Circuit Description
The cruise control module uses the cruise engaged circuit to request cruise control. If improper conditions are present, the powertrain control module (PCM) will disable cruise control via the cruise inhibit control circuit. During cruise control, if the PCM detects a vehicle speed above the calibrated value, the PCM will inhibit the cruise control system, and set DTC P0574.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0574 Vehicle Speed Too High Cruise Control Disabled
Conditions for Running the DTC
| • | The cruise control is enabled. |
| • | The cruise control is engaged. |
Conditions for Setting the DTC
The PCM detects a vehicle speed above 176 km/h (110 mph).
Action Taken When the DTC Sets
| • | The PCM disables the cruise control. |
| • | The PCM will not illuminate the malfunction indicator lamp (MIL). |
| • | The PCM will store the conditions present when the DTC set as Fail Records data only. |
Conditions for Clearing the DTC
| • | The History DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction. |
| • | The DTC can be cleared by using the scan tool Clear DTC Information function. |
Diagnostic Aids
This diagnostic trouble code (DTC) is an information DTC only. The DTC indicates the reason that the PCM disabled the cruise control system. Be sure to check with the customer for the conditions that set the DTC.
Reviewing the Fail Records vehicle mileage since the diagnostic test last failed may assist in diagnosing the condition. The Fail Records information may help in determining how often the condition occurs that set the DTC.
Step | Action | Yes | No |
|---|---|---|---|
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 | Since most occurrences of DTC P0574 are caused by wheel spin due to icy, wet or slippery conditions, verify the conditions under which the DTC set with the customer. Did the road conditions cause this DTC to set? | Go to Step 3 | Go to Diagnostic Aids |
3 | Explain system operation to the customer and clear this DTC. Is the action complete? | System OK | -- |
