Introduction

The procedures include all of the specifications, instructions, and graphics needed to diagnose the 1998 AW4 transmission. The diagnostics are based on the failure condition or symptom being present at the time of diagnosis.

Diagnostic procedures change every year. New diagnostic systems may be added: carryover systems may be enhanced. It is recommended that you become familiar with all new and changed diagnostic procedures.

The AW4 transmission control system was improved significantly last model year. Many new codes were added. The Park/Neutral switch was replaced by a Transmission Range Sensor (TRS). The Transmission Control Module (TCM) now has the ability to communicate with the Powertrain Control Module (PCM) via the CCD Bus. The TCM also has the ability to monitor transmission faults which could affect emissions. Any transmission fault which will adversely affect emissions will set a Diagnostic Trouble Code (DTC) in the PCM and will also illuminate the MIL.

For the 1998 Model Year, an Input Speed Sensor (ISS) has been added to the control system. This gives improved functional fault detection and better overall transmission control. It does not work in 4th gear. This results in a new Diagnostic. Trouble Code (DTC) to detect ISS malfunctions ($A8).

The "Solenoid #1 or TCC Solenoid Functional Fault" DTC ($EA) has been separated into two DTC's ($B2 and $B8) for the 1998 model year. There is also 1 new DTC for internal controller failures.

The Diagnostic procedures have been designed to be used in conjunction with Chrysler's DRBIII diagnostic tool.