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P0105

Barometric Pressure Sensor Circuit:









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 Conditions
- 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 4.45 volts or higher [corresponding to a barometric pressure of 114 kPa (16.5 psi) or higher] approximately 4,000 ft below sea level for 10 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 10 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 Tools:
MB991502: Scan Tool (MUT-II)
MB991709: Test Harness Set

CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.

STEP 1. Using scan tool MB991502, check data list item 25: Barometric Pressure Sensor.
1. Connect scan tool MB991502 to the data link connector.
2. Start the engine and run at idle.
3. Set scan tool MB991502 to the data reading mode for 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, this malfunction is intermittent. Refer to How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction.




STEP 2. Check the circuits at the barometric pressure sensor connector B-14.
1. Disconnect connector B-14 and measure at the harness side.
2. Turn the ignition switch to "ON" position.
3. Measure the voltage between terminal 1 and ground.
- Voltage should be between 4.8 and 5.2 volts.

4. Turn the ignition switch to "LOCK" (OFF) position.




5. Check for the continuity between terminal 5 and ground.
- Should be less than 2 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 output line at barometric pressure sensor connector B-14.
1. Disconnect connector B-14 and connect test harness special tool MB991709, in between.
2. Turn the ignition switch to "ON" position.
3. Measure voltage between terminal 2 and ground.

Standard value:
3.7 - 4.3 V [When altitude is 0 m (0 foot)]
3.4 - 4.0 V [When altitude is 600 m (1,969 feet)]
3.2 - 3.8 V [When altitude is 1,200 m (3,937 feet)]
2.9 - 3.5 V [When altitude is 1,800 m (5,906 feet)]

4. Turn the ignition switch to "LOCK" (OFF) position.

If within specifications, go to Step 4.

If not within specifications, replace the volume air flow sensor. Then go to Step 7.




STEP 4. Check the harness connector B-14 at the barometric pressure sensor for damage.
If harness connector B-14 is in good condition, replace the volume air flow sensor. Then go to Step 5.

If harness connector B-14 is damaged, repair or replace it. Refer to Harness Connector Inspection. Then go to Step 7.




STEP 5. Check harness connector C-40 at the PCM for damage.
If harness connector C-40 is damaged, repair or replace it. Refer to Harness Connector Inspection. Then go to Step 7.

If harness connector C-40 is in good condition, go to Step 6.







STEP 6. Check the harness wire between barometric pressure sensor connector B-14 and PCM connector C40.
If the wire between barometric pressure sensor connector B-14 and PCM connector C-40 are not damaged, replace the PCM. Then go to Step 7.

If the wire between barometric pressure sensor connector B-14 and PCM connector C-40 are damaged, repair it. Then go to Step 7.

STEP 7. 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 diagnostic trouble code P0105 does not reset.
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