DTC P1574. Saturn VUE

For 1990-2009 cars only

Makes 🢒 Saturn 🢒 2006 🢒 VUE - FWD 🢒 Accessories 🢒 Cruise Control 🢒 DTC P1574

DTC P1574 2.2L

Circuit Description

This diagnostic test functions on the assumption that a sudden decrease in vehicle speed is caused by a brake pedal application. When the engine control module (ECM) 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 cruise/brake switch without a transition of the stop lamp switch, the ECM sets DTC P1574.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P1574 Stop Lamp Switch Circuit

Conditions for Running the DTC

•	DTCs P0502, P0503, P0719, and P0724 are not set.

•	The engine speed is greater than 700 RPM.

•	The traction control system or the antilock brake system are not active and have not failed.

•	The vehicle speed is greater than 48 km/h (30 mph) in order to enable the diagnostic.

•	The diagnostic will disable when the wheel speed is less than 16 km/h (10 mph).

Conditions for Setting the DTC

•	The vehicle speed decreases by at least 4.2 km/h (2.6 mph) within 0.25 second.

•	The ECM detects a cruise/brake transition.

•	The ECM does not detect a stop lamp switch transition.

Action Taken When the DTC Sets

•	The ECM sets the stop lamp switch status to released.

•	The ECM disables the operation of the cruise control system.

Conditions for Clearing the DTC

•	A history DTC will clear after 40 malfunction-free warm-up cycles.

•	The ECM receives a clear code command from the scan tool.

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	Go to Diagnostic System Check - Vehicle
2	Install a scan tool. Turn ON the ignition, with the engine OFF. Press the brake pedal. With the scan tool, observe the Brake Switch parameter in the powertrain control module (PCM) General Info Inputs data list. Does the Brake Pedal Switch parameter display Released?	Go to Step 3	Go to Diagnostic Aids
3	Do the stop lamps operate properly?	Go to Step 4	Go to Stop Lamps Inoperative
4	Test the stop lamp switch signal circuit for an open or for a high resistance. Refer to Circuit Testing and Wiring Repairs . Did you complete the repair?	Go to Step 7	Go to Step 5
5	Inspect for poor connections at the harness connector of the engine control module (ECM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition?	Go to Step 7	Go to Step 6
6	Replace the ECM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement?	Go to Step 7	--
7	Use the scan tool in order to clear the DTCs. Operate the vehicle within the Conditions for Running the DTC. Does the DTC reset?	Go to Step 2	System OK

DTC P1574 3.5L