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Home >> Chrysler >> 2001 >> Sebring LX, 2D Convertible >> Repair and Diagnosis >> External Pages >> Different car >> Section 41 (Cruise Control Systems - Coupe) >> Auto-Cruise Control System Diagnosis >> Diagnostic Trouble Code Procedures >> DTC 11: Auto-cruise Vacuum Pump Drive System >> Diagnosis

DTC 11: Auto-cruise Vacuum Pump Drive System: Diagnosis

WARNING: This page is about a different car, the 2005 Dodge Stratus and 2005 Chrysler Sebring. However, it is still accessible from the selected car via links, so may be relevant.

Required Special Tool: 

  1. STEP 1. Measure the signal voltage at auto-cruise control-ECU connector C-21 by backprobing. 
    1. Do not disconnect auto-cruise control-ECU connector C-21.
    2. Turn the ignition switch to the "ON" position and the auto-cruise control MAIN switch to the "ON" position.
      Fig 1: Disconnecting Auto-Cruise Control-ECU Connector C-21
      G04539303Courtesy of DAIMLERCHRYSLER CORPORATION
    3. Measure the voltage between auto-cruise control-ECU connector C-21 terminal 7 and ground by backprobing.
      • The voltage should measure greater than 10 V. (When canceling constant speed driving with the auto-cruise control CANCEL switch).
    4. Measure the voltage between auto-cruise control-ECU connector C-21 terminal 8 and ground by backprobing.
      • The voltage should measure greater than 10 V. (When decelerating with the auto-cruise control SET switch while driving at constant speed).
        Fig 2: Measuring Voltage Between Auto-Cruise Control-ECU Connector C-21 Terminal 7 And Ground
        G04539304Courtesy of DAIMLERCHRYSLER CORPORATION
    5. Measure the voltage between auto-cruise control-ECU connector C-21 terminal 16 and ground by backprobing.
      • The voltage should measure battery positive voltage. (When the motor is stopped during a constant road speed).
    6. Turn the auto-cruise control MAIN switch to the "OFF" position and the ignition switch to the "LOCK" (OFF) position.

    Q: Are all of the measured voltages satisfied? 

    YES  : Check that DTC 11 is not set. If DTC 11 is not set, It can be assumed that this malfunction is intermittent. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS ). If DTC 11 is set, replace the auto-cruise control-ECU (Refer to AUTO-CRUISE CONTROL  ), and then go to  Step 5.

    NO:  Go to Step 2.

  2. STEP 2. Check auto-cruise control vacuum pump connector A-01, intermediate connector C-212 and auto-cruise control-ECU connector C-21 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Are the connectors and terminals in good condition? 

    YES  : Go to Step 3.

    NO:  Repair or replace the faulty connector. (Refer to , HARNESS CONNECTOR INSPECTION ). Go to  Step 5

    Fig 3: Checking Auto-Cruise Control Vacuum Pump Connector A-01
    G04539305Courtesy of DAIMLERCHRYSLER CORPORATION
    Fig 4: Checking Intermediate Connector C-212
    G04539306Courtesy of DAIMLERCHRYSLER CORPORATION
    Fig 5: Checking Auto-Cruise Control-ECU Connector C-21
    G04539307Courtesy of DAIMLERCHRYSLER CORPORATION
  3. STEP 3. Check the auto-cruise control vacuum pump. 
    1. Disconnect the vacuum hose from the auto-cruise control vacuum pump and connect a vacuum gauge to the vacuum pump.
    2. Disconnect the auto-cruise control vacuum pump connector A-01.
      Fig 6: Disconnecting Auto-Cruise Control Vacuum Pump Connector A-01
      G04539308Courtesy of DAIMLERCHRYSLER CORPORATION
    3. Check the auto-cruise control vacuum pump and valves according to the following procedure:
      • Connect the positive battery terminal to auto-cruise control vacuum pump connector A-01 terminal 1, and the negative battery terminal to terminals 2, 3, and 4. The vacuum gauge should read greater than 27 kPa (8.0 in.Hg).
      • The vacuum should be maintained when terminal 4 is disconnected from the negative battery terminal while terminals 1, 2, and 3 remain connected. The vacuum gauge should read 0 kPa (0 in.Hg) when terminal 2 is disconnected from the negative battery terminal while terminals 1, and 3 remain connected.
      • The vacuum should be maintained when terminal 4 is disconnected from the negative battery terminal while terminals 1, 2, and 3 remain connected. The vacuum gauge should read 0 kPa (0 in.Hg) when terminal 3 is disconnected from the negative battery terminal while terminals 1, and 2 remain connected.
    4. Connect the auto-cruise control vacuum pump connector A-01.
      Fig 7: Checking Auto-Cruise Control Vacuum Pump And Valves
      G04539309Courtesy of DAIMLERCHRYSLER CORPORATION

    Q: Are all of the above values satisfied? 

    YES  : Go to Step 4.

    NO:  Replace the auto-cruise control vacuum pump. (Refer to AUTO-CRUISE CONTROL  ). Go to  step 5.

  4. STEP 4. Check the harness wire between auto-cruise control vacuum pump connector A-01 terminal 2, 3, 4 and auto-cruise control-ECU connector C-21 terminal 7, 8, 16 for damage. 

    Q: Is the harness wire in good condition? 

    YES  : Check that DTC 11 is not set. If DTC 11 is not set, It can be assumed that this malfunction is intermittent. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS ). If DTC 11 is set, replace the auto-cruise control-ECU (Refer to AUTO-CRUISE CONTROL  ), and then go to Step 5.

    NO:  Repair the damaged harness wire. Go to Step 5.

    Fig 8: Checking Harness Wire Between Auto-Cruise Control Vacuum Pump Connector A-01
    G04539310Courtesy of DAIMLERCHRYSLER CORPORATION
    Fig 9: Checking Auto-Cruise Control-ECU Connector C-21
    G04539311Courtesy of DAIMLERCHRYSLER CORPORATION
  5. STEP 5. Check the diagnostic trouble codes. 

    Q: Is DTC 11 set? 

    YES  : Go to  Step 1.

    NO:  This procedure is complete.

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