DTC Troubleshooting

DTC Troubleshooting: P1109, 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 ECM/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.�

4. Update the ECM/PCM if it does not have the latest software ECM/PCM Update (M/T), or substitute a known-good ECM/PCM.

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

Is DTC P1109 indicated?

YES -

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

NO -

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