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DTC P1780: Problem in Shift Control System4. Honda Fit I

Automatic Trans ~334 words

Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review GENERAL TROUBLESHOOTING INFORMATION .

  1. Clear the DTC with the HDS.
  2. Test-drive the vehicle for several minutes in D through all five gears, then slow down to a stop.
  3. Turn the ignition switch to LOCK (0), and repeat the test-drive in step 2.
  4. Check for other DTCs indicated simultaneous with DTC P1780. NOTE: DTC P1780 means there is one or more A/T DTCs about the shift control system. Are there other DTCs? YES - Troubleshoot the problem indicated by the DTC. NO - Go to step 5 .
  5. Update the A/T software in the PCM if it does not have the latest software (see «UPDATING THE PCM»(ref-291388-S23566162872008072800000) ), or substitute a known-good PCM (see «SUBSTITUTING THE PCM»(ref-291388-S16714713492008072800000) ).
  6. Test-drive the vehicle for several minutes in D through all five gears, then slow down to a stop.
  7. Turn the ignition switch to LOCK (0), and repeat the test-drive in step 6.
  8. Check for DTC(s) in the DTCs/Freeze Data in A/T Mode Menu with the HDS. Is DTC P1780 indicated? YES - If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(ref-291388-S16714713492008072800000) ), then recheck. If the PCM was substituted, go to step 1 . NO - Go to step 9 .
  9. Monitor the OBD status for P1780 in the DTCs/ Freeze Data in A/T Mode Menu for a pass/fail. Does the HDS indicate PASSED? YES - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see «ECM/PCM REPLACEMENT»(ref-291411-S17209936142008072800000) ). If any other DTCs were indicated on step 8, go to the indicated DTCs troubleshooting. NO - Check for poor connections and loose terminals at the PCM. If the PCM was updated, substitute a known-good PCM (see «SUBSTITUTING THE PCM»(ref-291388-S16714713492008072800000) ), then recheck. If the PCM was substituted, go to step 1 . If the HDS indicates NOT COMPLETED, return to step 6 and recheck.

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