PCM monitors the camshaft position when VVT is functioning. normally when the engine is
running at 2000 to 3000 rpm PCM will activate the VVT by sending the activation command to the VVT
solenoid which sometimes is called the oil control valve or OCV. so when OCV
is activated but there is not any change on camshaft position PCM will set a fault code
P0024. fault code will be set if the difference between bank two exhaust camshafts
actual position and desired position is more than 20 degrees to diagnose the engine in this case the
following items must be checked: engine oil, bank 2 exhaust VVT solenoid, and bank 2 exhaust VVT .
Engine oil. as variable valve timing works with the engine oil you must check what was
the last engine oil change check the oil level and quality and replace it if needed
You can see the passages into the VVT from the engine block into the VVT oil filter
then OCV. many engines with VVT mechanism
have got a filter right before OCV so locate that filter remove it and clean it thoroughly
as this fault code is set for the bank 2 exhaust side
locate the relevant OCV to perform the test procedure
before doing anything it is very important to review OCV wiring diagram. as soon as you turn
the ignition switch to on position power supply will be provided to OCV via engine main relay.
so you must have battery voltage on that pin.
also OCV is controlled by PCM using the other wire so the control line must be checked too...
for testing the OCV power supply voltage, turn the ignition on when bank 2 exhaust OCV
connector is disconnected, then check the supply voltage using a multimeter on the relevant pin.
in this test you must measure the battery voltage on the multimeter
locate the exhaust OCV bank 2 and perform the power supply test procedure as shown here
remove the OCV connector then start the engine. apply battery positive and negative
to OCV when engine is running. if solenoid is functioning engine must hesitate or stall.
so if after activating the solenoid in this test you do not see any changes in engine operation
it means that OCV might be faulty so you must remove the OCV to do more tests...
You can also test the VVT operation by the scan tool. use the actuator test in the scan
tool and activate the bank 2 exhaust OCV as shown in this video if engine
hesitates it means solenoid is functioning otherwise remove the OCV to do more tests
remove the bank to exhaust OCV clean it carefully and check the solenoid visually
for testing the solenoid off the engine you can perform the actuation test
so provide the battery positive and negative on the OCV
and test it as shown here make sure you hear the clicking sound during the actuation test
next step is to measure the OCV internal resistance using a multimeter. measure the
resistance as shown in the video and compare it with the specification. if OCV fails in any of
these two tests you must replace it with a brand new one otherwise if OCV is good and you still
have the fault you should go to the next step to test the VVT itself. for testing the intake VVT
remove the bank 2 exhaust camshaft and locate the advanced and retard oil passages on camshaft...
test the exhaust VVT by providing the compressed air into the relevant oil galleries.
for testing the exhaust VVT when you provide the air into the retard oil gallery,
VVT should rotate as exhaust VVT is locked at maximum advance.
before providing the compressed air into the retard oil gallery make sure that
the VVT is locked and does not rotate. if VVT fails this test it must be replaced...