Re: code 13 on 89 cavalier.. 730 ecm

["Programmer" <nwester@eidnet.org>]

Mike,

Basically, if the O2 doesn't switch rich/lean, code 13 sets within a minute
of driving.

For a code 13 you need engine at operating temp, at least 2 minutes engine
time running, O2 signal basically steady between 0.35 and 0.55 volts, TPS
above 4%.
All conditions must be met for at least 60 seconds. Should be in closed
loop--but if code 13 sets, it never goes closed.
Check voltage at the O2 sensor--should be biased at 450mV to ground. (O2
disconnected-KOEO). With a scan tool connected, jumper the O2 lead to
ground -- you should have less than 200mV O2 signal on the scan tool engine
running. If the code still sets and all voltages are good, you've got a bad
ECM. Check for a shorted lead to the O2 (to ground) from the ECM. Hope this
helps...

Lyndon.

-----Original Message-----
From: Mike Rolica <mrolica@meridian-mag.com>
To: Gmecm (E-mail) <gmecm@diy-efi.org>
Date: May 11, 2000 8:37 AM
Subject: code 13 on 89 cavalier.. 730 ecm


>A friend is having a problem with code 13 coming on all the time..The
oxygen
>sensor was replaced with a new one and no changes.
>the service engine light comes on at about 65mph and stays on... seting the
>code 13.
>The replacement sensor is a ngk
>the ecm is a 730
>motor is a 2.8l v6
>
>any help or suggestions would be great.
>
>Mike Rolica
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