Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus IS 350. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

RETARDED CAMSHAFT TIMING 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	P0014	P0015
Bank 2	P0024	P0025

If DTC P0014 or P0015 is displayed, check the bank 1 VVT system for exhaust camshaft circuit.
Bank 1 refers to the bank that includes cylinder No. 1.
If DTC P0024 or P0025 is displayed, check the bank 2 VVT system for exhaust camshaft circuit.
Bank 2 refers to the bank that does not include cylinder No. 1.
Read freeze frame data using 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 (See FREEZE FRAME DATA ).

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0014, P0015, P0024 OR P0025)

Connect Techstream to the DLC3.
Turn the engine switch on (IG) and turn the tester on.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

Read DTCs.

Result

RESULT REFERENCE CHART

Display (DTC output)	Proceed to
P0014, P0015, P0024 or P0025	A
P0014, P0015, P0024 or P0025 and other DTCs	B

HINT:

If any DTCs other than P0014, P0015, P0024 or P0025 are output, troubleshoot those DTCs first.

B: GO TO DTC CHART

A: Go to next step

PERFORM ACTIVE TEST BY TECHSTREAM (OPERATE OCV)

Connect Techstream to the DLC3.
Start the engine and turn the tester on.
Warm up the engine.
Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the VVT System (Bank 1).

Check the engine speed while operating the Oil Control Valve (OCV) using the tester.

TESTER OPERATION SPECIFIED CONDITION CHART

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

NG: Go to step 4

OK: Go to next step

CHECK WHETHER DTC OUTPUT RECURS (DTC P0014, P0015, P0024 OR P0025)
1. Connect Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the tester on.
3. Clear DTCs (See DTC CHECK / CLEAR ).
4. Start the engine and warm it up.
5. Switch the ECM from normal mode to check mode using the tester (See CHECK MODE PROCEDURE ).
6. Drive the vehicle for more than 10 minutes.
7. Read DTCs using the tester.
  OK:
  
  No DTC output.
NG: Go to step 4

OK: END
CHECK VALVE TIMING (CHECK FOR LOOSE AND JUMPED TEETH ON TIMING CHAIN)
1. Remove the cylinder head cover RH and LH.
2. Turn the crankshaft pulley, and align its groove with the timing mark "0" of the timing chain cover.
3. Check that the timing marks of the camshaft timing gears are aligned with the timing marks of the bearing cap as shown in the illustration.
  If not, turn the crankshaft 1 revolution (360°), then align the marks as above.
  
  OK:
  
  Timing marks on crankshaft timing gears are aligned as shown in the illustration.
4. Reinstall the cylinder head cover.
NG: ADJUST VALVE TIMING

OK: Go to next step
INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (OCV FOR EXHAUST CAMSHAFT)
1. Remove the OCV.
2. Measure the resistance between the terminals of the OCV.
  Standard resistance:
  
  6.9 to 7.9 Ω at 20°C (68°F)
3. Apply the positive battery voltage to terminal 1 and negative battery voltage to terminal 2. Check the valve operation.
  OK:
  
  Valve moves quickly.
4. Reinstall the OCV.
  
  Fig 2: Applying Positive Battery Voltage To Terminal 1 And Negative Battery Voltage To Terminal 2
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY

OK: Go to next step
INSPECT OIL CONTROL VALVE FILTER AND PIPE
1. Remove the oil pipe No. 1 or No. 2.
2. Remove the oil control valve filter.
3. Check that the filter and pipe are not clogged.
  OK:
  
  Filter is not clogged.
  
  Fig 3: Locating Oil Control Valve Filter And Pipes
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: CLEAN OIL CONTROL VALVE FILTER AND PIPE

OK: Go to next step
REPLACE EXHAUST CAMSHAFT
CHECK WHETHER DTC OUTPUT RECURS
1. Clear the DTCs.
  1. Operate Techstream, or disconnect the EFI and ETCS fuses more than 60 sec. to erase the codes.
2. Start the engine and warm up the engine.
3. Switch the ECM from normal mode to check mode using Techstream (See CHECK MODE PROCEDURE ).
4. Drive the vehicle for more than 10 minutes or more.
5. Read output DTCs using Techstream.
  OK:
  
  No DTC output.
  
  HINT:
  
  DTC P0014, P0015, P0024 or P0025 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, thus eliminating the source of the problem.
OK: SYSTEM IS OK

NG: REPLACE ECM