Leak Detection Pump: Testing and Inspection
EVAPORATIVE EMISSION (EVAP) SYSTEM LEAK DETECTION PUMP INSPECTIONAirflow Inspection
NOTE: Perform the following test only when directed.
1. Disconnect the negative battery cable.
2. Remove the EVAP system leak detection pump.
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.
2. Inspect the following wiring harnesses for an 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 3V
- EVAP system leak detection pump terminal D and PCM terminal 3Y
- EVAP system leak detection pump terminal A and main relay terminal C
- EVAP system leak detection pump terminal B and the 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 power supply
- EVAP system leak detection pump terminal D and power supply
- EVAP system leak detection pump terminal A and the body Ground
- EVAP system leak detection pump terminal B and power supply