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P0105

Barometric Pressure Sensor Circuit:




Connector: C-71:




CIRCUIT OPERATION
- A 5-volt voltage is supplied to the barometric pressure sensor power terminal (terminal 1) from the PCM (terminal 46). The ground terminal (terminal 5) is grounded with PCM (terminal 57).
- A voltage that is proportional to the atmospheric pressure is sent to the PCM (terminal 55) from the barometric pressure sensor output terminal (terminal 2).

TECHNICAL DESCRIPTION
- The barometric pressure sensor outputs a voltage which corresponds to the barometric pressure.
- The PCM checks whether this voltage is within a specified range.

DTC SET CONDITIONS

Check Area
- Two seconds or more have passed since the starting sequence was completed.
- Battery voltage is higher than 8 volts.

Judgement Criteria
- Barometric pressure sensor output voltage has continued to be 0.445 volts or higher [corresponding to a barometric pressure of 114 kPa (16.5 psi) or higher] approximately 4,000 ft below sea level for ten seconds.
or
- Barometric pressure sensor output voltage has continued to be 1.95 volts or lower [corresponding to a barometric pressure of 50 kPa (7.3 psi) or lower] approximately 15,000 ft above sea level for ten seconds.

TROUBLESHOOTING HINTS
The most likely causes for this code to be set are:
- Barometric pressure sensor failed.
- Open or shorted barometric pressure sensor circuit, or loose connector.
- PCM failed.

DIAGNOSIS
Required Special Tool:
MB991502: Scan Tool (MUT-II)

CAUTION: To prevent damage to the scan tool, turn the ignition switch "OFF" before connecting or disconnecting the scan tool.




STEP 1. Using scan tool MB991502, check data list item 25: Barometric Pressure Sensor.
- At altitude 0 m (0 foot), 101 kPa.
- At altitude 600 m (1,969 foot), 95 kPa.
- At altitude 1,200 m (3,937 foot), 88 kPa.
- At altitude 1,800 m (5,906 foot), 81 kPa.

If not within specifications, go to Step 2.

If within specifications, it can be assumed that this malfunction is intermittent. Refer to vehicle level Testing and Inspection.

STEP 2. Check the circuits at the barometric pressure sensor connector A-01.

1. Disconnect connector A-01 and measure at the harness side.
2. Turn the ignition switch "ON".




3. Measure the voltage between terminal 1 and ground.
- Voltage should be between 4.8 and 5.2 volts.

4. Turn the ignition switch "OFF".




5. Check for the continuity between terminal 5 and ground.
- There should be continuity. (0 ohms).

If all checks above meet the specifications, go to Step 3.

If any check above does not meet the specifications, go to Step 6.







STEP 3. Check the harness wire between the barometric pressure sensor connector A-01 (terminal 2) and the PCM connector C-90 (terminal 55).

If the wire between the barometric pressure sensor connector A-01 (terminal 2) and PCM connector C-90 (terminal 55) are not damaged, go to Step 4.

If the wire between barometric pressure sensor connector A-01 (terminal 2) and PCM connector C-90 (terminal 55) are damaged, repair it. Then go to Step 8.




STEP 4. Check the harness connector A-01 at the barometric pressure sensor for damage.

If harness connector A-01 is in good condition, replace the volume air flow sensor. Then go to Step 5.

If harness connector A-01 is damaged, refer or replace it. Refer to vehicle level Testing and Inspection. Then go to Step 8.

STEP 5. Test the OBD-II drive cycle.

1. Carry out a test drive with the drive cycle pattern.
2. Check the diagnostic trouble code (DTC).

If DTC P0105 is output, go to Step 7.

If DTC P0105 is not output, the inspection is complete.




STEP 6. Check the harness wire between barometric pressure sensor connector A-01 and PCM connector C-90.

NOTE: After inspecting the intermediate connector C-71, check the wire. If the intermediate connector C-71 is damaged, repair or replace it. Refer to vehicle level Testing and Inspection. Then go to Step 8.

If the wire between barometric pressure sensor connector A-01 and PCM connector C-90 is not damaged, go to Step 7.




If the wire between barometric pressure sensor connector A-01 and PCM connector C-90 is damaged, repair it. Then go to Step 8.




STEP 7. Check harness connector C-90 at the PCM for damage.

If harness connector C-90 is damaged, repair or replace it.Refer to vehicle level Testing and Inspection.

If harness connector C-90 is in good condition, replace the PCM.

Then go to Step 8.

STEP 8. Test the OBD-II drive cycle.

1. Carry out a test drive with the drive cycle pattern.Refer to Procedure 6 - Other Monitor
2. Read the diagnostic trouble code and confirm that a diagnostic trouble code is not being output.
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