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post #1 of 5 (permalink) Old 01-18-2005, 11:03 AM Thread Starter
jay
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code 15???

OKay latley my 90 bird 3.8 na has been acting up like starting hard and having to give it gas for like 20 sec after start up also it stalls from time to time and hessitates only when cold ......Muffler blew a bunch of that fiberglass s*** out and and the pipe from the res to the muffler now has holes in it so my Dad thinks that the starting problem could be the muff plugged up.........could it????
Also it never throws codes but twice after start up untill i drive away. I scaned and got code 15---power memory failure to PCM....where is that located and is it easy/cheap......


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post #2 of 5 (permalink) Old 01-18-2005, 12:03 PM
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For what it's worth, the following is from the 1994 PC/ED Manual, rather than the 1990 manual (which I don't have):

QB1 CHECK KAPWR TO POWERTRAIN CONTROL MODULE (PCM)

Continuous Memory DTC 15/512 indicates the PCM has experienced a power interrupt in its Keep Alive Memory (KAM) circuit.

Note: If KAPWR is interrupted to the PCM, for example when installing a breakout box, or when battery is disconnected, DTC 15/512 may be stored in Continuous Memory.

-Key off.
-Disconnect Powertrain Control Module (PCM). Inspect for damaged or pushed out pins, corrosion, loose wires, etc. Service as necessary.
-Install breakout box, leave PCM disconnected.
-Measure voltage between Test Pin 1 and Test Pin 40 or 60 at the breakout box.
-While observing DVOM, grasp the EEC-IV harness and wiggle, shake or bend a small section while working from the PCM to the dash panel.

Does DVOM indicate less than 10.5 volts?

Yes
SERVICE open circuit. REMOVE breakout box. RECONNECT PCM. RERUN Quick Test.

No
RECONNECT PCM. GO to QB2 .

QB2 INSPECT ENGINE COMPARTMENT WIRING FOR PROPER ROUTING

-Inspect EEC wiring for closeness to ignition components or wires. If EEC wiring is close, reroute as necessary.
-Clear Continuous Memory DTC (refer to Quick Test Appendix, Section 5A).
-Wait five minutes to allow DTC 15/512 to reset.
-Rerun Key On Engine Off Self-Test.

Is DTC 15 or 512 still present on retest?

Yes
REPLACE PCM. REMOVE breakout box. RERUN Quick Test.

No
REMOVE breakout box. RECONNECT PCM. SERVICE other DTCs as necessary. If none, testing is complete.

Also, the chart listing all the codes states to replace the PCM if code #15 is read with the Key On, Engine Off (KOEO) test and the Key On, Engine Running (KOER) test...

The PCM is located inside the passenger side kick panel:


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post #3 of 5 (permalink) Old 01-18-2005, 12:35 PM Thread Starter
jay
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now im just confused can someone also answer some of my Q's

1990 Ford Thunderbird 3.8L V6 N/A
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post #4 of 5 (permalink) Old 01-18-2005, 11:22 PM
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well if it were clogged it obviously wouldnt be blowing stuff out your exhaust, but it sounds like a bad IAC or possibly a clogged catalytic converter. After driving it one day open your hood and look down at the cats and see if they're glowing bright red. It might be best to do this at night time so you can actually see if they're glowing.
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post #5 of 5 (permalink) Old 01-22-2005, 07:45 PM Thread Starter
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Problem solved i reset the eec and then changed the muff and pipe from resonator to muff and the starting issue was a coolent temp sensor which i replaced like 4 months ago damn aftermarket plastic sensors!!!!!!!!!! all those problems with starting from a damn 30 dollar part.....so glad now...

1990 Ford Thunderbird 3.8L V6 N/A
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1989 Ford Thundebird 3.8L V6 N/A (PARTS CAR) GONE

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