ASR Fault Code 62
Thread Starter
Safety Car
Joined: Oct 2000
Posts: 4,234
Likes: 355
From: Albuquerque, NM
ASR Fault Code 62
Does anyone have any experience with ASR code 62? I was driving my '92 LT1 today when the car died in traffic. I got it started after a minute and it ran fine all the way home, however, the "Service ASR" light remained on.
I retrieved the CCM, ECM, and ASR codes, and the only one I got was an ASR code 62, which is a "tach pulses fault." According to the factory service manual, there's either a short to ground or an open circuit in CKT 121 (a white wire going into the EBCM). Whether it's a short or an open circuit, it's probably intermittent since the car seems to run fine now. Does anyone know anything about this circuit and where/what I should be looking for?
Thanks for any help!
I retrieved the CCM, ECM, and ASR codes, and the only one I got was an ASR code 62, which is a "tach pulses fault." According to the factory service manual, there's either a short to ground or an open circuit in CKT 121 (a white wire going into the EBCM). Whether it's a short or an open circuit, it's probably intermittent since the car seems to run fine now. Does anyone know anything about this circuit and where/what I should be looking for?
Thanks for any help!
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
The wire in question comes off the coil harness.
It is terminal B, I beleive.
The other side of this could be a failing coil, ignition module (coil driver) or even the opti (I seriously doubt).
It is terminal B, I beleive.
The other side of this could be a failing coil, ignition module (coil driver) or even the opti (I seriously doubt).
Thread Starter
Safety Car
Joined: Oct 2000
Posts: 4,234
Likes: 355
From: Albuquerque, NM
The opti and coil are relatively new, so they SHOULD be ok. I'll check the wiring going to the coil. I'll also check the wiring to the ASR computer (EBCM)... is this in the compartment behind the driver's seat?
Thread Starter
Safety Car
Joined: Oct 2000
Posts: 4,234
Likes: 355
From: Albuquerque, NM
Just found this in the factory service manual: "A short to ground in CKT 121 with the LT1 engine may cause driveability problems. If the ground is on the ignition system side of the tach filter, there may be a no-start or extremely poor driveability condition."
This sounds like what I experienced for a short time, so my best guess is an intermittent short to ground in the wire that runs between the coil and the tach filter.
So my question is, where is the tach filter and what does it look like?
This sounds like what I experienced for a short time, so my best guess is an intermittent short to ground in the wire that runs between the coil and the tach filter.
So my question is, where is the tach filter and what does it look like?
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
Originally Posted by BlackbirdZ07
I don't know how to tell if the tach filter is bad, but I'll check the connections tomorrow. Thanks!
I have one, I think, from my 92... if I can find it and you need it, lemme know.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
