Pinpoint Test A: The Speed Control Is Inoperative
WARNING: This page is about a different car, the 2009 Ford Econoline. However, it is still accessible from the selected car via links, so may be relevant.
- A1 CHECK FOR DTCs
- Review the recorded DTCs from the PCM self-test.
- Are any non-speed control DTCs recorded?
- Yes: REFER to the INTRODUCTION - GASOLINE MODELS article or INTRODUCTION - 6.0L DIESEL - E-SERIES article. REPAIR all PCM DTCs and RETEST the speed control.
- No: GO to A2 .
- A2 CHECK THE VEHICLE SPEED
- Check for correct operation of the speedometer.
- Does the speedometer operate correctly?
- Yes:
For gasoline engines, GO to A3
.
For diesel engines, GO to A5.
- No: REFER to INSTRUMENTATION, MESSAGE CENTER, AND WARNING CHIMES article to diagnose the speedometer.
- A3 VERIFY PCM CONFIGURATION
- Enter the following diagnostic mode on the scan tool: Programmable Parameters.
- Verify that the speed control is enabled in the PCM.
- Is the speed control enabled?
- Yes: GO to A4 .
- No: Enable the speed control in the PCM using the scan tool programmable parameters menu.
- A4 CHECK THE STOPLAMP SWITCH (BOO1 AND BOO2) PIDs
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: PCM DataLogger.
- Monitor the PCM PIDs BOO1 (brake pedal top travel) and BOO2 (brake pedal bottom travel) while applying and releasing the brake pedal as follows:BRAKE PEDAL POSITION REFERENCE CHART
Brake Pedal Position BOO1 PID BOO2 PID Released Off Off Applied lightly On Off Applied firmly On On - Do the PID values agree with the brake pedal position?
- Yes:
For vehicles equipped with factory Trailer Brake Control (TBC), GO to A6.
Otherwise, GO to A7.
- No: Go To PINPOINT TEST B .
- A5 CHECK THE STOPLAMP SWITCH (BOO) AND BRAKE PRESSURE SWITCH (BPA) PIDs
- Enter the following diagnostic mode on the scan tool: PCM DataLogger.
- Monitor the PCM PIDs BOO (brake pedal top travel) and BPA (brake pressure switch) while applying and releasing the brake pedal as follows:BRAKE PEDAL POSITION REFERENCE CHART
Brake Pedal Position BOO PID BPA PID Released Off Off Applied lightly On Off Applied firmly On On - Do the PID values agree with the brake pedal position?
- Yes: GO to A7.
- No: Go To PINPOINT TEST C .
- A6 CHECK THE BRAKE FLUID PRESSURE TRANSDUCER PID
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: PCM DataLogger.
- With the brake pedal released, monitor the PCM (BFP) PID.
- Does the voltage read between 0.35-0.65 volts?
- Yes: GO to A7 .
- No: REFER to AUXILIARY BRAKE SYSTEM article to diagnose the brake fluid pressure transducer.
- A7 CHECK THE PRNDL DISPLAY
- Apply the parking brake.
- Ignition ON.
- Monitor the PRNDL display.
- Select DRIVE.
- Does the PRNDL display agree with the transmission range selector lever position?
- Yes: GO to A8 .
- No: REFER to INSTRUMENTATION, MESSAGE CENTER, AND WARNING CHIMES article to continue diagnosis of the PRNDL.
- A8 CHECK THE SPEED CONTROL SWITCH
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: PCM DataLogger.
- Press each speed control switch button while monitoring the speed control switch PID (SCCS).SPEED CONTROL SWITCH REFERENCE CHART
Speed Control Switch SCCS PID Value - NONE Pressed RES RESUME OFF Off ON On SET/ACCEL SET/+ COAST SET/- - Does the PID value agree with the switch position?
- Yes: GO to A9 .
- No:
If only one switch does not display the correct PID value, INSTALL a new speed control switch. REFER to SPEED CONTROL SWITCH . CLEAR the DTCs. TEST the system for normal operation.
Otherwise, Go To PINPOINT TEST D .
- A9 CHECK FOR CORRECT PCM OPERATION
- Disconnect all the PCM connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the PCM connectors and make sure they are seated 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 - GASOLINE ENGINES article or ELECTRONIC ENGINE CONTROLS - DIESEL ENGINE article . 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.