2003 FORD MUSTANG sensor

Test Step Result / Action to Take
D1 TEST FOR FUEL TANK PRESSURE SENSOR
OPERATION z
Key in OFF position.
z Connect the Evaporative Emission System Leak
Tester to the fuel filler pipe.
z Close the canister vent solenoid. Refer to Canister Vent Solenoid Closing Procedure in this section.
z Pressurize the EVAP system to 3.48 kPa (14
inches H
2 O).
z Is the FTP (FTP V) PID reading 3.11 kPa to 3.86
kPa (12.5 to 15.5 inches H
2 O) (4.22 to 4.90
volts)? Yes
GO to
D2 .
No
GO to D3 .
D2 TEST FOR BLOCKAGE IN VENTING PORTION
OF EVAP SYSTEM z
Open the canister vent solenoid by selecting the
STOP button on the scan tool.
z Does the pressure drop immediately? Yes
CARRY OUT the evaporative
emission repair verification drive
cycle. REFER to
Evaporative Emission Repair Verification Drive
Cycle in this section.
No
GO to D7 .
D3 TEST FOR FUEL TANK PRESSURE SENSOR
OPERATION z
Connect the Evaporative Emission System Leak
Tester to the evaporative emission test port.
z Close the canister vent solenoid. Refer to Canister Vent Solenoid Closing Procedure in this section.
z Pressurize the EVAP system to 3.48 kPa (14
inches H
2 O).
z Is the FTP (FTP V) PID reading 3.11 kPa to 3.86
kPa (12.5 to 15.5 inches H
2 O) (4.22 to 4.90
volts)? Yes
GO to
D4 .
No
REFER to the Powertrain
Control/Emissions Diagnosis (PC/ED)
manual. D4 TEST TO DETERMINE BLOCKAGE LOCATION
z
Open the canister vent solenoid.
z Does the pressure drop immediately? Yes
GO to
D5 .
No
GO to D7 .
D5 TEST FOR PINCHED FUEL VAPOR CONTROL
VALVE TUBE z
Lower the fuel tank 19.05 mm (3/4 inch).
z Connect the Evaporative Emission System Leak
Tester to the fuel filler pipe.
z Close the canister vent solenoid. Refer to Canister Vent Solenoid Closing Procedure in this section.
z Pressurize the EVAP system to 3.48 kPa (14
inches H
2 O).
z Is the FTP (FTP V) PID reading 3.11 kPa to 3.86
kPa (12.5 to 15.5 inches H
2 O) (4.22 to 4.90
volts)? Yes
INSTALL a new fuel vapor control
valve tube assembly. REFER to
Fuel Vapor Control Tube Assembly Valve
in this section. CARRY OUT a leak
test. REFER to
Evaporative Emission System Leak Test in 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. Klj . 12 ba
252003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...

are mandatory when proceeding through the following drive cycle.
7. NOTE: This step allows engine warm- up and provides intake air temperature (IAT) input to the
PCM.
Idle the vehicle for 15 seconds. Drive at 64 km/h (40 mph) until the ECT is at least 76.7°C (170°
F).
8. Is IAT above 4.4°C (40°F) and below 37.8°C (100°F)? If not, continue with the following steps but note that the EVAP Monitor Bypass portion of the drive cycle (Step 13) will be required to
bypass the EVAP monitor and clear the P1000.
9. NOTE: This step executes the heated oxygen sensor (HO2S) monitor.
Cruise at 64 km/h (40 mph) for 60 seconds.
10. NOTE: This executes the EVAP monitor if IAT is above 4.4°C (40°F) and below 37.8°C (100°F).
NOTE: To initiate the monitor, TP MODE should equal PT, EVAPDC must be greater than 75%,
and FLI must be between 15 and 85%.
NOTE: Avoid sharp turns and hills.
Cruise at 72 to 104 km/h (45 to 65 mph) for 10 minutes.
11. NOTE: This step executes the ISC portion of the Secondary Air/CCM.
Bring the vehicle to a stop. Idle with the transmission in DRIVE (for automatic transmission) or
NEUTRAL (for manual transmission) for two minutes.
Pending Code and EVAP Monitor Bypass Check
12. NOTE: This determines if a pending code is preventing the clearing of P1000.
NOTE: If the EVAP monitor is not complete and IAT was below 4.4°C (40°F) or above 37.8°C
(100°F) temperature range in Step 8, or the altitude is above 2,438 meters (8,000 feet), the
EVAP Monitor Bypass (Step 13) must be carried out.
Using the scan tool, check for pending codes. Conduct normal repair procedures for any
pending code concerns. Rerun any incomplete monitor.
EVAP Monitor Bypass
13. NOTE: This allows the bypass counter to increment to two.
NOTE: Do not repeat Step 4.
Park the vehicle for a minimum of eight hours. Repeat Steps 5 through 12. Klj . 2 ba
32003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...

REMOVAL AND INSTALLATION
Fuel Vapor Vent Valve
Removal and Installation
1. NOTE: The fuel vapor vent valve is repaired along with the fuel vapor control valve and the in-
line fuel tank pressure sensor as a fuel vapor control valve tube assembly.
For removal and installation of the fuel vapor vent valve, refer to Fuel Vapor Control Tube Assembly Valve in this section.
SECTION 303-
13: Evaporative Emissions 2003 Mustang Workshop Manual Klj . 1 ba
12003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...

