Question about 2001 Toyota Sienna

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When the car is driven consistently with air conditioner, daytime running lights/headlights, car stereo,e.t.c. on especially standing for long periods in stagnant traffic, the battery gradually loses power and may not be able to start up the car. i noticed that in the evenings while idling at 600 rpm on drive gear, the headlights and dashboard lights get brighter when you throttle softly up to 900 - 1000 rpm. The rpm falls by about 200rpm when put on gear or steering turned fully or the a/c compressor comes on. The auto electrician changed the alternator to a fairly used one but the result is still the same. Can the failure of the rpm vacuum compensation system be the problem. Note that the radiator carries two big fans which are constantly on with ignition because of the cooling needs in the tropics where we live. How can the vacuum rpm system be fixed? I saw idling control sensor fault. during a technician's DTC assay on the car. Is this relevant?

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As to the first issue of looseing power, the charging system should be checked for proper output & a draw test on the battery. The battery should be able to sustain a high draw for a while unless it's either weak or it's not being fully recharged by the alternator.
On the second issue, the idle control sensor is the item that will bring the RPMs up to proper levels when idling, you should replaced this first before doing anything else on this system.

Posted on Apr 07, 2011

Testimonial: "thanks a million! ur answer is very helpful. how do i find out if my charging is ok? bad alternator or bad earthing or rpm too low? "

  • jayberry2 Apr 08, 2011

    You need specisl test equipment to check the eletrical and battery system properly, any good repair shop should have this equipment on hand.

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