7071557

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?

▶ Go to next step as below.

▶ Check that the crankshaft and camshaft are correctly aligned the matching marks of the pulleys for the followings.

•

Alignment of the timing belt

•

Alignment of the camshaft timing chain

Readjust or repair as necessary and go to "Verification of Vehicle Repair" procedure.

2.

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 :

Test Condition	Disconnect OCV connector	Apply battery voltage
Normal Value	Normal engine speed	Rough idle or engine stall

(5)

Has a problem been found?

	▶ Go to next step as below.
	▶ Go to "Check CVVT(Continuously Variable Valve Timing) Assembly" procedure.

3.

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?

	▶ Clean or replace as necessary and then go to "Verification of Vehicle Repair" procedure.
	▶ Go to next step as below.

(5)

Apply 12V and a ground to 2 and 1 terminals 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?

	▶ Go to "Check CVVT Assembly" procedure.
	▶ Check OCV for contamination, deterioration, or damage. Substitute with a known-good OCV and check for proper operation. If the problem is corrected, replace OCV and then go to "Verification of Vehicle Repair" procedure.

4.

Remove the CVVT assembly. Refer to "Removal Procedure" in Workshop Manual.

5.

Check that the CVVT assembly is locked.

6.

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.

7.

To release the CVVT lock pin, wrap some tape around the tip of an air pressure adapter and apply low air pressure of approx. 150kPa(1.5kg/㎠, 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.

8.

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.

9.

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˚)

10.

Turn the CVVT by hand and make sure it locks in the maximum delay angle position.

11.

Is CVVT assembly working properly?

	▶ Operate engine to check for DTC resetting. If okay, go to "Verification of Vehicle Repair" procedure.
	▶ Replace the CVVT assembly and go to "Verification of Vehicle Repair" procedure.