Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM10000000255WU
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [09/2022 -           ]
Title: G16E-GTS (ENGINE CONTROL): SFI SYSTEM: P051A11; Crankcase Pressure Sensor "A" Circuit Low Circuit Short to Ground; 2023 - 2025 MY GR Corolla [09/2022 -        ]

DTC

P051A11

Crankcase Pressure Sensor "A" Circuit Low Circuit Short to Ground

DESCRIPTION

The internal sensor in the vacuum sensor assembly detects the air inlet duct internal pressure as a voltage.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Note

P051A11

Crankcase Pressure Sensor "A" Circuit Low Circuit Short to Ground

The output voltage from the vacuum sensor assembly is below 0.23 V for 3 seconds or more (1 trip detection logic).

  • Open or short in vacuum sensor assembly circuit
  • Vacuum sensor assembly
  • ECM

Comes on

SAE Code: P051C

HINT:

When a DTC is output, check the Data List item "PCV Pressure Sensor 1 Voltage" using the GTS.

Click here 2023 - 2025 MY GR Corolla [09/2022 -        ]; G16E-GTS (ENGINE CONTROL): SFI SYSTEM: DATA LIST / ACTIVE TEST

DTC No.

PCV Pressure Sensor 1 Voltage or PCV Pressure Sensor 2 Voltage

Malfunction

P051A11

Approximately 0 kPa [0 psi]

  • Short in PPC1 circuit to ground
  • Short in PPC1 circuit to E1PC circuit
  • Open in V1PC circuit

If the Data List displays a normal value, the normal value may be due to a temporary recovery from the malfunction condition. Check for intermittent problems.

MONITOR DESCRIPTION

The ECM calculates the air inlet duct internal pressure from the vacuum sensor assembly output voltage. If the vacuum sensor assembly output voltage is not within the normal range, there may be a malfunction in the vacuum sensor assembly or an open or short circuit. In this case, the ECM stores a DTC.

Example:

When the sensor output voltage is below 0.23 V for 3 seconds or more, the ECM stores a DTC.

MONITOR STRATEGY

Related DTCs

P051C: Vacuum sensor assembly range check (low voltage)

Required Sensors/Components (Main)

Vacuum sensor assembly

Required Sensors/Components (Related)

-

Frequency of Operation

Continuous

Duration

3 seconds

MIL Operation

Immediate

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever the following DTCs are not stored

None

All of the following conditions are met

-

Battery voltage

8 V or higher

Ignition switch

ON

Starter

Off

TYPICAL MALFUNCTION THRESHOLDS

Vacuum sensor assembly voltage

Below 0.23 V (Below 51 kPa [7.395 psi])

CONFIRMATION DRIVING PATTERN

HINT:

  • After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

    Click here 2023 - 2025 MY GR Corolla [09/2022 -        ]; G16E-GTS (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR

  • When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

    Click here 2023 - 2025 MY GR Corolla [09/2022 -        ]; G16E-GTS (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR

  1. Connect the GTS to the DLC3.
  2. Turn the ignition switch to ON and turn the GTS on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the ignition switch off and wait for at least 30 seconds.
  5. Turn the ignition switch to ON and turn the GTS on.
  6. Start the engine and wait 5 seconds or more [A].
  7. Enter the following menus: Powertrain / Engine / Trouble Codes [B].
  8. Read the pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
  9. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
  10. Input the DTC: P051A11.
  11. Check the DTC judgment result.

    GTS Display

    Description

    NORMAL

    • DTC judgment completed
    • System normal

    ABNORMAL

    • DTC judgment completed
    • System abnormal

    INCOMPLETE

    • DTC judgment not completed
    • Perform driving pattern after confirming DTC enabling conditions

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • [A] to [B]: Normal judgment procedure.

      The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

    • When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

HINT:

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.

CHECK HARNESS AND CONNECTOR

HINT:

Make sure that the connector is properly connected. If it is not, securely connect it and check for DTCs again.

(a) Disconnect the vacuum sensor assembly connector.

(b) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

C159-3 (VC) - C159-1 (E2)

Ignition switch ON

4.5 to 5.5 V

C159-2 (PPC1) - C159-1 (E2)

Ignition switch ON

3.0 to 5.5 V

*a

Front view of wire harness connector

(to Manifold Absolute Pressure Sensor)

(d) Turn the ignition switch off and wait for at least 30 seconds.

(e) None

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C159-3 (VC) - C159-2 (PPC1)

Ignition switch off

171 to 189 kΩ

OK

REPLACE VACUUM SENSOR ASSEMBLY

NG

2.

CHECK HARNESS AND CONNECTOR (VACUUM SENSOR ASSEMBLY - ECM)

(a) Disconnect the vacuum sensor assembly connector.

(b) Disconnect the ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C159-3 (VC) - C143-34 (V1PC)

Always

Below 1 Ω

C159-2 (PPC1) or C143-44 (PPC1) - Body ground and other terminals

Always

10 kΩ or higher

OK

REPLACE ECM 2023 MY GR Corolla [09/2022 - 11/2022]; G16E-GTS (ENGINE CONTROL): ECM: REMOVAL 2023 - 2025 MY GR Corolla [11/2022 -        ]; G16E-GTS (ENGINE CONTROL): ECM: REMOVAL

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR