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Home >> Chrysler >> 2001 >> Sebring LX, 2D Convertible >> Repair and Diagnosis >> External Pages >> Different car >> Section 59 (Diagnosis - Automatic Transmission - Coupe) >> Automatic Transaxle Diagnosis >> Symptom Procedures >> INSPECTION PROCEDURE 16: Transaxle won't Downshift under Load with Auto-cruise Engaged. >> Diagnosis

INSPECTION PROCEDURE 16: Transaxle won't Downshift under Load with Auto-cruise Engaged.: 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. Using scan tool MB991502, check data list item 66: Overdrive Off Signal (Auto-cruise control-ECU Signal). 
    CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.
    1. Connect scan tool MB991502 to the data link connector.
    2. Start the engine and prepare to test drive the vehicle. (Operate the auto-cruise)
    3. Set scan tool MB991502 to data reading mode for item 66: Overdrive Off Signal (Auto-cruise control-ECU Signal).
      • When driving at level road, the display should be "OFF."
      • When driving at uphill road, the display should be "ON."
    4. Turn the ignition switch to the "LOCK" (OFF) position.

    Q: Is the sensor operating properly? 

    YES  : It can be assumed that this malfunction can be intermittent. Refer to HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS .

    NO:  Go to Step 2.

    Fig 1: Connecting Scan Tool To Data Link Connector
    G04542468Courtesy of CHRYSLER CORP.
  2. STEP 2. Check the auto-cruise system. 

    Check the auto-cruise system. Refer to AUTO-CRUISE CONTROL SYSTEM DIAGNOSTIC TROUBLESHOOTING STRATEGY .

    Q: Is the auto-cruise system operating properly? 

    YES  : Go to Step 3.

    NO:  Repair it, then check the symptom.

  3. STEP 3. Measure the signal voltage at PCM connector C-117 < 2.4L Engine > or C-119 < 3.0L Engine > by backprobing. 
    1. Do not disconnect connector C-117 < 2.4L Engine > or C-119 < 3.0L Engine >.
    2. Turn the ignition switch to the "ON" position.
      Fig 2: Locating PCM Connector Terminal C-117 And C-119
      G04542469Courtesy of CHRYSLER CORP.
    3. Measure the voltage between terminal 75 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 6.

    NO:  Go to Step 4.

    Fig 3: Measuring Voltage Between Terminal 75 And Ground By Backprobing
    G04542470Courtesy of CHRYSLER CORP.
  4. STEP 4. Check inter mediate connector C-25 and PCM connector C-117 < 2.4L Engine > or C-119 < 3.0L Engine > for looser, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Are the connectors and terminals in good condition? 

    YES  : Go to Step 5.

    NO:  Repair or replace the damaged components. Refer to HARNESS CONNECTOR INSPECTION .

    Fig 4: Identifying Intermediate Connector Terminal C-25
    G04542471Courtesy of CHRYSLER CORP.
    Fig 5: Locating PCM Connector Terminal C-117 And C-119
    G04542472Courtesy of CHRYSLER CORP.
  5. STEP 5. Check the harness for open circuit, short circuit to ground or damage between PCM connector C-117 < 2.4L Engine > or C-119 < 3.0L Engine > terminal 75 and auto-cruise control-ECU connector C-21 terminal 3. 

    Q: Is the harness wire in good condition? 

    YES  : Go to Step 6.

    NO:  Repair or replace the harness wire.

    Fig 6: Locating PCM Connector Terminal C-117 And C-119
    G04542473Courtesy of CHRYSLER CORP.
    Fig 7: Identifying Auto-Cruise Control-ECU Connector C-21 Terminal
    G04542474Courtesy of CHRYSLER CORP.
  6. STEP 6. Measure the signal voltage at auto-cruise control-ECU connector C-21 by backprobing. 
    1. Do not disconnect connector C-21.
    2. Turn the ignition switch to the "ON" position.
      Fig 8: Identifying Auto-Cruise Control-ECU Connector C-21 Terminal
      G04542475Courtesy of CHRYSLER CORP.
    3. Measure the voltage between terminal 3 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 7.

    NO:  Go to  Step 8.

    Fig 9: Measuring Voltage Between Terminal 3 And Ground By Backprobing
    G04542476Courtesy of CHRYSLER CORP.
  7. STEP 7. Check auto-cruise control-ECU connector C-21 at for looser, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Are the connector and terminals in good condition? 

    YES  : Go to  Step 10.

    NO:  Repair or replace the damaged components. Refer to HARNESS CONNECTOR INSPECTION .

    Fig 10: Identifying Auto-Cruise Control-ECU Connector C-21 Terminal
    G04542477Courtesy of CHRYSLER CORP.
  8. STEP 8. Check inter mediate connector C-25 and auto-cruise control-ECU connector C-21 for looser, corroded or damaged terminals, or terminals pushed back in the connector. 

    Q: Are the connectors and terminals in good condition? 

    YES  : Go to Step 9.

    NO:  Repair or replace the damaged components. Refer to HARNESS CONNECTOR INSPECTION .

    Fig 11: Identifying Intermediate Connector Terminal C-25
    G04542478Courtesy of CHRYSLER CORP.
    Fig 12: Identifying Auto-Cruise Control-ECU Connector Terminal C-21
    G04542479Courtesy of CHRYSLER CORP.
  9. STEP 9. Check harness for short circuit to ground between PCM connector C-117 < 2.4L Engine > or C-119 < 3.0L Engine > terminal 75 and auto-cruise control-ECU connector C-21 terminal 3. 

    Q: Is the harness wire in good condition? 

    YES  : Go to Step 10.

    NO:  Repair or replace the harness wire.

    Fig 13: Locating PCM Connector Terminal C-117 And C-119
    G04542480Courtesy of CHRYSLER CORP.
    Fig 14: Identifying Auto-Cruise Control-ECU Connector Terminal C-21
    G04542481Courtesy of CHRYSLER CORP.
  10. STEP 10. Using scan tool MB991502, check data list item 66: Overdrive Off Signal (Auto-cruise control-ECU Signal). 
    CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.
    1. Connect scan tool MB991502 to the data link connector.
    2. Start the engine and prepare to test drive the vehicle. (Operate the auto-cruise)
    3. Set scan tool MB991502 to data reading mode for item 66: Overdrive Off Signal (Auto-cruise control-ECU Signal).
      • When driving at level road, the display should be "OFF."
      • When driving at uphill road, the display should be "ON."
    4. Turn the ignition switch to the "LOCK" (OFF) position.

    Q: Is the sensor operating properly? 

    YES  : It can be assumed that this malfunction can be intermittent. Refer to HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS .

    NO:  Replace the PCM.

    Fig 15: Connecting Scan Tool To Data Link Connector
    G04542482Courtesy of CHRYSLER CORP.
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