MPC5676 ECU Bench Pinout (Bench / Boot / GPT Mode) — Connection Diagram

Step-by-step bench connection diagram for the MPC5676 ECU (Platform Bench, no case opening, and Boot Mode): T30/T15 power pinout, CAN-H/CAN-L twisted pair and GPT0/GPT1 signals.

OEM PINOUT DIAGRAM: ACDelco E84 MPC5676.png (Platform / Bench)784,874 bytes

OEM PINOUT DIAGRAM: AcDelco E80 MPC5676.png (Platform / Bench)952,513 bytes

OEM PINOUT DIAGRAM: BOOT_ACDelco E84 MPC5676.png (Boot)2,145,513 bytes

OEM PINOUT DIAGRAM: BOOT_AcDelco E80 MPC5676.png (Boot)2,376,909 bytes

STEP-BY-STEP BENCH CONNECTION PROTOCOL (HOWTO)BENCH / BOOT

Step 1 (Terminal 30 & Terminal 15 power): Apply stabilized 13.5V — 13.8V to the permanent power (T30) and ignition (T15) pins, plus ground (GND), following the cable color coding above.
Step 2 (CAN bus & GPT0 / GPT1 generator lines): Connect the CAN-H and CAN-L, plus the signal wires GPT0 (S1) and GPT1 (S2) to enter service mode without opening the ECU case.
Step 3 (Full PFLASH + DFLASH backup read): Before any write operation, read and save a full backup of the internal flash (PFLASH) and the EEPROM area (DFLASH).