"Zeek" <cedricbmason@comcast.net> wrote in
news:dbWdndUzR-RusdzbnZ2dnUVZ_tunnZ2d@comcast.com:

> 1. I've got an illuminated check engine light.
>
> 2. What i notice while driving is: the rpm gauge works sporadically
> or not at all. The vehicle jerks a little during speed changes.
>
> 2. After hooking a OBD II scanner to it...I got po725.
>
> 3. The service manual says po725 ='s Symptom: lock-up clutch does
> not engage. Possible Causes: Disconnected ignition coil connector
>
>
>
> Short or open in ignition coil wire
>
>
>
> Faulty ignition coil
>
>
> 4. Service Manual goes on to say in the Troubleshooting Flowchart:
> Disconnect harness from the Transmission Control Module TCM and
> measure for battery voltage with the ignition switch on; at leads a5
> and a 26.
>
> -is there battery voltage?
> -NO repair open or short in the wire between the A5 terminal and
> the
> ignition coil.
>
> -YES Check for loose TCM connector. If necessary substitute a
> known good
> TCM and recheck.
>
>
> 5. After i measured the voltage, with the ignition switch on... i got
> a reading of 3 volts. Well below the 12 volt reading i get at the
> battery. The service manual gives a yes or no answer...I'm sort of
> in-between with 3 volts.
>
>
> 6. Do i have a bad ignition coil?
>
>
>

I'd suspect the igniter,inside the distributor.a Jerky tach is the clue.
The igniter is what triggers the coil,and sends a signal to the ECU for RPM
data.

--
Jim Yanik
jyanik
at
kua.net