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TRANSMISSION CONTROL SYSTEM (4L30–E) 7A1–65 DTC P1790/Flashing Code 85 ROM Transmission Side Bad Check Sum Circuit Description Transmission Side Read Only Memory (ROM) and Conditions For Setting The DTC D Detects check sum error for 1 second. Action Taken When The DTC Sets D Maximum line pressure. D Immediate landing to 4th gear. D Inhibit TCC engagement. D The PCM will illuminate the CHECK TRANS Lamp. Conditions For Clearing The DTC/CHECK D The PCM will turn off the CHECK TRANS Lamp after D The DTC can be cleared from the PCM history by D The DTC will be cleared from history when the vehicle D The PCM will cancel the DTC default actions when DTC P1790/Flashing Code 85 ROM Transmission Side Bad Check Sum Step Action Yes No 1 1. Install the scan tool. NOTE: Before clearing DTC(s), use the scan tool to record “Failure 3. Record the DTC “Failure Records”. Was DTC P1790 set? Go to Step 4 Go to Step 2 2 Was DTC P1792 set? Go to Step 3 — 3 1. Remove the PCM. Refer to Powertrain Control Module (PCM) in Automatic Transmission (4L30–E) section. 2. Using the ITCS reprogram the transmission EEPROM. Was the reprogramming complete? Go to Step 5 — 4 Replace the PCM. Is the replacement complete? Go to Step 5 — 5 1. After the repair is complete, use the scan tool to select “DTC”, then “Clear Info” function and operate the vehicle. 2. Review the scan tool “DTC Info”. Has the last test failed or is the current DTC displayed? Begin diagnosis again Go to Step 1 Repair verified |