i need to access the check engine light codes on this car(4.6),unlike the gm
obd 1 system of jumping test terminals on the connector and reading the
"check eng. light flashes"(so easy,so simple)everyone tells me so far i,ve
talked to that there is a test plug somewhere under the hood and you've got
to jump terminals and use a multimeter use read sweeps of the needle to get
the codes,another tells me that you have to jump terminals and read the
"check eng. light flashes"with the test plug under the hood,still another
tells me that you can jump terminals like a gm connector under the dash to
read the flashes on the "check eng. light",yet another tells me that i have
to buy a code reader that plugs into the test plug under the hood,this is
way to complacated,just what is the way to read the codes rather then having
a mech. do it at a price???
also,does this car have one or two O2 sensors on it??
Almost all the answers you received are correct. EEC IV vehicles (like
yours) have a six-pin 'self test connector' and a single pin 'self test
input' connector. You put the engine computer in diagnostic mode by making a
connection between the single pin and the appropriate (actually ground) pin
on the 6-pin connector. You can read the codes on your 'check engine' light,
on a test lamp plugged between the correct pin on the connector and B+, or
substitute an analog voltmeter for the test light (actually, the check
engine light in your vehicle goes exactly to the same spot where you'd plug
the test light). There is plenty of information on the net (including the
archives of this group) about the details and the various tests you can run.
As they say, Google is your friend... Search for 'EEC IV diagnostic codes'
or some such.
If you want to take a shortcut to the tune of about $40, a code reader
engages both connectors, makes the right connections, and has an LED, on
which it flashes the codes. Those typically come with a brochure, listing
the codes and the various tests you might run. Whether to replace a paper
clip (to short the two pins together) and a Google search with a $40 gizmo
is up to you...
The real problem, of course, is not how to read the codes, but what to do
with the results. Use the kind souls on this group - they are eager to help!
Being a V-type engine, yours has two (most likely heated) oxygen sensors,
one on each bank. Newer, (OBDII) vehicles with V-engines have four of them.
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