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2008 - MX-5 - Body and Accessories

NO. 8 TACHOMETER INDICATION IS DEFECTIVE [INSTRUMENT CLUSTER]



8

Tachometer indication is defective

POSSIBLE CAUSE

  • PCM malfunction

  • Instrument cluster malfunction

  • Connector or pin malfunction

  • Short circuit in wiring harness between CAN-L, CAN-H and GND

  • Open circuit in CAN wiring harness (CAN-L, CAN-H)

  • CAN wiring harness (CAN-L, CAN-H) short each other


Diagnostic procedure

STEP

INSPECTION

ACTION

1

  • Start the engine.

    • Does the tachometer needle move smoothly?

    • Does the tachometer needle indicate correct engine speed?

Yes

Troubleshooting completed.

No

Go to the next step.

2

  • Do the speedometer, the water temperature gauge, and the oil pressure gauge operate normally?

Yes

Go to the next step.

No

Go to Step 4.

3

  • Start the instrument cluster input/output check mode.

  • Inspect the tachometer using the check code 13.

  • Is the tachometer normal?

Yes

Inspect the PCM or connectors.

No

Replace the instrument cluster.

4

  • Start the engine.

  • Does the ABS warning light turn off?

Yes

Inspect the PCM or connectors.

No

Replace the instrument cluster.

5

  • Disconnect the negative battery cable.

  • Measure the resistance between the DLC-2 terminals F and E.

  • Is the resistance 54—66 ohms?

Yes

Go to the next step.

No

Go to Step 7.

6

  • Disconnect the negative battery cable.

  • Inspect the DLC-2 terminals F and E for short to power supply or GND.

  • Is there any malfunction?

Yes

Inspect the wiring harness and CAN system-related module.

Repair or replace the malfunctioning part.

No

Replace the instrument cluster.

7

  • Turn the ignition switch off.

  • Inspect the instrument cluster connector terminals for poor connection (such as damaged/pulled-out pins, and corrosion).

  • Are the terminals normal?

Yes

Go to the next step.

No

Repair or replace the terminal.

8

  • Disconnect the negative battery cable.

  • Measure the resistance between the instrument cluster connector terminals 1J and 1L.

  • Is the resistance 114—126 ohms?

Yes

Inspect the wiring harness and CAN system-related module.

Repair or replace the malfunctioning part.

No

Replace the instrument cluster.




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