DTC P2227: BARO Sensor Range/Performance Problem

NOTE:

Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).
If DTC P0107, P0108, P1128, and/or P1129 are stored at the same time as DTC P2227, troubleshoot those DTCs first, then recheck for DTC P2227.

Turn the ignition switch to ON (II), and wait 2 seconds.
Check the BARO SENSOR in the DATA LIST with the HDS.
Is about 101 kPa (29.9 in.Hg, 760 mmHg), or about 2.9 V at sea level indicated?

YES -Go to step 3.

NO -Go to step 8.
Clear the DTC with the HDS.
Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
Test-drive under these conditions:
- Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C)
- Transmission in D
- REL TP SENSOR between 14 deg and 28 deg for at least 3 seconds
Monitor the OBD STATUS for DTC P2227 in the DTCs MENU with the HDS.
Does the screen indicate FAILED?

YES -Go to step 7.

NO -If the screen indicates PASSED, intermittent failure, the system is OK at this time. Check for something that may have clogged the intake air system. If the screen indicates NOT COMPLETED, go to step 4 and recheck.
Check the intake air system for clogging or restrictions (foreign material, dirty air cleaner element, etc.).
Is the intake air system clogged or restricted?

YES -Remove the clog or restriction, then go to step 9.

NO -Go to step 8.
Update the PCM if it does not have the latest software (see PCM UPDATE ), or substitute a known-good PCM (see SUBSTITUTING THE PCM ).
Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.
Test-drive under these conditions:
- Engine coolant temperature (ECT SENSOR 1) above 158°F (70°C)
- Transmission in D
- REL TP SENSOR between 14 deg and 28 deg for at least 3 seconds
Check for Pending or Confirmed DTCs with the HDS.
Is DTC P2227 indicated?

YES -Check for poor connections or loose terminals at the PCM. If the PCM was updated, substitute a known-good PCM (see PCM UPDATE ), then go to step 9. If the PCM was substituted, go to step 1.

NO -Go to step 12.
Monitor the OBD STATUS for DTC P2227 in the DTCs MENU with the HDS.

Does the screen indicate PASSED?

YES -If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see PCM REPLACEMENT ). If any other Pending or Confirmed DTCs were indicated in step 11, go to the indicated DTC's troubleshooting.

NO -If the screen indicates FAILED, check for poor connections or loose terminals at the PCM. If the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ), then go to step 9. If the PCM was substituted, go to step 1. If the screen indicates NOT COMPLETED, go to step 9.