Ford Mustang (1999-2004) Service Manual: Inspection and Verification
1. Verify the customer concern is with the evaporative emission (EVAP) system.
2. Visually inspect for the following obvious signs of mechanical damage.
Visual Inspection Chart
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3. If the concern remains after the inspection, connect the scan tool to the data link connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the scan tool menu. If the scan tool does not communicate with the vehicle:
- check that the program card is correctly installed.
- check the connections to the vehicle.
- check the ignition switch position.
4. If the scan tool still does not communicate with the vehicle, refer to the scan tool manual.
5. Carry out the DATA LINK DIAGNOSTICS test. If the scan tool responds with:
- CKT914, CKT915 or CKT70 = ALL ECUS NO RESP/NOT EQUIP, refer to Section.
- NO RESP/NOT EQUIP for PCM, refer to the Powertrain Control/Emissions Diagnosis (PC/ED) manual.
- SYSTEM PASSED, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs and carry out the PCM KOEO self-test.
6. If the DTCs retrieved are related to the concern, go to the PCM Diagnostic Trouble Code (DTC) Index to continue diagnostics.
7. If the concern remains after the inspection, determine the symptom. GO to Symptom Chart .
PCM Diagnostics Trouble Code (DTC) Index
DTC | Description | Source | Action |
P0442 | Small leak detected in EVAP system (As small as 1.02 mm [0.040 inch]) | PCM | Go To Pinpoint Test A . |
P0455 | Major leak or no flow detected | PCM | Go To Pinpoint Test B . |
P0457 | Check for missing or leaking fuel filter cap | PCM | Go To Pinpoint Test A . |
P1443 | Very small or no purge flow detected | PCM | Go To Pinpoint Test B . |
P1450 | Excessive vacuum detected in the fuel tank | PCM | Go To Pinpoint Test C . |
- | Any other PCM DTC | PCM | REFER to the Powertrain Control/Emissions Diagnosis (PC/ED) manual. |
Symptom Chart
Condition | Possible Sources | Action |
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Principles of Operation
Evaporative Emission (EVAP) Canister Purge Valve
The EVAP canister purge valve is controlled by the powertrain control
module (PCM). The EVAP
canister purge valve controls the flow of fuel vapors ...
Pinpoint Tests
NOTE: Reinstall or install new evaporative emission hose clamps
removed or damaged during testing
procedures.
PINPOINT TEST A: DTC P0442 SMALL LEAK IN EVAP SYSTEM
Test Step
Result / Action to ...
Other materials:
Component Test
Windshield Wiper Motor
CAUTION: Do not handle the wiper motor abusively when
diagnosing the wiper
operations. Failure to follow this caution may result in damage to the
motor magnets and will
make the wiper motor inoperative. Rough handling of new ...
Vehicle certification label
The National Highway Traffic Safety
Administration Regulations require
that a Safety Compliance Certification
Label be affixed to a vehicle and
prescribe where the Safety Compliance
Certification Label may be located.
The Safety Compliance Certification
Labe ...
Transmission Connector Layouts
Transmission Vehicle Harness Connector
Transmission Internal Harness Connector
Digital Transmission Range (TR) Sensor Connector
Output Shaft Speed (OSS) Sensor Harness Connector
Digital Transmission Range (TR) Senso ...