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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 >> Symptom Procedures >> INSPECTION PROCEDURE 1: Communication with Scan Tool MB991502 is not Possible (Communication with the Auto-cruise Control-ECU Only is not Possible). >> Diagnosis

INSPECTION PROCEDURE 1: Communication with Scan Tool MB991502 is not Possible (Communication with the Auto-cruise Control-ECU Only is not Possible).: 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.
      Fig 1: Disconnecting Auto-Cruise Control-ECU Connector C-21
      G04539384Courtesy of DAIMLERCHRYSLER CORPORATION
    3. Measure the voltage between auto-cruise control-ECU connector C-21 terminal 6 and ground by backprobing.
      • The voltage should measure battery positive voltage.
    4. Turn the ignition switch to the "LOCK" (OFF) position.

    Q: Is the measured voltage battery positive voltage? 

    YES  : Go to  Step 4.

    NO:  Go to Step 2.

    Fig 2: Measuring Voltage Between Auto-Cruise Control-ECU Connector C-21 Terminal 6 And Ground
    G04539385Courtesy of DAIMLERCHRYSLER CORPORATION
  2. STEP 2. Check auto-cruise control-ECU connector C-21 and Junction block connector C-308 and C-311 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 9.

    Fig 3: Checking Auto-Cruise Control-ECU Connector C-21
    G04539386Courtesy of DAIMLERCHRYSLER CORPORATION
    Fig 4: Checking Junction Block Connector C-308 And C-311
    G04539387Courtesy of DAIMLERCHRYSLER CORPORATION
  3. STEP 3. Check the harness wire between ignition switch and auto-cruise control-ECU connector C-21 terminal 6 for damage. 

    Q: Is the harness wire in good condition? 

    YES  : It can be assumed that this malfunction is intermittent. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS ). Go to  Step 9.

    NO:  Go to  Step 9.

    Fig 5: Checking Harness Wire Between Ignition Switch And Auto-Cruise Control-ECU Connector C-21
    G04539388Courtesy of DAIMLERCHRYSLER CORPORATION
  4. STEP 4. Measure the ground circuit 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.
      Fig 6: Disconnecting Auto-Cruise Control-ECU Connector C-21
      G04539389Courtesy of DAIMLERCHRYSLER CORPORATION
    3. Measure the voltage between auto-cruise control-ECU connector C-21 terminal 14 and ground by backprobing.
      • The voltage should measure 0.5 volt or less.
    4. Turn the ignition switch to the "LOCK" (OFF) position.

    Q: Is the measured voltage 0.5 volts or less? 

    YES  : Go to  Step 7.

    NO:  Go to Step 5.

    Fig 7: Measuring Voltage Between Auto-Cruise Control-ECU Connector C-21 Terminal 14 And Ground
    G04539390Courtesy of DAIMLERCHRYSLER CORPORATION
  5. STEP 5. Check auto-cruise control-ECU connector C-21 for loose, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Is the connector and terminals in good condition? 

    YES  : Go to Step 6.

    NO:  Repair or replace the faulty connector. (Refer to , HARNESS CONNECTOR INSPECTION ). Go to  Step 9.

    Fig 8: Checking Auto-Cruise Control-ECU Connector C-21
    G04539391Courtesy of DAIMLERCHRYSLER CORPORATION
  6. STEP 6. Check the harness wire between auto-cruise control-ECU connector C-21 terminal 14 and ground for damage. 

    Q: Is the harness wire in good condition? 

    YES  : It can be assumed that this malfunction is intermittent. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS ). Go to  Step 9.

    NO:  Repair the damaged harness wire. Go to  Step 9.

    Fig 9: Checking Harness Wire Between Auto-Cruise Control-ECU Connector C-21
    G04539392Courtesy of DAIMLERCHRYSLER CORPORATION
  7. STEP 7. Check auto-cruise control-ECU connector C-21 and data link connector C-26 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 8.

    NO:  Repair or replace the faulty connector. (Refer to , HARNESS CONNECTOR INSPECTION ). Go to  Step 9.

    Fig 10: Checking Auto-Cruise Control-ECU Connector C-21
    G04539393Courtesy of DAIMLERCHRYSLER CORPORATION
    Fig 11: Checking Data Link Connector C-26
    G04539394Courtesy of DAIMLERCHRYSLER CORPORATION
  8. STEP 8. Check the harness wire between auto-cruise control-ECU connector C-21 terminal 11 and data link connector C-26 terminal 13 for damage. 

    Q: Is the harness wire in good condition? 

    YES  : Check that the malfunction is eliminated. If the malfunction is eliminated, it can be assumed that this malfunction is intermittent. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS ). If the malfunction is not eliminated, replace the auto-cruise control-ECU (Refer to AUTO-CRUISE CONTROL  ), and then go to Step 9.

    NO:  Repair the damaged harness wire. Go to Step 9.

    Fig 12: Checking Harness Wire Between Auto-Cruise Control-ECU Connector C-21
    G04539395Courtesy of DAIMLERCHRYSLER CORPORATION
    Fig 13: Checking Data Link Connector C-26
    G04539396Courtesy of DAIMLERCHRYSLER CORPORATION
  9. STEP 9. Check that the malfunction is eliminated. 

    Q: Is the malfunction eliminated? 

    YES  : This procedure is complete.

    NO:  Go to  Step 1.

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