Ford F-150 2002 - Page 3

manual.
NOTE: If a concern still exists after electrical diagnosis have been carried out , refer to Diagnosis By Symptom in this section.
If DTCs appear while carrying out the on-board diagnostics, refer to the Diagnostic Trouble Code Chart for the appropriate procedure. Prior to entering pinpoint tests,
refer to any TSBs and OASIS messages for transmission concerns.
Diagnostic Trouble Code Charts
Diagnostic Trouble Code Chart
Diagnostic
Trouble
Code Component Description Condition Symptom Action
P1111 System Pass No concern detected. Concern not detected by PCM. Refer to the Powertrain
Control/Emissions Diagnosis
(PC/ED) manual.
P0340,
P0341,
P0344
DI DI system concern. Engine rpm circuit failure. CKP sensor failure/engine will stall or not
run. May flash TCIL.
a
Refer to the Powertrain
Control/Emissions Diagnosis
(PC/ED) manual.
P0237 Manifold
Absolute
Pressure (MAP)
Sensor
MAP sensor out of
On-
Board Diagnostics
range.
MAP sensor signal higher or lower
than expected or no response
during Dynamic Response
(Goose) Test.
— Rerun On-Board Diagnostics.
P0236 Manifold
Absolute
Pressure (MAP)
Sensor
MAP sensor vacuum
circuit failure.
MAP sensor signal higher or lower
than expected or no response due
to vacuum hose, circuit damaged,
disconnected or restricted.
Firm shift feel, late shifts at altitude. Refer to the Powertrain
Control/Emissions Diagnosis
(PC/ED) manual.
P0235 Manifold
Absolute
Pressure (MAP)
Sensor
MAP sensor inactive. MAP sensor or circuit open,
shorted to ground or 5V.
Firm shift feel, late shift at altitude. Refer to the Powertrain
Control/Emissions Diagnosis
(PC/ED) manual.
P1124 Throttle Position
(TP) Sensor
TP sensor out of On-
Board Diagnostics
range.
TP sensor (gasoline engines) not
at idle position during KOEO.
— Rerun at appropriate TP
sensor position per the
engine application.
P0500,
P1502
VSS/ABS Insufficient or
intermittent vehicle
speed input.
PCM detected a loss of vehicle
speed signal during operation.
Harsh engagements, firm shift feel,
abnormal shift schedule, unexpected
downshifts may occur at closed throttle,
abnormal TCC operation or engages only
at WOT. May flash MIL.
Refer to the Powertrain
Control/Emissions Diagnosis
(PC/ED) manual.
P0503 VSS/ABS Vehicle speed sensor
intermittent.
PCM detected a loss, or an
unrealistic change of vehicle
speed signal during operation.
Possible fluctuation in the speedometer.
May flash TCIL.
Refer to the Powertrain
Control/Emissions Diagnosis
(PC/ED) manual.
P0731
b
SSA, SSB or
Internal
Transmission
Components
Incorrect gear 1 ratio.
1-2 shift error.
Incorrect gear ratio(s) detected
when 1-
2 shift was commanded by
PCM.
Incorrect gear selection depending on
failure mode and transmission range
selector lever position. Refer to the
Solenoid Operation Chart. Shift errors
may also be due to other internal
transmission concerns such as stuck
valves or damaged friction material. May
flash TCIL.
GO to Pinpoint Test A.
P0732
b
SSA, SSB or
Internal
Transmission
Components
Incorrect gear 1 ratio.
1-2 shift error.
Incorrect gear ratio(s) detected
when 1-
2 shift was commanded by
PCM.
Incorrect gear selection depending on
failure mode and transmission range
selector lever position. Refer to the
Solenoid Operation Chart. Shift errors
may also be due to other internal
transmission concerns such as stuck
valves or damaged friction material. May
flash TCIL.
GO to Pinpoint Test A.
P0733
b
SSA, SSB or
Internal
Transmission
Components
Incorrect gear 1 ratio.
1-2 shift error.
Incorrect gear ratio(s) detected
when 1-
2 shift was commanded by
PCM.
Incorrect gear selection depending on
failure mode and transmission range
selector lever position. Refer to the
Solenoid Operation Chart. Shift errors
may also be due to other internal
transmission concerns such as stuck
valves or damaged friction material. May
flash TCIL.
GO to Pinpoint Test A
P0781
b
SSA, SSB or
Internal
Transmission
Components
1-2 shift error. Engine rpm drop not detected
when 1-
2 shift was commanded by
PCM.
Incorrect gear selection depending on
failure mode and transmission range
selector lever position. Refer to the
Solenoid Operation Chart. Shift errors
may also be due to other internal
transmission concerns such as stuck
valves or damaged friction material. May
flash TCIL.
GO to Pinpoint Test A.
P0782
b
SSA, SSB or
Internal
Transmission
Components
2-3 shift error. Engine rpm drop not detected
when 2-
3 shift was commanded by
PCM.
Incorrect gear selection depending on
failure mode and transmission range
selector lever position. Refer to the
Solenoid Operation Chart. Shift errors
may also be due to other internal
transmission concerns such as stuck
GO to Pinpoint Test A.
Page
3
of
33
2002 F
-
150 Workshop Manual
9/17/2010
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