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6E–257 ENGINE DRIVEABILITY AND EMISSIONS Diagnostic Trouble Code (DTC) P1618 Serial Peripheral Interface (SPI) PCM Interprocessor Communication Error Circuit Description The serial peripheral interface (SPI) communication is Conditions for Setting the DTC D Battery voltage is above 9.0 V for 2 seconds. D The PCM detects an internal program fault (check sum D Check sum fault present for 3 out 6 seconds. D No TCM resets for 2 seconds. Action Taken When the DTC Sets D The PCM will flash the “Check Trans” lamp the first D The PCM will store conditions which were present D The automatic transmission will operate in the “safety Conditions for Clearing the MIL/DTC D DTC P1618 can be cleared by using the Tech 2 “Clear DTC P1618 – Serial Peripheral Interface (SPI) PCM Interprocessor Communication Error
Step Action Value(s) Yes No 1 Was the “On-Board Diagnostic (OBD) System Check” — Go to Step 2 Go to OBD System Check 2 Is the EEPROM calibration the latest version — Go to Step 4 Go to Step 3 3 Reprogram the PCM with the latest available Does DTC 1618 re-appear when the OBD System Check is repeated? — Go to Step 4 Repair completed 4 Replace the PCM. IMPORTANT: The replacement PCM must be UBS 98model year Immobilizer Workshop Manual. Is the action complete? — Verify repair — |