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. (See EVAPORATIVE EMISSION (EVAP) SYSTEM LEAK DETECTION PUMP 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 test 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
Open circuit
- If there is no continuity, the circuit is open. Repair or replace the harness.
- EVAP system leak detection pump terminal C (harness-side) and PCM terminal 4AH
- EVAP system leak detection pump terminal D (harness-side) and PCM terminal 3K
- EVAP system leak detection pump terminal A (harness-side) and main relay terminal D (harness-side)
- EVAP system leak detection pump terminal B (harness-side) and the body GND
Short circuit
- If there is continuity, the circuit is shorted. Repair or replace the harness.
- EVAP system leak detection pump terminal C (harness-side) and power supply
- EVAP system leak detection pump terminal D (harness-side) and power supply
- EVAP system leak detection pump terminal A (harness-side) and the body GND
- EVAP system leak detection pump terminal B (harness-side) and power supply