P0581
DTC P0581
CIRCUIT DESCRIPTION
The cruise control switch is an input to the engine control module (ECM). The ECM monitors the cruise control set/coast and resume/accelerate switch signal circuit in order to detect when a cruise control function has been requested. The ECM detects a specific voltage signal on the cruise control set/coast and resume/accelerate switch signal circuit when a cruise control function switch is activated, with each switch having a different predetermined voltage value.
DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC P0581 Cruise Control Multifunction Switch High Voltage
CONDITIONS FOR RUNNING THE DTC
- The ignition is ON.
- The cruise control on/off switch is ON.
CONDITIONS FOR SETTING THE DTC
This DTC sets when the ECM detects that the voltage on the cruise control set/coast and resume/accelerate switch signal circuit is greater than 3.5 volts for greater than 1.5 seconds.
The ECM runs this diagnostic every 0.05 seconds.
ACTION TAKEN WHEN THE DTC SETS
- The ECM stores the DTC information into memory when the diagnostic runs and fails.
- The malfunction indicator lamp (MIL) will not illuminate.
- The ECM records the operating conditions at the time the diagnostic fails. The ECM stores this information in the Failure Records.
- The cruise control is disabled.
CONDITIONS FOR CLEARING THE MIL/DTC
- A last test failed, or the current DTC, clears when the diagnostic runs and does not fail.
- A history DTC clears after 40 consecutive warm-up cycles, if failures are not reported by this or any other emission related diagnostic.
- Use a scan tool in order to clear the MIL/DTC.
DIAGNOSTIC AIDS
For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections.
TEST
