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NC MX-5 Miata Workshop Manual
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2008 - MX-5 - Engine

EVAPORATIVE EMISSION (EVAP) SYSTEM LEAK DETECTION PUMP INSPECTION [LF]

NOTE:

  • Perform the following procedure only when directed.

Airflow Inspection

1. Remove the battery cover.
2. Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [LF].)
3. Remove the EVAP system leak detection pump. (See EVAPORATIVE EMISSION (EVAP) SYSTEM LEAK DETECTION PUMP REMOVAL/INSTALLATION [LF].)
4. Blow air into port A and verify that there is airflow from port B.

5. Blow air into port B and verify that there is airflow from port A.

Resistance Inspection

1. Inspect resistance of the EVAP system leak detection pump.


Terminals

Resistance (ohm)

A—B

20—50

A—C

26.6—32.4

A—D

MAX. 118

Circuit Open/Short Inspection

1. Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION [LF].)
2. Inspect the following wiring harness for open or short circuit (continuity check).

    Open circuit

  • If there is no continuity, there is an open circuit. Repair or replace the wiring harness.

    • EVAP system leak detection pump terminal C and PCM terminal 1V

    • EVAP system leak detection pump terminal D and PCM terminal 1U

    • EVAP system leak detection pump terminal A and main relay

    • EVAP system leak detection pump terminal B and body ground

    Short circuit

  • If there is continuity, there is a short circuit. Repair or replace the wiring harness.

    • EVAP system leak detection pump terminal C and body ground

    • EVAP system leak detection pump terminal D and body ground

    • EVAP system leak detection pump terminal C and power supply

    • EVAP system leak detection pump terminal D and power supply

    • EVAP system leak detection pump terminal A and body ground

    • EVAP system leak detection pump terminal B and power supply



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