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DTC P2251:00 [PCM (SKYACTIV-G 2.0)]

NOTE:

  • To determine the malfunctioning part, proceed with the diagnostics from "Function Inspection Using M-MDS".

Details On DTCs

DESCRIPTION

Open circuit between A/F sensor terminal D and PCM terminal 1AB

DETECTION CONDITION

Determination conditions

  • The following conditions are met:

    • A/F sensor element impedance is specified value or more

    • A/F sensor terminal F voltage (B+ terminal) is less than specified value or unstable.

Preconditions

  • Battery voltage: 11—18 V*1

  • A/F sensor is activated.

  • The following DTCs are not detected:

    • A/F sensor terminal F voltage (B+ terminal) is less than specified value:

      • A/F sensor heater: P0031:00, P0032:00

    • A/F sensor terminal F voltage (B+ terminal) is unstable:

      • Internal PCM malfunction: P064D:00

  • *1: Value can be verified by displaying PIDs using M-MDS

Drive cycle

  • 2

Self test type

  • CMDTC self test, KOER self test

Sensor used

  • A/F sensor

FAIL-SAFE FUNCTION

  • Not applicable

VEHICLE STATUS WHEN DTCs ARE OUTPUT

  • Illuminates check engine light.

POSSIBLE CAUSE

  • A/F sensor connector or terminals malfunction

  • PCM connector or terminals malfunction

  • Open circuit in wiring harness between A/F sensor terminal D and PCM terminal 1AB

  • A/F sensor malfunction

  • PCM malfunction

System Wiring Diagram

Function Explanation (DTC Detection Outline)

  • If the PCM detects an open circuit in the wiring harness between A/F sensor terminal D and PCM terminal 1AB (COM wiring harness), it stores a DTC. In addition, when there is an open circuit in the wiring harness between A/F sensor terminal D and PCM terminal 1AB (COM wiring harness), the A/F sensor terminal F (B+ terminal) becomes unstable. At this time, the PCM determines an open circuit in the wiring harness (COM wiring harness) between A/F sensor terminal D and PCM terminal 1AB and stores a DTC.

  • If the A/F sensor does not activate, monitoring cannot occur because the A/F sensor element has an insulation property which keeps it at a specific temperature range or less.

Repeatability Verification Procedure

  • Warm up the engine to allow the engine coolant temperature to reach 80 °C {176 °F} or more.

  • Start the engine and leave it idling for 1 min.

    NOTE:

    • Match the engine coolant temperature in the recorded FREEZE FRAME DATA/snapshot data, the vehicle speed, and engine speed values to the best extent possible while driving the vehicle.

  • Try to reproduce the malfunction by driving the vehicle for 5 min based on the values in the FREEZE FRAME DATA/snapshot data.

PID Item/Simulation Item Used In Diagnosis

PID/DATA monitor item table

Item

Definition

Unit

Condition/Specification

O2S11

A/F sensor current

µA

  • Idle (after warm up): −59 µA (ECT is 92 °C {198 °F})

  • Deceleration fuel cut (accelerator pedal released from engine speed of 4,000 rpm or more): Approx. 3.48 mA (ECT is 92 °C {198 °F})

Function Inspection Using M-MDS

STEP

INSPECTION

RESULTS

ACTION

1

 PURPOSE: VERIFY RELATED REPAIR INFORMATION AVAILABILITY

  • Verify related Service Bulletins and/or on-line repair information availability.

  • Is any related repair information available?

Yes

Perform repair or diagnosis according to the available repair information.

  • If the vehicle is not repaired, go to the next step.

No

Go to the next step.

2

 PURPOSE: RECORD VEHICLE STATUS AT TIME OF DTC DETECTION TO UTILIZE WITH REPEATABILITY VERIFICATION

NOTE:

  • Recording can be facilitated using the screen capture function of the PC.

  • Record the FREEZE FRAME DATA/snapshot data on the repair order.

—

Go to the next step.

3

 PURPOSE: INSPECT A/F SENSOR CONNECTOR CONDITION

  • Switch the ignition off.

  • Disconnect the A/F sensor connector.

  • Inspect for poor connection (such as damaged/pulled-out pins, corrosion).

  • Is there any malfunction?

Yes

Replace the A/F sensor.

(See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

Go to the troubleshooting procedure to perform the procedure from Step 1.

No

Go to the next step.

4

 PURPOSE: INSPECT PCM CONNECTOR CONDITION

  • Disconnect the PCM connector.

  • Inspect for poor connection (such as damaged/pulled-out pins, corrosion).

  • Is there any malfunction?

Yes

Replace the PCM.

(See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

Go to the troubleshooting procedure to perform the procedure from Step 1.

No

Go to the next step.

5

 PURPOSE: INSPECT A/F SENSOR CIRCUIT FOR OPEN CIRCUIT

  • Verify that the A/F sensor and PCM connectors are disconnected.

  • Inspect for continuity between A/F sensor terminal D (wiring harness-side) and PCM terminal 1AB (wiring harness-side).

  • Is there continuity?

Yes

Go to the next step.

No

Refer to the wiring diagram and verify whether or not there is a common connector between A/F sensor terminal D and PCM terminal 1AB.

    If there is a common connector:

  • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.

  • Repair or replace the malfunctioning part.

    If there is no common connector:

  • Repair or replace the wiring harness which has an open circuit.

Go to the troubleshooting procedure to perform the procedure from Step 1.

6

 PURPOSE: DETERMINE INTEGRITY OF A/F SENSOR

  • Start the engine and warm it up completely.

  • Access the O2S11 PID using the M-MDS.

    (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.0)].)

  • Drive the vehicle under the following conditions.

    WARNING:

    • When the M-MDS is used to observe monitor system status while driving, be sure to have another technician with you, or record the data in the M-MDS using the PID/DATA MONITOR AND RECORD capturing function and inspect later.

    • While performing this step, always operate the vehicle in a safe and lawful manner.

    • After increasing the engine speed to 3,000 rpm, decelerate using engine braking.

  • Is the displayed PID value as follows?

    • O2S11: 0.25 mA or more

Yes

Go to the troubleshooting procedure to perform the procedure from Step 1.

No

Go to the next step.

7

 PURPOSE: INSPECT RELATED SENSOR WIRING HARNESS AND CONNECTOR

Yes

Inspect the related wiring harness and connector.

  • Repair or replace the malfunctioning part.

Go to the troubleshooting procedure to perform the procedure from Step 1.

No

Replace the A/F sensor.

(See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

Go to the troubleshooting procedure to perform the procedure from Step 1.

Troubleshooting Diagnostic Procedure

    Intention of troubleshooting procedure

  • Step 1—2

    • Verify that the primary malfunction is resolved and there are no other malfunctions.

STEP

INSPECTION

RESULTS

ACTION

1

 PURPOSE: VERIFICATION OF VEHICLE REPAIR COMPLETION

Yes

Repeat the inspection from Step 1.

Go to the next step.

No

Go to the next step.

2

 PURPOSE: VERIFY IF THERE IS ANY OTHER MALFUNCTION

  • Is any other DTC or pending code stored?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [PCM (SKYACTIV-G 2.0)].)

No

DTC troubleshooting completed.
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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

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