Code No. P0108: Manifold Absolute Pressure Sensor Circuit High Input

OPERATION

• A power voltage of 5 V is applied to the manifold absolute pressure sensor power terminal from the engine-ECU connector terminal MAP5 and earthed to the engine-ECU connector terminal MAPE from the manifold absolute pressure sensor connector terminal.
  
• The sensor signal is inputted to the engine-ECU connector terminal MAP from the manifold absolute pressure sensor output terminal.
  

FUNCTION

• The manifold absolute pressure sensor converts the manifold absolute pressure into a voltage signal and inputs the signal to the engine-ECU.
  
• In response to the signal, the engine-ECU corrects the fuel injection amount, etc.
  

TROUBLE JUDGEMENT

• Battery positive voltage is 8 - 16 V
  
• 2 seconds later after the ignition switch has been in "ON" position or the engine has started up
  

• The manifold absolute pressure sensor output voltage is 4.72 V or more.
  

FAIL-SAFE AND BACKUP FUNCTION

• The pressure in the inlet manifold is controlled to be 100 kPa.
  
• The EGR control is stopped (fully closed).
  
• The fuel injection amount is restricted (output restriction).
  
• The turbocharger control is prohibited.
  
• The open angle of the accelerator pedal is restricted.
  
• The DPF regeneration is prohibited.
  
• The throttle valve is opened (electrical discontinuity).
  

PROBABLE CAUSES

• Failed manifold absolute pressure sensor
  
• Open circuit in manifold absolute pressure sensor circuit or loose connector contact
  
• Failed engine-ECU
  

	Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions).

	Go to Step 2.

	Go to Step 5.

	Go to Step 3.

	Go to Step 4.

	Repair the connector(s) or wiring harness.

	Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions).

	Replace the engine-ECU.

	Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions).

	Replace the manifold absolute pressure sensor.