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11-20-2013, 09:09 AM | #1 |
Drives: 2006 Yaris 1.3 Join Date: Nov 2013
Location: England
Posts: 4
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Auto problem
Hi everyone,
I have a 2006 Yaris with auto transmission. I've had a problem with the gear selection which has got worse and worse. The car is very jerky to drive, when I press the accelerator the car pauses and then decides to engage and move forward. This pause has got longer over a year. It's now at the point where it's a bit dangerous ie pulling out at junctions. Because of the unreliable/unpredictable nature of the gear selection it's quite a jerky ride when in the lower gears as it surges forward once selecting. I really don't know where to start with it, never had an auto before. |
11-20-2013, 09:29 AM | #2 |
Embracing Curves
Drives: '14 Prius Executive Join Date: Aug 2013
Location: mid-western Germany
Posts: 256
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I'd recommend to buy a Toyota-specific scan tool ("MINI-VCI"), which can be had for 20...50$ in china.
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11-20-2013, 09:39 AM | #3 |
Drives: 06 Polar White 5dr, 13 Soul 4u Join Date: Oct 2008
Location: Georgetown, Ontario, Canada
Posts: 5,740
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How many KMs on the vehicle?
Have you checked the transmission fluid level? Has transmission fluid ever been changed?
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11-20-2013, 09:48 AM | #4 |
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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You don't have to "select" gears while driving auto.. you put it in "D", and drive away.. and normally just leave it there until you need to park or go in reverse.
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11-20-2013, 10:12 AM | #5 |
Drives: 2006 Yaris 1.3 Join Date: Nov 2013
Location: England
Posts: 4
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I mean the car 'selects'/puts the car in to a gear, not me.
It's done about 60,000 miles (96,000km?) and never had the trans fluid changed. |
11-20-2013, 10:18 AM | #6 |
toyota
Drives: 2007 Yaris RS Blazed Join Date: Oct 2006
Location: toronto, canada
Posts: 3,637
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now thats automatic.. really you dont have to shift the gear from P to D?
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If my calculations are correct, when this baby hits eighty-eight miles per hour... you're gonna see some serious shit!!!!!! "Horsepower is how fast you hit the object. Torque is how far you move that object.." |
11-20-2013, 10:19 AM | #7 |
ULTIMATE
Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008
Location: USA, CT
Posts: 13,460
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I am confused as to which transmission you have. The EPC does not show any automatics being paired with the 1.3L engine for either French or Japanese made 2006 Yaris.
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11-20-2013, 10:28 AM | #8 |
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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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Ah, I see it now. You have the C551A MMT (multi mode transmission):
"The multi-mode manual transmission has been developed from the conventional manual transmission by adding actuators that are directly controlled by electric motors. The transmission control system consists of an electronic throttle control system, clutch actuator, shift and select actuator, sensors, a shift lever, and a transmission control ECU. The system offers automatic clutch operation and two driving modes: automatic shifting E mode and manual shifting M mode"
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11-20-2013, 10:32 AM | #9 |
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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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You can grab the service manual for your transmission from the Micro Image forum:
http://www.microimageonline.com/down...0TRANSAXLE.pdf There is a calibration procedure that may help (and that can be done without the Toyota Intelligent Tester). Page 74 shows your current issue and all of these as potential causes: 1. Transmission unit (Gears, bearings, shift fork, synchronizer ring, shift key, etc.) 2. Clutch disc (Clutch cover) 3. Clutch stroke sensor 4. Clutch actuator assembly 5. Shift stroke sensor 6. Select stroke sensor 7. Shift and select actuator 8. Shift lever position sensor 9. Shift lock solenoid circuit 10. Shift lever assembly 11. Speed signal circuit 12. Transmission control ECU
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11-20-2013, 11:23 AM | #10 |
Drives: 2006 Yaris 1.3 Join Date: Nov 2013
Location: England
Posts: 4
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Sorry folks, yeah it has the auto bit (Where I can put in R, E or N) then you can slide the gear stick to the right and there is a plus and minus sign to change gear yourself.
The exact model is a T-Spirit and yes it is MMT (always wondered what that stood for!) Thanks for all that info, so it could be a number of things, great haha bloody cars! |
11-20-2013, 11:51 AM | #11 | |
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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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Quote:
I never really looked into how exactly the MMT worked before. It takes a nice simple manual transmission (the C51 that is is based on) and makes it about as complicated as can be.
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11-20-2013, 12:20 PM | #12 |
Drives: 2006 Yaris 1.3 Join Date: Nov 2013
Location: England
Posts: 4
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Sounds very much like that haha
I didn't think you'd have Yaris' over in the US, bit small for you guys aren't they?! |
11-20-2013, 12:52 PM | #13 |
ULTIMATE
Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008
Location: USA, CT
Posts: 13,460
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There are actually many of us with them here, but we are definitely a minority. This morning at Starbucks I was parked between a Hummer H1 and 3 mile long Ford Expedition.
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11-20-2013, 02:19 PM | #14 |
Embracing Curves
Drives: '14 Prius Executive Join Date: Aug 2013
Location: mid-western Germany
Posts: 256
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I've read the MMT would have a quite dumb algorithm.
One of the reasons I like manual transmission best. (and dual-clutch-transmission is bad, too: I often jump a gear) |
11-20-2013, 03:07 PM | #15 | |
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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Quote:
Yours may or may not have a problem, but after i got used to the smart, it's quite a blast to drive the MMT. |
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