Tag: Denso

By on July 23, 2015


Left: Updated Tacoma Resistor, Right: Colorado Resistor

Left: Updated Tacoma Resistor, Right: Colorado Resistor

The fire-risk blower motor resistor harness has been recalled in the Hummer H3 and owners will start receiving repairs once parts become available. Owners of the Pontiac Solstice and Saturn Sky should be able to use the updated parts as well but will have to pay out of pocket as General Motors has not recalled them at this time. The Chevrolet Colorado and GMC Canyon also use a similar design and pose a similar fire risk but are slightly different than the recalled part due to having one less blower speed.

Hummer owners will most likely wait a few months minimum for the updated parts to get to their dealers to perform their free recall repairs. Colorado and Canyon owners may be waiting much longer — if they are recalled at all. The only silver lining for the Colorado and Canyon is that they use a similar resistor to the Toyota Tacoma and share a connector. The Tacoma also suffered from blower motor resistor issues and received updated parts along with a Technical Service Bulletin in 2011.

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By on January 30, 2015

Toyota SiC Power Control Unit 01

Toyota unveiled its plans Wednesday to trial a new hybrid system using silicon carbide power semiconductors that could find its way into hybrids and EVs.

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By on May 22, 2014

Toyota Hybrid Semiconductors

Looking to wring out more fuel efficiency in its hybrids, Toyota has developed a silicon-carbide wafer semiconductor that could boost efficiency up to 10 percent.

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By on September 19, 2013


Denso, the automotive electronics supplier with close ties to Toyota, has signed an agreement to buy $25.4 million worth of stock in the Sharp consumer electronics company. According to Automotive News, Denso says that the goal is to create new technologies that “improve the comfort, safety and convenience of vehicles by integrating vehicle technologies with home electronic technologies.”

(Read More…)

By on January 30, 2012

It was the early 2010, the Toyota witch hunt was in full swing. While Toyota executives were burnt at the stake grilled on the Hill, Denso’s U.S. offices were raided by the FBI. Denso is a major automotive parts supplier, and a member of the Toyota family. The raid was part of an on-going investigation into alleged anti-trust violations. Or so they said.

After the NHTSA, NASA and the National Academy of Sciences could not find a ghost in the machine, the Department of Justice also cleared out its case file. For a fee. (Read More…)

By on December 19, 2011

TTAC commentator/writer David Holzman writes:


My ’99 Accord 5speed with 200k on the clock needs a new gas tank. The fuel pump is inside the gas tank. Should I get a new fuel pump with that gas tank? Changing the tank will cost about $600; including a fuel pump will add $300. I’m planning to keep this car another year and a half to two years, at which point it will have about 230k. (Read More…)

By on June 23, 2010

You thought the strikes that affected Honda and Toyota in China are over, and both are happily churning out cars again? That makes two of us. But we are mistaken. (Read More…)

By on March 3, 2010

Here’s TTAC’s and the web’s only complete guide to Toyota’s gas pedals (so far), with tear downs, pictures, analysis, explanation, the shim fix, and commentary, all consolidated into one portal:

Part 1: Exclusive: TTAC Takes Apart Both Toyota Gas Pedals: Tear down of both the recalled CTS pedal assembly and the non-recalled Denso pedal assembly. Note: Assumptions and conclusions in this initial tear down lack the more complete understanding of the importance of the friction arm aspect of the CTS unit.

Part 2: Toyota Gas Pedal Fix Explained – With Exclusive Photos: Describes Toyota’s proposed fix for the recalled CTS gas pedal assembly, with detailed photos and graphics. Explains the significance of the friction arm assembly and its limitations.

Part 3: Toyota Gas Pedal Fix Simulated – Friction Reduced, By Too Much?: TTAC simulates the fix prescribed by Toyota for the recalled CTS pedal assembly, and notes how the fix changes the degree of friction, and the possible unintended result. With detailed pictures

Part 4: Why Toyota Must Replace Flawed CTS Gas Pedal With Superior Denso Pedal: Detailed analysis with pictures of the two pedal assemblies, an explanation as to why the Denso design is superior, and a call for having all CTS pedals replaced with the Denso pedal.

Part 5: TTAC Does The Toyota Pedal Shim Fix:  Stop Gap Solution At Best: Toyota’s solution is carried out here with detailed pictures, the whole Toyota document detailing the fix, and our commentary.

Part 6: Toyota Floor Mat/Gas pedal Recall Includes Computer Reflash And Trimming Of Gas Pedals: Info on the details of the floor mat/gas pedal interference recall.

Part 7: Toyota Recall  Creates Unintended Accelerator Consequences: As predicted in Part 4 (above), the CTS shim fix reduces the carefully designed amount of friction required for comfortable and smooth pedal action to the point where pedal action may now be jerky and potentially unsafe.

(Thanks to you-know-who-you-are for access to these parts and info)

By on February 24, 2010

Reuters reports that the Detroit offices of Denso, a major Japanese automotive supplier, has been raided by the FBI as part of an on-going investigation into alleged anti-trust violations. Denso spokeswoman Bridgette Gollinger said the investigation was “absolutely not” related to ongoing recalls by Toyota. Denso supplies accelerator pedals (see above) and other components to the automaker. “We are cooperating with the investigation,” Gollinger said. The FBI raid was first reported by The Wall Street Journal, which said that federal investigators had also searched the Detroit area offices of two other Toyota suppliers, Yazaki and Tokai Rika. Curious coincidence of timing as this happens while Akio Toyoda testifies on Capitol Hill.

By on January 30, 2010

Update: To see all of TTAC’s related articles on the subject of Toyota gas pedals, go here:

In yesterday’s post , we offered a bounty for anyone to open up both the CTS (bottom) and Denso (top) Toyota gas pedal assemblies. No one took us up, and no one anywhere else has done it, so we took it upon ourselves . Here they are, both e-pedal assemblies taken apart and examined, in our quest to understand if and what the significant differences are, and how Toyota’s possible “shim” fix would work.  On initial observation, it appears that the CTS may be perceived as being the more solidly engineered/built unit, in that the pedal pivots on a traditional and solid steel axle whose bearings are brass or bronze sleeves. The Denso’s whole pivot and bearing surfaces are relatively flimsy-feeling plastic. But that can be deceptive, and we’re not qualified to judge properly if it is indeed inferior or superior.  So the question that goes beyond the analysis of these e-pedals is this: are these units really the full source of the problem, or are they scape goats for an electronics and/or software glitch? Pictures and tear down examination and analysis follows:

Update #2: It’s clear to me now that the CTS unit I took apart already had the side cover plates (sheet metal) removed before I examined it. One can see where they fit, and are obviously intended to protect the exposed axle pivot and bushing seen above and below:

(Update #3: Also see our follow-up stories on Toyota’s fix and our replication of the fix and its results)

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