secondchance
01-23-2017, 09:26 AM
Since my first engine pull/rebuild in spring 2014 my ASR has been throwing code H65 – adjuster assembly fault. Although “ASR” lit up on display screen was annoying, this did not hamper drivability of the car. I tried disconnect/reconnect of power, checked the fuse and even checked wiring from the ABS/ASR control module behind the driver side seat to the fuse behind the battery and found anything obvious. This lead me to suspect the ASR unit itself.
Naturally this part is no longer available and checking Ebay found multiple ASR assembly off of LT1 and LT4 cars but none from a LT5 car. Assembly, except for the mounting hardware and orientation, looked very similar so I took the plunge and picked one up for about $90. This part sat in my closet for about a year.
Last week I noticed my throttle pedal had a resistance half way through its travel – sort of felt similar to old Holley 4 barrel carb with mechanical secondaries. Last Saturday, after wrapping up Roadster’s Z, I had Jim take a look inside the air horn as I depressed the throttle. Surprise! Only the primary butterfly was opening. Further noticed 1st pulley (from the bottom) became stationary (coinciding with throttle pedal resistance) as 2nd pulley continued to rotate as throttle pedal was depressed.
Now that I only could run the car at about ¼ throttle max, I had to resolve this issue. So, last Sunday I took used ASR I bought, finally removed the assembly itself out of the bracket and cover and confirmed it to be an identical part to what was on the car. Replacing this part was pretty straight forward. Once new part was installed, throttle pedal movement became normal. When I started the car and goosed the throttle ASR warning light stayed off! No more service ASR light!
Now that the problem was solved, I got curious with how this assemble functioned.
Below are a few pics of different stages of disassembly. Unless you are a master watchmaker, this part is not serviceable.
Basically, first and second pulleys (from the bottom) act as one single unit due to internal connection by a wound up spring and its tension resulting in throttle pedal movement to throttle body. When rear wheel slippage is detected, electric motor operated by signal from ECBM (?) turns the half circle gear which determines maximum throttle opening and throttle pedal travel beyond max throttle dictated by the electric motor action is absorbed by slipping of 1st and the 2nd pulley. This slipping is handled by wound up spring found between the two pulleys. Plastic pulley on top has nothing to do with interface between these two pulleys and there to connect cruise control servo to throttle pulley.
http://i658.photobucket.com/albums/uu303/byongyun/IMG_0269_zpslxjywdsl.jpg (http://s658.photobucket.com/user/byongyun/media/IMG_0269_zpslxjywdsl.jpg.html)
http://i658.photobucket.com/albums/uu303/byongyun/IMG_0270_zpssrlvdew4.jpg (http://s658.photobucket.com/user/byongyun/media/IMG_0270_zpssrlvdew4.jpg.html)
http://i658.photobucket.com/albums/uu303/byongyun/IMG_0271_zps1kfjgvzi.jpg (http://s658.photobucket.com/user/byongyun/media/IMG_0271_zps1kfjgvzi.jpg.html)
http://i658.photobucket.com/albums/uu303/byongyun/IMG_0285_zpsmgytcllm.jpg (http://s658.photobucket.com/user/byongyun/media/IMG_0285_zpsmgytcllm.jpg.html)
Bottom line, if you have later car with ASR and ASR assembly breaks, have no fear. LT1/LT4 assembly will work fine and these parts are plentiful!
Naturally this part is no longer available and checking Ebay found multiple ASR assembly off of LT1 and LT4 cars but none from a LT5 car. Assembly, except for the mounting hardware and orientation, looked very similar so I took the plunge and picked one up for about $90. This part sat in my closet for about a year.
Last week I noticed my throttle pedal had a resistance half way through its travel – sort of felt similar to old Holley 4 barrel carb with mechanical secondaries. Last Saturday, after wrapping up Roadster’s Z, I had Jim take a look inside the air horn as I depressed the throttle. Surprise! Only the primary butterfly was opening. Further noticed 1st pulley (from the bottom) became stationary (coinciding with throttle pedal resistance) as 2nd pulley continued to rotate as throttle pedal was depressed.
Now that I only could run the car at about ¼ throttle max, I had to resolve this issue. So, last Sunday I took used ASR I bought, finally removed the assembly itself out of the bracket and cover and confirmed it to be an identical part to what was on the car. Replacing this part was pretty straight forward. Once new part was installed, throttle pedal movement became normal. When I started the car and goosed the throttle ASR warning light stayed off! No more service ASR light!
Now that the problem was solved, I got curious with how this assemble functioned.
Below are a few pics of different stages of disassembly. Unless you are a master watchmaker, this part is not serviceable.
Basically, first and second pulleys (from the bottom) act as one single unit due to internal connection by a wound up spring and its tension resulting in throttle pedal movement to throttle body. When rear wheel slippage is detected, electric motor operated by signal from ECBM (?) turns the half circle gear which determines maximum throttle opening and throttle pedal travel beyond max throttle dictated by the electric motor action is absorbed by slipping of 1st and the 2nd pulley. This slipping is handled by wound up spring found between the two pulleys. Plastic pulley on top has nothing to do with interface between these two pulleys and there to connect cruise control servo to throttle pulley.
http://i658.photobucket.com/albums/uu303/byongyun/IMG_0269_zpslxjywdsl.jpg (http://s658.photobucket.com/user/byongyun/media/IMG_0269_zpslxjywdsl.jpg.html)
http://i658.photobucket.com/albums/uu303/byongyun/IMG_0270_zpssrlvdew4.jpg (http://s658.photobucket.com/user/byongyun/media/IMG_0270_zpssrlvdew4.jpg.html)
http://i658.photobucket.com/albums/uu303/byongyun/IMG_0271_zps1kfjgvzi.jpg (http://s658.photobucket.com/user/byongyun/media/IMG_0271_zps1kfjgvzi.jpg.html)
http://i658.photobucket.com/albums/uu303/byongyun/IMG_0285_zpsmgytcllm.jpg (http://s658.photobucket.com/user/byongyun/media/IMG_0285_zpsmgytcllm.jpg.html)
Bottom line, if you have later car with ASR and ASR assembly breaks, have no fear. LT1/LT4 assembly will work fine and these parts are plentiful!