REMOVAL AND INSTALLATION
Fuel Vapor Control Tube Assembly Valve
Removal and Installation
1. Remove the fuel tank. For additional information, refer to Section 310 - 01 .
2. Remove the retainers.
3. NOTE: The fuel vapor vent valve, fuel vapor control valve and the in- line fuel tank pressure
sensor are repaired as a fuel vapor control valve tube assembly.
NOTE: It may be necessary to lubricate the fuel vapor control valve tube assembly grommets
with ESE- M00B144- B Merpol® or equivalent to assist in the removal procedure.
Remove the fuel vapor control valve tube assembly. 1. Loosen the fuel vapor vent valve.
2. Loosen the fuel vapor control valve.
3. Remove the fuel vapor control valve tube assembly.
4. NOTE: Lubricate all O- ring seals with MERPOL® O-Ring Seal Lubricant or equivalent meeting
Ford specification ESE-M99B144- B.
NOTE: New grommets are necessary when the fuel vapor control valve tube assembly is
removed.
To install, reverse the removal procedure.
zLeak test the system. For additional information, refer to Evaporative Emission System Leak Test in this section.
z Carry out the evaporative emission repair verification drive cycle. For additional
SECTION 303-
13: Evaporative Emissions 2003 Mustang Workshop Manual Klj . 1 ba
22003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...

REMOVAL AND INSTALLATION
Fuel Tank Pressure Sensor
Removal and Installation
1. NOTE: The in-line fuel tank pressure sensor is repaired along with the fuel vapor vent valve and
the fuel vapor control valve as a fuel vapor control valve tube assembly.
For removal and installation of the fuel vapor control valve, refer to Fuel Vapor Control Tube Assembly Valve in this section.
SECTION 303-
13: Evaporative Emissions 2003 Mustang Workshop Manual Klj . 1 ba
12003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...

SPECIFICATIONS
SECTION 303-
14: Electronic Engine Controls 2003 Mustang Workshop Manual General Specifications
Item Specification
Lubricants
Super premium SAE 5W-
20 Engine Oil XO-5W20-DSP WSS-
M2C914- A Penetrating and Lock Lubricant E8AZ-19A501-
B N/A
Pipe Sealant with Teflon D8AZ-19554-
A WSK-
M26350- A2
Torque Specifications Description Nm lb-
ft lb-
in Cylinder head temperature (CHT) sensor —
3.8L 10 — 89
Engine coolant temperature (ECT) sensor —
4.6L (2V) 20 — 15
Engine coolant temperature (ECT) sensor —
4.6L (4V) 24 18 —
Heated oxygen sensors (HO2S) 41 30 —
Catalyst monitor sensors 41 30 —
Crankshaft position (CKP) sensor bolts —
3.8L 6 — 53
Crankshaft position (CKP) sensor bolts —
4.6L 10 — 89
Power steering reservoir bolts 10 — 89
Camshaft position (CMP) sensor bolt —
4.6L 10 — 89
PCM connector to module bolt 6 — 53
Idle air control (IAC) valve bolts 10 — 89
Camshaft synchronizer housing bolt 25 18 —
Throttle position (TP) sensor screws 3 — 27
Fuel pressure sensor bolts 4 — 35
Air intake scoop bolts 25 18 —
Air intake scoop bracket bolt 25 18 —
Air intake scoop bracket nuts 25 18 —
Air intake scoop bracket throttle body nut 9 — 80
Exhaust gas recirculation (EGR) vacuum regulator solenoid bolts 10 — 89 Klj . 1 ba
22003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...

DESCRIPTION AND OPERATION
Electronic Engine Controls
The electronic engine controls consist of the following:
zpowertrain control module (PCM)
z throttle position (TP) sensor
z idle air control (IAC) valve
z engine coolant temperature (ECT) sensor
z cylinder head temperature sensor
z camshaft position (CMP) sensor
z crankshaft position (CKP) sensor
z mass air flow (MAF) sensor
z intake air temperature (IAT) sensor
z heated oxygen sensor (HO2S) — front
z catalyst monitor sensor — rear
z wheel speed sensor
The powertrain control module needs the following inputs to calibrate the engine correctly:
zcrankshaft position
z engine rpm
z engine load (manifold pressure)
z atmospheric (barometric) pressure
z engine coolant temperature
The throttle position sensor:
zsends the powertrain control module a signal indicating the throttle plate angle.
z is the main input to the powertrain control module from the driver.
The idle air control valve:
zcontrols bypass air around the throttle plate at low speeds.
z is controlled by the powertrain control module.
The cylinder head temperature sensor:
zprovides a gauge signal for coolant temperature.
z is mounted on rear of LH cylinder head.
z sends the powertrain control module a signal indicating engine temperature.
z resistance decreases as coolant temperature increases.
SECTION 303-
14: Electronic Engine Controls 2003 Mustang Workshop Manual Klj . 1 ba
32003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...

The camshaft position sensor:
zsends the powertrain control module a signal indicating camshaft position, used for fuel
synchronization.
The crankshaft position sensor:
zsends the powertrain control module a signal indicating crankshaft position.
z is essential for calculating spark timing.
The mass air flow sensor:
zsends the powertrain control module a signal indicating mass air flow rate of air entering the
engine.
The intake air temperature sensor:
zsends the powertrain control module a signal indicating the temperature of the air entering the
engine.
The heated oxygen sensor:
zhas the ability to create a voltage signal depending on exhaust oxygen content.
z provides feedback information to the powertrain control module used to calculate fuel delivery.
The rear catalyst monitor sensor:
zmonitors oxygen content after the oxygen flows through the catalytic converter.
z provides a voltage to the powertrain control module used to calculate catalytic converter
integrity.
The wheel speed sensor:
zsends a signal to the powertrain control module indicating wheel speed. Klj . 2 ba
32003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...