OBD codes 14 and 71 diagnostic procedures?

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crashq - 25 Sep 2006 08:00 GMT

I just got my 92 3VZE 4x4 xxtra cab truck back from the mechanic (for
head replacement). After about 20 miles of driving, the "check engine
light" came on after about 5 miles of highway driving. I stopped,
checked it out, and after convincing myself that it wasn't anything
major drove it home.

I checked the OBD I codes and then cleared them. They were 14 (no
ignition reference signal) and 71 (EGR system malfunction). The first
code is listed for possible problems with the ignition coil, igniter or
circuit, or ECU. The second code has possible causes listed as EGr
system, EGR temperature sensor ofr circuit, EGR BVSV (i assume the
valve?) or VSV(?), or ECU. I drove another 5 miles to get the codes to
show again, but they never reappeared.

Does anyone have any ways of narrowing down either one of these
problems or at least a good manual that I could buy that has these
procedures in them?

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crashq - 25 Sep 2006 09:41 GMT

After further inspection, I may have found the problem with the EGR
system. One of the wires on a connector for the sensor that is inline
between the intake plenum/rail and the EGR valve had pulled loose from
the connector. I suspec that after I cleared the codes that I hadn't
got the engine hot enough to activate the EGR valve, that is why I
hadn't seen that code re-appear, yet. I will take a longer (hotter)
test drive tomorrow, to test out that theory.

As far as the ignition coil goes, is that just something that I should
replace anyway (with 230k)? It is cheap ($85) and I assume they have a
limited life.

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M. Cantera - 27 Sep 2006 03:56 GMT

sounds like the mechanic dis not connect the all th wiring to the
engine correctly or pulled some connectors.

EGR goes into test/diagnostic mode when the engine in sin cruise mode
at near 2000 rpm (when there is enough back pressure to require engine
operation) and the engine if at operating temperature. Possible
problems may ba a loose vacum hose or connector or a block
atmospherick line in the EGR solenoid. You would get a light after 10
minutes of driving if thee aw something wrong.

>After further inspection, I may have found the problem with the EGR
>system. One of the wires on a connector for the sensor that is inline
[quoted text clipped - 7 lines]
>replace anyway (with 230k)? It is cheap ($85) and I assume they have a
>limited life.

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