Lexus IS250 · Service Manual ENGINE

P2014

Diagnostic trouble codes

DESCRIPTION

The Swirl Control Valve (SCV) position sensor is a non-contact type.
The position sensor measures the opening angle of the SCV. The sensor is reliable and accurate, as it is electrically controlled by Hall elements.
The ECM's IACI terminal voltage increases in correlation with the opening angle of the SCV. When the SCV is fully closed, approximately 0.6 V is applied to the IACI terminal. When the SCV is fully open, approximately 3.6 V is applied to the IACI terminal.
When the output voltage of the IACI terminal deviates from the standard range, the ECM determines that a malfunction has occurred in the position sensor and outputs a DTC.
A076830E02
DTC No.
 DTC Detection Condition
 Trouble Area
P2014
 SCV position sensor output voltage flutters up and down beyond the normal operating range
(Less than 0.2 V or more than 4.8 V for more than 0.5 seconds)
(Open or short)
  1. Open or short in SCV position sensor circuit
  2. SCV position sensor
  3. ECM
P2016
 SCV position sensor output voltage is less than 0.2 V for more than 0.5 seconds (Short)
 Same as DTC No. P2014
P2017
 SCV position sensor output voltage is more than 4.8 V for more than 0.5 seconds (Open)
 Same as DTC No. P2014

HINT:
After confirming DTC P2014, P2016 or P2017, use the intelligent tester to confirm the SCV Angle Sensor (D4) (SCV position sensor output voltage) from Power train / Engine / Data List.

SCV ANG SENS D4
 Malfunction
0.2 V or less
  1. IACI circuit short
  2. VC2 circuit open
4.8 V or more
  1. VC2 and IACI circuit short-circuited
  2. IACI circuit open
  3. E3 circuit open

WIRING DIAGRAM

A107195E05

INSPECTION PROCEDURE

HINT:
  1. If different DTCs that are related to a different system are output simultaneously while terminal E3 is used as a ground terminal, terminal E3 may be open.
  2. Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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 (Click here).


1. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (OPERATE SCV)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the engine switch on (IG) and turn the tester ON.

  1. Enter the following menus: Power train / Engine / Active Test / Control the SCV Duty Ratio.

  1. Scroll the data list by the up or down button to display SCV ANG SENS D4 (SCV position sensor).

  1. Check the output voltage of SCV ANG SENS D4 while the DC motor for SCV is driven from full closed to full open (or from full open to full closed) using the intelligent tester.

    Standard:
    The voltage output of SCV POSITION remains between 0.2 to 4.8 V while the DC motor for SCV is driven from -100 to 100 % (or from 100 to -100 %).
    SCV DUTY RATIO
    operation
    		 SCV ANG SENS D4
    (Normal)
    		 Suspect failure area
    1. IACI circuit short
    2. VC2 circuit open
    1. VC2 and IACI circuit short-circuited
    2. IACI circuit open
    3. E3 circuit open
    		 Sensor malfunction
    -100 %
    		 0.2 to 1.0 V
    		 Remain less than 0.2 V
    		 Remain more than 4.8 V
    		 Sensor malfunction
    100 %
    		 3.2 to 4.8 V
    		 Remain less than 0.2 V
    		 Remain more than 4.8 V



OK
Go to step 5
NG


2. CHECK HARNESS AND CONNECTOR (SCV POSITION SENSOR - ECM)

  1. A122775E01
    Disconnect the E3 and E6 ECM connectors.

  1. Disconnect the E56 SCV position sensor connector.

  1. Measure the resistance of the wire harness side connector.

    Standard resistance (Check for open):
    Tester Connection
    		 Specified Condition
    VC (E3-29) - VCX (E56-1)
    		 Below 1 Ω
    IAC1 (E6-31) - VSX (E56-3)
    		 Below 1 Ω
    E2 (E3-28) - E2X (E56-2)
    		 Below 1 Ω

    Standard resistance (Check for short):
    Tester Connection
    		 Specified Condition
    VC (E3-29) or VCX (E56-1) - Body ground
    		 10 kΩ or higher
    IAC1 (E6-31) or VSX (E56-3) - Body ground
    		 10 kΩ or higher
    E2 (E3-28) or E2X (E56-2) - Body ground
    		 10 kΩ or higher

  1. Reconnect the SCV position sensor connector.

  1. Reconnect the ECM connector.



 NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3. INSPECT ECM (VC2 VOLTAGE)

  1. A126135E09
    Disconnect the E56 SCV position sensor connector.

  1. Turn the engine switch on (IG).

  1. Measure the voltage of the E3 snf E6 ECM connector.

    Standard voltage:
    Tester Connection
    		 Specified Condition
    VC (E3-29) - E2 (E3-28)
    		 4.5 to 5.0 V

  1. Reconnect the SCV position sensor connector.



 NG
REPLACE ECM
OK


4. REPLACE INTAKE MANIFOLD

NEXT


5. CHECK WHETHER DTC OUTPUT RECURS (DTC P2014, P2016 AND/OR P2017 ARE OUTPUT AGAIN)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the engine switch on (IG) and turn the tester ON.

  1. Clear DTCs.

  1. Enter the following menus: Power train / Engine / DTC.

  1. Read DTCs.

    Result:
    Display (DTC Output)
    		 Proceed to
    P2014, P2016 and/or P2017 are output again
    		 A
    No output
    		 B



B
SYSTEM IS OK
A

REPLACE ECM


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