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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 MAP5. The ground terminal is grounded with ECM terminal MAPE.
  • A voltage that is proportional to the intake manifold pressure is sent to the ECM terminal MAPE 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 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.
  • Volumetric efficiency is 20 percent or higher.
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 lower 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
  • Fuel control is carried out using engine speed and air flow rate in accordance with preset map.
 
 
OBD-II DRIVE CYCLE PATTERN
  • Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1 .
 
 
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 Tool:
  • MB992110: Power Plant ECU Check Harness
STEP 1. Using scan tool (M.U.T.-IIISE), check data list item 8: Manifold Absolute Pressure Sensor.
cautionTo prevent damage to scan tool (M.U.T.-IIISE), always turn off the power supply mode of the electric motor switch before connecting or disconnecting scan tool (M.U.T.-IIISE).
(1) Connect scan tool (M.U.T.-IIISE). Refer to HOW TO CONNECT THE SCAN TOOL (M.U.T.-IIISE) .
(2) Turn on the power supply mode of the electric motor switch.
(3) Set scan tool (M.U.T.-IIISE) 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) Set the vehicle to the continuous idling mode, and warm up the engine.
  • The standard value should be 28.3 - 41.7 kPa (8.36 - 12.31 in.Hg).
  • When the engine is suddenly revved, manifold absolute pressure varies.
(5) Turn off the power supply mode of the electric motor switch.
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.
(1) Disconnect the manifold absolute pressure sensor connector and measure at the harness side.
(2) Turn on the power supply mode of the electric motor switch.
(3) Measure the voltage between terminal MAP5 and ground.
  • Voltage should be between 4.9 and 5.1 volts.
(4) Turn off the power supply mode of the electric motor switch.
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 using power plant ECU check harness special tool MB992110.
(1) Disconnect the manifold absolute pressure sensor connector.
(2) Disconnect all ECM connectors. Connect the power plant ECU check harness special tool MB992110 between the separated connectors.
(3) Turn on the power supply mode of the electric motor switch.
(4) Measure the voltage between terminal MAP5 and ground.
  • Voltage should be between 4.9 and 5.1 volts.
(5) Turn off the power supply mode of the electric motor switch.
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 MAP5 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 MAP5 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 using power plant ECU check harness special tool MB992110.
(1) Disconnect all ECM connectors. Connect the power plant ECU check harness special tool MB992110 between the separated connectors.
(2) Turn on the power supply mode of the electric motor switch.
(3) Measure the voltage between terminal MAP and ground.
  • 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 off the power supply mode of the electric motor switch.
Is the measured voltage normal?
Go to Step 7.
Go to Step 6.
 
STEP 6. Check of short to ground and open circuit 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.-IIISE), check data list item 8: Manifold Absolute Pressure Sensor.
(1) Turn on the power supply mode of the electric motor switch.
(2) Set scan tool (M.U.T.-IIISE) 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) Set the vehicle to the continuous idling mode, and warm up the engine.
  • The standard value should be 28.3 - 41.7 kPa (8.36 - 12.31 in.Hg).
  • When the engine is suddenly revved, manifold absolute pressure varies.
(4) Turn off the power supply mode of the electric motor switch.
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 1 .
(2) Check the diagnostic trouble code (DTC).
Is DTC P0107 set?
Retry the troubleshooting.
The inspection is complete.