How to Use This Section
This section provides the following information:
• | General diagnosis information on transmissions |
• | Procedures for diagnosing the Hydra-matic transmission |
When you diagnose any condition of the Hydra-matic transmission, begin with A Diagnostic Starting Point. This procedure indicates the proper path of diagnosing the transmission by describing the basic checks. This procedure will then refer you to the locations
of specific checks. After you have determined the cause of a condition, refer to Repair Instructions for repair procedures. If the faulty component is not serviceable without removing the transmission from the vehicle, refer to OFF Vehicle repair
information.
Basic Knowledge
Notice: Do not, under any circumstances, attempt to diagnose a powertrain condition
without basic knowledge of this powertrain. If you perform diagnostic procedures
without this basic knowledge, you may incorrectly diagnose the condition
or damage the powertrain components.
You must be familiar with some basic electronics in order to use this section of the service manual. You should also be able to use the following special tools:
• | A digital multimeter (DMM) |
• | A line pressure gage set |
Diagnosis
Notice: If you probe a wire with a sharp instrument and do not properly seal
the wire afterward, the wire corrodes and an open circuit results.