2003 FORD MUSTANG Cranking the engine

z
After determining the "system", use the diagnostic tools to identify the worn or damaged
"components".
z After identifying the "components", try to find the "cause" of the failure.
Once the concern is narrowed down to a symptom/condition, proceed to NVH Condition and Symptom
Categories.
NVH Condition and Symptom Categories
A good diagnostic process is a logical sequence of steps that lead to the identification of a causal
system. Use the condition and symptom categories as follows:
zIdentify the operating condition that the vehicle is exhibiting.
z Match the operating condition to the symptom.
z Verify the symptom.
z Identify which category or system could cause the symptom.
z Refer to the diagnostic symptom chart that is referred to.
Operating Condition— Vehicle is Not Moving
1. Static operation zNoise occurs during component/system functioning. GO to Symptom Chart — Squeak
and Rattle .
2. While cranking 1. Grinding or whine, differential ring gear or starter motor pinion noise. GO to Symptom Chart — Engine Noise/Vibration .
2. Rattle. Exhaust hanger, exhaust heat shield or A/C line noise. GO to Symptom Chart —
Squeak and Rattle .
3. Vibration. Acceptable condition.
3. At idle zIdle noise. GO to Symptom Chart — Idle Noise/Vibration .
z Idle vibration or shake. GO to Symptom Chart — Idle Noise/Vibration .
4. During Gear Selection 1. Vehicle parked on a steep incline. Acceptable noise.
2. Vehicle parked on a flat surface. GO to Symptom Chart — Driveline Noise/Vibration .
3. Vehicle with a manual transmission. GO to Symptom Chart — Transmission (Manual)
and Transfer Case Noise/Vibration .
Operating Condition— Vehicle is Moving
1. Depends more on how the vehicle is operated 1. Speed related
„Related to vehicle speed
„Pitch increases with vehicle speed. GO to Symptom Chart — Tire
Noise/Vibration .
„ Noise occurs at specific vehicle speed. A high- pitched noise (whine). GO to
Symptom Chart — Driveline Noise/Vibration . Klj . 10 ba
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CARRY OUT a driveline
vibration test. REFER to
Section 205
- 00 . REPAIR as
necessary.
z Binding or
damaged
splines on the
driveshaft slip-
yoke. z
CLEAN and INSPECT the
splines of the slip- yoke,
driveshaft and coupling
shaft for wear or damage.
INSTALL a new slip- yoke or
driveshaft assembly as
necessary. REFER to
Section 205 - 01 . REPAIR as
necessary.
z Driveshaft
runout. z
CARRY OUT a Runout
Check. REFER to Section 205 - 00 . REPAIR as
necessary.
z Incorrect lateral
and radial
tire/wheel
runout. z
INSPECT the tire and
wheels. MEASURE tire
runouts. REPAIR or
INSTALL new components
as necessary. REFER to
Section 204 - 04 .
z Driveline angles
out of
specification. z
CHECK for correct driveline
angles. REPAIR as
necessary. REFER to
Section 205 - 00 .
z Incorrectly
seated CV joint
in the front
wheel hub. z
CHECK the outer CV joint
for correct seating into the
hub. REPAIR as necessary. Symptom Chart —
Engine Noise/Vibration Condition
Possible Sources Action
z Grinding noise—
occurs during
engine cranking z
Incorrect starter
motor mounting. z
INSPECT the starter motor
for correct mounting.
REPAIR as necessary.
REFER to Section 303 - 06 .
z Starter motor. zCHECK the starter motor.
REPAIR or INSTALL a new
starter motor as necessary.
REFER to Section 303 - 06 .
z Incorrect starter
motor drive
engagement. z
INSPECT the starter motor
drive and flexplate/flywheel
for wear or damage.
INSTALL a new starter
motor drive or flywheel as
necessary. REFER to
Section 303 - 06 .
z Engine ticking
noise z
Fuel injector.
z Fuel line.
z Oil pump.
z Valve lifter.
z Belt tensioner.
z Water pump.
z Obstruction of cooling
fan. z
Go To Pinpoint Test B .
z Engine drumming zPowertrain mount. zCARRY OUT Klj . 23 ba
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GENERAL PROCEDURES
System Flushing —
CII Power Steering Pump
WARNING: Do not mix oil types. Any mixture or any unapproved oil can lead to seal
deterioration and leaks. A leak can ultimately cause loss of fluid, which can result in a loss of
power steering assist.
