GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Saturn 🢒 2004 🢒 ION 🢒 Engine 🢒 Engine Controls - 2.2L (L61) 🢒 DTC P0573

DTC P0573 2.2L


Object Number: 891298 Size: MF

Circuit Description

The torque converter clutch (TCC)/brake switch is a normally closed switch. When the TCC/brake switch circuit is closed, brake pedal released, the engine control module (ECM) senses ignition voltage on the TCC brake switch/cruise control release signal circuit. If the ECM does not sense a voltage on the TCC brake Switch/cruise control release signal circuit when the TCC/brake switch should be closed, brake pedal released, this DTC sets.

Conditions for Running the DTC
    • Vehicle has cycled from 0-60 km/h (0-37 mph) 3 times in 1 ignition cycle.
    • Continuous once the previous criteria have been met.

Conditions for Setting the DTC

The ECM does not detect voltage on the TCC brake switch/cruise control release signal circuit when the switch should be closed, with the brake pedal released.

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.

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

Important: 

   • Verify that the TCC/brake switch is adjusted properly. Refer to adjustment procedure.
   • Test drive the vehicle if a switch or circuit condition cannot be located. An intermittent condition may be duplicated during a test drive.
   • For an intermittent, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Test Description

The number below refers to the step number on the diagnostic table.

  1. This step determines if the fault is present.

Step

Action

Yes

No

Connector End View References: Cruise Control Connector End Views

1

Did you perform the Diagnostic System Check -- Cruise Control?

Go to Step 2

Go to Diagnostic System Check - Cruise Control

2
  1. Connect a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Monitor the cruise brake switch parameter in the engine control module (ECM) data list while depressing the brake pedal.

Does the cruise brake switch parameter indicate Released?

Go to Step 3

Go to Diagnostic Aids

3
  1. Turn OFF the ignition.
  2. Disconnect the TCC/brake switch harness connector.
  3. Turn ON the ignition, with the engine OFF.
  4. Observe the cruise brake switch parameter in the idle/speed control data list.

Does the cruise control brake switch parameter indicate Applied?

Go to Step 5

Go to Step 4

4

Inspect TCC brake switch/cruise control release signal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the problem?

Go to Step 7

--

5

Inspect the TCC/brake switch for proper adjustment. Refer to Cruise Release Switch Adjustment .

Did you find and correct the condition?

Go to Step 7

--

6

Replace the TCC/brake switch. Refer to Cruise Control Release Switch Replacement .

Did you complete the repair?

Go to Step 7

Go to Step 6

7
  1. Use a scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

Go to Step 2

System OK