NO HIGH RESOLUTION PULSE FROM OPTI ,code 36 ??

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Aug 18, 2006 | 01:49 PM

mjfox

Thread Starter

Racer

Joined: Aug 2002

Posts: 406

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From: hamilton ontario

NO HIGH RESOLUTION PULSE FROM OPTI ,code 36 ??

I scanned my 1992 corvette got a code 36 .Did the flow diagram from the gm manual comes up as NO HIGH RESOLUTION PULSE FROM OPTI
not being received by ecm.I do vave 4.7 volts coming from ecm to opti .Is there a repair for this or do I have to replace the entire opti.Can It be cleaned,

Thanks Mike

Aug 18, 2006 | 02:20 PM

SJW

Le Mans Master

Joined: May 2005

Posts: 7,374

Likes: 2,290

From: Central Maryland

Quote:

Originally Posted by mjfox

A high-res pulse failure Code 36 is almost surely caused by a fault within the optical section of the Optispark. Replacement of the Opti is the cure for that. The only other possibilities are an open connection between the Opti and the ECM on the high-res signal line, or a fault on that signal input line in the ECM itself (I've never heard of one that had such a failure, but it's possible that it could occur).

CF Member Tom Piper noted that a coil wire that's too close to the Opti harness can, in rare cases, cause anomalies on the Opti signal lines, but he also notes that the wiring harness on your '92 has a shield that the later LT1/LT4 Corvettes lack, and that this shield should prevent such an occurrence on a '92.

Check the harness between the Opti and ECM for any signs of an open circuit on the high-res signal line, and if you find nothing, there's a 99% chance that a new Opti will be the only cure.

Be well,

SJW

Aug 18, 2006 | 04:18 PM

mjfox

Thread Starter

Racer

Joined: Aug 2002

Posts: 406

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From: hamilton ontario

opti signal line

Which line is the opti signal line to the ecm
A low res black /red
B high res purple /white
C ignition feed yellow
D system ground black/pink
F system shield clear

anyone
know

thanks Mike

Aug 18, 2006 | 05:49 PM

SJW

Le Mans Master

Joined: May 2005

Posts: 7,374

Likes: 2,290

From: Central Maryland

Quote:

Originally Posted by mjfox

Which line is the opti signal line to the ecm
A low res black /red
B high res purple /white
C ignition feed yellow
D system ground black/pink
F system shield clear

anyone
know

thanks Mike

Code 36 indicates a high-res signal failure. Look at the purple/white line...

Be well,

SJW

Aug 18, 2006 | 05:57 PM

sonomacrew01

Burning Brakes

Joined: Nov 2004

Posts: 1,107

Likes: 0

From: RI

code 16 is the low res pulse off red/black and code 36 is purple/white.

Helms will tell you to check connections at the harness beside the intake manifold then the opti harness itself. If everything is good, bad optical sensor=bad opti.

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