1. Remove the fuel pump fuse from the battery junction box.
2. Disconnect the power steering return hose. Plug the reservoir.
3. Attach an extension hose between the power steering return hose and an empty container.
4. Raise the front wheels off the floor. For additional information, refer to Section 100 - 02 .
5. Check the fluid level. If necessary, fill the reservoir to the correct level. zUse Motorcraft MERCON® Multi-Purpose ATF XT -2-QDX or MERCON® equivalent.
6. CAUTION: Do not crank the engine for more than 15 seconds at a time. Allow the
starter to cool for 1 minute before cranking again. Premature starter failure can occur.
CAUTION: Do not hold the steering wheel against the stops for more than three to
five seconds at a time. Damage to the power steering pump will occur.
Turn the steering wheel from stop- to-stop while cranking the engine until the fluid exiting the
power steering return hose is clear of all contamination and foreign material.
zAdd Motorcraft MERCON® Multi-Purpose ATF XT -2-QDX or MERCON® equivalent as
needed.
7. Lower the vehicle.
8. Disconnect the extension hose from the power steering return hose. Remove the plug. Attach the power steering return hose to the reservoir.
SECTION 211-
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GENERAL PROCEDURES
System Flushing —
CIII Power Steering Pump
WARNING: Do not mix oil types. Any mixture or any unapproved oil can lead to seal
deterioration and leaks. A leak can ultimately cause loss of fluid, which can result in a loss of
power steering assist.
1. Remove the fuel pump fuse from the battery junction box.
2. Disconnect the power steering return hose. Plug the reservoir.
3. Attach an extension hose between the power steering return hose and an empty container.
4. Raise the front wheels off the floor. For additional information, refer to Section 100 - 02 .
5. Check the fluid level. If necessary, fill the reservoir to the correct level. zUse Motorcraft MERCON® Multi-Purpose ATF XT -2-QDX or MERCON® equivalent.
6. CAUTION: Do not crank the engine for more than 15 seconds at a time. Allow the
starter to cool for 1 minute before cranking again. Premature starter failure can occur.
CAUTION: Do not hold the steering wheel against the stops for more than three to
five seconds at a time. Damage to the power steering pump could occur.
Turn the steering wheel from stop- to-stop while cranking the engine until the fluid exiting the
power steering return hose is clear of all contamination and foreign material.
zAdd Motorcraft MERCON® Multi-Purpose ATF XT -2-QDX or MERCON® equivalent as
needed.
7. Lower the vehicle.
8. Disconnect the extension hose from the power steering return hose. Remove the plug. Attach the power steering return hose to the reservoir.
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GENERAL PROCEDURES
Fill
1. WARNING: Do not mix oil types, any mixture or any unapproved oil can lead to seal
deterioration and leaks. A leak can ultimately cause loss of fluid, which can result in a
loss of power steering assist.
Check the fluid level. If necessary, fill the reservoir to the correct level.
zUse Motorcraft MERCON® Multi-Purpose ATF XT -2-QDX or MERCON® equivalent.
2. Remove the fuel pump fuse from the battery junction box.
3. Raise the front wheels off the floor. For additional information, refer to Section 100 - 02 .
4. CAUTION: Do not crank the engine for more than 15 seconds at a time. Allow the
starter to cool for 1 minute before cranking again. Premature starter failure can occur.
CAUTION: Do not hold the steering wheel against the stops for more than three to
five seconds at a time. Damage to the power steering pump will occur.
Turn the steering wheel from stop- to-stop while cranking the engine.
5. Lower the vehicle.
6. CAUTION: Do not overfill the reservoir.
Check the fluid level. If necessary, fill the reservoir to the correct level. zUse Motorcraft MERCON® Multi-Purpose ATF XT -2-QDX or MERCON® equivalent.
7. Install the fuel pump fuse.
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required to obtain the highest reading.
5. Repeat the test on each cylinder, cranking the engine approximately the same number of compression strokes.
Compression Test— Test Results
The indicated compression pressures are considered within specification if the lowest reading cylinder
is at least 75 percent of the highest reading. Refer to the Compression Pressure Limit Chart.
