P0340, P0341

DTC Code	DTC Name
P0340	Camshaft Position Sensor Circuit
P0341	Camshaft Position Sensor "A" Circuit Range / Performance (Bank 1 or Single Sensor)

DESCRIPTION

The camshaft position sensor consists of a magnet and an iron core which is wrapped with copper wire, and is installed on the cylinder head. When the camshaft rotates, each of the 3 teeth on the camshaft pass through the camshaft position sensor. This activates the internal magnet in the sensor, generating a voltage in the copper wire. The camshaft rotation is synchronized with the crankshaft rotation. When the crankshaft turns twice, the voltage is generated 3 times in the camshaft position sensor. The generated voltage in the sensor acts as a signal, allowing the ECM to locate the camshaft position. This signal is then used to control ignition timing, fuel injection timing, and the VVT system.

DTC No.	DTC Detection Condition	Trouble Area
P0340	When one of the following conditions is met: No camshaft position sensor signal is sent to the ECM while cranking (2 trip detection logic). The camshaft position sensor signal is missing despite the crankshaft position sensor input being normal at an engine speed of 600 rpm or more (1 trip detection logic).	Open or short in camshaft position sensor circuit Camshaft position sensor Camshaft timing gear assembly Timing chain for intake camshaft jumped tooth ECM
P0341	When crankshaft rotates twice, The camshaft position sensor signal input to the ECM 12 times or more (1 trip detection logic).	Open or short in camshaft position sensor circuit Camshaft position sensor Camshaft timing gear assembly Timing chain for intake camshaft jumped tooth ECM

DTC No.

DTC Detection Condition

Trouble Area

P0340

When one of the following conditions is met:

No camshaft position sensor signal is sent to the ECM while cranking (2 trip detection logic).
The camshaft position sensor signal is missing despite the crankshaft position sensor input being normal at an engine speed of 600 rpm or more (1 trip detection logic).

Open or short in camshaft position sensor circuit
Camshaft position sensor
Camshaft timing gear assembly
Timing chain for intake camshaft jumped tooth
ECM

P0341

When crankshaft rotates twice, The camshaft position sensor signal input to the ECM 12 times or more (1 trip detection logic).

Open or short in camshaft position sensor circuit
Camshaft position sensor
Camshaft timing gear assembly
Timing chain for intake camshaft jumped tooth
ECM

Tech Tips

Reference: Inspection using an oscilloscope.

G2 stands for the camshaft position sensor signal and NE stands for the crankshaft position sensor signal.
Grounding failure of the shielded wire may cause noise in the waveforms.

Tester Connection	Tool Setting	Condition	Specified Condition
D97-93 (NE+) - D97-117 (NE-)	5 V/DIV, 20 msec./DIV.	Idling	The correct waveform is as shown
D97-94 (G2) - D97-118 (G2-)	5 V/DIV, 20 msec./DIV.	Idling	The correct waveform is as shown

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 circuit.

WIRING DIAGRAM

INSPECTION PROCEDURE

Tech Tips

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 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 (RESISTANCE)
1. Inspect the camshaft position sensor Click here.
NG
REPLACE CAMSHAFT POSITION SENSOR Click here

OK

CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM)

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

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

Standard Resistance

Tester Connection	Condition	Specified Condition
D10-1 - D97-94 (G2)	Always	Below 1 Ω
D10-2 - D97-118 (G2-)	Always	Below 1 Ω
D10-1 or D97-94 (G2) - Body ground	Always	10 kΩ or higher
D10-2 or D97-118 (G2-) - Body ground	Always	10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

CHECK SENSOR INSTALLATION (CAMSHAFT POSITION SENSOR)
1. Check the camshaft position sensor.
  
  OK
  
  Sensor is installed correctly.
NG
SECURELY REINSTALL SENSOR Click here

OK
INSPECT CAMSHAFT TIMING GEAR ASSEMBLY (TEETH)
1. Check the teeth of the camshaft timing gear assembly.
  
  OK
  
  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

OK
Sensor is installed correctly.

OK
Teeth do not have any cracks or deformation.

CHECK WHETHER DTC OUTPUT RECURS

Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON.
Turn the intelligent tester on.
Clear the DTCs.
Turn the ignition switch off and wait for at least 30 seconds.
Start the engine and idle it for 10 seconds or more.
Enter the following menus: Powertrain / Engine and ECT / DTC.

Read the DTCs.

Result
Result	Proceed to
No DTC is output	A
P0340 is output	B

Tech Tips

If the engine does not start, replace the ECM.

B

REPLACE ECM Click here

A

END

SFI SYSTEM (w/ Secondary Air Injection System), Diagnostic DTC:P0340, P0341