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HOMESERVICE MANUALSFORD1993PICKUP F250, 2D PICKUP, 5.0 N, STANDARD, M5OD-R2REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 5 (ENGINE CONTROLS - TESTS W/CODES - EEC-IV)CIRCUIT TESTSCIRCUIT TEST QB - CONTINUOUS MEMORY CODE 15 OR 512DIAGNOSTIC AID
1993 Ford Pickup F250, 2D Pickup, 5.0 N, Standard, M5OD-R2

Diagnostic Aid

1993 Ford Pickup F250, 2D Pickup, 5.0 N, Standard, M5OD-R2SECTION Diagnostic Aid
WARNING: This page is about a different car, the 1994 Ford Bronco. However, it is still accessible from the selected car via links, so may be relevant.

Continuous Memory Code 15/512 may be displayed when power between PCM and KAPWR is interrupted. This code may be set when a breakout box is installed or battery is disconnected.

1) Continuous Memory Code 15/512: Check KAPWR Circuit Voltage  Code 15/512 indicates PCM power interruption in Keep-Alive Memory (KAM). Clear codes and repeat QUICK TEST  . If Code 15/512 is repeated, turn ignition off. Disconnect 60-pin PCM connector. Inspect terminals, and repair if damaged. Install EEC-IV Breakout Box (T83L-50-EEC-IV), leaving PCM disconnected. Measure voltage between test pin No. 1 and test pins No. 40 or 60 at breakout box. Observe voltage reading while wiggling small sections of EEC wiring harness from PCM to dash. If reading is less than 10.5 volts, repair open circuit and repeat QUICK TEST. If reading is 10.5 volts or more, go to next step.

2) Inspect Wiring Harness Routing  Ensure EEC wiring is not routed close to ignition components and secondary ignition wires. If necessary, reroute EEC wiring. Clear codes, and wait 5 minutes. Repeat KOEO SELF-TEST. If Continuous Memory Code 15/512 is not repeated, testing is complete. If Continuous Memory Code 15/512 is still present, replace PCM and repeat QUICK TEST  .

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.