SFI SYSTEM, Diagnostic DTC:P0340, P0342, P0343

DTC Code	DTC Name
P0340	Camshaft Position Sensor Circuit Malfunction
P0342	Camshaft Position Sensor "A" Circuit Low Input (Bank 1 or Single Sensor)
P0343	Camshaft Position Sensor "A" Circuit High Input (Bank 1 or Single Sensor)

DESCRIPTION

The camshaft position sensor for the intake camshaft (VV1 signal) consists of a magnet and MRE (Magneto Resistance Element).

The camshaft has a timing rotor for the camshaft position sensor. When the camshaft rotates, changes occur in the air gaps between the timing rotor and MRE, which affects the magnetic field. As a result, the resistance of the MRE material fluctuates. The camshaft position sensor converts the camshaft rotation data to pulse signals, uses the pulse signals to determine the camshaft angle, and sends it to the ECM. Then the ECM uses this data to control fuel injection and injection timing.

DTC No.	DTC Detection Condition	Trouble Area
P0340	When one of the following conditions is met: No camshaft position sensor signal to the ECM while cranking (2 trip detection logic). No camshaft position sensor signal to the ECM at an engine speed of 600 rpm or higher (1 trip detection logic). A missing camshaft position sensor signal despite the crankshaft position sensor inputs being normal at an engine speed of 600 rpm or higher (1 trip detection logic).	Open or short in camshaft position sensor circuit (for intake camshaft) Camshaft position sensor (for intake camshaft) Intake camshaft Valve timing ECM
P0342	The output voltage of the camshaft position sensor is below 0.3 V for 4 seconds (1 trip detection logic).	Open or short in camshaft position sensor circuit (for intake camshaft) Camshaft position sensor (for intake camshaft) ECM
P0343	The output voltage is higher than 4.7 V for 4 seconds (1 trip detection logic).	Open or short in camshaft position sensor circuit (for intake camshaft) Camshaft position sensor (for intake camshaft) ECM

DTC No.

DTC Detection Condition

Trouble Area

P0340

When one of the following conditions is met:

No camshaft position sensor signal to the ECM while cranking (2 trip detection logic).
No camshaft position sensor signal to the ECM at an engine speed of 600 rpm or higher (1 trip detection logic).
A missing camshaft position sensor signal despite the crankshaft position sensor inputs being normal at an engine speed of 600 rpm or higher (1 trip detection logic).

Open or short in camshaft position sensor circuit (for intake camshaft)
Camshaft position sensor (for intake camshaft)
Intake camshaft
Valve timing
ECM

P0342

The output voltage of the camshaft position sensor is below 0.3 V for 4 seconds (1 trip detection logic).

Open or short in camshaft position sensor circuit (for intake camshaft)
Camshaft position sensor (for intake camshaft)
ECM

P0343

The output voltage is higher than 4.7 V for 4 seconds (1 trip detection logic).

Open or short in camshaft position sensor circuit (for intake camshaft)
Camshaft position sensor (for intake camshaft)
ECM

Reference: Inspection using an oscilloscope.

Tech Tips

The correct waveform is as shown.
VV1 stands for the camshaft position sensor signal (for intake camshaft), and EV1 stands for the camshaft position sensor signal (for exhaust camshaft).

ECM Terminal Name

CH1: Between VV1+ and VV1-

CH2: Between EV1+ and EV1-

Tester Range

5 V/DIV., 20 ms./DIV.

Condition

Idling

MONITOR DESCRIPTION

If no pulse signal is transmitted by the camshaft position sensor despite the camshaft rotating, or the rotation of the camshaft and the crankshaft is not synchronized, the ECM interprets this as a malfunction of the sensor.

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

MONITOR STRATEGY

Required Sensors/Components (Main)	Camshaft position sensor
Required Sensors/Components (Related)	Crankshaft position sensor
Frequency of Operation	Continuous

CONFIRMATION DRIVING PATTERN

Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON and turn the tester on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch to ON and turn the tester on.
Start the engine.
Idle the engine for 10 seconds or more.
Enter the following menus: Powertrain / Engine and ECT / DTC.
Read the pending DTCs.
Tech Tips
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
Input the DTC: P0340, P0342 or P0343.

