How well do you know your truck!!!
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03-14-2012, 11:29 AM
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03-14-2012, 11:30 AM
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03-14-2012, 12:11 PM
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03-14-2012, 12:13 PM
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03-14-2012, 01:13 PM
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03-14-2012, 01:14 PM
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03-14-2012, 01:18 PM
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03-14-2012, 02:07 PM
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#9
03-14-2012, 03:13 PM
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What it does:
If the brakes are engaged hard enough that a certain amount of forward inertia is achieved, the ECM shuts down fuel delivery completely and locks the torque converter - the vehicle's momentum is what turns the engine. This provides maximum compression (engine) braking while saving on fuel consumption.
The transmission will probably also downshift to raise RPMs in this mode to both improve compression braking and lower the risk of the engine "stalling" if the vehicle were to suddenly stop and fuel delivery could not be returned in time to keep the engine turning.
My '09 Corolla has this feature, as do a lot of late model vehicles. It's a very practical innovation, with the only real "side effect" being increased transmission wear since the driveline is loaded up rather than almost freewheeling during the deceleration.
If the brakes are engaged hard enough that a certain amount of forward inertia is achieved, the ECM shuts down fuel delivery completely and locks the torque converter - the vehicle's momentum is what turns the engine. This provides maximum compression (engine) braking while saving on fuel consumption.
The transmission will probably also downshift to raise RPMs in this mode to both improve compression braking and lower the risk of the engine "stalling" if the vehicle were to suddenly stop and fuel delivery could not be returned in time to keep the engine turning.
My '09 Corolla has this feature, as do a lot of late model vehicles. It's a very practical innovation, with the only real "side effect" being increased transmission wear since the driveline is loaded up rather than almost freewheeling during the deceleration.
Last edited by RyPow; 03-14-2012 at 03:20 PM.
#11
03-14-2012, 04:38 PM
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It sometimes bugs me too when my Corolla does it, especially if the road levels out after a ADFSO descent and it can the trans up to 10 seconds to upshift back to the next gear once the power comes back on.