Leak Detection Pump: Testing and Inspection

EVAPORATIVE EMISSION (EVAP) SYSTEM LEAK DETECTION PUMP INSPECTION

Airflow Inspection

NOTE: Perform the following test only when directed.

1. Disconnect the negative battery cable.
2. Remove the EVAP system leak detection pump. (See EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM COMPONENT REMOVAL/INSTALLATION.)




3. Blow air into port A and verify that there is airflow from port B.
- If not as specified, replace the EVAP system leak detection pump.

4. Blow air into port B and verify that there is airflow from port A.
- If not as specified, replace the EVAP system leak detection pump.
- If as specified, perform the following "Resistance Inspection".

Resistance Inspection

NOTE: Perform the following procedure only when directed.

1. Disconnect the negative battery cable.







2. Inspect resistance of the EVAP system leak detection pump.
- If not as specified, replace the EVAP system leak detection pump.
- If as specified, carry out the "Circuit Open/Short Inspection".

Circuit Open/Short Inspection




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




California emission regulation applicable ATX model




Except for California emission regulation applicable ATX model


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 32*1, 3V*2
- EVAP system leak detection pump terminal D and PCM terminal 94*1, 3Y*2
- EVAP system leak detection pump terminal A and main relay terminal C
- EVAP system leak detection pump terminal B and the body GND

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 power supply
- EVAP system leak detection pump terminal D and power supply
- EVAP system leak detection pump terminal A and the body GND
- EVAP system leak detection pump terminal B and power supply

*1 : California emission regulation applicable ATX model
*2 : Except for California emission regulation applicable ATX model