If one or more cylinders reads low, squirt approximately one tablespoon of engine oil on top of the
pistons in the low- reading cylinders. Repeat the compression pressure check on these cylinders. Compression Test — Interpreting Compression Readings Compression Pressure Limit Chart
Maximum
Pressure Minimum
Pressure Maximum
Pressure Minimum
Pressure Maximum
Pressure Minimum
Pressure Maximum
Pressure Minimum
Pressure 924 kPa
(134 psi) 696 kPa
(101 psi) 1131 kPa
(164 psi) 848 kPa
(123 psi) 1338 kPa
(194 psi) 1000 kPa
(146 psi) 1544 kPa
(224 psi) 1158 kPa
(168 psi) 938 kPa
(136 psi) 703 kPa
(102 psi) 1145 kPa
(166 psi) 855 kPa
(124 psi) 1351 kPa
(196 psi) 1014 kPa
(147 psi) 1558 kPa
(226 psi) 1165 kPa
(169 psi) 952 kPa
(138 psi) 717 kPa
(104 psi) 1158 kPa
(168 psi) 869 kPa
(126 psi) 1365 kPa
(198 psi) 1020 kPa
(148 psi) 1572 kPa
(228 psi) 1179 kPa
(171 psi) 965 kPa
(140 psi) 724 kPa
(106 psi) 1172 kPa
(170 psi) 876 kPa
(127 psi) 1379 kPa
(200 psi) 1034 kPa
(150 psi) 1586 kPa
(230 psi) 1186 kPa
(172 psi) 979 kPa
(142 psi) 738 kPa
(107 psi) 1186 kPa
(172 psi) 889 kPa
(129 psi) 1303 kPa
(202 psi) 1041 kPa
(151 psi) 1600 kPa
(232 psi) 1200 kPa
(174 psi) 933 kPa
(144 psi) 745 kPa
(109 psi) 1200 kPa
(174 psi) 903 kPa
(131 psi) 1407 kPa
(204 psi) 1055 kPa
(153 psi) 1055 kPa
(153 psi) 1207 kPa
(175 psi) 1007 kPa
(146 psi) 758 kPa
(110 psi) 1214 kPa
(176 psi) 910 kPa
(132 psi) 1420 kPa
(206 psi) 1062 kPa
(154 psi) 1627 kPa
(154 psi) 1220 kPa
(177 psi) 1020 kPa
(148 psi) 765 kPa
(111 psi) 1227 kPa
(178 psi) 917 kPa
(133 psi) 1434 kPa
(208 psi) 1075 kPa
(156 psi) 1641 kPa
(238 psi) 1227 kPa
(178 psi) 1034 kPa
(150 psi) 779 kPa
(113 psi) 1241 kPa
(180 psi) 931 kPa
(135 psi) 1448 kPa
(210 psi) 1083 kPa
(157 psi) 1655 kPa
(240 psi) 1241 kPa
(180 psi) 1048 kPa
(152 psi) 786 kPa
(114 psi) 1255 kPa
(182 psi) 936 kPa
(136 psi) 1462 kPa
(212 psi) 1089 kPa
(158 psi) 1669 kPa
(242 psi) 1248 kPa
(181 psi) 1062 kPa
(154 psi) 793 kPa
(115 psi) 1269 kPa
(184 psi) 952 kPa
(138 psi) 1476 kPa
(214 psi) 1103 kPa
(160 psi) 1682 kPa
(244 psi) 1262 kPa
(183 psi) 1076 kPa
(156 psi) 807 kPa
(117 psi) 1282 kPa
(186 psi) 965 kPa
(140 psi) 1489 kPa
(216 psi) 1117 kPa
(162 psi) 1696 kPa
(246 psi) 1269 kPa
(184 psi) 1089 kPa
(158 psi) 814 kPa
(118 psi) 1296 kPa
(188 psi) 972 kPa
(141 psi) 1503 kPa
(218 psi) 1124 kPa
(163 psi) 1710 kPa
(248 psi) 1202 kPa
(186 psi) 1103 kPa
(160 psi) 827 kPa
(120 psi) 1310 kPa
(190 psi) 979 kPa
(142 psi) 1517 kPa
(220 psi) 1138 kPa
(165 psi) 1724 kPa
(250 psi) 1289 kPa
(187 psi) 1110 kPa
(161 psi) 834 kPa
(121 psi) 1324 kPa
(192 psi) 993 kPa
(144 psi) 1631 kPa
(222 psi) 1145 kPa
(166 psi) — —Klj . 8 ba
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reading is still greater than 0.5 volts when checked at the M-
terminal and less than 0.5 volts
when checked at the B- terminal, the concern is in the solenoid contacts. Install a new starter
motor. Refer to Starter Motor — 3.8L or
Starter Motor — 4.6L .
