QB1 - Check KAPWR to PCM

1994 Ford Taurus V6-182 3.0L DOHC SHOSECTION QB1 - Check KAPWR to PCM


Continuous Memory Diagnostic Trouble Code (DTC) 15/512 indicates the Powertrain Control Module (PCM) has experienced a power interrupt in its Keep Alive Memory (KAM) circuit.

NOTE: If Keep Alive Power (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 Digital Volt/Ohm Meter (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. Quick Test Appendix (Detailed Testing Instructions)

No -- Reconnect PCM. Go to QB2. QB2 - Inspect Engine Compartment Wiring For Proper Routing
RENDER: 1.0x

NO RELATED

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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.