Circuit Description
The cruise control module uses the cruise engaged circuit to request cruise control. If incorrect conditions are present, the PCM will disable cruise control via the cruise inhibit control circuit. During cruise control, if the vehicle enters active traction control, the PCM will inhibit the cruise control system, and set DTC P1570.
Conditions for Running the DTC
| • | The cruise control is enabled. |
| • | The cruise control is engaged. |
Conditions for Setting the DTC
Traction control is active.
Action Taken When the DTC Sets
| • | The PCM disables cruise control. |
| • | The PCM will not illuminate the malfunction indicator lamp (MIL). |
| • | The PCM will store conditions which were present when the DTC set as Fail Records data only. occurs |
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 Diagnostic Trouble Code (DTC) Clearing or 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 information may help determine how often the condition that set the DTC occurs.
Step | Action | Yes | No |
|---|---|---|---|
1 | Did you perform A Diagnostic System Check - Cruise Control? | Go to Step 2 | |
2 | Are any ABS/TCS DTCs set? | Go to Step 3 | |
3 | Since most occurrences of DTC P1570 are caused by conditions that causes traction control to activate during cruise control. Check with the customer to verify the conditions under which the DTC set. Did the road conditions cause this DTC to set? | Go to Step 4 | Go to Diagnostic Aids |
4 | Explain system operation to the customer and clear this DTC. Is the action complete? | System OK | -- |
