DTC Troubleshooting

DTC Troubleshooting: P1109

DTC P1109:

BARO Sensor Circuit Out of Range High

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information Initial Inspection and Diagnostic Overview.

1. Reset the PCM with the HDS.

2. Start the engine.

3. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P1109 indicated?

YES -

Go to step 4.

NO -

Intermittent failure, the system is OK at this time. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.�

4. Update the PCM if it does not have the latest software PCM Update, or substitute a known-good PCM.

5. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P1109 indicated?

YES -

If the PCM was updated, substitute a known-good PCM, then recheck. If the PCM was substituted, go to step 1.

NO -

If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM Service and Repair. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.