Leak Detection Pump: Testing and Inspection

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.
3. Remove the EVAP system leak detection pump.
4. 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.




5. 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

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 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