Transmission Interface Fault
Numerous transmissions utilize the DDEC ECM to receive signals that are used to determine shift points, and/or other information.
Transmissions that currently utilize data links:
- J1587 - Allison World Transmissions
- J1939 Eaton, Allison
- J1922 Ceemat
- Advanced Interface
- ESS ™, Rockwell - Refer to ESS Troubleshooting Manual
- Top2, Eaton - Refer to MISC Output Troubleshooting
- PWM Signal Type - DDEC provides a PWM signal that is used by the transmission or its components
Verify Transmission Type
Perform the following steps to check the transmission type.
- Turn ignition ON.
- Plug in DDR.
- Check transmission origination.
- If a manual transmission, Allison hydraulic, Allison Electronic, Voith, ZF, refer to "10.15.3 Review PWM #1 Signal" .
- If a J1939/autoshift, Allison WT, Rockwell RXX-X, refer to the troubleshooting manual of the transmission manufacturer to troubleshoot the fault.
- If the transmission type does not match the transmission correctly, reprogram and refer to "10.15.4 Verify Repairs" .
Review PWM #1 Signal
Perform the following steps to check the DDR for codes.
- Perform road test with assistant.
- Plug in DDR.
- Watch PWM #1 signal.
- If the PWM varies with the load changes, and the ECM is programmed as Allison® Electric, Voith or ZF, the signal is normal. Review the wiring or transmission.
- If the PWM signal is 0% or 100% when the signal is programmed for Allison Hydraulic with load changes, the program is normal. Review the transmission, wiring or relay. Refer to "10.15.4 Verify Repairs" .
Perform the following steps to verify repairs. Start with the Menu Selection. An assistant is needed for the following procedure.
- Perform road test.
- If the problem is resolved, troubleshooting is complete.
- If the problem still exists, contact the OEM or transmission supplier. The steps that led you here do not indicate a problem with the PWM #2 output or output wire. Verify the correct configuration. Refer to the DDEC Application and Installation manual, 7SA800, for the appropriate engine.
|DDEC III/IV Single ECM Troubleshooting Guide - 6SE497|
|Generated on 10-13-2008|