Inspection Procedure

HINT:

• If DTC P0013 is displayed, check the right bank VVT system for exhaust camshaft circuit.
• If DTC P0023 is displayed, check the left bank VVT system for exhaust camshaft circuit.
• 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. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (OPERATE OCV) 
   1. Connect the intelligent tester to the DLC3.
   2. Start the engine and warm it up.
   3. Select the following menu items on the tester: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / VVT EX B1 or VVT EX B2.
   4. Check the engine speed while operating the Oil Control Valve (OCV) using the tester.

      Standard 

      TESTER CONNECTION AND SPECIFIED CONDITION
      
      

      Tester Operations	Specified Conditions
      OCV OFF	Normal engine idle 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. Disconnect the B43 or B20 OCV connector.
      Fig 1: Identifying B43 or B20 OCV Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. While idling, check the waveform between the terminals of the B43 or B20 OCV connector using an oscilloscope.

      OK: Go to Next Step 

      TESTER CONNECTION AND SPECIFIED CONDITION
      
      

      Tester Connections	Specified Conditions
      + (B43-1) - - (B43-2)	Correct waveform appears
      + (B20-1) - - (B20-2)	Correct waveform appears

   3. Reconnect the OCV connector.

   NG: Go to step 3 

   OK: REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY 

3. CHECK ECM (OCV SIGNAL) 
   1. Inspect the ECM using an oscilloscope.
   2. While idling, check the waveform between the terminals of the B47 ECM connector.

      OK: Go to Next Step 

      TESTER CONNECTION AND SPECIFIED CONDITION
      
      

      Tester Connections	Specified Conditions
      OE1+ (B47-26) - OE1- (B47-31)	Correct waveform appears
      OE2+ (B47-27) - OE2- (B47-32)	Correct waveform appears

   NG: Go to step 4 

   Fig 2: Checking Waveform Between Terminals Of B47 ECM Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: REPAIR OR REPLACE HARNESS OR CONNECTOR 

4. CHECK HARNESS AND CONNECTOR (OCV SIGNAL SHORT CIRCUIT) 
   1. Disconnect the B43 or B20 OCV connector.
   2. Disconnect the B47 ECM connector.
   3. Measure the resistance between the wire harness side connectors.

      Standard resistance (Check for short) 

      TESTER CONNECTION AND SPECIFIED CONDITION
      
      

      Tester Connections	Specified Conditions
      OE1+ (B47-26) - E1 (B47-1)	10 k or higher
      OE1- (B47-31) - E1 (B47-1)	10 k or higher
      OE2+ (B47-27) - E1 (B47-1)	10 k or higher
      OE2- (B47-32) - E1 (B47-1)	10 k or higher

      Fig 3: Identifying B47 ECM Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: REPLACE ECM