Canister System Leak Test
- Turn ignition off. Connect 2 "T" fittings and vacuum pump to hoses between EVAP control canister and EVAP 2-way valve as illustrated. See Fig 1
. Connect fuel tank pressure sensor to one "T" fitting and vacuum pump to second "T" fitting. See Fig 1
. Remove vent hose from EVAP control canister shut valve and cap open port. See Fig 2
. Turn ignition on and go to next step.
- Using backprobe set, measure voltage between PCM 16-pin connector "D" terminals No. 15 (White/Blue wire) and No. 11 (Green/Black wire), or using an scan tool monitor FTP sensor voltage. See Figure
. Using vacuum pump, slowly apply vacuum every 1-2 seconds until voltage reading drops to about 1.5 volts. Ensure engine coolant temperature is above 95°F (35°C). Monitor voltage for 20 seconds. If voltage does not drop to 1.5 volts and hold for 20 seconds, go to next step. If voltage drops to 1.5 volts and holds for at least 20 seconds, check EVAP control canister Vent Shut Valve (VSV) line and connections.
- Turn ignition off. Disconnect hose form EVAP control canister. See Fig 3
. Cap open port. Turn ignition on. Using backprobe set, measure voltage between PCM 16-pin connector "D" terminals No. 15 (White/Blue wire) and No. 11 (Green/Black wire), or using an scan tool monitor FTP sensor voltage. Using vacuum pump, slowly apply vacuum every 1-2 seconds until voltage reading drops to about 1.5 volts. Ensure engine coolant temperature is above 95°F (35°C). Monitor voltage for 20 seconds. If voltage does not drop to 1.5 volts and hold for 20 seconds, go to next step. If voltage drops to 1.5 volts and holds for at least 20 seconds, check On-board Refueling Vapor Recovery (ORVR) vent line and connections.
- Turn ignition off. Disconnect purge hose from canister and plug hose. See Fig 4
. Turn ignition on. Using backprobe set, measure voltage between PCM 16-pin connector "D" terminals No. 15 (White/Blue wire) and No. 11 (Green/Black wire), or using an scan tool monitor FTP sensor voltage. Using vacuum pump, slowly apply vacuum every 1-2 seconds until voltage reading drops to about 1.5 volts. Ensure engine coolant temperature is above 95°F (35°C). Monitor voltage for 20 seconds. If voltage does not drop to 1.5 volts and hold for 20 seconds, replace EVAP control canister. If voltage drops to 1.5 volts and holds for at least 20 seconds, check EVAP purge control solenoid valve line and connections. If line and connections are okay, perform 2-way valve test and ORVR Vent Shut Valve (VSV) test. See SYSTEM & COMPONENT TESTS.
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Courtesy of AMERICAN HONDA MOTOR CO., INC.