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DTC P0107: Manifold Absolute Pressure Circuit Low Input
 
 
 
 
CIRCUIT OPERATION
  • A 5-volt voltage is supplied to the manifold absolute pressure sensor power terminal from the ECM terminal 5V. The manifold absolute pressure sensor ground terminal is grounded with ECM terminal SENG.
  • A voltage that is proportional to the intake manifold pressure is sent to the ECM terminal MAP from the manifold absolute pressure sensor output terminal.
 
 
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 stored 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 less than 0°C (32°F).
  • Volumetric efficiency is more than 20 percent.
Judgment Criterion
  • Manifold absolute pressure sensor output voltage is less than 0.2 volt [corresponding to a manifold absolute pressure of 5 kPa (1.5 in.Hg)] for 2 seconds.
 
 
FAIL-SAFE AND BACKUP FUNCTION
  • Control as if the intake manifold vacuum pressure is 101 kPa (29.8 in.Hg).
 
 
OBD-II DRIVE CYCLE PATTERN
  • Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 6 .
 
 
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
  • Manifold absolute pressure sensor failed.
  • Open or shorted manifold absolute pressure sensor circuit, harness damage 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
  • MB991958: Scan Tool (M.U.T.-III Sub Assembly)
    • MB991824: Vehicles Communication Interface (V.C.I.)
    • MB991827: M.U.T.-III USB Cable
    • MB991910: M.U.T.-III Main Harness A (Vehicles with CAN communication system)
STEP 1. Using scan tool (M.U.T.-III), check data list item 8: Manifold Absolute Pressure Sensor.
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).
(1) Connect scan tool (M.U.T.-III). Refer to HOW TO CONNECT THE SCAN TOOL (M.U.T.-III) .
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool (M.U.T.-III) to the data reading mode for item 8, Manifold Absolute 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) Start the engine.
  • Warm up the engine. When the engine is idling, 22 - 42 kPa (6.5 - 12.4 in.Hg).
  • When the engine is suddenly revved, manifold absolute pressure varies.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Is the sensor operating properly?
It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions .
Go to Step 2.
 
STEP 2. Measure the sensor supply voltage at manifold absolute pressure sensor connector by backprobing.
(1) Do not disconnect the manifold absolute pressure sensor connector.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 5V line and ground by backprobing.
  • Voltage should be between 4.9 and 5.1 volts.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the measured voltage between 4.9 and 5.1 volts?
Go to Step 5.
Go to Step 3.
 
STEP 3. Measure the sensor supply voltage at ECM connector by backprobing.
(1) Do not disconnect the connector.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 5V and ground by backprobing.
  • Voltage should be between 4.9 and 5.1 volts.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the measured voltage between 4.9 and 5.1 volts?
Repair or replace the connector(s), or check and repair the harness of open circuit in 5V line between manifold absolute pressure sensor connector and ECM connector. Then go to Step 8.
Go to Step 4.
 
STEP 4. Check of short circuit to ground in 5V line between manifold absolute pressure sensor connector and ECM connector.
Is the harness wire in good condition?
Go to Step 7.
Repair the connector(s) or wiring harness. Then go to Step 8.
 
STEP 5. Measure the sensor output voltage at ECM connector by backprobing.
(1) Do not disconnect the connector.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 45 and ground by backprobing.
  • When altitude is 0 m (0 foot), voltage should be between 3.8 and 4.2 volts.
  • When altitude is 600 m (1,969 feet), voltage should be between 3.5 and 3.9 volts.
  • When altitude is 1,200 m (3,937 feet), voltage should be between 3.3 and 3.7 volts.
  • When altitude is 1,800 m (5,906 feet), voltage should be between 3.0 and 3.4 volts.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the measured voltage normal?
Go to Step 7.
Go to Step 6.
 
STEP 6. Check of open circuit and short circuit to ground in MAP line between manifold absolute pressure sensor connector and ECM connector.
Is the harness wire in good condition?
Replace the manifold absolute pressure sensor. Then go to Step 8.
Repair the connector(s) or wiring harness. Then go to Step 8.
 
STEP 7. Using scan tool (M.U.T.-III), check data list item 8: Manifold Absolute Pressure Sensor.
(1) Turn the ignition switch to the "ON" position.
(2) Set scan tool (M.U.T.-III) to the data reading mode for item 8, Manifold Absolute 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).
(3) Start the engine.
  • Warm up the engine. When the engine is idling, 22 - 42 kPa (6.5 - 12.4 in.Hg).
  • When the engine is suddenly revved, manifold absolute pressure varies.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the sensor operating properly?
It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions .
Replace the ECM (Refer to, Removal and Installation ). 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 Diagnostic Function - OBD-II Drive Cycle - Pattern 6 .
(2) Check the diagnostic trouble code (DTC).
Is DTC P0107 set?
Retry the troubleshooting.
The inspection is complete.