Ford 2003 Mustang Workshop Manual page 2163

PINPOINT TEST E: EXCESSIVE FUEL ODOR
E1 EVAPORATIVE EMISSION SYSTEM LEAK TEST
Carry out the Evaporative Emission System Leak
Test procedure. Refer to
System Leak Test
Does the EVAP system pass the leak test?
E2 CARRY OUT THE EVAPORATIVE EMISSION
SYSTEM RUNNING LOSS MONITOR REPAIR
VERIFICATION DRIVE CYCLE
Carry out the Evaporative Emission Running Loss
Monitor Repair Verification Drive Cycle; refer to the
Powertrain Control/Emissions Diagnosis (PC/ED)
manual.
Are the powertrain control module DTCs
retrieved?
E3 ISOLATE SYSTEM LEAK FROM FRONT TO REAR
Disconnect EVAP canister purge outlet tube from
fuel vapor control valve tube assembly and plug
both ends.
Connect the Evaporative Emission System Leak
Tester to the evaporative emissions test port.
Pressurize the EVAP system to 3.48 kPa (14
inches H O).
2
Does the pressure drop immediately?
E4 TEST FUEL VAPOR HOSE FROM FUEL TANK TO
TUBE ASSEMBLY FUEL SUPPLY-RETURN AND
VAPOR
Disconnect the fuel vapor return hose from the
tube assembly fuel supply-return and vapor under
vehicle, and plug the fuel supply-return and vapor
tube assembly.
Pressurize the EVAP system to 3.48 kPa (14
inches H O).
2
Does the pressure drop immediately?
E5 TEST THE FUEL SUPPLY-RETURN AND VAPOR
TUBE ASSEMBLY
Test Step
Evaporative Emission
in this section.
Emission Repair Verification Drive
Cycle in this section.
Result / Action to Take
Yes
GO to E2 .
No
GO to E3 .
Yes
For DTCs P0442, P0455, P1443,
and P1450 REFER to the Diagnostic
Trouble Code (DTC) Index in this
section. For all other DTCs, REFER
to the Powertrain Control/Emissions
Diagnosis (PC/ED) manual for
diagnosis of the DTCs.
No
EVAP system diagnosis complete.
REFER to Symptom Chart.
Yes
GO to E4 .
No
GO to E9 .
Yes
GO to E5 .
No
INSTALL a new fuel vapor return
hose. CARRY OUT a leak test.
REFER to Evaporative Emission
System Leak Test on this section. If
the system passes the leak test,
CARRY OUT the evaporative
emission repair verification drive
cycle. REFER to Evaporative
Emission Repair Verification Drive
Cycle in this section.