Inspection Procedure

HINT:

ADVANCED TIMING OVER REFERENCE

Abnormal bank	Advanced timing over (Valve timing is out of specified range)	Retarded timing over (Valve timing is out of specified range)
Bank 1	P0011	P0012
Bank 2	P0021	P0022

If DTC P0011 or P0012 is displayed, check the bank 1 Variable Valve Timing (VVT) system circuit.
If DTC P0021 or P0022 is displayed, check the bank 2 VVT system circuit.
Bank 1 includes No. 1 cylinder, but bank 2 does not. No. 1 cylinder is located in the front part of the engine, opposite the transmission.
Read freeze frame data using the 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.

PERFORM ACTIVE TEST BY TECHSTREAM (OCV OPERATION)

Connect the Techstream to the DLC3.
Start the engine and warm it up.
Enter the following menus: Powertrain/Engine and ECT/Active Test/Control the VVT System (Bank 1) or Control the VVT System (Bank 2).

Using the Techstream, operate the Oil Control Valve (OCV) and check the engine speed.

Standard

TESTER OPERATION AND SPECIFIED CONDITION

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

HINT:

DTC P0011, P0012, P0021 or P0022 is also output when a foreign object is detected in some parts of the system in the engine oil, and then the system returns to normal in a short time. As the ECM is controlled to eject a foreign object, there is no problem with the VVT. There is also no problem with the VVT as the oil filter should catch the foreign object in the engine oil.

OK: VVT SYSTEM OK

NG: Go to next step

CHECK VALVE TIMING (CHECK FOR LOOSE AND JUMPED TOOTH OF TIMING BELT)
1. Check the valve timing (See INSTALLATION ).
NG: ADJUST VALVE TIMING

OK: Go to next step
CHECK HARNESS AND CONNECTOR (OCV - ECM)
1. Inspect using an oscilloscope
2. During idling, check the waveform between the specified terminals of the E7 ECM connector.
  Standard:
  
  The correct waveform is as shown.
NG: REPLACE ECM

Fig 1: Checking Harness And Connector (OCV - ECM)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step
INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY
1. Remove the V-bank cover.
2. Remove the air cleaner inlet and intake air connector.
3. Disconnect the C19 and C20 Oil Control Valve (OCV) connectors.
4. Measure the resistance of the OCV
  Standard resistance:
  
  6.9 to 7.9 Ω at 20°C (68°F)
5. Reconnect the OCV connector.
6. Reinstall the air cleaner inlet and intake air connector.
7. Reinstall the V-bank cover.
  
  Fig 2: Inspecting Camshaft Timing Oil Control Valve Assembly
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY

OK: Go to next step
INSPECT CAMSHAFT TIMING GEAR ASSEMBLY
1. Remove the timing belt (See REMOVAL ).
2. Remove the cylinder head cover.
3. Remove the OCV.
4. Drain the oil in the VVT controller assembly.
5. Check whether the oil in VVT controller assembly is drained or not.
  Standard:
  
  The oil in VVT controller assembly is drained.
6. Reinstall the OCV.
7. Reinstall the cylinder head cover.
8. Reinstall the timing belt.
  
  Fig 3: Inspecting Camshaft Timing Gear Assembly
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK: Go to step 7

NG: Go to next step
REPLACE CAMSHAFT TIMING GEAR ASSEMBLY
INSPECT OIL CONTROL VALVE FILTER
1. Remove the cylinder head cover (See REMOVAL )
2. Remove the camshaft bearing cap and OCV filter.
3. Check that the filter is not clogged.
  OK: The filter is not clogged.
4. Reinstall the camshaft bearing cap and OCV filter.
5. Reinstall the cylinder head cover.
NG: CLEAN OIL CONTROL VALVE FILTER

Fig 4: Inspecting Oil Control Valve Filter
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step
CHECK WHETHER DTC OUTPUT RECURS (DTC P0011, P0012, P0021 OR P0022)
1. Connect the Techstream to the DLC3
2. Turn the ignition switch ON and turn the tester ON.
3. Clear the DTCs.
4. Start the engine and warm it up
5. Switch the ECM from normal mode to check mode using the tester.
6. Drive the vehicle for more than 10 minutes.
7. Read output DTCs using the tester.
  Standard:
  
  No DTC output.
  
  HINT.
  
  DTC P0011 or P0012 is output when foreign objects in engine oil are caught in some parts of the system. These codes will stay registered even if the system returns to normal after a short time. These foreign objects are then captured by the oil filter, thus eliminating the source of the problem.
OK: SYSTEM OK

NG: REPLACE ECM