Important: The following steps must be completed before using the symptom diagnostic tables.
- Before using the symptom diagnostic tables, perform the
Diagnostic System Check - Vehicle
in order to verify the following conditions:
| • | There are not any DTCs set. |
| • | The control modules can communicate via the serial data link. |
- Review the system operation in order to understand the system functions. Refer to the following description and operations:
Visual/Physical Inspection
| • | Inspect for aftermarket devices which can affect the operation of the instrument panel cluster or the audible warnings system. Refer to
Checking Aftermarket Accessories
. |
| • | Inspect the accessible system components or the visible system components for obvious damage or for obvious conditions which can cause the symptom. |
| • | Inspect for the proper fluid levels. |
Intermittent
Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to
Testing for Intermittent Conditions and Poor Connections
.
Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:
Gages and Odometer
Indicators
| • | CHECK TRANS Indicator Malfunction |
| • | EXHAUST BRAKE Indicator Malfunction |
| • | Low Air Indicator Always On |
| • | Low Air Indicator Inoperative |
Audible Warnings
