Camshaft Position Sensor Circuit Malfunction (P0340,P0342,P0343)

DESCRIPTION

The camshaft position sensor (G signal sensor) for the intake camshaft 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 magnet. 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, are sends it 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 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 ECM at 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 (for intake camshaft) circuit Camshaft position sensor (for intake camshaft) Intake camshaft Timing chain jumped tooth 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 (for intake camshaft) circuit 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 (for intake camshaft) circuit Camshaft position sensor (for intake camshaft) ECM

Reference: Inspection using an oscilloscope.

• The correct waveform is as shown.
• G2 stands for the camshaft position sensor (for intake camshaft) signal and EV1 stands for the camshaft position sensor (for exhaust camshaft) signal.

Terminal No. (Symbol)	Tool Setting	Condition
B58-76 (G2+) - B58-122 (G2-)	5 V/DIV, 20 ms/DIV	Idling
B58-75 (EV1+) - B58-121 (EV1-)	5 V/DIV, 20 ms/DIV	Idling

MONITOR DESCRIPTION

If no signal is transmitted by the camshaft position sensor despite the camshaft revolving, 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 or more, the ECM stores a DTC.

MONITOR STRATEGY

Related DTCs	P0340: Camshaft Position Verify Pulse Input P0342: Camshaft Position Sensor Range Check (Low Voltage) P0343: Camshaft Position Sensor Range Check (High Voltage)
Required Sensors/Components (Main)	Camshaft position sensor
Required Sensors/Components (Related)	Crankshaft position sensor
Frequency of Operation	Continuous
Duration	4 seconds: Camshaft position sensor verify pulse input (case 1) (P0340), Camshaft position sensor range check (P0342, P0343) 5 seconds: Camshaft position sensor verify pulse input (case 2) (P0340)
MIL Operation	2 driving cycles: Camshaft position sensor verify pulse input (case 1) (P0340) Immediate: Camshaft position sensor verify pulse input (case 2) (P0340), Camshaft position sensor range check (P0342, P0343)
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS P0340: Camshaft Position Sensor Verify Pulse Input (Case 1)

Monitor runs whenever the following DTCs are not stored	None
Both of the following conditions are met	-
Starter	ON
Minimum battery voltage while starter ON	Below 11 V

P0340: Camshaft Position Sensor Verify Pulse Input (Case 2)

Monitor runs whenever the following DTCs are not stored	None
All of the following conditions are met	-
Engine speed	600 rpm or more
Starter	OFF
VVT system mis-alignment	Not detected
Camshaft position sensor range check fail (P0342, P0343)	Not detected
Camshaft position sensor voltage	0.3 to 4.7 V

P0342, P0343: Camshaft Position Sensor Range Check

Monitor runs whenever the following DTCs are not stored	None
All of the following conditions are met	-
Starter	OFF
Ignition switch	ON
Time after ignition switch off to ON	2 seconds or more
Battery voltage	8 V or higher
Camshaft position sensor pulse input fail (P0340)	Not detected

TYPICAL MALFUNCTION THRESHOLDS P0340: Camshaft Position Sensor Verify Pulse Input (Case 1)

Camshaft position sensor signal

No signal

P0340: Camshaft Position Sensor Verify Pulse Input (Case 2)

Either of the following conditions is met	1 or 2
1. Camshaft position and crankshaft position alignment	Mis-aligned
2. Camshaft position sensor signal	No signal

P0342: Camshaft Position Sensor Range Check

Camshaft position sensor voltage

Below 0.3 V

P0343: Camshaft Position Sensor Range Check

Camshaft position sensor voltage

Higher than 4.7 V

COMPONENT OPERATING RANGE

Camshaft position sensor voltage

0.3 to 4.7 V

CONFIRMATION DRIVING PATTERN

1. 1
   Connect the Techstream to the DLC3.
2. 2
   Turn the ignition switch to ON and turn the Techstream on.
3. 3
   Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure) (See page ).
4. 4
   Turn the ignition switch off and wait for at least 30 seconds.
5. 5
   Turn the ignition switch to ON and turn the Techstream on.
6. 6
   Start the engine.
7. 7
   Idle the engine for 10 seconds or more [A].
8. 8
   Enter the following menus: Powertrain / Engine / Trouble Codes [B].
9. 9
   Read the Pending DTCs.

