DIAGNOSIS Required Special Tools: • MB991958: Scan Tool (MUT-III Sub Assembly) MB991824: V.C.I MB991827: USB Cable MB991911: Main Harness B

STEP 1. Using scan tool MB991958, check data list item 25: Barometric Pressure Sensor.

To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. (1) Connect scan tool MB991958 to the data link connector. (2) Start the engine and run at idle. (3) Set scan tool MB991958 to the data reading mode for item 25, Barometric Pressure Sensor. When altitude is 0 m (0 foot), 101 kPa (29.8 in.Hg). When altitude is 600 m (1,969 feet), 95 kPa (28.1 in.Hg). When altitude is 1,200 m (3,937 feet), 88 kPa (26.0 in.Hg). When altitude is 1,800 m (5,906 feet), 81 kPa (23.9 in.Hg). (4) Turn the ignition switch to the "LOCK" (OFF) position. Q: Is the sensor operating properly? YES: It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points . NO: Go to Step 2.

STEP 2. Replace the airflow sensor.

(1) Replace the airflow sensor. (2) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Procedure 6 - Other Monitor . (3) Check the diagnostic trouble code (DTC). Q: Is DTC P2227 set? YES: Go to Step 3. NO: The procedure is complete.

STEP 3. Check connector A-01 at the barometric pressure sensor and connector C-90 at PCM for damage.

Q: is the connector in good condition? YES: Go to Step 4. NO: Repair or replace it. Refer to GROUP 00E, Harness Connector Inspection . Then go to Step 7.

STEP 4. Check for harness damage between barometric pressure sensor connector A-01 (terminal No. 1) and PCM connector C-90 (terminal No. 46).

Q: Is the harness wire in good condition? YES: Go to Step 5. NO: Repair it. Then go to Step 7.

STEP 5. Check for harness damage between barometric pressure sensor connector A-01 (terminal No. 5) and PCM connector C-90 (terminal No. 57).

NOTE: Check harness after checking intermediate connector C-71. If intermediate connector is damaged, repair or replace it. Refer to GROUP 00E, Harness Connector Inspection . Then go to Step 7. Q: Is the harness wire in good condition? YES: Go to Step 6. NO: Repair it. Then go to Step 7.

STEP 6. Check for harness damage between barometric pressure sensor connector A-01 (terminal No. 2) and PCM connector C-90 (terminal No. 55).

Q: Is the harness wire in good condition? YES: Replace the PCM. Then go to Step 7. NO: Repair it. Then go to Step 7.