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. Remove the EVAP system leak detection pump.
2. 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.




3. 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. 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.
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 1AJ
- EVAP system leak detection pump terminal D and PCM terminal 1AF
- EVAP system leak detection pump terminal A and main relay terminal
- 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