Code 14

[YBNormL]

I've been having a problem with my explorer stalling out when accelerating from a stop. After the engine stalls, I find a code 14 - PIP Circuit Failure, code 51 - ECT or IAT reads -40 or circuit open, and code 54 - IAT circuit open stored in the computer.

What is a PIP Circuit failure. I can reason out the ECT (Engine Coolant Temperature) and IAT (Intake Air Temperature). The ECT & IAT Sensors are new, so I'm tracing the wiring looking for breaks.

Please help. This stalling problem is becoming more frequent.

 

[RiverRat]

Check out the ECT, IAT for open circut first. Could be something like a loose connector or bad ground. The PIP is profile ignition pickup IIRC.

 

[MrShorty]

I glanced over the circuit test for a continuous memory code 212 (PIP failure) on a '95 explorer. It appears to have an extensive test procedure to test the operation of the IDM. If you can find the same circuit test for your '91 (The one for a '95 that's available in the "gtest.pdf" file I've referenced before might be adequate), you should get a fairly extensive test procedure so you can hopefully figure out what's wrong.
Whenever I see someone get a temperature code from the ECT and/or IAT, I always ask if the self-test was performed with the engine at operating temperature. A cold engine will almost always set those codes (as KOEO hard faults). If they are continuous memory codes, I would suspect a short to Vref which is also mentioned in the circuit test for the PIP failure.