The Diagnostic System Check provides the following information.
Begin the system diagnosis with:
| • | The identification of the control module or modules which commands the
system |
| • | The ability of the control module or modules to communicate through the
serial data circuit |
| • | The identification and status of stored diagnostic trouble codes (DTCs) |
The use of
Diagnostic System Check - Engine Controls
identifies the correct procedure for diagnosing the system
and the procedure location.
Symptoms
When it has been determined through the following procedures that no ECM DTCs
are present, begin the
Diagnostic System Check - Automatic Transmission
.
The Diagnostic System Check - Automatic Transmission is an organized approach
to identify a condition created by an automatic transmission. The Diagnostic System
check is the diagnostic starting point for an automatic transmission concern. The
Diagnostic System Check directs you to the next logical step for diagnosing a transmission
concern. Perform this check only if there is a driveability concern or if you have
been directed here from another service information section. Follow the table to help
reduce diagnostic time and help prevent unnecessary replacement of good parts. If
there are no TCM DTC's, begin symptom diagnosis by reviewing the
Transmission General Description
. Reviewing the Transmission General
Description information enables you to understand the operation of the system. This
helps you determine if the condition described by the customer is normal or if a malfunction
exists. If it is determined that a malfunction exists, identify the concern by referring
to
Symptoms - Automatic Transmission
.
