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 (G signal sensor) consists of a magnet and an MRE (Magneto Resistive 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 affect 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, and uses the pulse signals to determine the camshaft angle, which it sends to the ECM. Then the ECM uses this data to control fuel injection time and injection timing.

DTC No.	DTC Detection Condition	Trouble Area
P0340	When one of following conditions is met: No camshaft position sensor signal to ECM while cranking (2 trip detection logic) Missing camshaft position sensor signal despite crankshaft position sensor inputs normal at engine speed of 600 rpm or more*1 (1 trip detection logic)	Open or short in camshaft position sensor circuit for intake camshaft Camshaft position sensor for intake camshaft Camshaft timing gear for intake camshaft Jumped tooth of timing chain for intake camshaft ECM
P0342	Output voltage of camshaft position sensor less than 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	Output voltage of camshaft position sensor 4.7 V or more 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 following conditions is met:

No camshaft position sensor signal to ECM while cranking (2 trip detection logic)
Missing camshaft position sensor signal despite crankshaft position sensor inputs normal at engine speed of 600 rpm or more*1 (1 trip detection logic)

Open or short in camshaft position sensor circuit for intake camshaft
Camshaft position sensor for intake camshaft
Camshaft timing gear for intake camshaft
Jumped tooth of timing chain for intake camshaft
ECM

P0342

Output voltage of camshaft position sensor less than 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

Output voltage of camshaft position sensor 4.7 V or more 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

*1: w/ Stop and Start System

When the engine is stopped due to Stop and Start system control, the camshaft position sensor does not monitor, but will resume monitoring when the engine is running.


*a	5 V/DIV.
*b	20 ms./DIV.

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).
Grounding failure of the shielded wire may cause a noisy waveform.

ECM Terminal Name

CH1: Between VV1+ and VV1-

CH2: Between EV1+ and EV1-

Tester Range

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

Condition

Idling with warm engine

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.

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 DTCs (even if no DTCs are stored, perform the clear DTC operation)
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch to ON and turn the tester on.
Idle the engine for 10 seconds or more.
Enter the following menus: Powertrain / Engine and ECT / DTC.
Read 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 the DTC judgment result again.

WIRING DIAGRAM

Refer to DTC P0335 Click here.

CAUTION / NOTICE / HINT

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.
If no problem is found through this diagnostic troubleshooting procedure, troubleshoot the engine mechanical system.

PROCEDURE

CHECK TERMINAL VOLTAGE (POWER SOURCE OF CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT))

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
B32-3 (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

for LHD
Tester Connection	Condition	Specified Condition
B32-1 (VVI+) - B22-82 (VV1+)	Always	Below 1 Ω
B32-2 (VVI-) - B22-114 (VV1-)	Always	Below 1 Ω
B32-1 (VVI+) or B22-82 (VV1+) - Body ground	Always	10 kΩ or higher
B32-2 (VVI-) or B22-114 (VV1-) - Body ground	Always	10 kΩ or higher

for RHD
Tester Connection	Condition	Specified Condition
B32-1 (VVI+) - B23-82 (VV1+)	Always	Below 1 Ω
B32-2 (VVI-) - B23-114 (VV1-)	Always	Below 1 Ω
B32-1 (VVI+) or B23-82 (VV1+) - Body ground	Always	10 kΩ or higher
B32-2 (VVI-) or B23-114 (VV1-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK SENSOR INSTALLATION (CAMSHAFT POSITION SENSOR FOR INTAKE CAMSHAFT)

Text in Illustration
*a	OK
*b	NG
*c	Clearance

Check the camshaft position sensor (for intake camshaft) installation.

OK
Sensor is installed correctly.

SECURELY REINSTALL SENSOR Click here

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 Repairs" after replacing the intake camshaft Click here.
NG
REPLACE INTAKE CAMSHAFT Click here

OK
CHECK VALVE TIMING
1. Check the valve timing Click here.
NG
ADJUST VALVE TIMING Click here

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

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

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 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.

REPLACE ECM Click here

END

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

for LHD
Tester Connection	Condition	Specified Condition
B32-3 (VC) - B22-113 (VCV1)	Always	Below 1 Ω
B32-3 (VC) or B22-113 (VCV1) - Body ground	Always	10 kΩ or higher

for RHD
Tester Connection	Condition	Specified Condition
B32-3 (VC) - B23-113 (VCV1)	Always	Below 1 Ω
B32-3 (VC) or B23-113 (VCV1) - Body ground	Always	10 kΩ or higher

REPLACE ECM Click here

REPAIR OR REPLACE HARNESS OR CONNECTOR