SFI SYSTEM, Diagnostic DTC:P1181 and P1182

DTC Code DTC Name
P1181 Mastervac Pressure Gradient Default
P1182 Consistency Default of the Mastervac Vacuum Sensor

DESCRIPTION

The vacuum sensor assembly detects the brake booster pressure as a change in voltage. The ECM calculates the brake booster pressure based on this voltage.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

P1181

Mastervac Pressure Gradient Default

Change in vacuum sensor assembly signal is outside threshold.

  • Vacuum sensor assembly (brake booster pressure sensor)

  • Wire harness or connector

  • Intake system

  • ECM

Comes on

DTC stored

P1182

Consistency Default of the Mastervac Vacuum Sensor

Output voltage from vacuum sensor assembly is higher than threshold.

  • Vacuum sensor assembly (brake booster pressure sensor)

  • Wire harness or connector

  • ECM

Comes on

DTC stored

MONITOR DESCRIPTION

These DTCs are stored when a malfunction is detected in the vacuum sensor assembly (brake booster pressure sensor) circuit. If the vacuum sensor assembly (brake booster pressure sensor) value does not change or the amount of change in the output voltage is outside of the threshold, the ECM will illuminate the MIL and store a DTC.

WIRING DIAGRAM

A330032E05

PROCEDURE

  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P1181 AND P1182)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

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

    5. Check for DTCs.

      Powertrain > Engine > Trouble Codes

    Result

    Result

    Proceed to

    DTC P1181 and/or P1182 is output

    A

    DTC P1181 and/or P1182 and other DTCs are output

    B
    Tip:

    If DTC P1181 and/or P1182 and P0444, P0445 or P0658 are output simultaneously, troubleshoot for DTC P0444, P0445 or P0658 first.

    B

    GO TO DTC CHART

    Click here

    A

  2. READ VALUE USING GTS (MASTERVAC VACUUM PRESSURE)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Data List / Mastervac Vacuum Pressure.

      Powertrain > Engine > Data List

      Tester Display

      Mastervac Vacuum Pressure

    5. Start the engine and read the values.

      OK

      The value is 45 kPa when the engine is idling and changes when the brake pedal is depressed and released several times.

    Result

    Proceed to

    OK

    NG
    NG

    CHECK HARNESS AND CONNECTOR (VACUUM SENSOR ASSEMBLY - ECM)Click here

    OK

  3. READ VALUE USING GTS (MASTERVAC VACUUM PRESSURE)

    1. Stop the engine.

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the GTS on.

    5. Enter the following menus: Powertrain / Engine / Data List / Mastervac Vacuum Pressure.

      Powertrain > Engine > Data List

      Tester Display

      Mastervac Vacuum Pressure

    6. According to the display on the GTS, read the Data List after waiting for 5 minutes or more with the engine stopped.

      OK

      The value does not increase.

      Tip:

      • Do not depress the brake pedal after stopping the engine.

      • If the value increases, there may be air leaks in the brake booster or brake vacuum system.

    Result

    Proceed to

    OK

    NG
    OK

    CHECK FOR INTERMITTENT PROBLEMS

    Click here

    NG

    CHECK BRAKE SYSTEM

    Click here

  4. CHECK HARNESS AND CONNECTOR (VACUUM SENSOR ASSEMBLY - ECM)

    1. Disconnect the vacuum sensor assembly connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      A15-1 (E2) - A35-48 (BRE2)

      Always

      Below 1 Ω

      A15-2 (PB) - A35-37 (PB)

      Always

      Below 1 Ω

      A15-3 (VC) - A35-24 (BRCV)

      Always

      Below 1 Ω

      A15-1 (E2) or A35-48 (BRE2) - Body ground and other terminals

      Always

      10 kΩ or higher

      A15-2 (PB) or A35-37 (PB) - Body ground and other terminals

      Always

      10 kΩ or higher

      A15-3 (VC) or A35-24 (BRCV) - Body ground and other terminals

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. REPLACE VACUUM SENSOR ASSEMBLY

    1. Replace the vacuum sensor assembly.

      for LHD:Click here

      for RHD:Click here

    Result

    Proceed to

    NEXT
    NEXT

  6. CHECK WHETHER DTC OUTPUT RECURS (DTC P1181 OR P1182)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs.

      Powertrain > Engine > Clear DTCs

    5. Turn the ignition switch off and wait for a few minutes.

    6. Perform the drive test.

    7. Turn the GTS on.

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

    9. Check for DTCs.

      Powertrain > Engine > Trouble Codes

      Result

      Result

      Proceed to

      DTC P1181 or P1182 is output

      A

      DTCs are not output

      B
    A

    REPLACE ECM

    Click here

    B

    END