The Transaxle Control Module (TCM) monitors transaxle operation along with input and output information. If TCM self-diagnostic system senses a transaxle or electrical circuit failure, a Diagnostic Trouble Code (DTC) will be stored in TCM memory. If malfunction goes away after DTC is stored in TCM memory, TCM will erase DTC after ignition has been cycled at least 75 times. DTCs are classified as either hard or intermittent codes.
Any DTC that returns within 3 ignition cycles is called a hard code. Hard code indicates that failure exists every time TCM checks the system.
An intermittent code is a DTC that occurs intermittently and is most likely caused by defective wiring or connections. Intermittent code indicates that failure does not exist every time TCM checks the system. Intermittent codes must be checked under conditions in which they would be set.
NOTE:A reset counter, located on Chrysler's Diagnostic Readout Box (DRB) scan tool, indicates number of engine starts since DTC was set. This aids in determining if DTC is a hard or intermittent code. If reset counter shows less than 3 engine starts, it indicates a hard code. If reset counter shows 3 or more engine starts, an intermittent code exists.
CAUTION:Shift Lever Status must be performed prior to repairing DTCs. See TEST 2A.
When performing vehicle diagnosis, ensure the following:
Battery is fully charged.
Transaxle fluid level is correct and not contaminated or aerated.
Shift cable or linkage is properly adjusted.
All electrical connections at transaxle switches/sensors, TCM, solenoid assembly, transaxle control relay and back-up light relays are clean and properly installed.
Repair DTCs in the order displayed.
Always perform VERIFICATION TEST VER-1A after repair is completed.
NOTE:Self-diagnostic tests are written specifically for Chrysler's Diagnostic Readout Box (DRB) scan tool. A generic scan tool may be used, but may not be capable of performing all necessary test functions.
TEST EQUIPMENT HOOK-UP
Generic Scan Tool & DVOM
Self-diagnostic tests are written specifically for Chrysler's Diagnostic Readout Box (DRB) scan tool. The DRB has a built-in DVOM function. A generic scan tool may be used, but may not be capable of performing all necessary test functions. If DRB test procedures require resistance or voltage to be measured using scan tool in ohmmeter or voltmeter mode, perform the following:
Connect DVOM ground lead to DLC connector terminal No. 4 and positive lead to terminal specified in test procedure.
DRB Scan Tool
Refer to DRB scan tool instructions to read and clear DTCs, and when performing other scan tool functions. DRB scan tool is grounded through DLC connector terminal No. 4. Only one volt/ohmmeter test lead is required to measure voltage or resistance. DRB scan tool volt/ohmmeter mode should only be used when specified by test procedure.
RETRIEVING DIAGNOSTIC TROUBLE CODES
NOTE:Manufacturer recommends using Chrysler's Diagnostic Readout Box (DRB) scan tool with appropriate cartridge for system diagnosis. Other after-market scan tools may be used for system diagnosis. Following procedure is for DRB scan tool usage. Use manufacturer's instruction for operating scan tool.
Ensure ignition is off. Connect DRB to data link connector located under driver's side of instrument panel. Perform TEST 1A, ENTERING 41TE/AE DIAGNOSTIC TEST under DIAGNOSTIC TESTS.
A CCD bus test is performed. If an error message appears on scan tool, follow manufacturer's instructions. Retrieve DTCs using scan tool manufacturer's instructions. Note DTC display and reset counter display.
Reset counter indicates number of engine starts since trouble code was set. This helps determine if a hard or intermittent DTC exists.
If reset counter shows less than 3 engine starts, it indicates a hard code. If reset counter shows 3 or more engine starts, an intermittent code exists.
Using scan tool, display all Diagnostic Trouble Codes (DTCs). To identify DTC, See Fig. 12. When some DTCs are set, transaxle will enter limp-in mode until failure is repaired. During limp-in mode, Park, Neutral, Reverse and 2nd gear functions, but transaxle cannot upshift or downshift. Vehicle can be operated, but transaxle performance will be reduced.
Monday, September 13th, 2010 AT 4:18 AM