   HINT:

   • If a pending DTC is output, the system is malfunctioning.
   • If a pending DTC is not output, perform the following procedure.
10. 10
    Enter the following menus: Powertrain / Engine / Utility / All Readiness.
11. 11
    Input the DTC: P0340, P0342 or P0343.
12. 12
    Check the DTC judgment result.

    Techstream 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

    HINT:

    • 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 steps [A] and [B] again.
13. 13
    If no pending DTC is output, perform a universal trip and check for permanent DTCs (See page ).
    

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTC is output, the system is normal.

WIRING DIAGRAM

Refer to DTC P0335 (See page ).

CAUTION / NOTICE / HINT

HINT:

• Read freeze frame data using the Techstream. 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, there may be a mechanical problem with the engine.

PROCEDURE

1. INSPECT CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT) (POWER SOURCE)

(a) Disconnect the camshaft position sensor (for intake camshaft) connector.

(b) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
B55-3 (VC) - Body ground	Ignition switch ON	4.5 to 5.5 V

Text in Illustration

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

NG

GO TO STEP 8

OK

1. CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT) - ECM)

(a) Disconnect the camshaft position sensor (for intake camshaft) connector.

(b) Disconnect the ECM connector.

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

Standard Resistance (Check for Open):

Tester Connection	Condition	Specified Condition
B55-1 (VVI+) - B58-76 (G2+)	Always	Below 1 Ω
B55-2 (VVI-) - B58-122 (G2-)	Always	Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection	Condition	Specified Condition
B55-1 (VVI+) or B58-76 (G2+) - Body ground	Always	10 kΩ or higher
B55-2 (VVI-) or B58-122 (G2-) - Body ground	Always	10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

1. CHECK SENSOR INSTALLATION (CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT))

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

OK:

Sensor is installed correctly.

NG

SECURELY REINSTALL SENSOR

OK

1. INSPECT INTAKE CAMSHAFT (TIMING ROTOR)

(a) Check the timing rotor of the intake camshaft.

OK:

Camshaft timing rotor does not have any cracks or deformation.

HINT:

Perform "Inspection After Repair" after replacing the intake camshaft (See page ).

NG

REPLACE INTAKE CAMSHAFT

OK

1. CHECK VALVE TIMING

NG

GO TO STEP 9

OK

1. REPLACE CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT)

(a) Replace the camshaft position sensor (for intake camshaft) (See page ).

NEXT

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

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Clear the DTCs (See page ).

(e) Turn the ignition switch off and wait for at least 30 seconds.

(f) Start the engine and allow the engine to idle for 10 seconds or more.

(g) Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.

(h) Read the Pending DTCs.

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

HINT:

If the engine does not start, replace the ECM.

A

REPLACE ECM

B

END

1. CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT) - ECM)

(a) Disconnect the camshaft position sensor (for intake camshaft) connector.

(b) Disconnect the ECM connector.

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

Standard Resistance (Check for Open):

Tester Connection	Condition	Specified Condition
B55-3 (VC) - B58-99 (VCV1)	Always	Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection	Condition	Specified Condition
B55-3 (VC) or B58-99 (VCV1) - Body ground	Always	10 kΩ or higher

OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

1. CHECK ENGINE MECHANICAL SYSTEM

NG

REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA

OK

1. CHECK WHETHER DTC OUTPUT RECURS

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Clear the DTCs (See page ).

(e) Turn the ignition switch off and wait for at least 30 seconds.

(f) Start the engine and allow the engine to idle for 10 seconds or more.

(g) Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.

(h) Read the Pending DTCs.

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

A

REPLACE ECM

B

CHECK FOR INTERMITTENT PROBLEMS