QB1 - Check KAPWR to PCM

Continuous Memory Diagnostic Trouble Code (DTC) 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 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