EVAP Leak Check Pressure Sensor (combine with BARO sensor) check

Reference: EVAP LEAK CHECK MODULE REMOVAL AND INSTALLATION 

Check barometric pressure and reference vacuum pressure as follows.

1. Initial (barometric) pressure check:
   1. Arrange 3 new 1.5 V batteries (1) in series and connect its positive terminal to terminal "4" for EVAP leak check pressure sensor of EVAP leak check module and negative terminal "2".
   2. Check EVAP leak check pressure sensor output voltage (barometric pressure signal voltage) between terminal "3" and "Ground" terminal.

      If output voltage is out of specification, replace EVAP leak check module.

      If output voltage is within specified value, go to next step.

      CAUTION: If the battery is connected to the wrong terminals of the EVAP leak check module, the EVAP leak check pressure sensor in the EVAP leak check module may be damaged. Be sure to connect the battery to the correct terminals of the EVAP leak check module.

      EVAP leak check pressure sensor output voltage for initial (barometric) pressure (Terminal "4" voltage 4.5 - 5.5 V, ambient temp. 20 - 30°C (68 - 86°F)) 

      BAROMETRIC PRESSURE REFERENCE CHART
      
      

      Altitude (Reference)		Barometric Pressure		Output Voltage
      (ft)	(m)	(mmHg)	(kPa)	(V)
      0 - 2000	0 - 610	760 - 707	100 - 94	3.605 - 3.278
      2001 - 5000	611 - 1524	Under 707, over 634	94 - 85	3.278 - 2.788
      5001 - 8000	1525 - 2438	Under 634, over 567	85 - 76	2.788 - 2.297
      8001 - 10000	2439 - 3048	Under 567, over 526	76 - 70	2.297 - 1.970

      Fig 1: Checking EVAP Leak Check Pressure Sensor (Combine With Baro Sensor)

      Courtesy of SUZUKI OF AMERICA CORP.
2. Reference vacuum pressure (reference orifice vacuum) check:
   1. In the state of Step  1), operate EVAP leak detection pump by connecting 12 V-battery to terminal "1" and terminal "5" of EVAP leak check module. Under pump operating, check that pressure sensor output voltage (reference orifice vacuum) becomes lower than pressure sensor output voltage of Step  1) by approx. 0.1 V.

      If sensor voltage is out of specification, replace EVAP leak check module.

      Fig 2: Checking Vacuum Pressure

      Courtesy of SUZUKI OF AMERICA CORP.