SFI SYSTEM, Diagnostic DTC:P1108

DTC Code DTC Name
P1108 Manifold Absolute Pressure Sensor AD Too High

DESCRIPTION

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P1108 Manifold Absolute Pressure Sensor AD Too High

DTC Detection Condition


    Enable Criteria

  • Engine running


    Malfunction Criteria

  • High voltage, out of range 3.666 V (195.1 kPa) or higher


    Diagnostic Mask

  • The MIL will be illuminated if a fault is present for 2 consecutive trips


    Monitor

  • Continuous


    Potential failure modes

  • -

  • Open or short in manifold absolute pressure sensor circuit

  • Wire harness or connector

  • Manifold absolute pressure sensor

  • ECM

 Comes on DTC stored

MONITOR DESCRIPTION

The ECM monitors the sensor voltage and uses this value to calculate the manifold absolute pressure. When the sensor output voltage deviates from the normal operating range, the ECM interprets this as a malfunction in the manifold pressure sensor and stores the DTC.

Example:

When the sensor output voltage is less than 0.5 V, or higher than 4.5 V for 0.5 seconds or more, the ECM stores the DTC.

WIRING DIAGRAM

Refer to DTC P0102.

Click here

CAUTION / NOTICE / HINT

Tech Tips

Read freeze frame data using the GTS. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE


  1. READ VALUE USING GTS (MAP)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Data List / MAP.

    5. Read the MAP value.

      OK
      Same value as the actual atmospheric pressure

      Tech Tips


      • Standard atmospheric pressure is 101 kPa(abs) [758 mmHg(abs)]. For every 100 m (328 ft.) increase in altitude, atmospheric pressure drops by approximately 1 kPa (7.5 mmHg). The pressure also varies due to the weather (high atmospheric pressure, low atmospheric pressure).

      • Also, check "Atmosphere Pressure" in the Data List.

      Result
      Proceed to
      OK
      NG

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

    NG

  2. CHECK TERMINAL VOLTAGE (POWER SOURCE OF VACUUM SENSOR (MAINFOLD ABSOLUTE PRESSURE SENSOR))

    B00455GC01
    *a

    Front view of wire harness connector

    (to Vacuum Sensor (Mainfold Absolute Pressure Sensor))

    1. Disconnect the vacuum sensor (manifold absolute pressure sensor) connector.

    2. Turn the engine switch on (IG).

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      B134-3 (VC) - B134-1 (E) Engine switch on (IG) 4.5 to 5.5 V
      B134-4 (PIM) - B134-1 (E) Engine switch on (IG) 4.0 to 5.0 V
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (ECM - VACUUM SENSOR (MAINFOLD ABSOLUTE PRESSURE SENSOR)) Click here

    OK

  3. REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR


    1. Replace the manifold absolute pressure sensor.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  4. CHECK WHETHER DTC OUTPUT RECURS (DTC P1108)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTC.

    5. Turn the engine switch off and wait for at least 30 seconds.

    6. Turn the engine switch on (IG).

    7. Turn the GTS on.

    8. Enter the following menus: Powertrain / Engine / Trouble Codes.

    9. Read the DTCs.

      Result
      Result Proceed to
      DTC is not output A
      DTC P0108 is output B

    A

    END

    B

    REPLACE ECM Click here

  5. CHECK HARNESS AND CONNECTOR (ECM - VACUUM SENSOR (MAINFOLD ABSOLUTE PRESSURE SENSOR))


    1. Disconnect the B142 ECM connector.

    2. Disconnect the B134 vacuum sensor (mainfold absolute pressure sensor) connector.

    3. Disconnect the A117 mass air flow meter connector.

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      B142-45 (VCPM) - B134-3 (VC) Always Below 1 Ω
      B142-4 (PIM) - B134-4 (PIM) Always Below 1 Ω
      B142-9 (E2) - B134-1 (E) Always Below 1 Ω
      B142-45 (VCPM) or B134-3 (VC) - Body ground and other terminals Always 10 kΩ or higher
      B142-4 (PIM) or B134-4 (PIM) - Body ground and other terminals Always 10 kΩ or higher
      B142-9 (E2) or B134-1 (E) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR