DTC P1698: No Bus Message From Trans Control Module: Testing
- Turn ignition on. Using scan tool, clear DTCs. Cycle ignition on and off several times. Using scan tool, read DTCs. If DTC P1698 is displayed, go to next step. If DTC P1698 is not displayed, go to step 3 .
- Turn ignition on. Using scan tool, attempt to communicate with TCM. If communication can be established with TCM, replace PCM. If communication cannot be established with TCM, repair communication problem. See BODY CONTROL MODULES - CONCORDE, INTREPID, LHS & 300M article in ACCESSORIES & EQUIPMENT.
- Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition:
- With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set.
- Review freeze frame information on scan tool. Duplicate conditions present when DTC was set.
- Refer to any technical service bulletins that may apply.
- Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires.
- Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals.
If a problem is found, repair as necessary. If no problems are found, test is complete.