Brand:

Toyota

Model Name:

Yaris NCP90 91 92 93

Manual:

Repair Manual

Section:

1Nz-Fe Engine Control System

Title:

Sfi System

  1. Description

  2. Wiring diagram

  3. Inspection procedure

  4. Inspect camshaft position sensor (resistance)

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

  6. Check sensor installation (camshaft position sensor)

  7. Check valve timing

  8. Check camshaft

  9. Replace camshaft position sensor

  10. Check whether dtc output recurs (dtc p0340)

DTC P0340 Camshaft Position Sensor "A" Circuit (Bank 1 or Single Sensor)


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DESCRIPTION

The Camshaft Position (CMP) 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 CMP 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 CMP 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 Conditions
Trouble Areas
P0340
Case 1
  1. No Camshaft Position (CMP) sensor signal to ECM while cranking (2 trip detection logic)
Case 2
  1. Camshaft/Crankshaft misalignment detected at engine speed of 600 rpm or more (1 trip detection logic)
  1. Open or short in CMP sensor circuit
  2. CMP sensor
  3. Camshaft
  4. Jumped tooth of timing chain
  5. ECM
HINT:
DTC P0340 indicates a malfunction relating to the CMP sensor (+) circuit (the wire harness between the ECM and CMP sensor, and the CMP sensor itself).
Reference: Inspection using an oscilloscope
The correct waveform is as shown in the illustration. Yaris
HINT:
  1. The correct waveform is as shown in the illustration.
  2. G2+ stands for the CMP sensor signal, and NE+ stands for the Crankshaft Position (CKP) sensor signal.
  3. Grounding failure of the shielded wire may cause noise in waveforms.
Items
Contents
Terminals
CH1: G2+ - NE-
CH2: NE+ - NE-
Equipment Settings
5 V/Division, 20 ms./Division
Conditions
Cranking or idling

WIRING DIAGRAM

Refer to DTC P0335 (Click here).

INSPECTION PROCEDURE

HINT:
Read freeze frame data using an intelligent tester. Freeze frame data record 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.
1.INSPECT CAMSHAFT POSITION SENSOR (RESISTANCE)
  1. Disconnect the C18 Camshaft Position (CMP) sensor connector. Yaris

  2. Disconnect the C18 Camshaft Position (CMP) sensor connector.

  1. Measure the resistance between terminals 1 and 2.

    Standard resistance:
    Tester Connections
    		Conditions
    		Specified Conditions
    1 - 2
    		Cold
    		1,630 to 2,740 Ω
    1 - 2
    		Hot
    		2,065 to 3,225 Ω
    HINT:
    Terms cold and hot refer to the temperature of the coils. Cold means approximately -10° to 50°C (14 ° to 122°F). Hot means approximately 50° to 100°C (122° to 212°F).

  1. Reconnect the CMP sensor connector.



NGnext
REPLACE CAMSHAFT POSITION SENSOR (Click here)
OK
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2.CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM)
  1. Disconnect the C18 CMP sensor connector. Yaris

  2. Disconnect the C18 CMP sensor connector.

  1. Disconnect the C20 ECM connector.

  1. Check the resistance.

    Standard resistance (Check for open):
    Tester Connections
    		Specified Conditions
    G2+ (C18-1) - G2+ (C20-99)
    		Below 1 Ω
    NE- (C18-2) - NE- (C20-121)
    Standard resistance (Check for short):
    Tester Connections
    		Specified Conditions
    G2+ (C18-1) or G2+ (C20-99) - Body ground
    		10 kΩ or higher
    NE- (C18-2) or NE- (C20-121) - Body ground

  1. Reconnect the ECM connector.

  1. Reconnect the CMP sensor connector.



NGnext
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
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3.CHECK SENSOR INSTALLATION (CAMSHAFT POSITION SENSOR)
  1. Check the CMP sensor installation.OK:Sensor is installed correctly. Yaris

  2. Check the CMP sensor installation.

    OK:
    Sensor is installed correctly.


NGnext
SECURELY REINSTALL SENSOR
OK
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4.CHECK VALVE TIMING
  1. Remove the cylinder head cover. Yaris

  2. Remove the cylinder head cover.

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

  1. Check that the timing marks on the camshaft timing sprocket and camshaft timing gear are facing upward as shown in the illustration.

    1. If not, turn the crankshaft 1 revolution (360°), then align the marks as above.
    OK:
    Timing marks on camshaft timing gears are aligned as shown in the illustration.

  1. Reinstall the cylinder head cover.



NGnext
ADJUST VALVE TIMING
OK
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5.CHECK CAMSHAFT

  1. Check the teeth of the camshaft.

    OK:
    Camshaft teeth do not have any cracks or deformation.


NGnext
REPLACE CAMSHAFT (Click here)
OK
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6.REPLACE CAMSHAFT POSITION SENSOR

NEXT
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7.CHECK WHETHER DTC OUTPUT RECURS (DTC P0340)

  1. Connect an intelligent tester to the DLC3.

  1. Turn the ignition switch to ON and turn the tester on.

  1. Clear DTCs (Click here).

  1. Start the engine.

  1. Select the following menu items: Powertrain / Engine and ECT / DTC.

  1. Read DTCs.

    Result:
    Display (DTC Output)
    		Proceed To
    No output
    		A
    P0340
    		B
HINT:
If the engine does not start, replace the ECM.


Bnext
END
A
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REPLACE ECM (Click here)