Toyota Tundra Service Manual: Camshaft Position Sensor "A" (Bank 1 Sensor 2) (P1340,P1342,P1343)

Toyota Tundra Service Manual / Engine, Hybrid System / 1ur-fe Engine Control / Sfi System / Camshaft Position Sensor "A" (Bank 1 Sensor 2) (P1340,P1342,P1343)

DESCRIPTION

The camshaft position sensor (G signal) consists of a magnet and MRE (Magnetoresistive Element).

The camshaft drive gear (LH) has 3 teeth on its outer circumference. When the camshaft gear rotates, the air gap between the protrusion on the gear and the MRE changes. The change affects the magnetic field and results in changes in the resistance of the MRE.

The crankshaft sensor plate has 34 teeth and is mounted on the crankshaft. The crankshaft position sensor generates 34 signals per crankshaft revolution. The ECM detects the standard crankshaft angle based on the G signal, and the actual crankshaft angle and engine speed by the NE signal.

DTC No.

DTC Detection Condition

Trouble Area

P1340

No camshaft position sensor signal to ECM during cranking (2 trip detection logic)

  • Open or short in camshaft position sensor circuit
  • Camshaft position sensor
  • Camshaft timing plate LH
  • ECM

No camshaft position sensor signal to ECM with engine speed 600 rpm or more (1 trip detection logic)

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)

MONITOR DESCRIPTION

If no signal is transmitted by the camshaft position sensor despite the engine running, or the rotations of the camshaft and crankshaft are not synchronized, the ECM interprets this as a malfunction of the sensor. Also, when the sensor output voltage remains below 0.3 V, or higher than 4.7 V for more than 4 seconds, the ECM stores a DTC.

MONITOR STRATEGY

Related DTCs

P1340: Camshaft position sensor verify pulse input

P1340: Camshaft position / Crankshaft position misalignment

P1342: Camshaft position sensor range check (low voltage)

P1343: Camshaft position sensor range check (high voltage)

Required Sensors/Components (Main)

Camshaft position sensor

Required Sensors/Components (Related)

Crankshaft position sensor, Engine speed sensor

Frequency of Operation

Continuous

Duration

4 seconds:

P1340 camshaft position sensor verify pulse input

P1342: Camshaft position sensor range check (low voltage)

P1343: Camshaft position sensor range check (high voltage)

5 seconds:

P1340 camshaft position / crankshaft position misalignment

MIL Operation

2 driving cycles: P1340 camshaft position sensor verify pulse input

Immediate: P1340 camshaft position / crankshaft position misalignment and P1342, P1343 camshaft position sensor range check

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

P1340 Camshaft Position Sensor Verify Pulse Input

Monitor runs whenever following DTCs not present

None

Starter

ON (Not including when starter turned ON multiple times)

Minimum battery voltage while starter ON

Less than 11 V

P1340 Camshaft Position / Crankshaft Position Misalignment

Monitor runs whenever following DTCs not present

P0342, P0343 (VVT sensor)

P1342, P1343 (Camshaft position sensor)

Engine RPM

600 rpm or more

Starter

OFF

Camshaft position sensor range

0.3 to 4.7 V

P1342, P1343 Camshaft Position Sensor Range Check

Monitor runs whenever following DTCs not present

P0340 (VVT sensor)

P1340 (Camshaft position sensor)

Time after ignition switch off to ON

2 seconds or more

Battery voltage

8 V or more

Starter

OFF

TYPICAL MALFUNCTION THRESHOLDS

P1340 Camshaft Position Sensor Verify Pulse Input

Camshaft position signal

No signal

P1340 Camshaft Position / Crankshaft Position Misalignment

Camshaft position and crankshaft position phase

Misaligned

P1342 Camshaft Position Sensor Range Check

Camshaft position sensor voltage

Less than 0.3 V

P1343 Camshaft Position Sensor Range Check

Camshaft position sensor voltage

More than 4.7 V

COMPONENT OPERATING RANGE

Camshaft position sensor signal

  • Camshaft position sensor voltage fluctuates when the camshaft rotates
  • 3 signals per revolution of camshaft

CONFIRMATION DRIVING PATTERN

  1. Connect the Techstream to the DLC3.
  2. Turn the ignition switch to ON and turn the Techstream on.
  3. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
  4. Turn the ignition switch off and wait for at least 30 seconds.
  5. Turn the ignition switch to ON and turn the Techstream on [A].
  6. Start the engine.
  7. Idle the engine for 10 seconds or more.
  8. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [B].
  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. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
  11. Input the DTC: P1340, P1342 or P1343.
  12. 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

    HINT:

    If the judgment result shows INCOMPLETE or N/A, perform steps [A] through [B] again.

  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

CAUTION / NOTICE / HINT

HINT:

Read freeze frame data using the Techstream. Freeze frame data records the engine conditions 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.

PROCEDURE

1.

INSPECT CAMSHAFT POSITION SENSOR (SENSOR POWER SOURCE)

(a) Disconnect the camshaft position sensor 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

D6-3 (VC) - Body ground

Ignition switch ON

4.5 to 5.0 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2.

CHECK HARNESS AND CONNECTOR (ECM - CAMSHAFT POSITION SENSOR)

(a) Disconnect the camshaft position sensor connector.

(b) Disconnect the ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D6-1 (G2) - D74-90 (G2)

Always

Below 1 Ω

D6-2 (G-) - D74-89 (G2-)

Always

Below 1 Ω

D6-1 (G2) or D74-90 (G2) - Body ground

Always

10 kΩ or higher

D6-2 (G-) or D74-89 (G2-) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

CHECK SENSOR INSTALLATION

(a) Check the camshaft position sensor installation.

OK:

The camshaft position sensor is installed properly.

NG

SECURELY REINSTALL SENSOR

OK

4.

INSPECT CAMSHAFT TIMING PLATE (SENSOR PLATE TOOTH)

(a) Check the teeth of the sensor plate.

OK:

Sensor plate teeth do not have any cracks or deformation.

NG

REPLACE CAMSHAFT TIMING PLATE

OK

5.

REPLACE CAMSHAFT POSITION SENSOR

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

NEXT

6.

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 DTCs (See page ).

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

(f) Read DTCs.

Result

Result

Proceed to

No DTC is output

A

P1340, P1342 and/or P1343 is output

B

HINT:

If the engine does not start, replace the ECM.

A

END

B

REPLACE ECM

    Brake Switch "B" Circuit High (P0724)

    Engine Stall History (P1603,P1605)

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