Inspection Procedure

HINT.

• If DTC P0010 is displayed, check the bank 1 VVT system circuit.
• Bank 1 refers to the bank that includes cylinder No. 1.
• If DTC P0020 is displayed, check the bank 2 VVT system circuit.
• Bank 2 refers to the bank that does not include cylinder No. 1.
• Read freeze frame data using a Techstream. 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. PERFORM ACTIVE TEST BY TECHSTREAM (OCV OPERATION) 
   1. Connect the Techstream to the DLC3.
   2. Start the engine and warm it up.
   3. Turn the ignition switch ON and turn the tester ON.
   4. Enter the following menus: Powertrain/Engine and ECT/Active Test/Control the VVT System (Bank 1) or Control the VVT System (Bank 2).
   5. Operate the Oil Control Valve (OCV) and check the engine condition at idling.

      OK 

      TESTER OPERATION AND SPECIFIED CONDITION
      
      

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

   OK: CHECK FOR INTERMITTENT PROBLEMS 

   NG: Go to next step 

2. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (OPERATION) 
   1. Disconnect the C19 or C20 OCV connector.
   2. Apply battery voltage to the terminals of the OCV.
   3. Check the engine speed.

      OK: Rough idle or engine stalled. 

   4. Reconnect the OCV connector.

   NG: REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY 

   Fig 1: Inspecting Camshaft Timing Oil Control Valve Assembly (Operation)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: Go to next step 

3. CHECK ECM (OCV SIGNAL) 
   1. Inspect the ECM using an oscilloscope
   2. While idling the engine, check the waveform of the E7 ECM connector using an oscilloscope.

      Standard voltage 

      STANDARD VOLTAGE
      
      

      Tester Connection	Specified Condition
      OC1+ (E7-17) - OC1- (E7-16)	Correct waveform is as shown
      OC2+ (E7-15) - OC2- (E7-14)

   NG: REPLACE ECM 

   Fig 2: Checking ECM (OCV Signal)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: Go to next step 

4. CHECK HARNESS AND CONNECTOR (OCV - ECM) 
   1. Disconnect the C19 or C20 OCV connector.
   2. Disconnect the E7 ECM connector.
   3. Measure the resistance between the wire harness side connectors.

      Standard resistance (Check for open) 

      STANDARD RESISTANCE
      
      

      Tester Connection	Specified condition
      OCV (C19-1) - OC1+ (E7-17)	Below 1 Ω
      OCV (C19-2) - OC1- (E7-16)
      OCV (C20-1) - OC2+ (E7-15)
      OCV (C20-2) - OC2- (E7-14)

      Standard resistance (Check for short) 

      STANDARD RESISTANCE
      
      

      Tester Connection	Specified condition
      OCV (C19-1) or OC1+ (E7-17) - Body ground	10 kΩ or higher
      OCV (C19-2) or OC1- (E7-16) - Body ground
      OCV (C20-1) or OC2+ (E7-15) - Body ground
      OCV (C20-2) or OC2- (E7-14) - Body ground

      Fig 3: Checking Harness And Connector (OCV - ECM)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   4. Reconnect the OCV connector.
   5. Reconnect the ECM connector.

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: CHECK FOR INTERMITTENT PROBLEMS