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DTC P0108-00: Manifold Absolute Pressure Sensor circuit high input
 
 
 
 
CIRCUIT OPERATION
  • A power voltage of 5 volts is applied to the manifold absolute pressure sensor connector terminal number 3 from the ECM connector terminal number 31.
  • The power voltage is grounded to the ECM connector terminal number 41 from the manifold absolute pressure sensor connector terminal number 2.
  • The sensor signal is inputted to the ECM connector terminal number 42 from the manifold absolute pressure sensor connector terminal number 1.
 
 
TECHNICAL DESCRIPTION
  • The manifold absolute pressure sensor outputs a voltage which corresponds to the intake manifold pressure.
  • The ECM checks whether this voltage is within a specified range.
 
 
DESCRIPTIONS OF MONITOR METHODS
Manifold absolute pressure sensor output voltage is out of specified range.
 
 
MONITOR EXECUTION
Continuous.
 
 
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)
Other Monitor (There is no temporary DTC set in memory for the item monitored below)
  • Not applicable
Sensor (The sensor below is determined to be normal)
  • Mass airflow sensor
  • Engine coolant temperature sensor
  • Intake air temperature sensor
  • Barometric pressure sensor
  • Throttle position sensor
 
 
DTC SET CONDITIONS
Logic Flow Chart
Check Conditions
  • More than 8 minutes have passed since the engine starting sequence was completed, when the engine coolant temperature at engine start is 0°C (32°F) or lower.
    or
  • More than 2 seconds have passed since the key-off evaporative leakage monitoring was started.
  • Engine coolant temperature is higher than 5°C (41°F).
Judgment Criterion
  • Manifold absolute pressure sensor output voltage has continued to be higher than 4.6 volts [corresponding to a manifold absolute pressure of 117 kPa (34.6 in.Hg)] for 2 seconds.
 
 
FAIL-SAFE AND BACKUP FUNCTION
Carry out the fuel control by estimating the intake manifold pressure from throttle opening degree and a normal sensor.
 
 
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function, OBD-II Drive Cycle – Pattern 1 OBD- II DRIVE CYCLE.
 
 
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
  • Manifold absolute pressure sensor failed.
  • Open or harness damage in manifold absolute pressure sensor circuit or connector damage.
  • ECM failed.
 
 
DIAGNOSIS
Required Special Tools:
  • MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
  • MB992745: V.C.I.-Lite main harness A
  • MB992747: V.C.I.-Lite USB cable short
  • MB992748: V.C.I.-Lite USB cable long
1.STEP 1. Using scan tool (M.U.T.-III SE), check the data list.
Use scan tool (M.U.T.-III SE) to check the data list (Refer to DATA LIST REFERENCE TABLE).
  • Item number 70: Boost Sensor
Q: Is the check result normal?
 
2.STEP 2. Perform resistance measurement at manifold absolute pressure sensor connector terminal number 2.
  • Disconnect connector, and measure at harness side.
  • Resistance between manifold absolute pressure sensor connector terminal number 2 and ground.
OK: Continuity (2 ohms or less)
Q: Is the check result normal?
 
3.STEP 3. Check harness between manifold absolute pressure sensor connector terminal number 2 and ECM connector terminal number 41.
Check ground line for open circuit and damage.
Q: Is the check result normal?
Repair or replace the connector, or repair the damaged harness wire.
 
4.STEP 4. Using scan tool (M.U.T.-III SE), check the data list.
Use scan tool (M.U.T.-III SE) to check the data list (Refer to DATA LIST REFERENCE TABLE).
  • Item number 70: Boost Sensor
Q: Is the check result normal?
Replace the ECM (Refer to ENGINE CONTROL MODULE (ECM) REMOVAL AND INSTALLATION).
 
5.STEP 5. Using scan tool (M.U.T.-III SE), check the data list.
Use scan tool (M.U.T.-III SE) to check the data list (Refer to DATA LIST REFERENCE TABLE).
  • Item number 70: Boost Sensor
Q: Is the check result normal?
Replace the manifold absolute pressure sensor (Refer to ENGINE, Intake and Exhaust – Intake Manifold INTAKE MANIFOLD REMOVAL AND INSTALLATION). Then
 
6.STEP 6. Test the OBD-II drive cycle.
After erasing the DTC, carry out test drive with the drive cycle pattern, and recheck the DTC.
(1) Use scan tool (M.U.T.-III SE) to erase the DTC.
(2) Carry out test drive with the drive cycle pattern (Refer to Diagnostic Function, OBD-II Drive Cycle – Pattern 1 OBD- II DRIVE CYCLE).
(3) Use scan tool (M.U.T.-III SE) to recheck the DTC.
Q: Is DTC P0108-00 set?
Replace the ECM (Refer to ENGINE CONTROL MODULE (ECM) REMOVAL AND INSTALLATION).
Intermittent malfunction (Refer to GENERAL INFORMATION, General Information – How to Use Troubleshooting/Inspection Service Points – How to Cope with Intermittent Malfunctions HOW TO COPE WITH INTERMITTENT MALFUNCTIONS).
 
7.STEP 7. Test the OBD-II drive cycle.
After erasing the DTC, carry out test drive with the drive cycle pattern, and recheck the DTC.
(1) Use scan tool (M.U.T.-III SE) to erase the DTC.
(2) Carry out test drive with the drive cycle pattern (Refer to Diagnostic Function, OBD-II Drive Cycle – Pattern 1 OBD- II DRIVE CYCLE).
(3) Use scan tool (M.U.T.-III SE) to recheck the DTC.
Q: Is DTC P0108-00 set?
Replace the ECM (Refer to ENGINE CONTROL MODULE (ECM) REMOVAL AND INSTALLATION).
The inspection is complete.