SFI SYSTEM (w/o EGR 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 (G2 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 MR element, which affects the magnet. 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 duration and injection timing.

DTC No.	DTC Detection Condition	Trouble Area
P0340	When ether of following conditions is met: No camshaft position sensor signal to ECM at engine speed 600 rpm or more (1 trip detection logic). Missing camshaft position sensor signal despite crankshaft position sensor inputs normal at engine speed of 600 rpm or more (1 trip detection logic).	Open or short in camshaft position sensor circuit Camshaft position sensor Intake camshaft Jumped tooth of timing chain ECM
P0342	Output voltage of camshaft position sensor below 0.3 V for 4 seconds (1 trip detection logic).	Open or short in camshaft position sensor circuit Camshaft position sensor ECM
P0343	Output voltage of camshaft position sensor higher than 4.7 V for 4 seconds (1 trip detection logic).	Open or short in camshaft position sensor circuit Camshaft position sensor ECM

DTC No.

DTC Detection Condition

Trouble Area

P0340

When ether of following conditions is met:

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

Open or short in camshaft position sensor circuit
Camshaft position sensor
Intake camshaft
Jumped tooth of timing chain
ECM

P0342

Output voltage of camshaft position sensor below 0.3 V for 4 seconds (1 trip detection logic).

Open or short in camshaft position sensor circuit
Camshaft position sensor
ECM

P0343

Output voltage of camshaft position sensor higher than 4.7 V for 4 seconds (1 trip detection logic).

Open or short in camshaft position sensor circuit
Camshaft position sensor
ECM

Reference: Inspection using an oscilloscope.

Standard

Tester Connection	Tool Setting	Condition	Specified Condition
D27-76 (G2+) - D27-122 (G2-)	5 V/DIV., 20 ms./DIV.	Idling with warm engine	The correct waveform is as shown

MONITOR DESCRIPTION

If no 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 less than 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 power switch on (IG) and turn the tester on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the power switch off and wait for at least 30 seconds.
Turn the power switch on (IG) and turn the tester on.
Put the engine in inspection mode (maintenance mode) Click here.
Start the engine.
Idle the engine for 10 seconds or more [A].
Enter the following menus: Powertrain / Engine and ECT / DTC [B].
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

Refer to DTC P0335 Click here.

INSPECTION PROCEDURE

Tech Tips

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.
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)

Text in Illustration

*a
Front view of wire harness connector

(to Camshaft Position Sensor)

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

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

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

Standard Voltage

Tester Connection	Condition	Specified Condition
D18-3 (VC) - Body ground	Power switch on (IG)	4.5 to 5.0 V

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

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
D18-1 (VVI+) - D27-76 (G2+)	Always	Below 1 Ω
D18-2 (VVI-) - D27-122 (G2-)	Always	Below 1 Ω
D18-1 (VVI+) or D27-76 (G2+) - Body ground	Always	10 kΩ or higher
D18-2 (VVI-) or D27-122 (G2-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK SENSOR INSTALLATION (CAMSHAFT POSITION SENSOR)
1. Check the camshaft position sensor 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
  
  Timing rotor does not have any cracks or deformation.
NG
REPLACE INTAKE CAMSHAFT Click here

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

OK
Camshaft position sensor is installed correctly.

OK
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 power switch on (IG).
Turn the tester on.
Clear the DTCs Click here.
Drive the vehicle in accordance with the driving pattern described in the 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

ADJUST VALVE TIMING

Text in Illustration
*a	Top
*b	Alignment Mark
*c	No. 1 Cylinder at TDC Compression

Tech Tips

There are no marks on the cylinder head to match-up for the purpose of checking valve timing. Valve timing can only be inspected by lining up the colored plates on the timing chain with the marks on the pulleys. It may be necessary to remove and reinstall the chain to match-up the alignment marks Click here.

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

Connect the intelligent tester to the DLC3.
Turn the power switch on (IG).
Turn the tester on.
Clear the DTCs Click here.
Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
Enter the following menus: Powertrain / Engine and ECT / DTC.

Read the DTCs.

Result
Result	Proceed to
DTC is not output	A
DTC P0340, P0342 or P0343 is 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 connector.
Disconnect the ECM connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
D18-3 (VC) - D27-99 (VCV1)	Always	Below 1 Ω
D18-3 (VC) or D27-99 (VCV1) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE ECM Click here