Mechanics

F150 SPEEDOMETER NOT WORKING

2003 Ford F-150

Computer problem
2003 Ford F150 V8 Four Wheel Drive Automatic 55000 miles

Speedometer reads 100mph at 0 to 1500 rpm and indicates 80mph above 1500 rpm. No other mph readings will indiate on the speedometer. Mileage indicator records miles driven and appears to be working correctly. Check engine light is not on. Code reading is 0. I suspect a speed sensor, but unsure where it is located and if, indeed, this is the problem. Your input is greatly appreciated.

Thank you and have a great weekend.
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Jackc1212
August 1, 2009.




Without having the Ford scantool, all you can do is remove the connectors at the back, check for pushed out or bent pins.
To enter the Instrument Cluster Dealer Test Mode, depress and hold the instrument cluster SELECT/RESET button and then turn the ignition switch to the RUN position. Continue pressing the SELECT/RESET button (five seconds) until tESt is displayed in the odometer. The SELECT/RESET button must be released within three seconds of the odometer displaying tESt to begin the dealer test mode. Depress the SELECT/RESET button to advance through the following steps until dtc is displayed. Depressing the SELECT/RESET button will display any continuous DTCs stored before proceeding to the next step.
Odometer Display Description
GAGE Activates gauge sweep of all gauges, then displays present gauge values. Also carries out the checksum tests on ROM and EE.
All segments illuminated Illuminates all odometer segments.
Bulb Illuminates all micro-controlled lamps and LEDs (low oil pressure/high coolant temperature, low fuel, service engine soon, brake, low range). Install a new bulb or LED as necessary.
R Returns to normal operation of all micro-controlled lamps and LEDs and displays hexadecimal value for ROM level.
EE Displays hexadecimal value for EE level.
Dt Displays hexadecimal coding of final manufacturing test date.
Dtc Displays continuous DTCs. Pressing the SELECT/RESET button will display any DTCs stored before proceeding to the next step.
EnG Displays the speed in mph. Speedometer will indicate present speed within tolerances. Display will show 0 if input is not received, if input received is invalid for one second or more, or if speed is 0.
M Displays the speed data (mph) received from the PCM via the SCP network. Displays the metric speed in kph. Speedometer will indicate present speed within tolerances. Display will show 0 if input is not received, if input received is invalid for one second or more, or if speed is 0.
TAc Displays the tachometer data received from the PCM via the SCP network. Tachometer will indicate present speed within tolerances. Display will show 0 if input is not received, if input received is invalid for one second or more, or if engine rpm is 0.
FUEL Displays the actual A/D fuel level. The fuel gauge will display a filtered fuel level value. This filter will keep the pointer from moving suddenly or erratically. If the value displayed is between 0 and 20, the circuit is shorted. Go To Pinpoint Test B.
255=open send +/-0
232=Full stop +/-10
215=Full mark +/-10
178=3/4 mark +/-8
138=1/2 mark +/-7
93=1/4 mark +/-5
41=E mark +/-4
54=" LOW FUEL" (0-59)
0-18=short (0-20 max.)

OIL Displays the code (0-255) for the oil pressure switch input to the instrument cluster. Displays the oil pressure reading input to the instrument cluster. Oil pressure gauge will indicate present oil pressure. Normal oil pressure (greater than 6 psi) will display a value between 000 and 176. A low oil pressure (less than 6 psi) or an inoperative engine oil pressure switch will display a value greater than 176.
DEGC Display of engine temperature in Degrees C input from cylinder head temperature sensor. If the value displayed is -40C, the SCP message for engine temperature has not been received for more than 5 seconds. Go To Pinpoint Test E.
49 C=" C" mark
60 C=Normal band start
120 C=Normal band end
119 C=Temperature warning indicator ON
" -40" C=No SCP Message for 5 sec

br Displays the brake fluid level input to the instrument cluster.
BAtt Displays the code (0-255) battery voltage input to the instrument cluster. Battery voltage gauge will indicate present battery voltage.
93-102=6.9-9.1 volts (low voltage)
115-124=8.5-10.7 volts (norm band start)
215-225=15.8-18 volts (norm band end)
230-241=16.9-19.1 volts (high voltage)

rhEo Displays the present hexadecimal value for the instrument cluster backlighting pulse width modulated (PWM) input to the instrument cluster.
Rhi
rhS
rho PWM input duty cycle.
SCP hexadecimal dimming step.
Output driver counts in hexadecimal format.
Cr Displays the present RUN/START sense input. Display will show -L with the ignition switch in the START position and -h with the ignition switch in the RUN position.
ALtF a Displays 8-bit hexadecimal value for alternate fuel level. Display will show a value between OO and FF if the message is received.
PA-PE7 Not used.
GAGE Repeats test display cycle.

A Refer to 413-01B (F250 only).

Turn the ignition switch to the OFF position or press and hold the SELECT/RESET button for three or more seconds and release to exit Instrument Cluster Dealer Test Mode. If no DTCs related to the concern are retrieved, proceed to the Symptom Chart to continue diagnostics.
Instrument Cluster Diagnostic Trouble Code (DTC) Index DTC Description Source Action
B1202 Fuel Sender Open Instrument Cluster Go To Pinpoint Test B.
B1204 Fuel Sender Short to Ground Instrument Cluster Go To Pinpoint Test B.
B1342 ECU is Defective Instrument Cluster CLEAR the DTCs. REPEAT the self-test. If DTC B1342, INSTALL a new instrument cluster. REFER to Instrument Cluster in this section. CLEAR the DTCs. REPEAT the self-test.
B2143 Odometer NVM Memory Failure Instrument Cluster INSTALL a new instrument cluster. REFER to Instrument Cluster in this section. CLEAR the DTCs. REPEAT the self-test.
C1284 Oil Pressure Switch Failure Instrument Cluster Go To Pinpoint Test D.
P1197 SELECT/RESET Switch Circuit Failure Instrument Cluster INSTALL a new instrument cluster. REFER to Instrument Cluster in this section. CLEAR the DTCs. REPEAT the self-test.
U1027 SCP (J1850) Invalid or Missing Data for Engine RPM PCM REFER to the Powertrain Control/Emissions Diagnosis (PC/ED) manual.
U1041 SCP (J1850) Invalid or Missing Data for Vehicle Speed PCM REFER to the Powertrain Control/Emissions Diagnosis (PC/ED) manual.
U1073 SCP (J1850) Invalid or Missing Data for Engine Coolant PCM REFER to the Powertrain Control/Emissions Diagnosis (PC/ED) manual.
U1123 SCP (J1850) Invalid or Missing Data for Odometer PCM REFER to the Powertrain Control/Emissions Diagnosis (PC/ED) manual.
U1131 SCP (J1850) Invalid or Missing Data for Fuel System AFCM REFER to the Powertrain Control/Emissions Diagnosis (PC/ED) manual.
U1132 SCP (J1850) Invalid or Missing Data for Odometer PCM REFER to the Powertrain Control/Emissions Diagnosis (PC/ED) manual

Merlin2021
Aug 1, 2009.
Thank you for the rapid reply. If after going through all these tests and it proves to be the speed sensor where on my 2003 Ford F150 4x4 will I find the sensor(s)
Thank you again

Tiny
Jackc1212
Aug 1, 2009.
There are two on yours, on on left side of the transmission, the other ont left rear tail of tranny.
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Merlin2021
Aug 2, 2009.

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