Related Tests, Information and Procedures

NOTE: Make sure the vehicle being tested has a fully charged battery. If it does not, false diagnostic codes or error messages may occur.

INTRODUCTION
These procedures include all the specifications, instructions, and graphics needed to diagnose powertrain control module (PCM) problems; they are: No Start, Diagnostic Trouble Code, and No Trouble Code problems for the PCM. The diagnostics are based on the trouble condition or symptom being present at the time of diagnosis.

When repairs are required, refer to the appropriate repair procedure.

Diagnostic procedures change every year. New diagnostic systems may be added; carryover systems may be enhanced. IT IS RECOMMENDED THAT YOU REVIEW THE ENTIRE SECTION TO BECOME FAMILIAR WITH ALL NEW AND CHANGED DIAGNOSTIC PROCEDURES.

These charts are designed to begin all diagnosis at the DTC TEST. This will cover all the necessary requirements to begin a logical diagnostic path for each problem. If there is a trouble code (DTC) detected, it will direct you to the trouble code test. If there are no trouble codes present, it will direct you by symptom to a no-trouble code test.

Six-Step Troubleshooting Procedure
Diagnosis of the powertrain control module (PCM) is done in six basic steps:
- verification of complaint
- verification of any related symptoms
- symptom analysis
- problem isolation
- repair of isolated problem
- verification of proper operation

Using the DRB (Chrysler Diagnostic Scan Tool)
Refer to the DRB user's guide for instructions and assistance with reading trouble codes, erasing trouble codes, and other DRB functions.

DRB Error Messages and Blank Screen
Under normal operation, the DRB will display one of only two error messages:
- User-Requested WARM Boot
- User-Requested COLD Boot

If the DRB should display any other error message, record the entire display and call the MDS Hotline, or call for information and assistance at 1-800-825-8737.

DRB Does Not Power Up
If the LED's do not light or no sound is emitted at start up, check for loose cable connections or a bad cable. Check the vehicle battery voltage (data link connector cavity 16). A minimum of 11 volts is required to adequately power the DRB.

If all connections are proper between the ORB and the vehicle or other devices, and the vehicle battery is fully charged, an inoperative DRB may be the result of faulty cable or vehicle wiring. For a blank screen, refer to DRB testing.

Display Is Not Visible
Low temperatures will affect the visibility of the display. Adjust the contrast to compensate for this condition.

DISCLAIMER
All information, illustrations, and specifications contained are based on the latest information available at the time of publication. The right is reserved to make changes at any time without notice.