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system. 3) Using scan tool, read Fuel Tank Differential Pressure (FTDP) sensor (item 73). Using hand-held pressure/vacuum pump, apply 0.42 psi. If scan tool reading reaches 0.42 psi, go to next step. If reading does not reach 0.42 psi, go to step 8). 4) Disconnect EVAP canister purge hose. Connect Purge Flow Indicator (MB995061) between EVAP canister and disconnected hose. Turn engine on and allow it to reach operating temperature. Turn all lights and accessories off. Place transmission in Park or Neutral. Observe purge flow indicator while increasing engine RPM several times. If purge flow indicator reads less than 2.5 SCFH (20 cm(3)/sec), check EVAP canister purge hose and EVAP canister port for clogging. If hose and port are okay, check EVAP purge solenoid. See DTC P0443. If solenoid is okay, replace EVAP canister. Go to step 20). 5) Using scan tool, read Engine Coolant Temperature (ECT) sensor temperature (item 21). Compare scan tool reading with temperature gauge reading. If readings are about the same, go to next step. If readings are not about the same, go to DTC P0115 test. 6) Using a thermometer, check engine compartment ambient temperature. Using scan tool, read Intake Air Temperature (IAT) sensor temperature (item 13). Compare IAT sensor and thermometer readings. If readings are not about the same, go to DTC P0110 test. If readings are about the same, go to next step. 7) Using scan tool, read Power Steering Pressure (PSP) switch status (item 27). Switch status should read ON when steering wheel is turned. If switch status is as specified, go to step 20). If switch status is not as specified, go to DTC P0551 test. 8) Remove fuel cap. Install a fuel tank filler tube adapter in place of fuel cap. Plug fuel filler tube adapter hose. Disconnect and plug air filter-to-EVAP vent solenoid hose at air filter. Disconnect intake manifold plenum-to-EVAP purge solenoid at intake manifold plenum. Install a "T" fitting between vacuum hose and intake manifold plenum. Connect hand-held pressure/vacuum pump to "T" fitting. Go to next step. CAUTION: DO NOT apply more than 0.57 psi in following step. Applying more than specified psi can crack fuel tank. NOTE: Ensure fuel tank is at least 1/4 full. The lower the fuel level in fuel tank, the longer it takes to pressurize fuel system. 9) Using scan tool, read Fuel Tank Differential Pressure (FTDP) sensor (item 73). Using hand-held pressure/vacuum pump, apply 0.42 psi. If scan tool reading reaches 0.42 psi, replace fuel cap. Go to step 20). If reading does not reach 0.42 psi, go to next step. 10) Disconnect hand-held pressure/vacuum pump from "T" fitting. Install an evaporative emission system tester in place of vacuum held pump and apply 0.49 psi. Wait two minutes. If pressure drops less than 0.20 psi, go to next step. If pressure drops 0.29 psi or more, go to step 13). 11) Disconnect EVAP purge solenoid-to-EVAP canister hose at EVAP canister. Connect hand-held pressure/vacuum pump to hose and apply 0.9 psi. If pressure is not maintained, check EVAP purge solenoid for leak. If EVAP purge solenoid is okay, replace hose. Go to step 24). If pressure is maintained, go to next step. 12) Disconnect EVAP vent solenoid-to-EVAP canister hose at EVAP canister. Connect hand-held pressure/vacuum pump to hose and apply 0.9 psi. If pressure is not maintained, check EVAP vent solenoid for leak. If EVAP vent solenoid is okay, replace hose. Go to step 20). If pressure is maintained, replace EVAP canister. Go to step 24). 13) Ensure hoses are properly routed and connected. See M - |