Diagnostic trouble code P1340 P1342 P1343 3UR-FE Land Cruiser

DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT CAMSHAFT POSITION SENSOR (SENSOR POWER SOURCE)

CHECK HARNESS AND CONNECTOR (ECM - CAMSHAFT POSITION SENSOR)

INSPECT SENSOR INSTALLATION

INSPECT CAMSHAFT TIMING PLATE (SIGNAL PLATE TOOTH)

REPLACE CAMSHAFT POSITION SENSOR

CONFIRM WHETHER DTC OUTPUT RECURS

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 circumference. 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 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
	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 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.

Wiring diagram

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.

1.INSPECT CAMSHAFT POSITION SENSOR (SENSOR POWER SOURCE)

1. Disconnect the C99 camshaft position sensor connector.

2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage:

   Tester Connection	Switch Condition	Specified Condition
   C99-3 (VC) - Body ground	Engine switch on (IG)	4.5 to 5.0 V

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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

1. Disconnect the C99 camshaft position sensor connector.

2. Disconnect the C45 ECM connector.

3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   C99-1 (G2) - C45-90 (G2)	Always	Below 1 ?
   C99-2 (G-) - C45-89 (G2-)	Always	Below 1 ?
   C99-1 (G2) or C45-90 (G2) - Body ground	Always	10 k? or higher
   C99-2 (G-) or C45-89 (G2-) - Body ground	Always	10 k? or higher

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.INSPECT SENSOR INSTALLATION

1. Check the camshaft position sensor installation.

   OK:

   The camshaft position sensor is installed properly.

NG	SECURELY REINSTALL SENSOR

OK

4.INSPECT CAMSHAFT TIMING PLATE (SIGNAL PLATE TOOTH)

1. Check the teeth of the signal plate.

   OK:

   Sensor plate teeth do not have any cracks or deformation.

NG	REPLACE CAMSHAFT TIMING PLATE

OK

5.REPLACE CAMSHAFT POSITION SENSOR

1. Replace the camshaft position sensor .

NEXT

6.CONFIRM WHETHER DTC OUTPUT RECURS

1. Connect the intelligent tester to the DLC3.

2. Turn the engine switch on (IG).

3. Turn the tester on.

4. Clear DTCs .

5. Start the engine.

6. Enter the following menus: Powertrain / Engine and ECT / DTC.

7. 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.

B	REPLACE ECM

A
END