Toyota has revealed that it is carrying out a greater range of checks on its cars after Timo Glock's heavy impact with the pit-wall during the German Grand Prix.

The rookie appeared to lose control over the final turn kerb before smashing backward into the wall, but extensive investigations back at the team's Cologne factory revealed a suspension failure, which was later traced to a part that had be left on the TF108 from the preceding British round.

Although the car had been checked over since Silverstone, and the part had been left in place as a matter of routine, the team suspects that it may have been more damaged that first appeared, following a tough outing in tricky conditions for Glock.

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"It took us some time to find out what happened, simply because, just after the [German] race, we were not finding anything exceptional with that car at the moment of the failure," technical director Pascal Vasselon explained, "We were just finding a load case, which was not explaining the failure. It took us a long time to find the life of this part and what went wrong. We found the cause was in the Silverstone race, where this rear right suspension corner has seen some outstanding loads."

Vasselon went on to explain that Toyota had revised its checking process to ensure that there would be no repeat of Glock's accident in future races, which was caused by a faulty toe-link..

"We have obviously a screening procedure to handle parts which may have been damaged by an incident," he confirmed, "Actually, we had detected a problem with the push rod but, in a race, we run a reduced number of sensors and we had not been able to re-estimate the loading of the suspension parts. Clearly, we have not been good enough for checking and screening these parts and we have improved our internal procedure now.

"It's a very normal process to re-use parts after a race, all teams do that. You just have to make sure that you have a screening process which detects faulty parts, and again, in this case, our process has detected pushrods.

"Pushrods have been changed, but the analysis has not been deep enough to detect or evaluate that an overload had been seen in other parts, so that's what we have improved. But, obviously, as soon as you have a doubt about a part, you change it, of course. In this case, we had no doubt about the part which went on the car for Hockenheim."