P0105
Borometric Pressure Circuit Malfunction:
CIRCUIT OPERATION
- A 5-volt voltage is supplied to the barometric pressure sensor power terminal (terminal 1) from the ECM (terminal 81)
- A voltage that is proportional to the atmospheric pressure is sent to the ECM (terminal 85)
TECHNICAL DESCRIPTION
- The barometric pressure sensor outputs a voltage which corresponds to the barometric pressure.
- The ECM or 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 positive 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 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.
- ECM failed.
- 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. Turn the ignition switch to "ON" position.
3. Set scan tool MB991502 to the data reading mode for item 25, Barometric Pressure Sensor.
- At an altitude of 0 m (0 foot), 101 kPa.
- At an altitude of 600 m (1,969 feet), 95 kPa.
- At an altitude of 1,200 m (3,937 feet), 88 kPa.
- At an altitude of 1,800 m (5,906 feet), 81 kPa.
If within specifications, this malfunction is intermittent. Refer to How to Use Troubleshooting/Inspection Service Points - How to Cope With Intermittent Malfunction.
If not within specifications, go to Step 2.
STEP 2. Check the circuit at 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 5.
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 the voltage between terminal 2 and ground.
Standard value:
3.7 - 4.3 V [When an altitude is 0 m (0 foot)]
2.9 - 3.5 V [When an altitude is 1,800 m (5906 feet)]
3.2 - 3.8 V [When an altitude is 1,200 m (3,937 feet)]
3.4 - 4.0 V [When an altitude is 600 m (1969 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 harness connector B-14 at the barometric pressure sensor for damage.
If harness connector B-14 is in good condition, 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-60 at the ECM
If harness connector C-60
If harness connector C-60
Then go to Step 7.
STEP 6. Check the harness wire between barometric pressure sensor connector B-14 and ECM connector C-60
If the wire between barometric pressure sensor connector B-14 and ECM connector C-60
Then go to Step 7.
If the wire between barometric pressure sensor connector
B-14 and ECM connector C-60
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.