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10-04-2015, 10:03 AM | #1 |
Drives: Toyota Vitz (Yaris) Join Date: Nov 2011
Location: Lahore, Pakistan
Posts: 12
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Bad Alternator or Battery??
Hello Guys! I own a Toyota Vitz (Yaris) 1KR-FE (CVT). From past few days i am facing problems like dimming lights, vibration when AC or headlights turn on. To diagnose this i checked my battery(approx 2 year old) voltage and DMM was showing about 12.2V. I replaced the battery with new AC Delco sealed maintenance free battery. After changing the battery i am facing these issues.
The engine would crank in the morning and if i turn off and crank again. It would start. But if i drive like 5 6 KM with AC on and turn off the car and start again. The car would take a heavy start like the battery is dead. So i checked the voltage of battery at different instants and these are the results: Voltage when engine off: 13.08V Voltage when engine runs after cranking: 13.67V Voltage after 2 3 minutes of emgine running : 13.34V Increasing RPM to 2000~2500 voltage after 4 5 minutes of engine running: 13.7V Turning AC and headlights on @ idle:13.15V and @2000~2500 rpm: 13.28V I am just confused is the alternator weak or battery is bad(AC Delco is a reputed brand and also the hydrometer on the battery is green which means OK). Any suggestions??? |
10-04-2015, 10:25 AM | #2 |
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Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008
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It looks like your new battery and alternator are fine. If it is a second generation Vitz (2005-2011), then the problem may be that you need to clean the throttle body. When you disconnect the battery the ECM loses its short term data and if there are deposits of carbon in the throttle body, then the idle gets off a bit, making the car run a bit rough when starting.
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10-04-2015, 11:02 AM | #3 |
Drives: Toyota Vitz (Yaris) Join Date: Nov 2011
Location: Lahore, Pakistan
Posts: 12
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Yes its a Second Generation Vitz. But the thing concerning me is that after driving for like 5 6 KM with AC on and then starting again, why the car take a heavy start?
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10-04-2015, 11:48 AM | #4 | |
Quote:
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10-04-2015, 01:47 PM | #5 |
Drives: Toyota Vitz (Yaris) Join Date: Nov 2011
Location: Lahore, Pakistan
Posts: 12
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Clean with what? Carburetor/Injector cleaner? Or clean cloth?
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10-04-2015, 02:52 PM | #6 |
10-07-2015, 08:36 AM | #7 |
Drives: Toyota Vitz (Yaris) Join Date: Nov 2011
Location: Lahore, Pakistan
Posts: 12
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Got the throttle body cleaned. Problem is still there. I think startor motor is faulty??
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10-07-2015, 12:52 PM | #8 |
Drives: Toyota Vitz (Yaris) Join Date: Nov 2011
Location: Lahore, Pakistan
Posts: 12
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Bump!
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10-07-2015, 06:32 PM | #9 |
Starter motor has nothing to do with drivibility it only starts your engine.
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10-07-2015, 09:21 PM | #10 |
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Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008
Location: USA, CT
Posts: 13,460
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Considering that battery voltages look good in various states, check the terminals of it to make sure they are not corroded and check the ground connections from the battery to the chassis and between the engine and the chassis.
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10-08-2015, 06:34 AM | #11 | |
Drives: Toyota Vitz (Yaris) Join Date: Nov 2011
Location: Lahore, Pakistan
Posts: 12
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Quote:
I checked the resistances between different points like Chasis and battery ground and engine and battery ground. Its like 0.1 or 0.2ohm. When i connect the DMM at first reading is like 10 12 ohm and it falls gradually to 0.1 or 0.2 ohm. What i suspect from these results is 1) Either cables ground and positve are weak when hot. This analogy is from the weak AC compressor clutch wire. The original AC wire used to trip the compressor so i installed a relay long time ago and it works like a charm. 2)Starter motor issue. 3) Alternator issue.(I will get a JDM alternator just for checking in the evening to check whether the problem gets eradicated) Another question: Where is the starter relay connected in Vitz(Yaris). Relay contacts might have worn. |
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10-08-2015, 07:34 AM | #12 |
Drives: Toyota Vitz (Yaris) Join Date: Nov 2011
Location: Lahore, Pakistan
Posts: 12
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LATEST DEVELOPMENT:
Being obsessed by the problem i opened the terrminals and found something. One of the fuse on positive terminal "ALT" was blown and some one had bypassed it on "Main" by connection of wire loop (2 to 3mm2). Is this can be the problem? I suspect ALT is alternator amps. |
10-08-2015, 08:28 PM | #13 | |
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Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008
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Posts: 13,460
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Quote:
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10-09-2015, 08:59 AM | #14 |
Drives: Toyota Vitz (Yaris) Join Date: Nov 2011
Location: Lahore, Pakistan
Posts: 12
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CT Scott i one thing more i have observed. When i start tha car the voltage at battery terminals is 13.89 or 14 Volts. However when the engine is hot (to temp that fan triggers) the voltage at terminals is 13.25 Volts and when i turn off the engine the battery voltage is 13.02. Now 13.25-13.02 = 0.23 Volt. Isn't its less. Same problem has been observed when alternator was temporarily replaced.
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10-09-2015, 07:14 PM | #15 | |
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Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008
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Posts: 13,460
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Quote:
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10-09-2015, 08:00 PM | #16 |
Think someone has OCD
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10-09-2015, 11:17 PM | #17 |
It's the illusion you see
Drives: 07 Yaris Sedan Aero Join Date: Oct 2006
Location: Brossard, QC
Posts: 3,888
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I read this thread again. You may be right.
My Yaris doesn't start the same when the car is warm vs when it sat over night. The Yaris should start even at 11v... It is very unlikely the .25v difference is going to cause issues. Sent from my A0001 using Tapatalk |
10-10-2015, 06:29 AM | #18 |
Drives: Toyota Vitz (Yaris) Join Date: Nov 2011
Location: Lahore, Pakistan
Posts: 12
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okay Guys the problem has been solved. The culprit was Starter Motor. Its bushes were worn and the armature was not intact between the bushes. Changed the bushes and its YOOOOO
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