9. Clean the positive (+) battery cable connections. Repeat the test at the starter solenoid B terminal. If the voltage is greater than 0.5 volts, install a new positive battery cable.
Starter Motor— Ground Circuit
A slow cranking condition can be caused by resistance in the ground or return portion of the cranking
circuit. Check the voltage drop in the ground circuit as follows:
1. Connect the Digital Multimeter positive lead to the starter motor housing (the connection must be clean and free of rust or grease). Connect the negative lead to the negative (- ) battery
terminal.
2. Engage the remote starter switch. Read and record the voltage. The voltage reading should be less than 0.3 volts.
3. If the voltage is greater than 0.3 volts, clean the negative cable connections at the battery, body ground connections, and the starter ground connections. Retest.
4. If the voltage is greater than 0.3 volts, install a new cable. If the voltage reading is less than 0.2 volts and the engine still cranks slowly, install a new starter motor. Refer to Starter Motor — 3.8L
or
Starter Motor — 4.6L . Item Part Number Description
1 105-
R0057 Digital multimeter
2 10653 Battery
3 — S-
terminal 4 — M-
terminal 5 — B-
terminal 6 — Remote starter switch Klj . 10 ba
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If two substances of different temperature are placed near each other, the heat in the warmer
substance will transfer to the colder substance.
Latent Heat of Vaporization
When a liquid boils (converts to a gas), it absorbs heat without raising the temperature of the resulting
gas. When the gas condenses (reverts back to a liquid), it gives off heat without lowering the
temperature of the resulting liquid.
Relative Humidity
The amount of moisture (water vapor content) that the air can hold is directly related to the air
temperature. The more heat there is in the air, the more moisture the air can hold. The lower the
moisture content in the air, the more comfortable you feel. Removing moisture from the air lowers its
relative humidity and improves personal comfort.
Effects of Pressure on Boiling or Condensation
As the pressure is increased on a liquid, the temperature at which the liquid boils (converts to a gas)
also increases. Conversely, when the pressure on a liquid is reduced, its boiling point is also reduced.
When in the gas state, an increase in pressure causes an increase in temperature, while a decrease in
pressure will decrease the temperature of the gas.
Compressor Anti-
Slugging Strategy
Liquid refrigerant may accumulate in the A/C compressor under certain conditions. To alleviate
damage to the A/C compressor, compressor anti- slugging strategy (CASS) is utilized.
CASS is initiated only under specific conditions:
zthe ignition is off for more than 8 hours
z the ambient temperature is above -4º C (25ºF)
z battery voltage is above 8.5 volts during engine cranking
When these conditions are present, the powertrain control module (PCM) will activate the A/C control
relay prior to cranking of the engine. The A/C control relay engages the A/C compressor for
approximately 4- 15 A/C compressor revolutions or a maximum of 2 seconds (depending upon vehicle
application), allowing the liquid refrigerant to be pushed from the A/C compressor. CASS is initiated by
the PCM regardless of the function selector switch position or the EATC system settings.
The Refrigerant Cycle
During stabilized conditions (air conditioning system shut down), the refrigerant is in a vaporized state
and pressures are equal throughout the system. When the A/C compressor (19703) is in operation, it
increases pressure on the refrigerant vapor, raising its temperature. The high- pressure and high-
temperature vapor is then released into the top of the A/C condenser core (19712).
The A/C condenser core, being close to ambient temperature, causes the refrigerant vapor to
condense into a liquid when heat is removed from the refrigerant by ambient air passing over the fins
and tubing. The now liquid refrigerant, still at high pressure, exits from the bottom of the A/C
condenser core and enters the inlet side of the A/C evaporator core orifice (19D990).
The A/C evaporator core orifice is the restriction in the refrigerant system that creates the high
pressure buildup upstream of the A/C evaporator core (19860) and separates the high and low
pressure sides of the A/C system. As the liquid refrigerant leaves this restriction, its pressure and
boiling point are reduced.
The liquid refrigerant is now at its lowest pressure and temperature. As it passes through the A/C Klj . 3 ba
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