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NO.2 CHECK ENGINE LIGHT ILLUMINATES [SKYACTIV-G 2.0]

2

CHECK ENGINE LIGHT ILLUMINATES

DESCRIPTION

  • Check engine light illuminates incorrectly.

NOTE:

  • If there is a malfunction in the engine system, the PCM stores a DTC and illuminates the check engine light.

POSSIBLE CAUSE

  • Check engine light illuminates for emission-related concern (DTC is stored in PCM)

  • Short to ground in wiring harness between the following terminals:

    • Instrument cluster terminal B—BCM terminal 2D

    • Instrument cluster terminal D—BCM terminal 2C

    • BCM terminal 3C—PCM terminal 2AK

    • BCM terminal 3D—PCM terminal 2AL

  • Open circuit in wiring harness between the following terminals:

    • Instrument cluster terminal B—BCM terminal 2D

    • Instrument cluster terminal D—BCM terminal 2C

    • BCM terminal 3C—PCM terminal 2AK

    • BCM terminal 3D—PCM terminal 2AL

  • Instrument cluster malfunction

Diagnostic Procedure

STEP

INSPECTION

RESULTS

ACTION

1

VERIFY PCM DTC
  • Retrieve any DTCs using the M-MDS.

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

  • Are any DTCs present?

Yes

Go to the applicable DTC inspection.

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

No

Go to the next step.

2

INSPECT COMMUNICATION LINE BETWEEN PCM AND INSTRUMENT CLUSTER
  • Inspect for a short or open circuit between the following terminals:

    • Instrument cluster terminal B—BCM terminal 2D

    • Instrument cluster terminal D—BCM terminal 2C

    • BCM terminal 3C—PCM terminal 2AK

    • BCM terminal 3D—PCM terminal 2AL

  • Is the wiring harness normal?

Yes

Inspect the instrument cluster.

(See INSTRUMENT CLUSTER INSPECTION.)

  • If there is any malfunction:

    • Repair or replace the malfunctioning part according to the inspection results, then go to the next step.

      (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)

No

Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:

  • Instrument cluster terminal B—BCM terminal 2D

  • Instrument cluster terminal D—BCM terminal 2C

  • BCM terminal 3C—PCM terminal 2AK

  • BCM terminal 3D—PCM terminal 2AL

    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 a short to ground or open circuit.

  • Repair or replace the malfunctioning part.

    If there is no common connector:
  • Repair or replace the wiring harness which has a short to ground or open circuit.

3

Verify the test results.

  • If normal, return to the diagnostic index to service any additional symptoms.

    (See SYMPTOM DIAGNOSTIC INDEX [SKYACTIV-G 2.0].)

  • If the malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis.

    • If the vehicle is repaired, troubleshooting is completed.

    • If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later calibration is available. Retest.

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

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