Scheme 1
Scheme 2
Scheme 3
| Callout | Component Name |
|---|---|
| 1 | Turn Signal/Multifunction Switch |
| 2 | Windshield Wiper/Washer Switch |
| 3 | C201 |
Circuit/System Description
The cruise control resume/accel switch is an input to the powertrain control module (PCM)/engine control module (ECM). The PCM/ECM uses the cruise control resume/accel switch signal circuit in order to detect when the driver has requested to accelerate the set vehicle speed or to resume the cruise control system. The PCM/ECM detects a voltage signal on the cruise control resume/accel switch signal circuit when the switch is applied. This DTC sets if the PCM/ECM senses voltage on the cruise control resume/accel switch signal circuit for longer than 90 seconds.
The cruise control set/coast switch is an input to the powertrain control module (PCM)/engine control module (ECM). The PCM/ECM uses the cruise control set/coast switch signal circuit in order to detect when the driver has requested to set the vehicle speed or to decelerate the vehicle speed. The PCM/ECM detects a voltage signal on the cruise control set/coast switch signal circuit when the switch is applied. This DTC sets if the PCM/ECM senses voltage on the cruise control set/coast switch signal circuit for longer than 90 seconds.
This diagnostic test functions on the assumption that a sudden decrease in vehicle speed is caused by a brake pedal application. When the powertrain control module (PCM) detects that there is a 4.2 km/h (2.6 mph) or greater decrease in vehicle speed within 0.25 second and a transition of the torque converter clutch (TCC) brake switch without a transition of the stop lamp switch, the PCM sets DTC P1574.
The powertrain control module (PCM)/engine control module (ECM) monitors the cruise control indicator switch. When the cruise on/off switch is switched ON, the cruise control switch is closed and the signal circuit is high. When the cruise on/off switch is switched OFF, the cruise control switch is open and the signal circuit is low.
The powertrain control module (PCM)/engine control module (ECM) monitors the cruise control indicator switch. When the cruise on/off switch is switched ON, the cruise control switch is closed and the signal circuit is high. When the cruise on/off switch is switched OFF, the cruise control switch is open and the signal circuit is low.