DTC P0571 2.2L
Circuit Description
The cruise/brake switch is a normally closed switch and the stop lamp switch is a normally open switch. When the brake pedal is released, the engine control module (ECM) detects a high voltage signal on the cruise/brake switch signal circuit and a low signal voltage signal on the stop lamp switch signal circuit. When the brake pedal is applied, the cruise/brake switch opens and the stop lamp switch closes. The ECM detects a low voltage signal on the cruise brake switch signal circuit and a high voltage signal on the stop lamp switch signal circuit.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0571 Cruise Control Brake Switch Circuit
Conditions for Running the DTC
| • | The ignition is ON. |
| • | The Traction Control System (TCS) or the Antilock Brake System (ABS) have not failed. |
Conditions for Setting the DTC
| • | The ECM detects a transition of the stop lamp switch without detecting a transition of the cruise/brake switch during a deceleration event. |
| • | This diagnostic run continuously with the ignition ON. |
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 system is disabled. |
Conditions for Clearing the DTC
| • | A last test failed, or current DTC, clears when the diagnostic runs and does not fail. |
| • | A history DTC will clear after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic. |
| • | Use a scan tool in order to clear the DTC. |
Diagnostic Aids
In order to avoid a misdiagnosis, perform the following:
| • | Inspect for proper operation of the stop lamps. Refer to Exterior Lighting Systems Description and Operation . |
| • | Inspect for proper adjustment of the stop lamps. Refer to Stop Lamp Switch Adjustment . |
| • | Inspect for proper adjustment of the cruise control release switch. Refer to Cruise Release Switch Adjustment . |
| • | For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections . |
Step | Action | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Cruise Control Schematics Connector End View Reference: Cruise Control Connector End Views or Lighting Systems Connector End Views | |||||||||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |||||||
2 |
Does the Cruise Brake Switch parameter display Released? | Go to Step 3 | Go to Step 4 | ||||||
3 |
Does the Cruise Brake Switch parameter display Applied? | Go To Diagnostic Aids | Go to Step 6 | ||||||
4 |
Does the test lamp illuminate? | Go to Step 5 | Go to Step 11 | ||||||
5 |
Does the Cruise Brake Switch parameter display Released? | Go to Step 9 | Go to Step 8 | ||||||
6 |
Does the Cruise Brake Switch parameter display Applied? | Go to Step 9 | Go to Step 7 | ||||||
7 | Test the cruise/brake switch signal circuit for a short to voltage. Refer Circuit Testing and to Wiring Repairs . Did you find and correct the condition? | Go to Step 14 | Go to Step 10 | ||||||
8 | Test the cruise/brake switch signal circuit for the following:
Refer Circuit Testing and to Wiring Repairs . Did you find and correct the condition? | Go to Step 14 | Go to Step 10 | ||||||
9 | Inspect for poor connections at the harness connector of the cruise/brake switch. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs . Did you find and correct the condition? | Go to Step 14 | Go to Step 12 | ||||||
10 | Inspect for poor connections at the harness connector of the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs . Did you find and correct the condition? | Go to Step 14 | Go to Step 13 | ||||||
11 | Repair the following in the ignition 1 voltage circuit.
Refer Circuit Testing and to Wiring Repairs . Did you complete the repair? | Go to Step 14 | |||||||
12 | Replace the cruise/brake switch. Refer to Cruise Control Release Switch Replacement . Did you complete the replacement? | Go to Step 14 | -- | ||||||
13 | Replace the engine control module (ECM). Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 14 | -- | ||||||
14 |
Does the DTC reset? | Go to Step 2 | System OK | ||||||
DTC P0571 3.5L
Circuit Description
The cruise/brake switch is a normally closed switch and the stop lamp switch is a normally open switch. When the brake pedal is released, the powertrain control module (PCM) detects a high voltage signal on the cruise/brake switch signal circuit and a low signal voltage signal on the stop lamp switch signal circuit. When the brake pedal is applied, the cruise/brake switch opens and the stop lamp switch closes. The PCM detects a low voltage signal on the cruise brake switch signal circuit and a high voltage signal on the stop lamp switch signal circuit.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0571 Cruise Control Brake Switch Circuit
Conditions for Running the DTC
| • | The ignition is ON. |
| • | The Traction Control System (TCS) or the Antilock Brake System (ABS) have not failed. |
Conditions for Setting the DTC
| • | The PCM detects a transition of the stop lamp switch without detecting a transition of the cruise/brake switch during a deceleration event. |
| • | This diagnostic run continuously with the ignition ON. |
Action Taken When the DTC Sets
| • | The PCM stores the DTC information into memory when the diagnostic runs and fails. |
| • | The service vehicle soon indicator may illuminate. |
| • | The malfunction indicator lamp (MIL) will not illuminate. |
| • | The PCM records the operating conditions at the time the diagnostic fails. The PCM stores this information in the Failure Records. |
| • | The cruise control system is disabled. |
| • | The Service Vehicle Soon (SVS) light may be illuminated. |
Conditions for Clearing the DTC
| • | A last test failed, or current DTC, clears when the diagnostic runs and does not fail. |
| • | A history DTC will clear after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic. |
| • | Use a scan tool in order to clear the DTC. |
Diagnostic Aids
In order to avoid a misdiagnosis, perform the following:
| • | Inspect for proper operation of the stop lamps. Refer to Exterior Lighting Systems Description and Operation . |
| • | Inspect for proper adjustment of the stop lamps. Refer to Stop Lamp Switch Adjustment . |
| • | Inspect for proper adjustment of the cruise control release switch. Refer to Cruise Release Switch Adjustment . |
| • | For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections . |
Step | Action | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Cruise Control Schematics Connector End View Reference: Cruise Control Connector End Views or Lighting Systems Connector End Views | |||||||||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |||||||
2 |
Does the Cruise Brake Switch parameter display Released? | Go to Step 3 | Go to Step 4 | ||||||
3 |
Does the Cruise Brake Switch parameter display Applied? | Go to Diagnostic Aids | Go to Step 6 | ||||||
4 |
Does the test lamp illuminate? | Go to Step 5 | Go to Step 11 | ||||||
5 |
Does the Cruise Brake Switch parameter display Released? | Go to Step 9 | Go to Step 8 | ||||||
6 |
Does the Cruise Brake Switch parameter display Applied? | Go to Step 9 | Go to Step 7 | ||||||
7 | Test the cruise/brake switch signal circuit for a short to voltage. Refer Circuit Testing and to Wiring Repairs . Did you find and correct the condition? | Go to Step 14 | Go to Step 10 | ||||||
8 | Test the cruise/brake switch signal circuit for the following:
Refer Circuit Testing and to Wiring Repairs . Did you find and correct the condition? | Go to Step 14 | Go to Step 10 | ||||||
9 | Inspect for poor connections at the harness connector of the cruise/brake switch. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs . Did you find and correct the condition? | Go to Step 14 | Go to Step 12 | ||||||
10 | Inspect for poor connections at the harness connector of the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs . Did you find and correct the condition? | Go to Step 14 | Go to Step 13 | ||||||
11 | Repair the following in the ignition 1 voltage circuit.
Refer Circuit Testing and to Wiring Repairs . Did you complete the repair? | Go to Step 14 | |||||||
12 | Replace the cruise/brake switch. Refer to Cruise Control Release Switch Replacement . Did you complete the replacement? | Go to Step 14 | -- | ||||||
13 | Replace the PCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 14 | -- | ||||||
14 |
Does the DTC reset? | Go to Step 2 | System OK | ||||||
