ECD SYSTEM, Diagnostic DTC:P0236, P0237, P0238

DTC Code DTC Name
P0236 MAP Sensor Gradient Test
P0237 Short to GND in MAP Sensor Circuit
P0238 Open or Short to B+ in MAP Sensor Circuit

DESCRIPTION

The turbo pressure sensor detects the intake manifold pressure by using the built-in sensor unit. The ECM determines the basic injection duration and injection advance timing based on the voltage output from the turbo pressure sensor.

DTC No. DTC Detection Condition Trouble Area Possible to Detect
Ignition Switch Engine Run
P0236

The output from the turbo pressure sensor suddenly changes.

(3 trip detection logic)

  • Turbo pressure sensor

  • Turbo pressure sensor circuit

  • ECM

 ON ON
P0237

The output voltage from the turbo pressure sensor is less than 0.95 V (less than 60 kPa (600 mbars, 8.7 psi)) for 1 sec. or more.

(3 trip detection logic)

  • Turbo pressure sensor

  • Turbo pressure sensor circuit

  • ECM

 ON ON
P0238

The output voltage from the turbo pressure sensor is more than 4.75 V (more than 250 kPa (2,500 mbars, 36.3 psi)) for 1 sec. or more.

(3 trip detection logic)

  • Turbo pressure sensor

  • Turbo pressure sensor circuit

  • ECM

 ON ON

FAIL-SAFE

DTC No. Fail-safe Operation Fail-safe Deactivation Condition
P0236 Intake manifold pressure is maintained at 90 kPa (900 mbars, 13.1 psi). Normal condition is restored.
P0237 Intake manifold pressure is maintained at 90 kPa (900 mbars, 13.1 psi). Normal condition is restored.
P0238 Intake manifold pressure is maintained at 90 kPa (900 mbars, 13.1 psi). Normal condition is restored.

WIRING DIAGRAM

A0137MWE01

INSPECTION PROCEDURE

Tech Tips


  • When DTC P0236, P0237 or P0238 is detected, check the pressure by selecting the following menu items on the intelligent tester: Powertrain / Engine and ECT / Data List / MAP.

  • If the ECM is replaced, variant coding (variant coding indicates the presence of vehicle accessory items, A/C, etc.) should always be performed Click here.

  • Before removing the ECM and the peripheral parts, wait at least 3 minute after turning the ignition switch off (If the cooling fan is operating, remove the ECM and the peripheral parts after the fan stops.).

PROCEDURE


  1. READ VALUE OF INTELLIGENT TESTER (TURBO PRESSURE)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to the ON position and turn the intelligent tester on.

    3. Select the following menu items: Powertrain / Engine and ECT / MAP.

    4. Read the value.

      Result
      Display (DTC output) Proceed To
      Except 60 to 250 kPa (600 to 2,500 kPa, 8.7 to 36.3 psi), or pressure value fluctuates. A
      60 to 250 kPa (600 to 2,500 kPa, 8.7 to 36.3 psi) and pressure value does not fluctuate. B

    B

    CHECK FOR INTERMITTENT PROBLEMS

    A

  2. INSPECT ECM (VOLTAGE)


    1. A0137OJE01

      Disconnect the B41 turbo pressure sensor connector.

    2. Turn the ignition switch to the ON position.

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

      Standard voltage
      Tester Connection Specified Condition
      VPIM (B41-1) - Body ground 4.7 to 5.3 V

    NG

    CHECK HARNESS AND CONNECTOR (TURBO PRESSURE SENSOR - ECM) Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (TURBO PRESSURE SENSOR - ECM)


    1. A0136T0E01

      Disconnect the B53 and B54 ECM connectors.

    2. Disconnect the B41 turbo pressure sensor connector.

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

      Standard resistance
      Check for open
      Tester Connection Specified Condition
      PIM (B54-5) - PIM (B41-3) Below 1 Ω
      EPIM (B53-22) - EPIM (B41-2) Below 1 Ω
      Check for short
      Tester Connection Specified Condition
      PIM (B54-5) or PIM (B41-3) - Body ground 10 kΩ or higher
      EPIM (B53-22) or EPIM (B41-2) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. REPLACE TURBO PRESSURE SENSOR


    NEXT

  5. CHECK IF DTC RECURS (P0236, P0237 AND/OR P0238)


    1. Connect the intelligent tester to the DLC3.

    2. Clear the DTC Click here.

    3. Turn the ignition switch to the ON position and turn the intelligent tester on.

    4. Select the following menu items: Powertrain / Engine and ECT / DTC.

    5. Read the DTCs displayed on the intelligent tester.

      Result
      Display (DTC output) Proceed To
      No output A
      DTC P0236, P0237 and/or P0238 B

    B

    REPLACE ECM

    A

    END

  6. CHECK HARNESS AND CONNECTOR (TURBO PRESSURE SENSOR - ECM)


    1. A0136DKE01

      Disconnect the B53 ECM connector.

    2. Disconnect the B41 turbo pressure sensor connector.

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

      Standard resistance
      Check for open
      Tester Connection Specified Condition
      VPIM (B53-11) - VPIM (B41-1) Below 1 Ω
      Check for short
      Tester Connection Specified Condition
      VPIM (B53-11) or VPIM (B41-1) - Body ground 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM