Analysis on the recall of Yize／C-HR gearbox with possible power interruption
[car home Technology] On December 21st, FAW Toyota/GAC Toyota announced that there were quality problems in the hydraulic torque converter in CVT gearbox of (|)/C-HR model, and the oil circulation blade of the hydraulic torque converter was riveted badly. When the vehicle was subjected to repeated rapid acceleration and other operations, the blade might fall off, causing damage to the torque converter. In extreme cases, it might lead to power interruption while the vehicle was driving, posing a safety hazard. FAW Toyota/GAC Toyota will replace the qualified hydraulic torque converter and continuously variable transmission assembly for vehicles within the scope of recall free of charge to eliminate potential safety hazards.
"Screenshot of the recall announcement of the State Administration of Market Supervision"
"GAC Toyota C-HR/ FAW Toyota Yize IZOA』"
FAW Toyota will recall 10,442 IZOA models produced from September 14, 2018 to November 27, 2018; GAC Toyota will recall 9,454 C-HR models produced between September 13, 2018 and November 14, 2018. Since the CVT gearbox is standard in all the Izawa IZOA/C-HR models, all the Izawa IZOA/C-HR models produced within the above time are within the recall scope.
● Go straight to the place where the problem occurs.
According to the recall announcement, the problem is the hydraulic torque converter of CVT gearbox. Hydraulic torque converter exists in both AT and CVT gearboxes, and its function is to realize the soft connection between the engine output shaft and the gearbox input shaft, allowing the speed difference between the two shafts, realizing the semi-linkage state similar to that in manual gearboxes, and facilitating the gearbox to automatically shift gears.
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"Video of technical explanation of hydraulic torque converter"
The transmission of hydraulic torque converter depends on the internal blades. If the blades on the pump wheel, guide wheel or turbine fall off, the power from the engine will not be transmitted to the gearbox, which will cause the vehicle to lose power.
● TNGA-based Direct Shift CVT gearbox is so delicate?
The CVT gearbox mounted on Izawa IZOA/C-HR is the Direct Shift CVT gearbox under the Toyota TNGA architecture. There are some big differences between this gearbox and the general CVT gearbox in structure.
The gear ratio range of CVT gearbox mounted on Yize IZOA/C-HR reaches 7.5, which is higher than 7.0 of other CVT gearboxes with similar torque capacity. A higher transmission ratio range is beneficial to better balance the vehicle’s low-speed speed-up performance and fuel economy during high-speed cruising.
From a technical point of view, the design of this Direct Shift CVT gearbox to broaden the transmission range of the gearbox by increasing the starting gear transmission is quite innovative. According to Toyota’s development system, CVT gearboxes will be mass-produced. In the development stage and mass production stage, all kinds of rigorous durability tests are essential. The problem of this recall is more likely that the quality of parts suppliers is not up to requirements. At present, the CVT gearbox used by Yize IZOA/C-HR is imported from Japan, and we have not been able to obtain the information of the CVT gearbox hydraulic torque converter parts supplier. We will publish more information on the website as soon as possible.
● What will happen to the car when it breaks down?
The recall information simply describes the problem, but does not specify the phenomenon when the fault occurs. I checked the posts of netizens on car home Yize IZOA Forum. On December 16th, a netizen reported that the engine stopped immediately after Yize IZOA was parked in D gear, and the vehicle could not start, and the vehicle could not reverse when it was parked in R gear. Later, the netizen’s car was tested in a 4S shop, and the gearbox needed to be replaced, but it took one month for the gearbox to adjust the goods (click to view the forum post).
When the CVT gearbox of Yize IZOA breaks down, the torque converter loses its power transmission ability, and the vehicle will lose power. If the vehicle breaks down at the start, the vehicle can’t start, which generally has little impact on the safety of users. The trailer can be handled at the 4S shop. It is much more complicated if the internal blades of the hydraulic torque converter break in the CVT gearbox during the start-up of Yize IZOA. However, because the gearbox is equipped with input shaft speed sensor and output shaft speed sensor, and the engine is equipped with crankshaft speed sensor, when the transmission of hydraulic torque converter fails, ECU can recognize it by the above speed signal, and at this time, some protective measures will be taken. I guess the system will put the gearbox into neutral and the vehicle will lose power to slide. At this time, the user can stop the vehicle by hitting the direction and braking the pedal, and then can call the trailer to be towed back to the 4S shop for treatment.
● I am the owner of Izawa IZOA/C-HR. What should I do?
Since the manufacturer only started to recall from February 22, 2019, this means that there are still 2 months. What should I do as the owner of Izawa IZOA/C-HR?
If the gearbox of your vehicle has been damaged and the vehicle loses power, then you can only ask the trailer to tow the car back to the 4S shop for repair. Therefore, the problem of this recall caused the vehicle to break down, and the user was not responsible for the trailer fee.According to the information we have obtained at present, it takes about 10 hours to replace the gearbox, during which the manufacturer will provide a scooter or transportation subsidy.
● The gearbox with problems is not specially supplied by China.
This CVT gearbox matched with Toyota 2.0L naturally aspirated engine is not the only problem in China. The CVT gearbox of the new Corolla 2.0L model listed in North America, Oceania and Taiwan, China has also been recalled. In the recall announcement, it is stated that only the models with the specified production batch need to be recalled, and the remaining models have not been included in the recall list yet. Considering that the gearbox of Yize IZOA/C-HR is imported, this type of gearbox recalled by Toyota in the world is likely to come from the same faulty production line or use the same batch of faulty hydraulic torque converter parts.
● Summary:
According to the posts of users in car home Yize IZOA/C-HR Forum, there is no large-scale gearbox damage in these two cars, and consumers who have bought these two models need not panic excessively. The practice of recalling without large-scale failure reflects from one aspect that FAW Toyota/GAC Toyota are more responsible and sincere towards consumers. We also hope that manufacturers can nip potential problems in the bud through recall. We will continue to pay attention to the subsequent recall of Yize IZOA/C-HR. Please continue to pay attention to the relevant reports in car home. (Photo/Text/car home Chang Qinglin)