Inspection Procedure

1. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (OCV OPERATION) 
   1. Connect the intelligent tester to the DLC3.
   2. Turn the ignition switch ON and turn the tester ON.
   3. Warm up the engine.
   4. On the tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / VVT CTRL B1 or VVT CTRL B2.
   5. Using the intelligent tester, operate the OCV and check the engine speed.

   OK : Go to next step 

   OCV OPERATION
   
   

   Tester Operation	Specified Condition
   OCV OFF	Normal engine speed
   OCV ON	Rough idle or engine stall

   OK : CHECK FOR INTERMITTENT PROBLEMS 

   NG : Go to next step 

2. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (OCV) 
   1. Reconnect the OCV connector.

   OK : 

   OCV has no contamination and moves smoothly. 

   NG : REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY 

   OK : Go to next step 

3. INSPECT ECM (OCV SIGNAL) 
   1. During idling, check the waveform of the ECM connector using an oscilloscope.

   Signal waveform 

   ECM (OCV SIGNAL)
   
   

   Tester Connection	Specified Condition
   E7-16 (OC1+) - E7-15 (OC1-) E7-14 (OC2+) - E7-13 (OC2-)	Correct waveform is shown in the illustration.

   Fig 1: Inspecting ECM (OCV Signal)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG : REPLACE ECM 

   OK : Go to next step 

4. CHECK HARNESS AND CONNECTOR (OCV - ECM) 
   1. Disconnect the V6 or V7 OCV connector.
   2. Disconnect the E7 ECM connector.
   3. Measure the resistance of the wire harness side connectors.

   Standard resistance 

   OCV - ECM
   
   

   Tester Connection	Specified Condition
   V7-1 (OCV) - E7-16 (OC1+) V7-2 (OCV) - E7-15 (OC1-) V6-1 (OCV) - E7-14 (OC2+) V6-2 (OCV) - E7-13 (OC2-)	Below 1 Ω
   V7-1 (OCV) or E7-16 (OC1+) - Body ground V7-2 (OCV) or E7-15 (OC1-) - Body ground V6-1 (OCV) or E7-14 (OC2+) - Body ground V6-2 (OCV) or E7-13 (OC2-) - Body ground	10 kΩor higher

   Fig 2: Checking Harness And Connector (OCV - ECM)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK : CHECK FOR INTERMITTENT PROBLEMS 

1. CHECK CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (OCV OPERATION) 
   1. Disconnect the V6 or V7 OCV connector.
   2. Apply positive battery voltage between the terminals of the OCV.
   3. Check the engine speed.
   Fig 3: Checking Camshaft Timing Oil Control Valve Assembly (OCV Operation)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK : 

   Engine speed is rough idle or engine is stalled. 

   NG : REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY 

   OK : Go to next step 

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

   Signal waveform 

   ECM (OCV SIGNAL)
   
   

   Tester Connection	Specified Condition
   E7-16 (OC1+) - E7-15 (OC1-) E7-14 (OC2+) - E7-13 (OC2-)	Correct waveform is shown in the illustration

   Fig 4: Checking ECM (OCV Signal)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG : REPLACE ECM 

   OK : Go to next step 

3. CHECK HARNESS AND CONNECTOR (OCV - ECM) 

1. Disconnect the V6 or V7 OCV connector.
2. Disconnect the E7 ECM connector.
3. Measure the resistance of the wire harness side connectors.

Standard resistance 

Fig 5: Checking Harness And Connector (OCV - ECM)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK : CHECK FOR INTERMITTENT PROBLEMS