2Zr-Fe Engine Control. Dtc P0340 Camshaft Position Sensor Circuit Malfunction

The camshaft position sensor for intake camshaft (G signal sensor) consists of a magnet and MRE.
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, 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) 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 inputs normal at engine speed of 600 rpm or more (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 more 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

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.
HINT:
1. The correct waveform is as shown.
2. G2+ and EV1+ are camshaft position sensor signals.
ECM Terminal Name
Between G2+ and G2-
Between EV1+ and EV1-
Tester Range
5 V/DIV, 20 ms/DIV
Condition
Idling after engine warmed-up

MONITOR DESCRIPTION

If no signal is transmitted by the camshaft position sensor despite the engine 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 more than 4.7 V for more than 4 seconds, the ECM stores a DTC.

MONITOR STRATEGY

Related DTCs	P0340: Camshaft position sensor 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: P0340 (case 1), P0342, P0343 5 seconds: P0340 (case 2)
MIL Operation	2 driving cycles: P0340 (case 1) Immediate: P0340 (case 2), P0342, P0343
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

All
Monitor runs whenever following DTCs not present	None

P0340 (Case 1)
Starter	On
Minimum battery voltage while starter on	Less than 11 V

P0340 (Case 2)
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
Starter	Off
Ignition switch	ON
Time after ignition switch off to ON	2 seconds
Camshaft position sensor pulse input fail (P0340)	Not detected

TYPICAL MALFUNCTION THRESHOLDS

P0340 (Case 1)
Camshaft position sensor signal	No signal

P0340 (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	Less than 0.3 V

P0343: Camshaft Position Sensor Range Check
Camshaft position sensor voltage	More than 4.7 V

COMPONENT OPERATING RANGE

Camshaft position sensor voltage

0.3 to 4.7 V

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 operation) (COROLLA_ZRE142 RM000000PDK0ZAX.html).
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, P0342 or P0343.

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 RM000000PDK0ZAX.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:

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 be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
If no problem is found through this diagnostic troubleshooting procedure, troubleshoot the engine mechanical system.

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

Corolla. Zre142 Aze141.2Zr-Fe Engine Control.Sfi System.
Dtc
P0340 Camshaft Position Sensor Circuit Malfunction

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
B21-3 (VC) - Body ground
Ignition switch ON
4.5 to 5.5 V

Reconnect the camshaft position sensor (for intake camshaft) connector.

Go to step 9

OK

2.CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT) - 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 (Check for Open):

Tester Connection
Condition
Specified Condition
B21-1 (VVI+) - B31-94 (G2+)
Always
Below 1 Ω
B21-2 (VVI-) - B31-118 (G2-)
Always
Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection
Condition
Specified Condition
B21-1 (VVI+) or B31-94 (G2+) - Body ground
Always
10 kΩ or higher
B21-2 (VVI-) or B31-118 (G2-) - Body ground
Always
10 kΩ or higher

Reconnect the camshaft position sensor (for intake camshaft) connector.

Reconnect the ECM connector.

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

OK

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

Check the camshaft position sensor (for intake camshaft) installation.
OK:
Sensor is installed correctly.

SECURELY REINSTALL SENSOR (COROLLA_ZRE142 RM0000030L0014X.html)

OK

4.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 RM0000027IB0ABX.html)

OK

5.REPLACE CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT)

Replace the camshaft position sensor (COROLLA_ZRE142 RM0000030KZ017X.html).

NEXT

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

Connect the Techstream to the DLC3.

Turn the ignition switch to ON.

Turn the Techstream on.

Clear DTCs (COROLLA_ZRE142 RM000000PDK0ZAX.html).

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

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

Read the DTCs.

Result:

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.

END

A

7.ADJUST VALVE TIMING

HINT:

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 (COROLLA_ZRE142 RM000002XA40C3X.html).

NEXT

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

Connect the Techstream to the DLC3.

Turn the ignition switch to ON.

Turn the Techstream on.

Clear DTCs (COROLLA_ZRE142 RM000000PDK0ZAX.html).

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

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

Read the DTCs.

Result:

Result
Proceed to
DTC is not output
A
DTC P0340, P0342 or P0343 is output
B
HINT:
If the engine does not start, replace the ECM.

REPLACE ECM (COROLLA_ZRE142 RM000001CN0030X.html)

END

9.CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT) - 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 (Check for Open):

Tester Connection
Condition
Specified Condition
B21-3 (VC) - B31-119 (VCV1)
Always
Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection
Condition
Specified Condition
B21-3 (VC) or B31-119 (VCV1) - Body ground
Always
10 kΩ or higher

Reconnect the camshaft position sensor (for intake camshaft) connector.

Reconnect the ECM connector.

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

REPLACE ECM (COROLLA_ZRE142 RM000001CN0030X.html)

ECM Terminal Name	Between G2+ and G2- Between EV1+ and EV1-
Tester Range	5 V/DIV, 20 ms/DIV
Condition	Idling after engine warmed-up

Tester Connection	Switch Condition	Specified Condition
B21-3 (VC) - Body ground	Ignition switch ON	4.5 to 5.5 V

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

Tester Connection	Condition	Specified Condition
B21-1 (VVI+) - B31-94 (G2+)	Always	Below 1 Ω
B21-2 (VVI-) - B31-118 (G2-)	Always	Below 1 Ω

Tester Connection	Condition	Specified Condition
B21-1 (VVI+) or B31-94 (G2+) - Body ground	Always	10 kΩ or higher
B21-2 (VVI-) or B31-118 (G2-) - Body ground	Always	10 kΩ or higher