Check the DTC judgment result.

Tester Display	Description
NORMAL	DTC judgment completed System normal
ABNORMAL	DTC judgment completed System abnormal
INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
N/A	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

Tech Tips

If the judgment result shows NORMAL, the system is normal.
If the judgment result shows ABNORMAL, the system has a malfunction.
If the judgment result shows INCOMPLETE or N/A, perform the Confirmation Driving Pattern and check the DTC judgment result again.

WIRING DIAGRAM

INSPECTION PROCEDURE

Tech Tips

If no problem is found through this diagnostic troubleshooting procedure, there may be a mechanical problem with the engine.
Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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

CHECK TERMINAL VOLTAGE (POWER SOURCE OF CAMSHAFT POSITION SENSOR)

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

Disconnect the camshaft position sensor for intake camshaft connector.

Turn the ignition switch to ON.

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

Standard Voltage

Tester Connection	Switch Condition	Specified Condition
E55-3 (VC) - Body ground	Ignition switch ON	4.5 to 5.5 V

CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM) Click here

CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM)

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

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

Standard Resistance

Tester Connection	Condition	Specified Condition
E55-1 (VVI+) - E26-82 (VV1+)	Always	Below 1 Ω
E55-2 (VVI-) - E26-114 (VV1-)	Always	Below 1 Ω
E55-1 (VVI+) or E26-82 (VV1+) - Body ground	Always	10 kΩ or higher
E55-2 (VVI-) or E26-114 (VV1-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK SENSOR INSTALLATION (CAMSHAFT POSITION SENSOR FOR INTAKE CAMSHAFT)
1. Check the camshaft position sensor for intake camshaft installation.
  
  OK
  
  Camshaft position sensor is installed correctly.
NG
SECURELY REINSTALL CAMSHAFT POSITION SENSOR Click here

OK
INSPECT INTAKE CAMSHAFT (TIMING ROTOR)
1. Check the timing rotor of the intake camshaft.
  
  OK
  
  Camshaft timing rotor does not have any cracks or deformation.
  
  Tech Tips
  
  Perform "Inspection After Repair" after replacing the intake camshaft Click here.
NG
REPLACE INTAKE CAMSHAFT Click here

OK

OK
Camshaft position sensor is installed correctly.

OK
Camshaft timing rotor does not have any cracks or deformation.

CHECK VALVE TIMING (CHECK FOR LOOSE TIMING CHAIN AND JUMPED TEETH)

Text in Illustration
*1	Timing Mark	-	-

Remove the cylinder head cover sub-assembly.
Turn the crankshaft pulley and align its groove with the "0" timing mark of the timing chain cover.

Check that the timing marks of the camshaft timing gear assembly and camshaft timing exhaust gear assembly are at the positions shown in the illustration.

Tech Tips

If the timing marks are not as shown, turn the crankshaft one revolution clockwise.

OK
Timing marks on camshaft timing gear assembly and camshaft timing exhaust gear assembly are aligned as shown in the illustration.

ADJUST VALVE TIMING Click here

REPLACE CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT)
1. Replace the camshaft position sensor (for intake camshaft) Click here.
NEXT

CHECK WHETHER DTC OUTPUT RECURS (DTC P0340, P0342 OR P0343)

Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON.
Turn the tester on.
Clear the DTCs Click here.
Turn the ignition switch off and wait for at least 30 seconds.
Start the engine.
Turn the tester on.
Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
Enter the following menus: Powertrain / Engine and ECT / DTC.

Read the DTCs.

Result
Result	Proceed to
DTC P0340, P0342 or P0343 is output	A
DTC is not output	B

Tech Tips

If the engine does not start, replace the ECM.

END

REPLACE ECM Click here

CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM)

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

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

Standard Resistance

Tester Connection	Condition	Specified Condition
E55-3 (VC) - E26-113 (VCV1)	Always	Below 1 Ω
E55-3 (VC) or E26-113 (VCV1) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE ECM Click here