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DTC P0607: PCM Back Up Circuit Malfunction

  1. Reset the PCM (see HOW TO RESET THE PCM ).
  2. Turn the ignition switch OFF.
  3. Turn the ignition switch ON (II).

    Is DTC P0607 indicated? 

    1. YES:  Substitute a known-good PCM and recheck (see HOW TO SUBSTITUTE THE PCM FOR TESTING PURPOSE ). If the symptom/indication goes away, replace the original PCM.
    2. NO:  Go to step 4.
  4. Cycle the ignition switch OFF and ON (II) five times.
  5. Check for a DTC or a Temporary DTC with the scan tool or the HDS.

    Is DTC P0607 indicated? 

    1. YES:  Inspect the No 13 CLOCK BACK UP (7.5A) fuse in the passenger's under-dash fuse/relay box. If the fuse is OK, repair an open in the wire between the PCM (A1) and passenger's under-dash fuse/relay box.
    2. NO:  Intermittent failure, system is OK at this time. A low battery can cause this problem. Ask the customer if the engine had to be jump-started recently.
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