Lexus IS250 · Service Manual ENGINE

P0013

Diagnostic trouble codes

DESCRIPTION

The Variable Valve Timing (VVT) system includes the ECM, OCV and VVT controller. The ECM sends a target duty-cycle control signal to the OCV. This control signal regulates the oil pressure supplied to the VVT controller. Camshaft timing control is performed according to engine operating conditions such as the intake air volume, throttle valve position and engine coolant temperature. The ECM controls the OCV, based on the signals transmitted by several sensors. The VVT controller regulates the exhaust camshaft angle using oil pressure through the OCV. As a result, the relative positions of the camshaft and crankshaft are optimized, the engine torque and fuel economy improve, and the exhaust emissions decrease under overall driving conditions. The ECM detects the actual exhaust valve timing using signals from the camshaft and crankshaft position sensors, and performs feedback control. This is how the target intake valve timing is verified by the ECM.
A103843E02
DTC No.
 DTC Detection Condition
 Trouble Area
P0013
 Open or short in OCV for exhaust camshaft (bank 1) circuit
(1 trip detection logic)
  1. Open or short in OCV for exhaust camshaft (bank 1) circuit
  2. OCV for exhaust camshaft (bank 1)
  3. ECM
P0023
 Open or short in OCV for exhaust camshaft (bank 2) circuit
(1 trip detection logic)
  1. Open or short in OCV for exhaust camshaft (bank 2) circuit
  2. OCV for exhaust camshaft (bank 2)
  3. ECM

WIRING DIAGRAM

A086808E13

INSPECTION PROCEDURE

HINT:
  1. If DTC P0013 is displayed, check the bank 1 VVT system for exhaust camshaft circuit.
  2. Bank 1 refers to the bank that includes cylinder No. 1.
  3. If DTC P0023 is displayed, check the bank 2 VVT system for exhaust camshaft circuit.
  4. Bank 2 refers to the bank that does not include cylinder No. 1.
  5. Read freeze frame data using an 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 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 (Click here).


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

  1. Connect the intelligent tester to the DLC3.

  1. Start the engine and turn the tester ON.

  1. Warm up the engine.

  1. Enter the following menus: Power train / Engine / Active Test / Activate the VVT System (Bank 1) or Control the VVT System (Bank 2).

  1. Check the engine speed while operating the Oil Control Valve (OCV) using the tester.

    OK:
    Tester Operation
    		 Specified Condition
    OCV OFF
    		 Normal engine speed
    OCV ON
    		 Engine idles roughly or stalls (soon after OCV switched from OFF to ON)



NG
Go to step 2
OK

CHECK FOR INTERMITTENT PROBLEMS

2. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (OCV SIGNAL)

  1. A094633E34
    Disconnect the E21 or E31 OCV connector.

  1. While idling, check the waveform between the terminals of the E21 or E31 OCV connector using an oscilloscope.

    Standard:
    Tester Connection
    		 Specified Condition
    E21-1 (+) - E21-2 (-)
    		 Correct waveform shown
    E31-1 (+) - E31-2 (-)
    		 Correct waveform shown

  1. Reconnect the OCV connector.



 NG
Go to step 3
OK

REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY

3. INSPECT ECM (OCV SIGNAL)

  1. A107186E12
    Inspect the ECM using an oscilloscope.

  1. While idling, check the waveform between the terminals of the E3 or E5 OCV connector.

    Standard:
    Tester Connection
    		 Specified Condition
    OE1+ (E3-9) - OE1- (E3-8)
    		 Correct waveform shown
    OE2+ (E5-24) - OE2- (E5-23)
    		 Correct waveform shown



NG
REPLACE ECM
OK

REPAIR OR REPLACE HARNESS OR CONNECTOR


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