P1340, P1342, P1343

DTC Code	DTC Name
P1340	Camshaft Position Sensor "A" (Bank 1 Sensor 2)
P1342	Camshaft Position Sensor "A" Low Input (MRE)
P1343	Camshaft Position Sensor "A" High Input (MRE)

DESCRIPTION

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

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

The crankshaft angle sensor rotor has 34 teeth and is mounted on the crankshaft. The crankshaft position sensor generates 34 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 No.	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 gear assembly (LH) ECM
P1340	No camshaft position sensor signal is sent to the ECM with the engine speed at 600 rpm or more, or the camshaft position and crankshaft position phases are misaligned (1 trip detection logic).
P1342	Output voltage of the camshaft position sensor is below 0.3 V for 4 seconds (1 trip detection logic).
P1343	Output voltage of the camshaft position sensor is higher than 4.7 V for 4 seconds (1 trip detection logic).


*a	NE and G2 Signal Waveforms
*b	5 V/DIV.
*c	20 msec./DIV.

Reference: Inspection using an oscilloscope.

Standard

for RHD
Tester Connection	Tool Setting	Condition	Specified Condition
C46-110 (NE+) - C46-111 (NE-)	5 V/DIV., 20 msec./DIV.	Cranking or idling	The correct waveform is as shown
C46-90 (G2) - C46-89 (G2-)	5 V/DIV., 20 msec./DIV.	Cranking or idling	The correct waveform is as shown

for LHD
Tester Connection	Tool Setting	Condition	Specified Condition
C45-110 (NE+) - C45-111 (NE-)	5 V/DIV., 20 msec./DIV.	Cranking or idling	The correct waveform is as shown
C45-90 (G2) - C45-89 (G2-)	5 V/DIV., 20 msec./DIV.	Cranking or idling	The correct waveform is as shown

Tech Tips

G2 is the camshaft position sensor signal, and NE is the crankshaft position sensor signal.

MONITOR DESCRIPTION

If no signal is transmitted by the camshaft position sensor despite the engine running, or the rotations of the camshaft and crankshaft are not synchronized, the ECM interprets this as a malfunction of the sensor.

Also, when the sensor output voltage remains below 0.3 V, or higher than 4.7 V for more than 4 seconds, the ECM stores a DTC.

CONFIRMATION DRIVING PATTERN

Start the engine and run it at idle for 10 seconds or more.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

Tech Tips

Read freeze frame data using the GTS. Freeze frame data records the engine conditions when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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

INSPECT CAMSHAFT POSITION SENSOR (SENSOR POWER SOURCE)

Text in Illustration
*a	Front view of wire harness connector (to Camshaft Position Sensor)

Disconnect the camshaft position sensor connector.
Turn the engine switch on (IG).

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

CHECK HARNESS AND CONNECTOR (ECM - CAMSHAFT POSITION SENSOR)

Disconnect the camshaft position sensor connector.
Disconnect the ECM connector.

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

Standard Resistance

for RHD
Tester Connection	Condition	Specified Condition
C99-1 (G2) - C46-90 (G2)	Always	Below 1 Ω
C99-2 (G-) - C46-89 (G2-)	Always	Below 1 Ω
C99-1 (G2) or C46-90 (G2) - Body ground	Always	10 kΩ or higher
C99-2 (G-) or C46-89 (G2-) - Body ground	Always	10 kΩ or higher

for LHD
Tester Connection	Condition	Specified Condition
C99-1 (G2) - C45-90 (G2)	Always	Below 1 Ω
C99-2 (G-) - C45-89 (G2-)	Always	Below 1 Ω
C99-1 (G2) or C45-90 (G2) - Body ground	Always	10 kΩ or higher
C99-2 (G-) or C45-89 (G2-) - Body ground	Always	10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

CHECK SENSOR INSTALLATION
*1 Clearance
1. Check the camshaft position sensor installation.
  
  OK
  
  The camshaft position sensor is installed properly.
NG
SECURELY REINSTALL SENSOR Click here

OK
INSPECT CAMSHAFT TIMING GEAR ASSEMBLY (SENSOR PLATE TOOTH)
1. Check the teeth of the sensor plate.
  
  OK
  
  Sensor plate teeth do not have any cracks or deformation.
NG
REPLACE CAMSHAFT TIMING GEAR ASSEMBLY Click here

OK
REPLACE CAMSHAFT POSITION SENSOR
1. Replace the camshaft position sensor Click here.
NEXT

*1	Clearance

OK
The camshaft position sensor is installed properly.

OK
Sensor plate teeth do not have any cracks or deformation.

CHECK WHETHER DTC OUTPUT RECURS

Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Clear DTCs Click here.
Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Read DTCs.

Result
Result	Proceed to
No DTC is output	A
P1340, P1342 and/or P1343 is output	B

Tech Tips

If the engine does not start, replace the ECM.

A

END

B

REPLACE ECM Click here

SFI SYSTEM, Diagnostic DTC:P1340, P1342, P1343