Scheme 2
| Item | Description |
|---|---|
| 1 | Clutch pedal cruise control deactivation switch Comments |
Overview
The cruise control system is controlled by the PCM.
The cruise control mode is selected from the steering wheel mounted switches (ON/OFF, SET+, SET- and CAN/RES), which are integrated into the LH steering wheel switch.
The cruise control system maintains a selected vehicle speed between 29 kmh (18 mph) and the maximum limited vehicle speed. When a MyKey® restricted key is in use and max speed limiter is turned on, vehicle speed is limited to 129 kmh (80 mph).
During normal driving, the vehicle speed can vary slightly from the set speed due to road conditions. The vehicle speed can fluctuate when driving up and down a steep hill. If the vehicle speed decreases more than 16 kmh (10 mph) below the set speed, the cruise control disengages.
Scheme 3
Cruise Control Operation
The cruise control functions include
- turning on the cruise control system.
- setting and maintaining the desired vehicle speed.
- accelerating the vehicle speed.
- coasting down to a lower speed.
- resuming the prior vehicle speed.
- turning off the cruise control system.
Hardwired inputs to the PCM are
- Digital TR sensor
- BPP switch assembly (contains the stoplamp switch and cruise control deactivator switch)
- Clutch pedal cruise control deactivator switch (if equipped)
- APP sensor
Hardwired outputs of the PCM are
- Electronic Throttle Body (ETB) command
The vehicle speed is controlled by the PCM through the Electronic Throttle Control (ETC) subsystem.
The cruise control system provides self-diagnostics. Cruise control is disabled anytime an error is detected in the system. No IPC indicator or message center messages are displayed when faults occur. Fault codes are logged by the PCM or SASM.
An Electronic Throttle Control (ETC) system fault also causes the cruise control system to be disabled. In this case, an Electronic Throttle Control (ETC) system powertrain malfunction (wrench) warning indicator is displayed.
Additionally, certain conditions cause the cruise control system to deactivate
- Transmission gear selector is placed into a position other than D or OD
- Cruise control set speed is overridden with the accelerator pedal for a period longer than 5 minutes
- Cruise control switch is pressed or stuck longer than 2 minutes
- Clutch pedal depressed (if equipped)
- ABS fault
Diagnostic Overview
Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.
REFER to: DIAGNOSTIC METHODS .
Refer to CRUISE CONTROL for schematic and connector information.
Normal Operation and Fault Conditions
Refer to: STEERING WHEEL AND COLUMN ELECTRICAL COMPONENTS - SYSTEM OPERATION AND COMPONENT DESCRIPTION .
Refer to: Cruise Control - System Operation and Component Description .
Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.
REFER to: DIAGNOSTIC METHODS .
Refer to CRUISE CONTROL for schematic and connector information.
Refer to: Cruise Control - System Operation and Component Description .
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| P0504 | Brake Switch A / B Correlation | A DTC that sets when the PCM does not sense the correct sequence of the brake pedal input signal from both the cruise control deactivator and stoplamp switches when the brake pedal is pressed and released. |
| P0572 | Brake Switch A Circuit Low | A DTC that sets when the PCM detects an open in the stoplamp switch signal. The PCM monitors the vehicle speed, the engine speed, the engine torque and the stoplamp input during start and stop driving cycles. If the stoplamp switch input to the PCM is always off during start and stop driving cycles, this DTC sets in continuous memory. |
| P0573 | Brake Switch A Circuit High | A DTC that sets when the PCM detects a short to voltage on the stoplamp switch signal. The PCM monitors the vehicle speed, the engine speed, the engine torque and the stoplamp switch input during start and stop driving cycles. If the stoplamp lamp switch input to the PCM is always on during start and stop driving cycles, this DTC sets in continuous memory. |
| P1703 | Brake Switch Out Of Self - Test Range | A DTC that sets in the PCM during the self-test when the stoplamp switch input signal is high or does not cycle high and low. |
DTC FAULT TRIGGER CONDITIONS
Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.
REFER to: DIAGNOSTIC METHODS .
Refer to CRUISE CONTROL for schematic and connector information.
Refer to: Cruise Control - System Operation and Component Description .
Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.
REFER to: DIAGNOSTIC METHODS .
Refer to CRUISE CONTROL for schematic and connector information.
Refer to: Cruise Control - System Operation and Component Description .
Note. Jump (push) starting the engine will cause an engine RPM correlation error when the engine rotates without a starter motor crank command. Incorrectly installed or aftermarket alarm systems may induce this fault, also.
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| P0833 | Clutch Pedal Switch B Circuit | A DTC that sets when the PCM receives the vehicle speed input, indicating movement and does not detect the switching input signal from the clutch pedal speed control deactivator switch. This condition disables cruise control. |
DTC FAULT TRIGGER CONDITIONS
See also:
• DRIVER AIRBAG