaft position / Crankshaft position misalignment:

Engine RPM

600 rpm or more

Starter

OFF

Camshaft position sensor malfunction:

Starter

After OFF to ON timing

TYPICAL MALFUNCTION THRESHOLDS

Camshaft position sensor range check:

Camshaft position signal

No signal

Camshaft position / Crankshaft position misalignment:

Camshaft position and crankshaft position phase

Misaligned

Camshaft position sensor malfunction:

Camshaft position and crankshaft position phase

Misaligned

Camshaft position signal per 2 revolutions of crankshaft

12 signals or more

COMPONENT OPERATING RANGE

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

WIRING DIAGRAM

Refer to DTC P0335 2006 MY LX470 [05/2005 -        ]; 2UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0335,P0339; Crankshaft Position Sensor "A" Circuit+ .

INSPECTION PROCEDURE

HINT:

Read freeze frame data using the intelligent tester. 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.

CHECK HARNESS AND CONNECTOR (SENSOR POWER SOURCE)

(a) Disconnect the C39 camshaft position sensor connector.

(b) Turn the ignition switch ON.

(c) Measure the voltage between terminal 3 of the camshaft position sensor connector and body ground.

Standard voltage:

Tester Connection

Specified Condition

C39-3 - Body ground

4.5 to 5.0 V

(d) Reconnect the camshaft position sensor connector.
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2.

CHECK ECM TERMINAL VOLTAGE

(a) Inspect the ECM using an oscilloscope.

(1) While the engine is idling, check the waveform between the terminals of the ECM connector.

Standard voltage:

Tester Connection

Specified Condition

E6-19 (G2+) - E6-29 (G2-)

Correct waveform is as shown

HINT:

  • *1: Crank angle
  • *2: 180°
  • *3: 120°
  • *4: 60°
OK

REPLACE ECM

NG

3.

CHECK HARNESS AND CONNECTOR (ECM - CAMSHAFT POSITION SENSOR)

(a) Check harness and connector 2006 MY LX470 [05/2005 -        ]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: ELECTRONIC CIRCUIT INSPECTION PROCEDURE .

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

INSPECT SENSOR INSTALLATION

(a) Check the camshaft position sensor installation.

OK:

The camshaft position sensor is installed properly.
NG

REPAIR OR REPLACE SENSOR

OK

5.

INSPECT CAMSHAFT TIMING PULLEY LH (SIGNAL PLATE TOOTH)
NG

REPLACE CAMSHAFT TIMING PULLEY LH

OK

REPLACE CAMSHAFT POSITION SENSOR