2Az-Fe Engine Control. Dtc P0340 Camshaft Position Sensor A Circuit (Bank 1 Or Single Sensor)

The camshaft position sensor consists of a magnet and an iron core which is wrapped with copper wire, and is installed onto the cylinder head. When the camshaft rotates, each of 3 teeth on the camshaft passes 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 either of following conditions is met: No camshaft position sensor signal to ECM while cranking (2 trip detection logic) No camshaft position sensor signal to ECM at engine speed of 600 rpm or more (1 trip detection logic) Missing camshaft position sensor signal despite crankshaft position sensor signal 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 Valve timing ECM

HINT:

DTC P0340 indicates a malfunction relating to the camshaft position sensor circuit (the wire harness between the ECM and camshaft position sensor, and the camshaft position sensor itself).

Reference: Inspection using an oscilloscope (COROLLA_ZRE142 RM000000TCW0SDX_01.html).

MONITOR DESCRIPTION

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

MONITOR STRATEGY

Related DTCs	P0340: Camshaft position sensor verify pulse input
Required Sensors/Components (Main)	Camshaft position sensor
Required Sensors/Components (Related)	Crankshaft position sensor
Frequency of Operation	Continuous
Duration	4 seconds: Case 1 5 seconds: Case 2
MIL Operation	2 driving cycles: Case 1 Immediate: Case 2
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

All
Monitor runs whenever following DTCs are not present	None

Case 1
Starter	On
Minimum battery voltage while starter On	Less than 11 V

Case 2
Engine speed	600 rpm or more
Starter	Off

TYPICAL MALFUNCTION THRESHOLDS

Case 1
Camshaft position sensor signal	No signal

Case 2
Camshaft position and crankshaft position phase	Misaligned
Camshaft position sensor signal	No signal

COMPONENT OPERATING RANGE

Camshaft position sensor

Camshaft position sensor output voltage fluctuates while camshaft rotating
3 camshaft position sensor signals per 2 crankshaft revolutions

CONFIRMATION DRIVING PATTERN

Connect the Techstream to the DLC3.
Turn the ignition switch to ON and turn the Techstream 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 Techstream on.
Start the engine.
Idle the engine for 10 seconds or more [A].
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [B].
Read the pending DTCs.
HINT:
1. If a pending DTC is output, the system is malfunctioning.
2. 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.

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.

If no pending DTC is output, perform a universal trip and check for permanent DTCs (COROLLA_ZRE142 RM000000PDK0ZBX.html).
HINT:
1. If a permanent DTC is output, the system is malfunctioning.
2. If no permanent DTC is output, the system is normal.

WIRING DIAGRAM

Refer to DTC P0335 (Link).

INSPECTION PROCEDURE

HINT:

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 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.

1.INSPECT CAMSHAFT POSITION SENSOR (RESISTANCE)

Inspect the camshaft position sensor (COROLLA_ZRE142 RM0000017V5020X.html).

REPLACE CAMSHAFT POSITION SENSOR (COROLLA_ZRE142 RM0000017V603MX.html)

OK

2.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 (Check for Open):

Tester Connection
Condition
Specified Condition
B68-1 - B31-99 (G2+)
Always
Below 1 Ω
B68-2 - B31-98 (G2-)
Always
Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection
Condition
Specified Condition
B68-1 or B31-99 (G2+) - Body ground
Always
10 kΩ or higher
B68-2 or B31-98 (G2-) - Body ground
Always
10 kΩ or higher

Reconnect the ECM connector.

Reconnect the camshaft position sensor connector.

REPAIR OR REPLACE HARNESS OR CONNECTOR (CAMSHAFT POSITION SENSOR - ECM)

OK

3.CHECK SENSOR INSTALLATION (CAMSHAFT POSITION SENSOR)

Corolla. Zre142 Aze141.2Az-Fe Engine Control.Sfi System.
Dtc
P0340 Camshaft Position Sensor A Circuit (Bank 1 Or Single Sensor)

Check the camshaft position sensor installation.
OK:
Sensor is installed correctly.

SECURELY REINSTALL SENSOR (COROLLA_ZRE142 RM0000017V4053X.html)

OK

4.CHECK VALVE TIMING

Remove the cylinder head cover (COROLLA_ZRE142 RM0000032Z3011X.html).

Turn the crankshaft pulley, and align its groove with the alignment mark "0" of the timing chain cover.

Check that the alignment marks of the camshaft timing gears are aligned with the alignment marks of the bearing cap as shown in the illustration.
If not, turn the crankshaft 1 revolution (360°), then align the marks as above.
OK:
Alignment marks on camshaft timing gears are aligned as shown in the illustration.

Reinstall the cylinder head cover (COROLLA_ZRE142 RM0000032Z4011X.html).

ADJUST VALVE TIMING (COROLLA_ZRE142 RM00000224800UX.html)

OK

5.INSPECT INTAKE CAMSHAFT (TIMING ROTOR)

Check the timing rotor of the intake camshaft.
OK:
Camshaft timing rotor does not have any cracks or deformation.

REPLACE INTAKE CAMSHAFT (COROLLA_ZRE142 RM0000032YD00XX.html)

OK

6.REPLACE CAMSHAFT POSITION SENSOR

Replace the camshaft position sensor (COROLLA_ZRE142 RM0000017V603MX.html).

NEXT

7.CHECK WHETHER DTC OUTPUT RECURS

Connect the Techstream to the DLC3.

Turn the ignition switch to ON.

Turn the Techstream on.

Clear the DTCs (COROLLA_ZRE142 RM000000PDK0ZBX.html).

Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.

Read DTCs.

Result:

Result
Proceed to
No output
A
P0340
B

HINT:

If the engine does not start, replace the ECM.

REPLACE ECM (COROLLA_ZRE142 RM000002WT402ZX.html)

END

Tester Connection	Condition	Specified Condition
B68-1 - B31-99 (G2+)	Always	Below 1 Ω
B68-2 - B31-98 (G2-)	Always	Below 1 Ω