Component Inspection

Component Inspection

1. Timing Inspection
(1) With ignition "OFF", set up an oscilloscope as follows :
Channel A (+) : Signal terminal of the CMPS#1 (back probe), (-) : ground
Channel B (+) : Signal terminal of the CKPS (back probe), (-) : ground
(2) Start the engine and check for signal waveform whether synchronize with camshaft sensor or not and tooth is missing refer to sample waveforms as below




1 There are 60 signals of CKPS (Including missing tooth) during the semi-cycle of CMPS.
2 There are 3 - 5 signals of CKPS between the switching point of CMPS and the missing tooth of CKPS.
(3) Is the signal waveform normal?





Check OCV and Filter
1. Check operation of OCV
(1) Ignition "OFF"
(2) Disconnect intake OCV connector.
(3) Start the engine and let it idle.
(4) With OCV connector still disconnected, apply 12V to power terminal and connect ground to control terminal of the OCV (Component side).
Specification :





(5) Has a problem been found?





2. Check OCV and Filter
(1) Ignition"OFF"
(2) Check OCV filter for sticking or contamination.
(3) Remove the OCV and visually check the spool column of OCV for contamination
(4) Has a problem been found?





(5) Apply 12V to power terminal and connect ground to control terminal of the OCV (Component side).
(6) Verify that a "clicking" sound is heard when applying the battery voltage.
(7) Repeat this procedure 4 or 5 times to ensure intake OCV reliability.




(8) Is OCV working properly?





Check CVVT (Continuously Variable Valve Timing) Assembly
1. Remove the CVVT assembly.
2. Check that the CVVT assembly is locked.
3. The one of the 2 holes on the cam journal is for advances (upper) and the rest is for retards (lower). Apply masking tape to all oil path holes except the one advance hole ("B") indicated by the arrow as shown in the figure.




4. To release the CVVT lock pin, wrap some tape around the tip of an air pressure adapter and apply low air pressure of approx. 150 kPa (1.5 kg/cm2, 21 psi) to the exposed camshaft port. Wrap a shop towel or rag around the CVVT because residual oil may leak out of the unit when applying air pressure
5. With low air pressure applied, turn the CVVT to the ADVANCE direction as indicated in the figure.

NOTE:
If too much air leaks when applying the low air pressure, the CVVT lock pin may not release and the CVVT may not turn.




6. Allow the CVVT assembly to move in the ADVANCE and DELAY directions to ensure there is no binding and that it moves freely. (Movable smoothly in the range about 20°)
7. Turn the CVVT by hand and make sure it locks in the maximum delay angle position.
8. Is CVVT assembly working properly?