Mass air flow sensor replacement (variable valve timing)
I'm looking to replace my own mass airflow sensor on a '99 ES 300 w/ variable valve timing. I've been told it's a simple procedure, but I'm not auto saavy and would feel more comfortable getting a walk-through by someone experienced.
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Re: mass air flow sensor replacement (variable valve...
The MAF is on the Air Intake above the air filter box and screwed into the plastic tube heading toward the throttle body. It is the 2" by 2" plastic protrution from the air intake tube. There should be two philips screws holding this in. Remove the two screws and back the entire MAF out. There is a wire harness connected, unclip this to remove completely.
If you have money burning a hole in your pocket, go ahead and purchase another MAF for a few hundred clams, or you can spend about $10 and clean it. It's made out of titanium and I doubt it will fail in 10 years. But sometime it does happen.
Go to Lowes, or Home Depot and buy Electronic Cleaner in a spray can. If you look inside the sensor, there is a heated wire, and behind that is another wire which picks up the oxidized air.
Stick the tube which is attached to the electronics cleaner spray can into the cavity where these wires are seen. Continue to spray most of the can onto these wires to remove oxidation build up from the wires. Let it evaporate for a few minutes then hit it again.
Allow the assembly to evaporate complete for about an hour.
In the mean time, take some throttle body cleaner and spray out the throttle body with the valve open. Keep open to let it dry out quicker and clean up the black crud that come out.
Keep you air filter replaced.
Put everything back together and you should be good to go.
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hi no more sin, the camshafts have the variable valve timing, not the
air mass sensor which should be a black box at the end of the air
intake snorkel closest to the engine.
get it scanned by a technician to make sure you get the right
information as to where to start.
No. The metal flap in the mass aiflow sensor is not connected to the throttle control. The air moving through the mass airflow sensor moves the flap. The flap works a variable resistor inside the mass airflow sensor. The more (and faster) the air is that moves through the sensor, the farther the flap will move...that is how it measures how much air is entering the engine....that is what a mass airflow sensor does.
A bad mass airflow sensor can cause all kinds of fuel control problems that can range anywhere from a hesitation on acceleration to a complete engine no-start condition.
DTC P1512 - VARIABLE TUMBLE CONTROL SYSTEM (VTCS), STUCK CLOSED The air intake hose that goes from the air filter/mass airflow sensor to the throttle body they are common to crack. This air leak can cause a lean condition if that checks out ok then the issue is usually a faulty mass air flow sensor .This would need to be checked next.
Usually the actuator valve is stuck closed. These are the most common causes of the P1512 and possible causes are: * ECT sensor malfunction. *
MAF sensor malfunction. * IAT sensor malfunction. * EGR boost sensor
malfunction * TP sensor malfunction. * CKP sensor malfunction * VTCS
solenoid valve malfunction. * VTCS shutter valve stuck closed. * VTCS
shutter valve actuator stuck closed. * Short circuit between PCM and
VCTS solenoid valve. * PCM malfunction.
I would start with the mass air
flow sensor this can cause all these issues. Then the cat. This would be
the next step.
I hope this helped (remember to rate and comment this answer).
the dtc doesnt make sense. there should be a P0 or C0 in front of it. I'm going to assume that it was P0171 and P0172. mainly because those are related to the MAF relatively. Take it back to the mechanic who did the work. it sounds to me like he did something wrong.