Leak Detection Pump: Testing and Inspection

EVAPORATIVE EMISSION (EVAP) SYSTEM LEAK DETECTION PUMP INSPECTION [13B-MSP]

Resistance Inspection

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. Service and Repair













Airflow Inspection

1. Disconnect the negative battery cable.

2. Remove the EVAP system leak detection pump. Service and Repair

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. Service and Repair






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. Service and Repair
- If as specified, carry out the "Circuit Open/Short Inspection".

Circuit Open/Short Inspection

1. Disconnect the PCM connector. Service and Repair

2. Inspect the following wiring harnesses for open or short (continuity check).






Open circuit

- If there is no continuity, the circuit is open. 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 terminal C
- EVAP system leak detection pump terminal B and the body GND

Short circuit

- If there is no continuity, the circuit is shorted. 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