For a vehicle with a TF A-604 Dodge Caravan transmission with a problem, this is a basic start to the proper method of making an accurate diagnosis on the problem with the transmission and whether you need a remanufactured transmission or a repair. Collecting the technical data and information first is where we start.
- Check the transmission fluid level. Low fluid levels can cause allot of problems, so be sure to top it off before making any diagnostic attempts. If the transmission is found to be low on fluid, be sure to check for leaks.
- Some DTC’s are difficult to reset. Read the general fault code information to determine how to reproduce the DTC that you are trying to diagnose. Make sure you have a ‘Hard’ code before proceeding with diagnostic testing. ‘Soft’ or intermittent DTC’s will require more intense diagnostic procedures.
- Check for the correct manual linkage or cable adjustment. Perform a ‘Shift Lever Test’ with a scan tool. If the test fails, perform tests for code P0706
- Check and repair all engine DTC’s before diagnosing transmission problems. Poor engine performance can cause transmission shift timing issues.
- Make sure that your battery is fully charged. If the battery isn’t fully charged, it could cause false readings in your diagnostic tests.
- IMPORTANT: Check all wiring connectors related to the circuit involved very closely. Look for broken, spread, or pushed-in terminals. Repair all wiring connectors as necessary.
- Check all CVIs and make sure they are within specifications.
- Check the version number of the Transmission Control Module (TCM). Some problems can be corrected by software upgrades to the TCM.
After this procedure is completed, the technician doing the diagnosis is prepared to make a recommendation on what may be in your best interests, get your transmission functioning again or whether to replace the old transmission with a rebuilt transmission.
