Leak Detection Pump: Testing and Inspection

EVAPORATIVE EMISSION (EVAP) SYSTEM LEAK DETECTION PUMP INSPECTION [L3]

Airflow Inspection

NOTE: Perform the following test only when directed.

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

NOTE: Perform the following procedure only when directed.

1. Remove the battery cover.
2. Disconnect the negative battery cable
3. 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 [L3]
1. Disconnect the PCM connector.




2. Inspect the following wiring harnesses 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 A and main relay terminal C
- EVAP system leak detection pump terminal B and the body ground
- EVAP system leak detection pump terminal C and PCM terminal 1L
- EVAP system leak detection pump terminal D and PCM terminal 1x

Short circuit
- If there is continuity, there is a short circuit.
Repair or replace the wiring harness.
- EVAP system leak detection pump terminal A and the body ground
- EVAP system leak detection pump terminal B and power supply
- EVAP system leak detection pump terminal C and power supply
- EVAP system leak detection pump terminal C and body ground
- EVAP system leak detection pump terminal D and power supply
- EVAP system leak detection pump terminal D and body ground