OBD II scan tool (excluding hand-held tester):

CHECK VALVE TIMING (CHECK FOR LOOSE AND A JUMPED TOOTH OF TIMING BELT) (See TIMING BELT (3MZ-FE) )
NG: ADJUST VALVE TIMING (See TIMING BELT (3MZ-FE) )

OK: GO TO NEXT STEP.
CHECK OPERATION OF OCV

Fig 1: Identifying OCV Terminals (Components Side)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. Start the engine.
2. Check the engine speed with (1) and (2).
  1. Disconnect the V9 or V10 OCV connector.
  2. Apply the battery positive voltage between the terminals of the OCV.
    Result:
    
    Fig 2: OCV Check Result Table
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Reconnect the OCV connector.
B: Go to step 4

A: GO TO NEXT STEP.
CHECK IF DTC OUTPUT REOCCURS
1. Clear the DTCs.
  1. Disconnect the negative battery cable or remove the EFI and ETCS fuses for more than 60 seconds.
  NOTE: When disconnecting the battery cable, perform the "INITIALIZE" procedure (see PRECAUTION ).
2. Start and warm up the engine.
3. Drive the vehicle around for 10 minutes or more.
4. Read output DTC using the OBD II scan tool.
Standard: No DTC output.

HINT:

(*) DTC P0011, P0012, P0021 or P0022 is output when a foreign object in engine oil is caught in some part of the system. These codes will stay registered even if the system returns to normal after a short time. Foreign objects are filtered out by the oil filter.

OK: VVT SYSTEM OK (*)

NG: GO TO NEXT STEP.
INSPECT ECM (OCV SIGNAL)
1. Inspect using the oscilloscope.
2. During idling, check the waveform between the specified terminals of the E8 ECM connectors.
  Standard:
  
  Fig 3: ECM Connector Terminals Specified Condition Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 4: Identifying OCV Signal Waveform
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPLACE ECM (See ECM (3MZ-FE) )

OK: GO TO NEXT STEP.
CHECK OIL CONTROL VALVE FILTER
NG: REPLACE OIL CONTROL VALVE FILTER

OK: GO TO NEXT STEP.
INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSY (OCV) (See INSPECTION )
OK: Go to step 8

NG: GO TO NEXT STEP.
REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSY (OCV)
GO: GO TO NEXT STEP.
CHECK CAMSHAFT TIMING GEAR ASSY (See CAMSHAFT (RH BANK) (3MZ-FE) or CAMSHAFT (LH BANK) (3MZ-FE) )
OK: Go to step 10

NG: GO TO NEXT STEP.
REPLACE CAMSHAFT TIMING GEAR ASSY
GO: GO TO NEXT STEP.
CHECK FOR BLOCKAGE (OCV, OIL CHECK VALVE AND OIL HOLE)
NG: REPAIR OR REPLACE

OK: GO TO NEXT STEP.
CHECK IF DTC OUTPUT REOCCURS
1. Clear the DTCs.
  1. Disconnect the negative battery cable or remove the EFI and ETCS fuses for more than 60 seconds.
  NOTE: When disconnecting the battery cable, perform the "INITIALIZE" procedure (see PRECAUTION ).
2. Start and warm up the engine.
3. Drive the vehicle around for 10 minutes or more.
4. Read output DTC using the OBD II scan tool.
  Standard: No DTC output.
  
  HINT:
  
  DTC P0011, P0012, P0021 or P0022 is output when a foreign object in engine oil is caught in some of the system. These codes will stay registered even if the system returns to normal after a short time. Foreign objects are filtered out by the oil filter.
OK: VVT SYSTEM OK (*)

NG: REPLACE ECM (See ECM (3MZ-FE) )