Sfi System - P1341

Brand:

Toyota

Model Name:

4Runner GRN210 215 UZN210 215

Manual:

Repair Manual

Section:

2Uz-Fe Engine Control System

Title:

Sfi System

  1. Description

  2. Monitor description

  3. Monitor strategy

  4. Typical enabling conditions

  5. Typical malfunction thresholds

  6. Component operating range

  7. Wiring diagram

  8. Inspection procedure

  9. Check harness and connector (sensor power source)

  10. Check ecm terminal voltage

  11. Check harness and connector (ecm - camshaft position sensor)

  12. Inspect sensor installation

  13. Inspect camshaft timing pulley lh (signal plate tooth)

DTC P1340 Camshaft Position Sensor "A" (Bank 1 Sensor 2)

DTC P1341 Camshaft Position Sensor "A" (Bank 1 Sensor 2 )


​

DESCRIPTION

The camshaft position sensor (G signal) consists of a magnet, iron core and pickup coil.
The camshaft drive gear (LH) has 3 teeth on its inner circumstance. When the camshaft gear rotates, air gap changes between the protrusion on the gear and the pickup coil. The change affects the magnetic field and results in changes in the resistance of the MRE element.
The crankshaft signal plate has 32 teeth and is mounted on the crankshaft. The crankshaft position sensor generates 32 signals at every engine revolution. The ECM detects the standard crankshaft angle based on the G signal and the actual crankshaft angle and the engine speed by the NE signal.

DTC No.
DTC Detection Condition
Trouble Area
P1340
P1341
No camshaft position sensor signal to ECM during cranking (2 trip detection logic)
  1. Open or short in camshaft position sensor circuit
  2. Camshaft position sensor
  3. Camshaft timing pulley LH
  4. ECM
No camshaft position sensor signal to ECM with engine speed 600 rpm or more

MONITOR DESCRIPTION

The camshaft position sensor (G signal) consists of a magnet and MRE element.
The camshaft drive gear has 5 teeth on its inner circumference. When the camshaft gear rotates, air gap changes between the protrusion on the gear and the pickup coil. The change affects the magnetic field and results in changes in the resistance of the MRE element. The crankshaft angle sensor plate has 32 teeth and outputs 32 signals at every engine revolution. The ECM detects the standard crankshaft angle based on the G signal and actual crankshaft angle and engine speed by NE signal.

MONITOR STRATEGY


Related DTCs
P1340: Camshaft position sensor range check
P1340: Camshaft position / Crankshaft position misalignment
P1341: Camshaft position sensor malfunction
Required Sensors/Components (Main)
Camshaft position sensor
Required Sensors/Components (Related)
Crankshaft position sensor, Engine speed sensor
Frequency of Operation
Continuous
Duration
5 seconds
MIL Operation
2 driving cycles: Camshaft position sensor range check
Immediate: Camshaft position / Crankshaft position misalignment and camshaft position sensor malfunction
Sequence of Operation
None

TYPICAL ENABLING CONDITIONS


All:
The monitor will run whenever these DTCs are not present
None

Camshaft position sensor range check:
Starter
ON
Minimal battery voltage while starter ON
Less than 11 V

Camshaft position / Crankshaft position misalignment:
Engine RPM
600 rpm or more
Starter
OFF

Camshaft position sensor malfunction:
Starter
After OFF to ON timing

TYPICAL MALFUNCTION THRESHOLDS


Camshaft position sensor range check:
Camshaft position signal
No signal

Camshaft position / Crankshaft position misalignment:
Camshaft position and crankshaft position phase
Misaligned

Camshaft position sensor malfunction:
Camshaft position and crankshaft position phase
Misaligned
Camshaft position signal per 2 revolutions of crankshaft
12 signals or more

COMPONENT OPERATING RANGE


Camshaft position sensor signal
  1. Camshaft position sensor voltage fluctuates when the camshaft rotates
  2. 3 signals per revolution of crankshaft

WIRING DIAGRAM

Refer to DTC P0335 (Click here).

INSPECTION PROCEDURE

HINT:
Read freeze frame data using the intelligent tester. 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.
1.CHECK HARNESS AND CONNECTOR (SENSOR POWER SOURCE)
  1. Disconnect the C1 camshaft position sensor connector. 4Runner

  2. Disconnect the C1 camshaft position sensor connector.

  1. Turn the ignition switch ON.

  1. Measure the voltage between terminal 3 of the camshaft position sensor connector and body ground.

    Standard voltage:
    Tester Connection
    		Specified Condition
    C1-3 - Body ground
    		4.5 to 5.0 V

  1. Reconnect the camshaft position sensor connector.



NGnext
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
next down

2.CHECK ECM TERMINAL VOLTAGE
  1. Inspect the ECM using an oscilloscope.While the engine is idling, check the waveform between the terminals of the ECM connector.Standard voltage:Tester ConnectionSpecified ConditionG2+ (E6-19) - G2- (E6-29)Correct waveform is as shownHINT: *1: Crank angle*2: 180°*3: 120°*4: 60° 4Runner

  2. Inspect the ECM using an oscilloscope.

    1. While the engine is idling, check the waveform between the terminals of the ECM connector.

      Standard voltage:
      Tester Connection
      		Specified Condition
      G2+ (E6-19) - G2- (E6-29)
      		Correct waveform is as shown
      HINT:
      1. *1: Crank angle
      2. *2: 180°
      3. *3: 120°
      4. *4: 60°


OKnext
REPLACE ECM
NG
next down

3.CHECK HARNESS AND CONNECTOR (ECM - CAMSHAFT POSITION SENSOR)
  1. Disconnect the C1 Camshaft position sensor connector. 4Runner

  2. Disconnect the C1 Camshaft position sensor connector.

  1. Disconnect the E6 ECM connector.

  1. Measure the resistance between wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    Camshaft position sensor (C1-2) - G2+ (E6-19)
    		Below 1 Ω
    Camshaft position senssor (C1-1) - G2- (E6-29)
    Camshaft position sensor (C1-2) or G2+ (E6-19) - Body ground
    		10 kΩ or higher
    Camshaft position sensor (C1-1) or G2- (E6-29) - Body ground

  1. Reconnect the ECM connector.

  1. Reconnect the Camshaft position sensor connector.



NGnext
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
next down

4.INSPECT SENSOR INSTALLATION
  1. Check the camshaft position sensor installation.OK:The camshaft position sensor is installed properly. 4Runner

  2. Check the camshaft position sensor installation.

    OK:
    The camshaft position sensor is installed properly.


NGnext
REPAIR OR REPLACE SENSOR
OK
next down

5.INSPECT CAMSHAFT TIMING PULLEY LH (SIGNAL PLATE TOOTH)


NGnext
REPLACE CAMSHAFT TIMING PULLEY LH
OK
next down
REPLACE CAMSHAFT POSITION SENSOR