P0727

DTC P0727: Problem in Engine RPM Signal Input Circuit (No Signal Input)
2003 AT-PZEV (SULEV) and 2004-2005 AT-PZEV Models

NOTE:
^ Record all freeze data and review General Troubleshooting Information before you troubleshoot.
^ This code is caused by an electrical circuit problem and cannot be caused by a mechanical problem in the transmission.

1. Start the engine.
2. Check the ENGINE SPD with the HDS in the data list.
Is the ENGINE SPD 128 rpm and above?
YES- Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the gauge assembly and TCM.
NO- Go to step 3.
3. Check the tachometer in the gauge assembly operation.
Does the tachometer operate properly?
YES- Go to step 4.
NO- Check the gauge assembly operation.
4. Turn the ignition switch OFF.
5. Disconnect TCM connector A (31P).
6. Disconnect ECM connector E (31P).





7. Check for continuity between TCM connector terminal A28 and ECM connector. E26.
Is there continuity?
YES- Check for loose or poor connections at TCM connector terminal A28 and ECM connector. terminal E26. If the connections are OK, update the TCM if it does not have the latest software, or substitute a known-good TCM, then recheck. If the symptom/indication goes away with a known-good TCM, replace the original TCM.
NO- Repair open in the wire between TCM connector terminal A28 and ECM connector terminal E26.