Check ASR and Sys light-help
Thread Starter
Cruising
Joined: Nov 2000
Posts: 11
Likes: 0
From: ny
Check ASR and Sys light-help
After my 92 is running a while, the check ASR and sys lights come on. I can not restart the car and it will just crank. It is showing a code 42. Anyone else have this problem and any suggestions on how to fix it would be appreciated. Thanks.
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
Burning Brakes
Joined: Nov 2005
Posts: 848
Likes: 1
From: 1992 LT1 6 speed Cayman Islands
ICM Connector or Ground
I had this exact problem with ASR and sys lights on my 92 and the same code 42 - Electronic Spark Timing Circuit (grounded circuit).
My tach also jumped around when this problem occured while driving as the connection to the Ignition Controm Module (or Driver) also has the tach filter circuit.
The problem was intermittant with mine when car would crank but not start because there was no fire to the plugs.
The problem with mine was a sloppy connection at the ICM (little black box bolted to the coil bracket on my LT1, or inside distributor on L98).
I had lost the ruber weather seal on the plug and the vibrations caused the contacts to open enough for then to lose contact withh the ground.
This ground goes directly to the front of the left cylinder head by the water pump.
Your problem is either:
1. Bad connection to ICM
2. Bad connection to ground on cylender head.
3. Broken wire between ICM and ground, or
4 Bad ICM.
Hope this helps
Jerris
My tach also jumped around when this problem occured while driving as the connection to the Ignition Controm Module (or Driver) also has the tach filter circuit.
The problem was intermittant with mine when car would crank but not start because there was no fire to the plugs.
The problem with mine was a sloppy connection at the ICM (little black box bolted to the coil bracket on my LT1, or inside distributor on L98).
I had lost the ruber weather seal on the plug and the vibrations caused the contacts to open enough for then to lose contact withh the ground.
This ground goes directly to the front of the left cylinder head by the water pump.
Your problem is either:
1. Bad connection to ICM
2. Bad connection to ground on cylender head.
3. Broken wire between ICM and ground, or
4 Bad ICM.
Hope this helps
Jerris
