SFI SYSTEM, Diagnostic DTC:P1340, P1342, P1343

DTC Code	DTC Name
P1340	Camshaft Position Sensor "A" (Bank 1 Sensor 2)
P1342	Camshaft Position Sensor "A" Low Input (MRE)
P1343	Camshaft Position Sensor "A" High Input (MRE)

DESCRIPTION

The camshaft position sensor system consists of a signal plate (installed on the camshaft timing gear assembly bank 2) and Magnetic Resistance Element (MRE) type camshaft position sensor. The signal plate has 3 protrusions. When it rotates, the magnetic vector (direction of magnetic field) applied to the camshaft's MRE varies, which causes its resistance to vary. This varying resistance is converted to voltage, and then modified into a rectangular waveform with Hi (approximately 4 V) and Lo (approximately 1 V) outputs. As a result, the G2 signal is output to the ECM. The ECM uses the G2 signal to distinguish between the cylinders and detect the camshaft position.

DTC No.	DTC Detection Condition	Trouble Area
P1340	When either condition below is met: No camshaft position sensor signal to ECM during cranking (1 trip detection logic) No camshaft position sensor signal to ECM in appropriate timing with 600 rpm or more (misalignment of crankshaft/camshaft) (1 trip detection logic)	Open or short in camshaft position sensor circuit Camshaft position sensor Camshaft timing gear assembly (for Bank 2) Jumped tooth of timing chain ECM
P1342	Output voltage of camshaft position sensor less than 0.3 V for 4 seconds (1 trip detection logic)
P1343	Output voltage of camshaft position sensor more than 4.7 V for 4 seconds (1 trip detection logic)

DTC No.

DTC Detection Condition

Trouble Area

P1340

When either condition below is met:

No camshaft position sensor signal to ECM during cranking (1 trip detection logic)
No camshaft position sensor signal to ECM in appropriate timing with 600 rpm or more (misalignment of crankshaft/camshaft) (1 trip detection logic)

Open or short in camshaft position sensor circuit
Camshaft position sensor
Camshaft timing gear assembly (for Bank 2)
Jumped tooth of timing chain
ECM

P1342

Output voltage of camshaft position sensor less than 0.3 V for 4 seconds

(1 trip detection logic)

P1343

Output voltage of camshaft position sensor more than 4.7 V for 4 seconds

(1 trip detection logic)

Reference: Inspection using an oscilloscope.

Tech Tips

The correct waveform is as shown.

G2+ stands for the camshaft position sensor signal, and NE+ stands for the CKP sensor signal.

Item	Content
Terminal	NE+ - NE- G2+ - G2-
Equipment Setting	5 V/DIV., 20 msec./DIV.
Condition	Cranking or idling

Item

Content

Terminal

NE+ - NE-

G2+ - G2-

Equipment Setting

5 V/DIV., 20 msec./DIV.

Condition

Cranking or idling

MONITOR DESCRIPTION

If there is no signal from the camshaft position sensor even though the engine is turning, or if the rotation of the camshaft and the crankshaft is not synchronized, the ECM interprets this as a malfunction of the sensor.

When the sensor output voltage remains less than 0.3 V, or more than 4.7 V for more than 5 seconds, the ECM sets a DTC.

WIRING DIAGRAM

INSPECTION PROCEDURE

Tech Tips

Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition 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.
When viewed from the rear of the engine assembly, Bank 1 is on the left side and Bank 2 is on the right side.

PROCEDURE

CHECK CAMSHAFT POSITION SENSOR (SENSOR POWER SOURCE)

Disconnect the E20 camshaft position (CMP) sensor connector.

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

Standard voltage

Tester Connection	Switch Condition	Specified Condition
E20-3 (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 E20 camshaft position sensor connector.
Disconnect the E2 ECM connector.

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

Standard resistance (Check for open)

Tester Connection	Condition	Specified Condition
E20-1 (G22+) - E2-24 (G2+)	Always	Below 1 Ω
E20-2 (G22-) - E2-32 (G2-)	Always	Below 1 Ω

Standard resistance (Check for short)

Tester Connection	Condition	Specified Condition
E20-1 (G22+) or E1-24 (G2+) - Body ground	Always	10 kΩ or higher
E20-2 (G22-) or E1-32 (G2-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK SENSOR INSTALLATION
1. Check the sensor installation.
  
  OK
  
  Sensor is installed correctly.
NG
SECURELY REINSTALL SENSOR Click here

OK
INSPECT CAMSHAFT TIMING GEAR ASSEMBLY (for Bank 2)
1. Check the teeth of the sensor plate.
  
  OK
  
  Sensor plate teeth do not have any cracks or deformation.
NG
REPLACE CAMSHAFT TIMING GEAR ASSEMBLY (for Bank 2) Click here

OK
CHECK VALVE TIMING
1. Remove the cylinder head cover sub-assembly (for Bank 1 and Bank 2) Click here.
2. Turn the crankshaft pulley, and align its groove with the timing mark "0" of the timing chain cover.
3. Check that the timing marks of the camshaft timing gears and camshaft timing exhaust gears are at the positions shown in the illustration.
  
  OK
  
  Timing marks on camshaft timing gears are aligned as shown in the illustration.
4. Reinstall the cylinder head cover sub-assembly (for Bank 1 and Bank 2) Click here.
NG
ADJUST VALVE TIMING Click here

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

OK
Sensor is installed correctly.

OK
Sensor plate teeth do not have any cracks or deformation.

OK
Timing marks on camshaft timing gears are aligned as shown in the illustration.

CHECK WHETHER DTC OUTPUT RECURS (DTC P1340, P1342 AND/OR P1343)

Connect the intelligent tester to the DLC3.
Turn the power switch on (IG).
Turn the tester ON.
Clear DTCs Click here.
Put the engine in inspection mode Click here.
Idle the engine for 10 seconds or more.
Enter the following menus: Powertrain / Engine and ECT / DTC.

Read the DTCs.

Result
Display (DTC Output)	Proceed to
No output	A
P1340, P1342 and P1343	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 E20 camshaft position sensor connector.
Disconnect the E1 ECM connector.

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

Standard resistance (Check for open)

Tester Connection	Condition	Specified Condition
E20-3 (VC) - E1-18 (VC)	Always	Below 1 Ω

Standard resistance (Check for short)

Tester Connection	Condition	Specified Condition
E20-3 (VC) or E1-18 (VC) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE ECM Click here