DTC P2227: BARO Sensor Circuit 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 these DTCs first, then recheck for DTC P2227.

Turn the ignition switch ON (II), and wait 2 seconds.
Check the BARO in the DATA LIST with the HDS.
Is atmospheric pressure indicated?
1. YES - Go to step 3.
2. NO - Update the PCM if it does not have the latest software, or substitute a known-good PCM (see PCM UPDATING AND SUBSTITUTION FOR TESTING ), then recheck. If the symptom/indication goes away with a known-good PCM, replace the original PCM (see PCM REPLACEMENT ), then go to step 1.
Clear the DTC with the HDS.
Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
Test-drive under these conditions, then connect the HDS.
- Engine coolant temperature above 158°F (70°C)
- A/T in D5 position
- Throttle position between 12 degrees and 20 degrees for 2 seconds
Monitor the OBD STATUS for DTC P2227 in the DTCs MENU with the HDS.
Does the screen indicate FAILED?
1. YES - Go to step 7.
2. NO - If the screen indicates PASSED, intermittent failure, system is OK at this time. If the screen indicates NOT COMPLETED, go to step 4 and recheck.
Update the PCM if it does not have the latest software, or substitute a known-good PCM (see PCM UPDATING AND SUBSTITUTION FOR TESTING ).
Check for Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or DTCs indicated?
1. YES - If DTC P2227 is indicated, check for poor connections or loose terminals at the PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
2. NO - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see PCM REPLACEMENT ).