Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD2005CROWN VICTORIA SPECIAL EDITIONREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTCRUISE CONTROL SYSTEMSDIAGNOSIS AND TESTINGSPEED CONTROLPINPOINT TESTSPINPOINT TEST A: THE SPEED CONTROL IS INOPERATIVE
2005 Ford Crown Victoria Special Edition
Pinpoint Test A: The Speed Control is Inoperative
2005 Ford Crown Victoria Special EditionSECTION Pinpoint Test A: The Speed Control is Inoperative
- A1 RETRIEVE THE RECORDED POWERTRAIN CONTROL MODULE (PCM) DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND SELF-TESTS
- Check for recorded PCM DTCs from the continuous and on-demand self-tests.
- Are any DTCs recorded?
- Yes : REFER to the POWERTRAIN CONTROL MODULE (PCM) DIAGNOSTIC TROUBLE CODE (DTC) INDEX .
- No : GO to A2.
- A2 CHECK THE SPEED CONTROL SWITCHES
- Key in OFF position.
- Disconnect: PCM C175b.
- Measure the resistance between the PCM C175b-19, circuit 151 (LB/BK), harness side and the PCM C175b-30, circuit 848 (DG/OG), harness side while pressing the speed control buttons as follows:SPEED CONTROL SWITCHES RESISTANCE SPECIFICATION
Speed Control Switch Resistance Value OFF Less than 5 ohms COAST 276 - 324 ohms SET/ ACCEL 552 - 648 ohms RESUME 1,021 - 1,199 ohms ON 1,941 - 2,278 ohms No switch pressed 3,965 - 4,655 ohms - Are the speed control switch resistance values OK?
- Yes : GO to A3.
- No : INSTALL a new speed control switch. REFER to SPEED CONTROL SWITCH . TEST the system for normal operation.
- A3 CHECK THE DIGITAL TRANSMISSION RANGE (TR) SENSOR
- Connect: PCM C175b.
- Key in ON position.
- Enter the following diagnostic mode on the diagnostic tool: PID Data Monitor and Record.
- Monitor the TR sensor PID.
- Select DRIVE.
- Does the PID value agree with the transmission range selector lever position?
- Yes : GO to A4.
- No : REFER to AUTOMATIC TRANSAXLE/TRANSMISSION to continue diagnosis of the digital TR sensor.
- A4 CHECK THE DIGITAL TR SENSOR FOR CORRECT ALIGNMENT WARNING: If equipped with fire suppression system, depower the system. For important safety warnings and procedures, refer to FIRE SUPPRESSION SYSTEM .
- Check the digital TR sensor alignment. Refer to AUTOMATIC TRANSAXLE/TRANSMISSION .
- Is the digital TR sensor aligned correctly?
- Yes : GO to A5.
- No : ADJUST the digital TR sensor. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION . If equipped with fire suppression system, GO to A7. TEST the system for normal operation.
- A5 CHECK THE VEHICLE SPEED NOTE: This step may require an assistant
- Enter the following diagnostic mode on the diagnostic tool: Anti-Lock Brake System (ABS) Wheel Speed PID.
- Monitor and record the ABS module wheel speed PID while driving the vehicle at 48 km/h (30 mph) as indicated on the speedometer.
- Enter the following diagnostic mode on the diagnostic tool: PCM Vehicle Speed PID.
- Monitor and record the PCM vehicle speed PID while driving the vehicle at 48 km/h (30 mph).
- Does the speed indicated by the ABS module wheel speed PID match the PCM vehicle speed PID?
- Yes : GO to A6.
- No : See INTRODUCTION - GASOLINE article to DIAGNOSE the output shaft sensor (OSS) signal.
- A6 CHECK FOR CORRECT PCM OPERATION
- Disconnect all the PCM connectors.
- Check for:
- corrosion
- pushed-out pins
- Connect all the PCM connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
- Yes : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS . If equipped with fire suppression system, GO to A7. TEST the system for normal operation.
- No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. If equipped with fire suppression system, GO to A7.
- A7 REPOWER THE FIRE SUPPRESSION SYSTEM WARNING: If equipped with fire suppression system, repower the system. For important safety warnings and procedures, refer to FIRE SUPPRESSION SYSTEM .
- Verify that the fire suppression system is repowered. For additional information, refer to FIRE SUPPRESSION SYSTEM .
- Is the fire suppression system repowered?
- Yes : Fire suppression system repowering is complete.
- No : REFER to FIRE SUPPRESSION SYSTEM for fire suppression system depowering and repowering procedure.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.